3866 lines
119 KiB
C++
3866 lines
119 KiB
C++
/* Forward propagation of expressions for single use variables.
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Copyright (C) 2004-2022 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "backend.h"
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#include "rtl.h"
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#include "tree.h"
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#include "gimple.h"
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#include "cfghooks.h"
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#include "tree-pass.h"
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#include "ssa.h"
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#include "expmed.h"
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#include "optabs-query.h"
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#include "gimple-pretty-print.h"
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#include "fold-const.h"
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#include "stor-layout.h"
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#include "gimple-fold.h"
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#include "tree-eh.h"
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#include "gimplify.h"
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#include "gimple-iterator.h"
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#include "gimplify-me.h"
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#include "tree-cfg.h"
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#include "expr.h"
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#include "tree-dfa.h"
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#include "tree-ssa-propagate.h"
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#include "tree-ssa-dom.h"
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#include "builtins.h"
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#include "tree-cfgcleanup.h"
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#include "cfganal.h"
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#include "optabs-tree.h"
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#include "tree-vector-builder.h"
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#include "vec-perm-indices.h"
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#include "internal-fn.h"
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#include "cgraph.h"
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#include "tree-ssa.h"
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/* This pass propagates the RHS of assignment statements into use
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sites of the LHS of the assignment. It's basically a specialized
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form of tree combination. It is hoped all of this can disappear
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when we have a generalized tree combiner.
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One class of common cases we handle is forward propagating a single use
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variable into a COND_EXPR.
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bb0:
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x = a COND b;
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if (x) goto ... else goto ...
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Will be transformed into:
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bb0:
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if (a COND b) goto ... else goto ...
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Similarly for the tests (x == 0), (x != 0), (x == 1) and (x != 1).
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Or (assuming c1 and c2 are constants):
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bb0:
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x = a + c1;
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if (x EQ/NEQ c2) goto ... else goto ...
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Will be transformed into:
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bb0:
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if (a EQ/NEQ (c2 - c1)) goto ... else goto ...
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Similarly for x = a - c1.
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Or
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bb0:
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x = !a
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if (x) goto ... else goto ...
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Will be transformed into:
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bb0:
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if (a == 0) goto ... else goto ...
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Similarly for the tests (x == 0), (x != 0), (x == 1) and (x != 1).
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For these cases, we propagate A into all, possibly more than one,
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COND_EXPRs that use X.
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Or
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bb0:
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x = (typecast) a
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if (x) goto ... else goto ...
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Will be transformed into:
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bb0:
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if (a != 0) goto ... else goto ...
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(Assuming a is an integral type and x is a boolean or x is an
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integral and a is a boolean.)
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Similarly for the tests (x == 0), (x != 0), (x == 1) and (x != 1).
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For these cases, we propagate A into all, possibly more than one,
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COND_EXPRs that use X.
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In addition to eliminating the variable and the statement which assigns
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a value to the variable, we may be able to later thread the jump without
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adding insane complexity in the dominator optimizer.
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Also note these transformations can cascade. We handle this by having
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a worklist of COND_EXPR statements to examine. As we make a change to
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a statement, we put it back on the worklist to examine on the next
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iteration of the main loop.
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A second class of propagation opportunities arises for ADDR_EXPR
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nodes.
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ptr = &x->y->z;
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res = *ptr;
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Will get turned into
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res = x->y->z;
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Or
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ptr = (type1*)&type2var;
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res = *ptr
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Will get turned into (if type1 and type2 are the same size
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and neither have volatile on them):
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res = VIEW_CONVERT_EXPR<type1>(type2var)
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Or
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ptr = &x[0];
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ptr2 = ptr + <constant>;
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Will get turned into
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ptr2 = &x[constant/elementsize];
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Or
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ptr = &x[0];
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offset = index * element_size;
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offset_p = (pointer) offset;
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ptr2 = ptr + offset_p
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Will get turned into:
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ptr2 = &x[index];
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Or
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ssa = (int) decl
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res = ssa & 1
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Provided that decl has known alignment >= 2, will get turned into
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res = 0
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We also propagate casts into SWITCH_EXPR and COND_EXPR conditions to
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allow us to remove the cast and {NOT_EXPR,NEG_EXPR} into a subsequent
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{NOT_EXPR,NEG_EXPR}.
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This will (of course) be extended as other needs arise. */
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static bool forward_propagate_addr_expr (tree, tree, bool);
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/* Set to true if we delete dead edges during the optimization. */
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static bool cfg_changed;
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static tree rhs_to_tree (tree type, gimple *stmt);
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static bitmap to_purge;
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/* Const-and-copy lattice. */
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static vec<tree> lattice;
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/* Set the lattice entry for NAME to VAL. */
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static void
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fwprop_set_lattice_val (tree name, tree val)
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{
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if (TREE_CODE (name) == SSA_NAME)
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{
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if (SSA_NAME_VERSION (name) >= lattice.length ())
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{
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lattice.reserve (num_ssa_names - lattice.length ());
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lattice.quick_grow_cleared (num_ssa_names);
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}
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lattice[SSA_NAME_VERSION (name)] = val;
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}
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}
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/* Invalidate the lattice entry for NAME, done when releasing SSA names. */
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static void
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fwprop_invalidate_lattice (tree name)
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{
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if (name
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&& TREE_CODE (name) == SSA_NAME
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&& SSA_NAME_VERSION (name) < lattice.length ())
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lattice[SSA_NAME_VERSION (name)] = NULL_TREE;
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}
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/* Get the statement we can propagate from into NAME skipping
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trivial copies. Returns the statement which defines the
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propagation source or NULL_TREE if there is no such one.
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If SINGLE_USE_ONLY is set considers only sources which have
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a single use chain up to NAME. If SINGLE_USE_P is non-null,
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it is set to whether the chain to NAME is a single use chain
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or not. SINGLE_USE_P is not written to if SINGLE_USE_ONLY is set. */
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static gimple *
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get_prop_source_stmt (tree name, bool single_use_only, bool *single_use_p)
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{
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bool single_use = true;
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do {
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gimple *def_stmt = SSA_NAME_DEF_STMT (name);
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if (!has_single_use (name))
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{
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single_use = false;
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if (single_use_only)
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return NULL;
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}
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/* If name is defined by a PHI node or is the default def, bail out. */
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if (!is_gimple_assign (def_stmt))
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return NULL;
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/* If def_stmt is a simple copy, continue looking. */
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if (gimple_assign_rhs_code (def_stmt) == SSA_NAME)
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name = gimple_assign_rhs1 (def_stmt);
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else
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{
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if (!single_use_only && single_use_p)
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*single_use_p = single_use;
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return def_stmt;
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}
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} while (1);
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}
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/* Checks if the destination ssa name in DEF_STMT can be used as
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propagation source. Returns true if so, otherwise false. */
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static bool
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can_propagate_from (gimple *def_stmt)
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{
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gcc_assert (is_gimple_assign (def_stmt));
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/* If the rhs has side-effects we cannot propagate from it. */
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if (gimple_has_volatile_ops (def_stmt))
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return false;
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/* If the rhs is a load we cannot propagate from it. */
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if (TREE_CODE_CLASS (gimple_assign_rhs_code (def_stmt)) == tcc_reference
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|| TREE_CODE_CLASS (gimple_assign_rhs_code (def_stmt)) == tcc_declaration)
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return false;
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/* Constants can be always propagated. */
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if (gimple_assign_single_p (def_stmt)
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&& is_gimple_min_invariant (gimple_assign_rhs1 (def_stmt)))
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return true;
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/* We cannot propagate ssa names that occur in abnormal phi nodes. */
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if (stmt_references_abnormal_ssa_name (def_stmt))
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return false;
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/* If the definition is a conversion of a pointer to a function type,
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then we cannot apply optimizations as some targets require
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function pointers to be canonicalized and in this case this
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optimization could eliminate a necessary canonicalization. */
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if (CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (def_stmt)))
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{
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tree rhs = gimple_assign_rhs1 (def_stmt);
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if (POINTER_TYPE_P (TREE_TYPE (rhs))
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&& TREE_CODE (TREE_TYPE (TREE_TYPE (rhs))) == FUNCTION_TYPE)
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return false;
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}
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return true;
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}
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/* Remove a chain of dead statements starting at the definition of
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NAME. The chain is linked via the first operand of the defining statements.
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If NAME was replaced in its only use then this function can be used
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to clean up dead stmts. The function handles already released SSA
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names gracefully.
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Returns true if cleanup-cfg has to run. */
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static bool
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remove_prop_source_from_use (tree name)
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{
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gimple_stmt_iterator gsi;
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gimple *stmt;
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bool cfg_changed = false;
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do {
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basic_block bb;
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if (SSA_NAME_IN_FREE_LIST (name)
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|| SSA_NAME_IS_DEFAULT_DEF (name)
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|| !has_zero_uses (name))
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return cfg_changed;
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stmt = SSA_NAME_DEF_STMT (name);
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if (gimple_code (stmt) == GIMPLE_PHI
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|| gimple_has_side_effects (stmt))
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return cfg_changed;
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bb = gimple_bb (stmt);
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gsi = gsi_for_stmt (stmt);
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unlink_stmt_vdef (stmt);
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if (gsi_remove (&gsi, true))
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bitmap_set_bit (to_purge, bb->index);
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fwprop_invalidate_lattice (gimple_get_lhs (stmt));
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release_defs (stmt);
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name = is_gimple_assign (stmt) ? gimple_assign_rhs1 (stmt) : NULL_TREE;
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} while (name && TREE_CODE (name) == SSA_NAME);
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return cfg_changed;
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}
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/* Return the rhs of a gassign *STMT in a form of a single tree,
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converted to type TYPE.
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This should disappear, but is needed so we can combine expressions and use
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the fold() interfaces. Long term, we need to develop folding and combine
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routines that deal with gimple exclusively . */
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static tree
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rhs_to_tree (tree type, gimple *stmt)
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{
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location_t loc = gimple_location (stmt);
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enum tree_code code = gimple_assign_rhs_code (stmt);
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switch (get_gimple_rhs_class (code))
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{
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case GIMPLE_TERNARY_RHS:
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return fold_build3_loc (loc, code, type, gimple_assign_rhs1 (stmt),
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gimple_assign_rhs2 (stmt),
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gimple_assign_rhs3 (stmt));
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case GIMPLE_BINARY_RHS:
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return fold_build2_loc (loc, code, type, gimple_assign_rhs1 (stmt),
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gimple_assign_rhs2 (stmt));
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case GIMPLE_UNARY_RHS:
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return build1 (code, type, gimple_assign_rhs1 (stmt));
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case GIMPLE_SINGLE_RHS:
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return gimple_assign_rhs1 (stmt);
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default:
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gcc_unreachable ();
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}
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}
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/* Combine OP0 CODE OP1 in the context of a COND_EXPR. Returns
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the folded result in a form suitable for COND_EXPR_COND or
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NULL_TREE, if there is no suitable simplified form. If
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INVARIANT_ONLY is true only gimple_min_invariant results are
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considered simplified. */
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static tree
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combine_cond_expr_cond (gimple *stmt, enum tree_code code, tree type,
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tree op0, tree op1, bool invariant_only)
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{
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tree t;
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gcc_assert (TREE_CODE_CLASS (code) == tcc_comparison);
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fold_defer_overflow_warnings ();
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t = fold_binary_loc (gimple_location (stmt), code, type, op0, op1);
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if (!t)
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{
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fold_undefer_overflow_warnings (false, NULL, 0);
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return NULL_TREE;
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}
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/* Require that we got a boolean type out if we put one in. */
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gcc_assert (TREE_CODE (TREE_TYPE (t)) == TREE_CODE (type));
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/* Canonicalize the combined condition for use in a COND_EXPR. */
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t = canonicalize_cond_expr_cond (t);
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/* Bail out if we required an invariant but didn't get one. */
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if (!t || (invariant_only && !is_gimple_min_invariant (t)))
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{
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fold_undefer_overflow_warnings (false, NULL, 0);
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return NULL_TREE;
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}
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bool nowarn = warning_suppressed_p (stmt, OPT_Wstrict_overflow);
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fold_undefer_overflow_warnings (!nowarn, stmt, 0);
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return t;
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}
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/* Combine the comparison OP0 CODE OP1 at LOC with the defining statements
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of its operand. Return a new comparison tree or NULL_TREE if there
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were no simplifying combines. */
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static tree
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forward_propagate_into_comparison_1 (gimple *stmt,
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enum tree_code code, tree type,
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tree op0, tree op1)
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{
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tree tmp = NULL_TREE;
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tree rhs0 = NULL_TREE, rhs1 = NULL_TREE;
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bool single_use0_p = false, single_use1_p = false;
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/* For comparisons use the first operand, that is likely to
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simplify comparisons against constants. */
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if (TREE_CODE (op0) == SSA_NAME)
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{
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gimple *def_stmt = get_prop_source_stmt (op0, false, &single_use0_p);
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if (def_stmt && can_propagate_from (def_stmt))
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{
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enum tree_code def_code = gimple_assign_rhs_code (def_stmt);
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bool invariant_only_p = !single_use0_p;
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rhs0 = rhs_to_tree (TREE_TYPE (op1), def_stmt);
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/* Always combine comparisons or conversions from booleans. */
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if (TREE_CODE (op1) == INTEGER_CST
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&& ((CONVERT_EXPR_CODE_P (def_code)
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&& TREE_CODE (TREE_TYPE (TREE_OPERAND (rhs0, 0)))
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== BOOLEAN_TYPE)
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|| TREE_CODE_CLASS (def_code) == tcc_comparison))
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invariant_only_p = false;
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tmp = combine_cond_expr_cond (stmt, code, type,
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rhs0, op1, invariant_only_p);
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if (tmp)
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return tmp;
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}
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}
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/* If that wasn't successful, try the second operand. */
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if (TREE_CODE (op1) == SSA_NAME)
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{
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gimple *def_stmt = get_prop_source_stmt (op1, false, &single_use1_p);
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if (def_stmt && can_propagate_from (def_stmt))
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{
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rhs1 = rhs_to_tree (TREE_TYPE (op0), def_stmt);
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tmp = combine_cond_expr_cond (stmt, code, type,
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op0, rhs1, !single_use1_p);
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if (tmp)
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return tmp;
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}
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}
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/* If that wasn't successful either, try both operands. */
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if (rhs0 != NULL_TREE
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&& rhs1 != NULL_TREE)
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tmp = combine_cond_expr_cond (stmt, code, type,
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rhs0, rhs1,
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!(single_use0_p && single_use1_p));
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return tmp;
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}
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/* Propagate from the ssa name definition statements of the assignment
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from a comparison at *GSI into the conditional if that simplifies it.
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Returns 1 if the stmt was modified and 2 if the CFG needs cleanup,
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otherwise returns 0. */
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static int
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forward_propagate_into_comparison (gimple_stmt_iterator *gsi)
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{
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gimple *stmt = gsi_stmt (*gsi);
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tree tmp;
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bool cfg_changed = false;
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tree type = TREE_TYPE (gimple_assign_lhs (stmt));
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tree rhs1 = gimple_assign_rhs1 (stmt);
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tree rhs2 = gimple_assign_rhs2 (stmt);
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/* Combine the comparison with defining statements. */
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tmp = forward_propagate_into_comparison_1 (stmt,
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gimple_assign_rhs_code (stmt),
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type, rhs1, rhs2);
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if (tmp && useless_type_conversion_p (type, TREE_TYPE (tmp)))
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{
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gimple_assign_set_rhs_from_tree (gsi, tmp);
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fold_stmt (gsi);
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update_stmt (gsi_stmt (*gsi));
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if (TREE_CODE (rhs1) == SSA_NAME)
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cfg_changed |= remove_prop_source_from_use (rhs1);
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if (TREE_CODE (rhs2) == SSA_NAME)
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cfg_changed |= remove_prop_source_from_use (rhs2);
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return cfg_changed ? 2 : 1;
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}
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return 0;
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}
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/* Propagate from the ssa name definition statements of COND_EXPR
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in GIMPLE_COND statement STMT into the conditional if that simplifies it.
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Returns zero if no statement was changed, one if there were
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changes and two if cfg_cleanup needs to run.
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|
|
This must be kept in sync with forward_propagate_into_cond. */
|
|
|
|
static int
|
|
forward_propagate_into_gimple_cond (gcond *stmt)
|
|
{
|
|
tree tmp;
|
|
enum tree_code code = gimple_cond_code (stmt);
|
|
bool cfg_changed = false;
|
|
tree rhs1 = gimple_cond_lhs (stmt);
|
|
tree rhs2 = gimple_cond_rhs (stmt);
|
|
|
|
/* We can do tree combining on SSA_NAME and comparison expressions. */
|
|
if (TREE_CODE_CLASS (gimple_cond_code (stmt)) != tcc_comparison)
|
|
return 0;
|
|
|
|
tmp = forward_propagate_into_comparison_1 (stmt, code,
|
|
boolean_type_node,
|
|
rhs1, rhs2);
|
|
if (tmp
|
|
&& is_gimple_condexpr_for_cond (tmp))
|
|
{
|
|
if (dump_file)
|
|
{
|
|
fprintf (dump_file, " Replaced '");
|
|
print_gimple_expr (dump_file, stmt, 0);
|
|
fprintf (dump_file, "' with '");
|
|
print_generic_expr (dump_file, tmp);
|
|
fprintf (dump_file, "'\n");
|
|
}
|
|
|
|
gimple_cond_set_condition_from_tree (stmt, unshare_expr (tmp));
|
|
update_stmt (stmt);
|
|
|
|
if (TREE_CODE (rhs1) == SSA_NAME)
|
|
cfg_changed |= remove_prop_source_from_use (rhs1);
|
|
if (TREE_CODE (rhs2) == SSA_NAME)
|
|
cfg_changed |= remove_prop_source_from_use (rhs2);
|
|
return (cfg_changed || is_gimple_min_invariant (tmp)) ? 2 : 1;
|
|
}
|
|
|
|
/* Canonicalize _Bool == 0 and _Bool != 1 to _Bool != 0 by swapping edges. */
|
|
if ((TREE_CODE (TREE_TYPE (rhs1)) == BOOLEAN_TYPE
|
|
|| (INTEGRAL_TYPE_P (TREE_TYPE (rhs1))
|
|
&& TYPE_PRECISION (TREE_TYPE (rhs1)) == 1))
|
|
&& ((code == EQ_EXPR
|
|
&& integer_zerop (rhs2))
|
|
|| (code == NE_EXPR
|
|
&& integer_onep (rhs2))))
|
|
{
|
|
basic_block bb = gimple_bb (stmt);
|
|
gimple_cond_set_code (stmt, NE_EXPR);
|
|
gimple_cond_set_rhs (stmt, build_zero_cst (TREE_TYPE (rhs1)));
|
|
EDGE_SUCC (bb, 0)->flags ^= (EDGE_TRUE_VALUE|EDGE_FALSE_VALUE);
|
|
EDGE_SUCC (bb, 1)->flags ^= (EDGE_TRUE_VALUE|EDGE_FALSE_VALUE);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Propagate from the ssa name definition statements of COND_EXPR
|
|
in the rhs of statement STMT into the conditional if that simplifies it.
|
|
Returns true zero if the stmt was changed. */
|
|
|
|
static bool
|
|
forward_propagate_into_cond (gimple_stmt_iterator *gsi_p)
|
|
{
|
|
gimple *stmt = gsi_stmt (*gsi_p);
|
|
tree tmp = NULL_TREE;
|
|
tree cond = gimple_assign_rhs1 (stmt);
|
|
enum tree_code code = gimple_assign_rhs_code (stmt);
|
|
|
|
/* We can do tree combining on SSA_NAME and comparison expressions. */
|
|
if (COMPARISON_CLASS_P (cond))
|
|
tmp = forward_propagate_into_comparison_1 (stmt, TREE_CODE (cond),
|
|
TREE_TYPE (cond),
|
|
TREE_OPERAND (cond, 0),
|
|
TREE_OPERAND (cond, 1));
|
|
else if (TREE_CODE (cond) == SSA_NAME)
|
|
{
|
|
enum tree_code def_code;
|
|
tree name = cond;
|
|
gimple *def_stmt = get_prop_source_stmt (name, true, NULL);
|
|
if (!def_stmt || !can_propagate_from (def_stmt))
|
|
return 0;
|
|
|
|
def_code = gimple_assign_rhs_code (def_stmt);
|
|
if (TREE_CODE_CLASS (def_code) == tcc_comparison)
|
|
tmp = fold_build2_loc (gimple_location (def_stmt),
|
|
def_code,
|
|
TREE_TYPE (cond),
|
|
gimple_assign_rhs1 (def_stmt),
|
|
gimple_assign_rhs2 (def_stmt));
|
|
}
|
|
|
|
if (tmp
|
|
&& is_gimple_condexpr (tmp))
|
|
{
|
|
if (dump_file)
|
|
{
|
|
fprintf (dump_file, " Replaced '");
|
|
print_generic_expr (dump_file, cond);
|
|
fprintf (dump_file, "' with '");
|
|
print_generic_expr (dump_file, tmp);
|
|
fprintf (dump_file, "'\n");
|
|
}
|
|
|
|
if ((code == VEC_COND_EXPR) ? integer_all_onesp (tmp)
|
|
: integer_onep (tmp))
|
|
gimple_assign_set_rhs_from_tree (gsi_p, gimple_assign_rhs2 (stmt));
|
|
else if (integer_zerop (tmp))
|
|
gimple_assign_set_rhs_from_tree (gsi_p, gimple_assign_rhs3 (stmt));
|
|
else
|
|
gimple_assign_set_rhs1 (stmt, unshare_expr (tmp));
|
|
stmt = gsi_stmt (*gsi_p);
|
|
update_stmt (stmt);
|
|
|
|
return true;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* We've just substituted an ADDR_EXPR into stmt. Update all the
|
|
relevant data structures to match. */
|
|
|
|
static void
|
|
tidy_after_forward_propagate_addr (gimple *stmt)
|
|
{
|
|
/* We may have turned a trapping insn into a non-trapping insn. */
|
|
if (maybe_clean_or_replace_eh_stmt (stmt, stmt))
|
|
bitmap_set_bit (to_purge, gimple_bb (stmt)->index);
|
|
|
|
if (TREE_CODE (gimple_assign_rhs1 (stmt)) == ADDR_EXPR)
|
|
recompute_tree_invariant_for_addr_expr (gimple_assign_rhs1 (stmt));
|
|
}
|
|
|
|
/* NAME is a SSA_NAME representing DEF_RHS which is of the form
|
|
ADDR_EXPR <whatever>.
|
|
|
|
Try to forward propagate the ADDR_EXPR into the use USE_STMT.
|
|
Often this will allow for removal of an ADDR_EXPR and INDIRECT_REF
|
|
node or for recovery of array indexing from pointer arithmetic.
|
|
|
|
Return true if the propagation was successful (the propagation can
|
|
be not totally successful, yet things may have been changed). */
|
|
|
|
static bool
|
|
forward_propagate_addr_expr_1 (tree name, tree def_rhs,
|
|
gimple_stmt_iterator *use_stmt_gsi,
|
|
bool single_use_p)
|
|
{
|
|
tree lhs, rhs, rhs2, array_ref;
|
|
gimple *use_stmt = gsi_stmt (*use_stmt_gsi);
|
|
enum tree_code rhs_code;
|
|
bool res = true;
|
|
|
|
gcc_assert (TREE_CODE (def_rhs) == ADDR_EXPR);
|
|
|
|
lhs = gimple_assign_lhs (use_stmt);
|
|
rhs_code = gimple_assign_rhs_code (use_stmt);
|
|
rhs = gimple_assign_rhs1 (use_stmt);
|
|
|
|
/* Do not perform copy-propagation but recurse through copy chains. */
|
|
if (TREE_CODE (lhs) == SSA_NAME
|
|
&& rhs_code == SSA_NAME)
|
|
return forward_propagate_addr_expr (lhs, def_rhs, single_use_p);
|
|
|
|
/* The use statement could be a conversion. Recurse to the uses of the
|
|
lhs as copyprop does not copy through pointer to integer to pointer
|
|
conversions and FRE does not catch all cases either.
|
|
Treat the case of a single-use name and
|
|
a conversion to def_rhs type separate, though. */
|
|
if (TREE_CODE (lhs) == SSA_NAME
|
|
&& CONVERT_EXPR_CODE_P (rhs_code))
|
|
{
|
|
/* If there is a point in a conversion chain where the types match
|
|
so we can remove a conversion re-materialize the address here
|
|
and stop. */
|
|
if (single_use_p
|
|
&& useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (def_rhs)))
|
|
{
|
|
gimple_assign_set_rhs1 (use_stmt, unshare_expr (def_rhs));
|
|
gimple_assign_set_rhs_code (use_stmt, TREE_CODE (def_rhs));
|
|
return true;
|
|
}
|
|
|
|
/* Else recurse if the conversion preserves the address value. */
|
|
if ((INTEGRAL_TYPE_P (TREE_TYPE (lhs))
|
|
|| POINTER_TYPE_P (TREE_TYPE (lhs)))
|
|
&& (TYPE_PRECISION (TREE_TYPE (lhs))
|
|
>= TYPE_PRECISION (TREE_TYPE (def_rhs))))
|
|
return forward_propagate_addr_expr (lhs, def_rhs, single_use_p);
|
|
|
|
return false;
|
|
}
|
|
|
|
/* If this isn't a conversion chain from this on we only can propagate
|
|
into compatible pointer contexts. */
|
|
if (!types_compatible_p (TREE_TYPE (name), TREE_TYPE (def_rhs)))
|
|
return false;
|
|
|
|
/* Propagate through constant pointer adjustments. */
|
|
if (TREE_CODE (lhs) == SSA_NAME
|
|
&& rhs_code == POINTER_PLUS_EXPR
|
|
&& rhs == name
|
|
&& TREE_CODE (gimple_assign_rhs2 (use_stmt)) == INTEGER_CST)
|
|
{
|
|
tree new_def_rhs;
|
|
/* As we come here with non-invariant addresses in def_rhs we need
|
|
to make sure we can build a valid constant offsetted address
|
|
for further propagation. Simply rely on fold building that
|
|
and check after the fact. */
|
|
new_def_rhs = fold_build2 (MEM_REF, TREE_TYPE (TREE_TYPE (rhs)),
|
|
def_rhs,
|
|
fold_convert (ptr_type_node,
|
|
gimple_assign_rhs2 (use_stmt)));
|
|
if (TREE_CODE (new_def_rhs) == MEM_REF
|
|
&& !is_gimple_mem_ref_addr (TREE_OPERAND (new_def_rhs, 0)))
|
|
return false;
|
|
new_def_rhs = build1 (ADDR_EXPR, TREE_TYPE (rhs), new_def_rhs);
|
|
|
|
/* Recurse. If we could propagate into all uses of lhs do not
|
|
bother to replace into the current use but just pretend we did. */
|
|
if (forward_propagate_addr_expr (lhs, new_def_rhs, single_use_p))
|
|
return true;
|
|
|
|
if (useless_type_conversion_p (TREE_TYPE (lhs),
|
|
TREE_TYPE (new_def_rhs)))
|
|
gimple_assign_set_rhs_with_ops (use_stmt_gsi, TREE_CODE (new_def_rhs),
|
|
new_def_rhs);
|
|
else if (is_gimple_min_invariant (new_def_rhs))
|
|
gimple_assign_set_rhs_with_ops (use_stmt_gsi, NOP_EXPR, new_def_rhs);
|
|
else
|
|
return false;
|
|
gcc_assert (gsi_stmt (*use_stmt_gsi) == use_stmt);
|
|
update_stmt (use_stmt);
|
|
return true;
|
|
}
|
|
|
|
/* Now strip away any outer COMPONENT_REF/ARRAY_REF nodes from the LHS.
|
|
ADDR_EXPR will not appear on the LHS. */
|
|
tree *lhsp = gimple_assign_lhs_ptr (use_stmt);
|
|
while (handled_component_p (*lhsp))
|
|
lhsp = &TREE_OPERAND (*lhsp, 0);
|
|
lhs = *lhsp;
|
|
|
|
/* Now see if the LHS node is a MEM_REF using NAME. If so,
|
|
propagate the ADDR_EXPR into the use of NAME and fold the result. */
|
|
if (TREE_CODE (lhs) == MEM_REF
|
|
&& TREE_OPERAND (lhs, 0) == name)
|
|
{
|
|
tree def_rhs_base;
|
|
poly_int64 def_rhs_offset;
|
|
/* If the address is invariant we can always fold it. */
|
|
if ((def_rhs_base = get_addr_base_and_unit_offset (TREE_OPERAND (def_rhs, 0),
|
|
&def_rhs_offset)))
|
|
{
|
|
poly_offset_int off = mem_ref_offset (lhs);
|
|
tree new_ptr;
|
|
off += def_rhs_offset;
|
|
if (TREE_CODE (def_rhs_base) == MEM_REF)
|
|
{
|
|
off += mem_ref_offset (def_rhs_base);
|
|
new_ptr = TREE_OPERAND (def_rhs_base, 0);
|
|
}
|
|
else
|
|
new_ptr = build_fold_addr_expr (def_rhs_base);
|
|
TREE_OPERAND (lhs, 0) = new_ptr;
|
|
TREE_OPERAND (lhs, 1)
|
|
= wide_int_to_tree (TREE_TYPE (TREE_OPERAND (lhs, 1)), off);
|
|
tidy_after_forward_propagate_addr (use_stmt);
|
|
/* Continue propagating into the RHS if this was not the only use. */
|
|
if (single_use_p)
|
|
return true;
|
|
}
|
|
/* If the LHS is a plain dereference and the value type is the same as
|
|
that of the pointed-to type of the address we can put the
|
|
dereferenced address on the LHS preserving the original alias-type. */
|
|
else if (integer_zerop (TREE_OPERAND (lhs, 1))
|
|
&& ((gimple_assign_lhs (use_stmt) == lhs
|
|
&& useless_type_conversion_p
|
|
(TREE_TYPE (TREE_OPERAND (def_rhs, 0)),
|
|
TREE_TYPE (gimple_assign_rhs1 (use_stmt))))
|
|
|| types_compatible_p (TREE_TYPE (lhs),
|
|
TREE_TYPE (TREE_OPERAND (def_rhs, 0))))
|
|
/* Don't forward anything into clobber stmts if it would result
|
|
in the lhs no longer being a MEM_REF. */
|
|
&& (!gimple_clobber_p (use_stmt)
|
|
|| TREE_CODE (TREE_OPERAND (def_rhs, 0)) == MEM_REF))
|
|
{
|
|
tree *def_rhs_basep = &TREE_OPERAND (def_rhs, 0);
|
|
tree new_offset, new_base, saved, new_lhs;
|
|
while (handled_component_p (*def_rhs_basep))
|
|
def_rhs_basep = &TREE_OPERAND (*def_rhs_basep, 0);
|
|
saved = *def_rhs_basep;
|
|
if (TREE_CODE (*def_rhs_basep) == MEM_REF)
|
|
{
|
|
new_base = TREE_OPERAND (*def_rhs_basep, 0);
|
|
new_offset = fold_convert (TREE_TYPE (TREE_OPERAND (lhs, 1)),
|
|
TREE_OPERAND (*def_rhs_basep, 1));
|
|
}
|
|
else
|
|
{
|
|
new_base = build_fold_addr_expr (*def_rhs_basep);
|
|
new_offset = TREE_OPERAND (lhs, 1);
|
|
}
|
|
*def_rhs_basep = build2 (MEM_REF, TREE_TYPE (*def_rhs_basep),
|
|
new_base, new_offset);
|
|
TREE_THIS_VOLATILE (*def_rhs_basep) = TREE_THIS_VOLATILE (lhs);
|
|
TREE_SIDE_EFFECTS (*def_rhs_basep) = TREE_SIDE_EFFECTS (lhs);
|
|
TREE_THIS_NOTRAP (*def_rhs_basep) = TREE_THIS_NOTRAP (lhs);
|
|
new_lhs = unshare_expr (TREE_OPERAND (def_rhs, 0));
|
|
*lhsp = new_lhs;
|
|
TREE_THIS_VOLATILE (new_lhs) = TREE_THIS_VOLATILE (lhs);
|
|
TREE_SIDE_EFFECTS (new_lhs) = TREE_SIDE_EFFECTS (lhs);
|
|
*def_rhs_basep = saved;
|
|
tidy_after_forward_propagate_addr (use_stmt);
|
|
/* Continue propagating into the RHS if this was not the
|
|
only use. */
|
|
if (single_use_p)
|
|
return true;
|
|
}
|
|
else
|
|
/* We can have a struct assignment dereferencing our name twice.
|
|
Note that we didn't propagate into the lhs to not falsely
|
|
claim we did when propagating into the rhs. */
|
|
res = false;
|
|
}
|
|
|
|
/* Strip away any outer COMPONENT_REF, ARRAY_REF or ADDR_EXPR
|
|
nodes from the RHS. */
|
|
tree *rhsp = gimple_assign_rhs1_ptr (use_stmt);
|
|
if (TREE_CODE (*rhsp) == ADDR_EXPR)
|
|
rhsp = &TREE_OPERAND (*rhsp, 0);
|
|
while (handled_component_p (*rhsp))
|
|
rhsp = &TREE_OPERAND (*rhsp, 0);
|
|
rhs = *rhsp;
|
|
|
|
/* Now see if the RHS node is a MEM_REF using NAME. If so,
|
|
propagate the ADDR_EXPR into the use of NAME and fold the result. */
|
|
if (TREE_CODE (rhs) == MEM_REF
|
|
&& TREE_OPERAND (rhs, 0) == name)
|
|
{
|
|
tree def_rhs_base;
|
|
poly_int64 def_rhs_offset;
|
|
if ((def_rhs_base = get_addr_base_and_unit_offset (TREE_OPERAND (def_rhs, 0),
|
|
&def_rhs_offset)))
|
|
{
|
|
poly_offset_int off = mem_ref_offset (rhs);
|
|
tree new_ptr;
|
|
off += def_rhs_offset;
|
|
if (TREE_CODE (def_rhs_base) == MEM_REF)
|
|
{
|
|
off += mem_ref_offset (def_rhs_base);
|
|
new_ptr = TREE_OPERAND (def_rhs_base, 0);
|
|
}
|
|
else
|
|
new_ptr = build_fold_addr_expr (def_rhs_base);
|
|
TREE_OPERAND (rhs, 0) = new_ptr;
|
|
TREE_OPERAND (rhs, 1)
|
|
= wide_int_to_tree (TREE_TYPE (TREE_OPERAND (rhs, 1)), off);
|
|
fold_stmt_inplace (use_stmt_gsi);
|
|
tidy_after_forward_propagate_addr (use_stmt);
|
|
return res;
|
|
}
|
|
/* If the RHS is a plain dereference and the value type is the same as
|
|
that of the pointed-to type of the address we can put the
|
|
dereferenced address on the RHS preserving the original alias-type. */
|
|
else if (integer_zerop (TREE_OPERAND (rhs, 1))
|
|
&& ((gimple_assign_rhs1 (use_stmt) == rhs
|
|
&& useless_type_conversion_p
|
|
(TREE_TYPE (gimple_assign_lhs (use_stmt)),
|
|
TREE_TYPE (TREE_OPERAND (def_rhs, 0))))
|
|
|| types_compatible_p (TREE_TYPE (rhs),
|
|
TREE_TYPE (TREE_OPERAND (def_rhs, 0)))))
|
|
{
|
|
tree *def_rhs_basep = &TREE_OPERAND (def_rhs, 0);
|
|
tree new_offset, new_base, saved, new_rhs;
|
|
while (handled_component_p (*def_rhs_basep))
|
|
def_rhs_basep = &TREE_OPERAND (*def_rhs_basep, 0);
|
|
saved = *def_rhs_basep;
|
|
if (TREE_CODE (*def_rhs_basep) == MEM_REF)
|
|
{
|
|
new_base = TREE_OPERAND (*def_rhs_basep, 0);
|
|
new_offset = fold_convert (TREE_TYPE (TREE_OPERAND (rhs, 1)),
|
|
TREE_OPERAND (*def_rhs_basep, 1));
|
|
}
|
|
else
|
|
{
|
|
new_base = build_fold_addr_expr (*def_rhs_basep);
|
|
new_offset = TREE_OPERAND (rhs, 1);
|
|
}
|
|
*def_rhs_basep = build2 (MEM_REF, TREE_TYPE (*def_rhs_basep),
|
|
new_base, new_offset);
|
|
TREE_THIS_VOLATILE (*def_rhs_basep) = TREE_THIS_VOLATILE (rhs);
|
|
TREE_SIDE_EFFECTS (*def_rhs_basep) = TREE_SIDE_EFFECTS (rhs);
|
|
TREE_THIS_NOTRAP (*def_rhs_basep) = TREE_THIS_NOTRAP (rhs);
|
|
new_rhs = unshare_expr (TREE_OPERAND (def_rhs, 0));
|
|
*rhsp = new_rhs;
|
|
TREE_THIS_VOLATILE (new_rhs) = TREE_THIS_VOLATILE (rhs);
|
|
TREE_SIDE_EFFECTS (new_rhs) = TREE_SIDE_EFFECTS (rhs);
|
|
*def_rhs_basep = saved;
|
|
fold_stmt_inplace (use_stmt_gsi);
|
|
tidy_after_forward_propagate_addr (use_stmt);
|
|
return res;
|
|
}
|
|
}
|
|
|
|
/* If the use of the ADDR_EXPR is not a POINTER_PLUS_EXPR, there
|
|
is nothing to do. */
|
|
if (gimple_assign_rhs_code (use_stmt) != POINTER_PLUS_EXPR
|
|
|| gimple_assign_rhs1 (use_stmt) != name)
|
|
return false;
|
|
|
|
/* The remaining cases are all for turning pointer arithmetic into
|
|
array indexing. They only apply when we have the address of
|
|
element zero in an array. If that is not the case then there
|
|
is nothing to do. */
|
|
array_ref = TREE_OPERAND (def_rhs, 0);
|
|
if ((TREE_CODE (array_ref) != ARRAY_REF
|
|
|| TREE_CODE (TREE_TYPE (TREE_OPERAND (array_ref, 0))) != ARRAY_TYPE
|
|
|| TREE_CODE (TREE_OPERAND (array_ref, 1)) != INTEGER_CST)
|
|
&& TREE_CODE (TREE_TYPE (array_ref)) != ARRAY_TYPE)
|
|
return false;
|
|
|
|
rhs2 = gimple_assign_rhs2 (use_stmt);
|
|
/* Optimize &x[C1] p+ C2 to &x p+ C3 with C3 = C1 * element_size + C2. */
|
|
if (TREE_CODE (rhs2) == INTEGER_CST)
|
|
{
|
|
tree new_rhs = build1_loc (gimple_location (use_stmt),
|
|
ADDR_EXPR, TREE_TYPE (def_rhs),
|
|
fold_build2 (MEM_REF,
|
|
TREE_TYPE (TREE_TYPE (def_rhs)),
|
|
unshare_expr (def_rhs),
|
|
fold_convert (ptr_type_node,
|
|
rhs2)));
|
|
gimple_assign_set_rhs_from_tree (use_stmt_gsi, new_rhs);
|
|
use_stmt = gsi_stmt (*use_stmt_gsi);
|
|
update_stmt (use_stmt);
|
|
tidy_after_forward_propagate_addr (use_stmt);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* STMT is a statement of the form SSA_NAME = ADDR_EXPR <whatever>.
|
|
|
|
Try to forward propagate the ADDR_EXPR into all uses of the SSA_NAME.
|
|
Often this will allow for removal of an ADDR_EXPR and INDIRECT_REF
|
|
node or for recovery of array indexing from pointer arithmetic.
|
|
|
|
PARENT_SINGLE_USE_P tells if, when in a recursive invocation, NAME was
|
|
the single use in the previous invocation. Pass true when calling
|
|
this as toplevel.
|
|
|
|
Returns true, if all uses have been propagated into. */
|
|
|
|
static bool
|
|
forward_propagate_addr_expr (tree name, tree rhs, bool parent_single_use_p)
|
|
{
|
|
imm_use_iterator iter;
|
|
gimple *use_stmt;
|
|
bool all = true;
|
|
bool single_use_p = parent_single_use_p && has_single_use (name);
|
|
|
|
FOR_EACH_IMM_USE_STMT (use_stmt, iter, name)
|
|
{
|
|
bool result;
|
|
tree use_rhs;
|
|
|
|
/* If the use is not in a simple assignment statement, then
|
|
there is nothing we can do. */
|
|
if (!is_gimple_assign (use_stmt))
|
|
{
|
|
if (!is_gimple_debug (use_stmt))
|
|
all = false;
|
|
continue;
|
|
}
|
|
|
|
gimple_stmt_iterator gsi = gsi_for_stmt (use_stmt);
|
|
result = forward_propagate_addr_expr_1 (name, rhs, &gsi,
|
|
single_use_p);
|
|
/* If the use has moved to a different statement adjust
|
|
the update machinery for the old statement too. */
|
|
if (use_stmt != gsi_stmt (gsi))
|
|
{
|
|
update_stmt (use_stmt);
|
|
use_stmt = gsi_stmt (gsi);
|
|
}
|
|
update_stmt (use_stmt);
|
|
all &= result;
|
|
|
|
/* Remove intermediate now unused copy and conversion chains. */
|
|
use_rhs = gimple_assign_rhs1 (use_stmt);
|
|
if (result
|
|
&& TREE_CODE (gimple_assign_lhs (use_stmt)) == SSA_NAME
|
|
&& TREE_CODE (use_rhs) == SSA_NAME
|
|
&& has_zero_uses (gimple_assign_lhs (use_stmt)))
|
|
{
|
|
gimple_stmt_iterator gsi = gsi_for_stmt (use_stmt);
|
|
fwprop_invalidate_lattice (gimple_get_lhs (use_stmt));
|
|
release_defs (use_stmt);
|
|
gsi_remove (&gsi, true);
|
|
}
|
|
}
|
|
|
|
return all && has_zero_uses (name);
|
|
}
|
|
|
|
|
|
/* Helper function for simplify_gimple_switch. Remove case labels that
|
|
have values outside the range of the new type. */
|
|
|
|
static void
|
|
simplify_gimple_switch_label_vec (gswitch *stmt, tree index_type)
|
|
{
|
|
unsigned int branch_num = gimple_switch_num_labels (stmt);
|
|
auto_vec<tree> labels (branch_num);
|
|
unsigned int i, len;
|
|
|
|
/* Collect the existing case labels in a VEC, and preprocess it as if
|
|
we are gimplifying a GENERIC SWITCH_EXPR. */
|
|
for (i = 1; i < branch_num; i++)
|
|
labels.quick_push (gimple_switch_label (stmt, i));
|
|
preprocess_case_label_vec_for_gimple (labels, index_type, NULL);
|
|
|
|
/* If any labels were removed, replace the existing case labels
|
|
in the GIMPLE_SWITCH statement with the correct ones.
|
|
Note that the type updates were done in-place on the case labels,
|
|
so we only have to replace the case labels in the GIMPLE_SWITCH
|
|
if the number of labels changed. */
|
|
len = labels.length ();
|
|
if (len < branch_num - 1)
|
|
{
|
|
bitmap target_blocks;
|
|
edge_iterator ei;
|
|
edge e;
|
|
|
|
/* Corner case: *all* case labels have been removed as being
|
|
out-of-range for INDEX_TYPE. Push one label and let the
|
|
CFG cleanups deal with this further. */
|
|
if (len == 0)
|
|
{
|
|
tree label, elt;
|
|
|
|
label = CASE_LABEL (gimple_switch_default_label (stmt));
|
|
elt = build_case_label (build_int_cst (index_type, 0), NULL, label);
|
|
labels.quick_push (elt);
|
|
len = 1;
|
|
}
|
|
|
|
for (i = 0; i < labels.length (); i++)
|
|
gimple_switch_set_label (stmt, i + 1, labels[i]);
|
|
for (i++ ; i < branch_num; i++)
|
|
gimple_switch_set_label (stmt, i, NULL_TREE);
|
|
gimple_switch_set_num_labels (stmt, len + 1);
|
|
|
|
/* Cleanup any edges that are now dead. */
|
|
target_blocks = BITMAP_ALLOC (NULL);
|
|
for (i = 0; i < gimple_switch_num_labels (stmt); i++)
|
|
{
|
|
tree elt = gimple_switch_label (stmt, i);
|
|
basic_block target = label_to_block (cfun, CASE_LABEL (elt));
|
|
bitmap_set_bit (target_blocks, target->index);
|
|
}
|
|
for (ei = ei_start (gimple_bb (stmt)->succs); (e = ei_safe_edge (ei)); )
|
|
{
|
|
if (! bitmap_bit_p (target_blocks, e->dest->index))
|
|
{
|
|
remove_edge (e);
|
|
cfg_changed = true;
|
|
free_dominance_info (CDI_DOMINATORS);
|
|
}
|
|
else
|
|
ei_next (&ei);
|
|
}
|
|
BITMAP_FREE (target_blocks);
|
|
}
|
|
}
|
|
|
|
/* STMT is a SWITCH_EXPR for which we attempt to find equivalent forms of
|
|
the condition which we may be able to optimize better. */
|
|
|
|
static bool
|
|
simplify_gimple_switch (gswitch *stmt)
|
|
{
|
|
/* The optimization that we really care about is removing unnecessary
|
|
casts. That will let us do much better in propagating the inferred
|
|
constant at the switch target. */
|
|
tree cond = gimple_switch_index (stmt);
|
|
if (TREE_CODE (cond) == SSA_NAME)
|
|
{
|
|
gimple *def_stmt = SSA_NAME_DEF_STMT (cond);
|
|
if (gimple_assign_cast_p (def_stmt))
|
|
{
|
|
tree def = gimple_assign_rhs1 (def_stmt);
|
|
if (TREE_CODE (def) != SSA_NAME)
|
|
return false;
|
|
|
|
/* If we have an extension or sign-change that preserves the
|
|
values we check against then we can copy the source value into
|
|
the switch. */
|
|
tree ti = TREE_TYPE (def);
|
|
if (INTEGRAL_TYPE_P (ti)
|
|
&& TYPE_PRECISION (ti) <= TYPE_PRECISION (TREE_TYPE (cond)))
|
|
{
|
|
size_t n = gimple_switch_num_labels (stmt);
|
|
tree min = NULL_TREE, max = NULL_TREE;
|
|
if (n > 1)
|
|
{
|
|
min = CASE_LOW (gimple_switch_label (stmt, 1));
|
|
if (CASE_HIGH (gimple_switch_label (stmt, n - 1)))
|
|
max = CASE_HIGH (gimple_switch_label (stmt, n - 1));
|
|
else
|
|
max = CASE_LOW (gimple_switch_label (stmt, n - 1));
|
|
}
|
|
if ((!min || int_fits_type_p (min, ti))
|
|
&& (!max || int_fits_type_p (max, ti)))
|
|
{
|
|
gimple_switch_set_index (stmt, def);
|
|
simplify_gimple_switch_label_vec (stmt, ti);
|
|
update_stmt (stmt);
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* For pointers p2 and p1 return p2 - p1 if the
|
|
difference is known and constant, otherwise return NULL. */
|
|
|
|
static tree
|
|
constant_pointer_difference (tree p1, tree p2)
|
|
{
|
|
int i, j;
|
|
#define CPD_ITERATIONS 5
|
|
tree exps[2][CPD_ITERATIONS];
|
|
tree offs[2][CPD_ITERATIONS];
|
|
int cnt[2];
|
|
|
|
for (i = 0; i < 2; i++)
|
|
{
|
|
tree p = i ? p1 : p2;
|
|
tree off = size_zero_node;
|
|
gimple *stmt;
|
|
enum tree_code code;
|
|
|
|
/* For each of p1 and p2 we need to iterate at least
|
|
twice, to handle ADDR_EXPR directly in p1/p2,
|
|
SSA_NAME with ADDR_EXPR or POINTER_PLUS_EXPR etc.
|
|
on definition's stmt RHS. Iterate a few extra times. */
|
|
j = 0;
|
|
do
|
|
{
|
|
if (!POINTER_TYPE_P (TREE_TYPE (p)))
|
|
break;
|
|
if (TREE_CODE (p) == ADDR_EXPR)
|
|
{
|
|
tree q = TREE_OPERAND (p, 0);
|
|
poly_int64 offset;
|
|
tree base = get_addr_base_and_unit_offset (q, &offset);
|
|
if (base)
|
|
{
|
|
q = base;
|
|
if (maybe_ne (offset, 0))
|
|
off = size_binop (PLUS_EXPR, off, size_int (offset));
|
|
}
|
|
if (TREE_CODE (q) == MEM_REF
|
|
&& TREE_CODE (TREE_OPERAND (q, 0)) == SSA_NAME)
|
|
{
|
|
p = TREE_OPERAND (q, 0);
|
|
off = size_binop (PLUS_EXPR, off,
|
|
wide_int_to_tree (sizetype,
|
|
mem_ref_offset (q)));
|
|
}
|
|
else
|
|
{
|
|
exps[i][j] = q;
|
|
offs[i][j++] = off;
|
|
break;
|
|
}
|
|
}
|
|
if (TREE_CODE (p) != SSA_NAME)
|
|
break;
|
|
exps[i][j] = p;
|
|
offs[i][j++] = off;
|
|
if (j == CPD_ITERATIONS)
|
|
break;
|
|
stmt = SSA_NAME_DEF_STMT (p);
|
|
if (!is_gimple_assign (stmt) || gimple_assign_lhs (stmt) != p)
|
|
break;
|
|
code = gimple_assign_rhs_code (stmt);
|
|
if (code == POINTER_PLUS_EXPR)
|
|
{
|
|
if (TREE_CODE (gimple_assign_rhs2 (stmt)) != INTEGER_CST)
|
|
break;
|
|
off = size_binop (PLUS_EXPR, off, gimple_assign_rhs2 (stmt));
|
|
p = gimple_assign_rhs1 (stmt);
|
|
}
|
|
else if (code == ADDR_EXPR || CONVERT_EXPR_CODE_P (code))
|
|
p = gimple_assign_rhs1 (stmt);
|
|
else
|
|
break;
|
|
}
|
|
while (1);
|
|
cnt[i] = j;
|
|
}
|
|
|
|
for (i = 0; i < cnt[0]; i++)
|
|
for (j = 0; j < cnt[1]; j++)
|
|
if (exps[0][i] == exps[1][j])
|
|
return size_binop (MINUS_EXPR, offs[0][i], offs[1][j]);
|
|
|
|
return NULL_TREE;
|
|
}
|
|
|
|
/* *GSI_P is a GIMPLE_CALL to a builtin function.
|
|
Optimize
|
|
memcpy (p, "abcd", 4);
|
|
memset (p + 4, ' ', 3);
|
|
into
|
|
memcpy (p, "abcd ", 7);
|
|
call if the latter can be stored by pieces during expansion.
|
|
|
|
Also canonicalize __atomic_fetch_op (p, x, y) op x
|
|
to __atomic_op_fetch (p, x, y) or
|
|
__atomic_op_fetch (p, x, y) iop x
|
|
to __atomic_fetch_op (p, x, y) when possible (also __sync). */
|
|
|
|
static bool
|
|
simplify_builtin_call (gimple_stmt_iterator *gsi_p, tree callee2)
|
|
{
|
|
gimple *stmt1, *stmt2 = gsi_stmt (*gsi_p);
|
|
enum built_in_function other_atomic = END_BUILTINS;
|
|
enum tree_code atomic_op = ERROR_MARK;
|
|
tree vuse = gimple_vuse (stmt2);
|
|
if (vuse == NULL)
|
|
return false;
|
|
stmt1 = SSA_NAME_DEF_STMT (vuse);
|
|
|
|
switch (DECL_FUNCTION_CODE (callee2))
|
|
{
|
|
case BUILT_IN_MEMSET:
|
|
if (gimple_call_num_args (stmt2) != 3
|
|
|| gimple_call_lhs (stmt2)
|
|
|| CHAR_BIT != 8
|
|
|| BITS_PER_UNIT != 8)
|
|
break;
|
|
else
|
|
{
|
|
tree callee1;
|
|
tree ptr1, src1, str1, off1, len1, lhs1;
|
|
tree ptr2 = gimple_call_arg (stmt2, 0);
|
|
tree val2 = gimple_call_arg (stmt2, 1);
|
|
tree len2 = gimple_call_arg (stmt2, 2);
|
|
tree diff, vdef, new_str_cst;
|
|
gimple *use_stmt;
|
|
unsigned int ptr1_align;
|
|
unsigned HOST_WIDE_INT src_len;
|
|
char *src_buf;
|
|
use_operand_p use_p;
|
|
|
|
if (!tree_fits_shwi_p (val2)
|
|
|| !tree_fits_uhwi_p (len2)
|
|
|| compare_tree_int (len2, 1024) == 1)
|
|
break;
|
|
if (is_gimple_call (stmt1))
|
|
{
|
|
/* If first stmt is a call, it needs to be memcpy
|
|
or mempcpy, with string literal as second argument and
|
|
constant length. */
|
|
callee1 = gimple_call_fndecl (stmt1);
|
|
if (callee1 == NULL_TREE
|
|
|| !fndecl_built_in_p (callee1, BUILT_IN_NORMAL)
|
|
|| gimple_call_num_args (stmt1) != 3)
|
|
break;
|
|
if (DECL_FUNCTION_CODE (callee1) != BUILT_IN_MEMCPY
|
|
&& DECL_FUNCTION_CODE (callee1) != BUILT_IN_MEMPCPY)
|
|
break;
|
|
ptr1 = gimple_call_arg (stmt1, 0);
|
|
src1 = gimple_call_arg (stmt1, 1);
|
|
len1 = gimple_call_arg (stmt1, 2);
|
|
lhs1 = gimple_call_lhs (stmt1);
|
|
if (!tree_fits_uhwi_p (len1))
|
|
break;
|
|
str1 = string_constant (src1, &off1, NULL, NULL);
|
|
if (str1 == NULL_TREE)
|
|
break;
|
|
if (!tree_fits_uhwi_p (off1)
|
|
|| compare_tree_int (off1, TREE_STRING_LENGTH (str1) - 1) > 0
|
|
|| compare_tree_int (len1, TREE_STRING_LENGTH (str1)
|
|
- tree_to_uhwi (off1)) > 0
|
|
|| TREE_CODE (TREE_TYPE (str1)) != ARRAY_TYPE
|
|
|| TYPE_MODE (TREE_TYPE (TREE_TYPE (str1)))
|
|
!= TYPE_MODE (char_type_node))
|
|
break;
|
|
}
|
|
else if (gimple_assign_single_p (stmt1))
|
|
{
|
|
/* Otherwise look for length 1 memcpy optimized into
|
|
assignment. */
|
|
ptr1 = gimple_assign_lhs (stmt1);
|
|
src1 = gimple_assign_rhs1 (stmt1);
|
|
if (TREE_CODE (ptr1) != MEM_REF
|
|
|| TYPE_MODE (TREE_TYPE (ptr1)) != TYPE_MODE (char_type_node)
|
|
|| !tree_fits_shwi_p (src1))
|
|
break;
|
|
ptr1 = build_fold_addr_expr (ptr1);
|
|
STRIP_USELESS_TYPE_CONVERSION (ptr1);
|
|
callee1 = NULL_TREE;
|
|
len1 = size_one_node;
|
|
lhs1 = NULL_TREE;
|
|
off1 = size_zero_node;
|
|
str1 = NULL_TREE;
|
|
}
|
|
else
|
|
break;
|
|
|
|
diff = constant_pointer_difference (ptr1, ptr2);
|
|
if (diff == NULL && lhs1 != NULL)
|
|
{
|
|
diff = constant_pointer_difference (lhs1, ptr2);
|
|
if (DECL_FUNCTION_CODE (callee1) == BUILT_IN_MEMPCPY
|
|
&& diff != NULL)
|
|
diff = size_binop (PLUS_EXPR, diff,
|
|
fold_convert (sizetype, len1));
|
|
}
|
|
/* If the difference between the second and first destination pointer
|
|
is not constant, or is bigger than memcpy length, bail out. */
|
|
if (diff == NULL
|
|
|| !tree_fits_uhwi_p (diff)
|
|
|| tree_int_cst_lt (len1, diff)
|
|
|| compare_tree_int (diff, 1024) == 1)
|
|
break;
|
|
|
|
/* Use maximum of difference plus memset length and memcpy length
|
|
as the new memcpy length, if it is too big, bail out. */
|
|
src_len = tree_to_uhwi (diff);
|
|
src_len += tree_to_uhwi (len2);
|
|
if (src_len < tree_to_uhwi (len1))
|
|
src_len = tree_to_uhwi (len1);
|
|
if (src_len > 1024)
|
|
break;
|
|
|
|
/* If mempcpy value is used elsewhere, bail out, as mempcpy
|
|
with bigger length will return different result. */
|
|
if (lhs1 != NULL_TREE
|
|
&& DECL_FUNCTION_CODE (callee1) == BUILT_IN_MEMPCPY
|
|
&& (TREE_CODE (lhs1) != SSA_NAME
|
|
|| !single_imm_use (lhs1, &use_p, &use_stmt)
|
|
|| use_stmt != stmt2))
|
|
break;
|
|
|
|
/* If anything reads memory in between memcpy and memset
|
|
call, the modified memcpy call might change it. */
|
|
vdef = gimple_vdef (stmt1);
|
|
if (vdef != NULL
|
|
&& (!single_imm_use (vdef, &use_p, &use_stmt)
|
|
|| use_stmt != stmt2))
|
|
break;
|
|
|
|
ptr1_align = get_pointer_alignment (ptr1);
|
|
/* Construct the new source string literal. */
|
|
src_buf = XALLOCAVEC (char, src_len + 1);
|
|
if (callee1)
|
|
memcpy (src_buf,
|
|
TREE_STRING_POINTER (str1) + tree_to_uhwi (off1),
|
|
tree_to_uhwi (len1));
|
|
else
|
|
src_buf[0] = tree_to_shwi (src1);
|
|
memset (src_buf + tree_to_uhwi (diff),
|
|
tree_to_shwi (val2), tree_to_uhwi (len2));
|
|
src_buf[src_len] = '\0';
|
|
/* Neither builtin_strncpy_read_str nor builtin_memcpy_read_str
|
|
handle embedded '\0's. */
|
|
if (strlen (src_buf) != src_len)
|
|
break;
|
|
rtl_profile_for_bb (gimple_bb (stmt2));
|
|
/* If the new memcpy wouldn't be emitted by storing the literal
|
|
by pieces, this optimization might enlarge .rodata too much,
|
|
as commonly used string literals couldn't be shared any
|
|
longer. */
|
|
if (!can_store_by_pieces (src_len,
|
|
builtin_strncpy_read_str,
|
|
src_buf, ptr1_align, false))
|
|
break;
|
|
|
|
new_str_cst = build_string_literal (src_len, src_buf);
|
|
if (callee1)
|
|
{
|
|
/* If STMT1 is a mem{,p}cpy call, adjust it and remove
|
|
memset call. */
|
|
if (lhs1 && DECL_FUNCTION_CODE (callee1) == BUILT_IN_MEMPCPY)
|
|
gimple_call_set_lhs (stmt1, NULL_TREE);
|
|
gimple_call_set_arg (stmt1, 1, new_str_cst);
|
|
gimple_call_set_arg (stmt1, 2,
|
|
build_int_cst (TREE_TYPE (len1), src_len));
|
|
update_stmt (stmt1);
|
|
unlink_stmt_vdef (stmt2);
|
|
gsi_replace (gsi_p, gimple_build_nop (), false);
|
|
fwprop_invalidate_lattice (gimple_get_lhs (stmt2));
|
|
release_defs (stmt2);
|
|
if (lhs1 && DECL_FUNCTION_CODE (callee1) == BUILT_IN_MEMPCPY)
|
|
{
|
|
fwprop_invalidate_lattice (lhs1);
|
|
release_ssa_name (lhs1);
|
|
}
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
/* Otherwise, if STMT1 is length 1 memcpy optimized into
|
|
assignment, remove STMT1 and change memset call into
|
|
memcpy call. */
|
|
gimple_stmt_iterator gsi = gsi_for_stmt (stmt1);
|
|
|
|
if (!is_gimple_val (ptr1))
|
|
ptr1 = force_gimple_operand_gsi (gsi_p, ptr1, true, NULL_TREE,
|
|
true, GSI_SAME_STMT);
|
|
tree fndecl = builtin_decl_explicit (BUILT_IN_MEMCPY);
|
|
gimple_call_set_fndecl (stmt2, fndecl);
|
|
gimple_call_set_fntype (as_a <gcall *> (stmt2),
|
|
TREE_TYPE (fndecl));
|
|
gimple_call_set_arg (stmt2, 0, ptr1);
|
|
gimple_call_set_arg (stmt2, 1, new_str_cst);
|
|
gimple_call_set_arg (stmt2, 2,
|
|
build_int_cst (TREE_TYPE (len2), src_len));
|
|
unlink_stmt_vdef (stmt1);
|
|
gsi_remove (&gsi, true);
|
|
fwprop_invalidate_lattice (gimple_get_lhs (stmt1));
|
|
release_defs (stmt1);
|
|
update_stmt (stmt2);
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
#define CASE_ATOMIC(NAME, OTHER, OP) \
|
|
case BUILT_IN_##NAME##_1: \
|
|
case BUILT_IN_##NAME##_2: \
|
|
case BUILT_IN_##NAME##_4: \
|
|
case BUILT_IN_##NAME##_8: \
|
|
case BUILT_IN_##NAME##_16: \
|
|
atomic_op = OP; \
|
|
other_atomic \
|
|
= (enum built_in_function) (BUILT_IN_##OTHER##_1 \
|
|
+ (DECL_FUNCTION_CODE (callee2) \
|
|
- BUILT_IN_##NAME##_1)); \
|
|
goto handle_atomic_fetch_op;
|
|
|
|
CASE_ATOMIC (ATOMIC_FETCH_ADD, ATOMIC_ADD_FETCH, PLUS_EXPR)
|
|
CASE_ATOMIC (ATOMIC_FETCH_SUB, ATOMIC_SUB_FETCH, MINUS_EXPR)
|
|
CASE_ATOMIC (ATOMIC_FETCH_AND, ATOMIC_AND_FETCH, BIT_AND_EXPR)
|
|
CASE_ATOMIC (ATOMIC_FETCH_XOR, ATOMIC_XOR_FETCH, BIT_XOR_EXPR)
|
|
CASE_ATOMIC (ATOMIC_FETCH_OR, ATOMIC_OR_FETCH, BIT_IOR_EXPR)
|
|
|
|
CASE_ATOMIC (SYNC_FETCH_AND_ADD, SYNC_ADD_AND_FETCH, PLUS_EXPR)
|
|
CASE_ATOMIC (SYNC_FETCH_AND_SUB, SYNC_SUB_AND_FETCH, MINUS_EXPR)
|
|
CASE_ATOMIC (SYNC_FETCH_AND_AND, SYNC_AND_AND_FETCH, BIT_AND_EXPR)
|
|
CASE_ATOMIC (SYNC_FETCH_AND_XOR, SYNC_XOR_AND_FETCH, BIT_XOR_EXPR)
|
|
CASE_ATOMIC (SYNC_FETCH_AND_OR, SYNC_OR_AND_FETCH, BIT_IOR_EXPR)
|
|
|
|
CASE_ATOMIC (ATOMIC_ADD_FETCH, ATOMIC_FETCH_ADD, MINUS_EXPR)
|
|
CASE_ATOMIC (ATOMIC_SUB_FETCH, ATOMIC_FETCH_SUB, PLUS_EXPR)
|
|
CASE_ATOMIC (ATOMIC_XOR_FETCH, ATOMIC_FETCH_XOR, BIT_XOR_EXPR)
|
|
|
|
CASE_ATOMIC (SYNC_ADD_AND_FETCH, SYNC_FETCH_AND_ADD, MINUS_EXPR)
|
|
CASE_ATOMIC (SYNC_SUB_AND_FETCH, SYNC_FETCH_AND_SUB, PLUS_EXPR)
|
|
CASE_ATOMIC (SYNC_XOR_AND_FETCH, SYNC_FETCH_AND_XOR, BIT_XOR_EXPR)
|
|
|
|
#undef CASE_ATOMIC
|
|
|
|
handle_atomic_fetch_op:
|
|
if (gimple_call_num_args (stmt2) >= 2 && gimple_call_lhs (stmt2))
|
|
{
|
|
tree lhs2 = gimple_call_lhs (stmt2), lhsc = lhs2;
|
|
tree arg = gimple_call_arg (stmt2, 1);
|
|
gimple *use_stmt, *cast_stmt = NULL;
|
|
use_operand_p use_p;
|
|
tree ndecl = builtin_decl_explicit (other_atomic);
|
|
|
|
if (ndecl == NULL_TREE || !single_imm_use (lhs2, &use_p, &use_stmt))
|
|
break;
|
|
|
|
if (gimple_assign_cast_p (use_stmt))
|
|
{
|
|
cast_stmt = use_stmt;
|
|
lhsc = gimple_assign_lhs (cast_stmt);
|
|
if (lhsc == NULL_TREE
|
|
|| !INTEGRAL_TYPE_P (TREE_TYPE (lhsc))
|
|
|| (TYPE_PRECISION (TREE_TYPE (lhsc))
|
|
!= TYPE_PRECISION (TREE_TYPE (lhs2)))
|
|
|| !single_imm_use (lhsc, &use_p, &use_stmt))
|
|
{
|
|
use_stmt = cast_stmt;
|
|
cast_stmt = NULL;
|
|
lhsc = lhs2;
|
|
}
|
|
}
|
|
|
|
bool ok = false;
|
|
tree oarg = NULL_TREE;
|
|
enum tree_code ccode = ERROR_MARK;
|
|
tree crhs1 = NULL_TREE, crhs2 = NULL_TREE;
|
|
if (is_gimple_assign (use_stmt)
|
|
&& gimple_assign_rhs_code (use_stmt) == atomic_op)
|
|
{
|
|
if (gimple_assign_rhs1 (use_stmt) == lhsc)
|
|
oarg = gimple_assign_rhs2 (use_stmt);
|
|
else if (atomic_op != MINUS_EXPR)
|
|
oarg = gimple_assign_rhs1 (use_stmt);
|
|
}
|
|
else if (atomic_op == MINUS_EXPR
|
|
&& is_gimple_assign (use_stmt)
|
|
&& gimple_assign_rhs_code (use_stmt) == PLUS_EXPR
|
|
&& TREE_CODE (arg) == INTEGER_CST
|
|
&& (TREE_CODE (gimple_assign_rhs2 (use_stmt))
|
|
== INTEGER_CST))
|
|
{
|
|
tree a = fold_convert (TREE_TYPE (lhs2), arg);
|
|
tree o = fold_convert (TREE_TYPE (lhs2),
|
|
gimple_assign_rhs2 (use_stmt));
|
|
if (wi::to_wide (a) == wi::neg (wi::to_wide (o)))
|
|
ok = true;
|
|
}
|
|
else if (atomic_op == BIT_AND_EXPR || atomic_op == BIT_IOR_EXPR)
|
|
;
|
|
else if (gimple_code (use_stmt) == GIMPLE_COND)
|
|
{
|
|
ccode = gimple_cond_code (use_stmt);
|
|
crhs1 = gimple_cond_lhs (use_stmt);
|
|
crhs2 = gimple_cond_rhs (use_stmt);
|
|
}
|
|
else if (is_gimple_assign (use_stmt))
|
|
{
|
|
if (gimple_assign_rhs_class (use_stmt) == GIMPLE_BINARY_RHS)
|
|
{
|
|
ccode = gimple_assign_rhs_code (use_stmt);
|
|
crhs1 = gimple_assign_rhs1 (use_stmt);
|
|
crhs2 = gimple_assign_rhs2 (use_stmt);
|
|
}
|
|
else if (gimple_assign_rhs_code (use_stmt) == COND_EXPR)
|
|
{
|
|
tree cond = gimple_assign_rhs1 (use_stmt);
|
|
if (COMPARISON_CLASS_P (cond))
|
|
{
|
|
ccode = TREE_CODE (cond);
|
|
crhs1 = TREE_OPERAND (cond, 0);
|
|
crhs2 = TREE_OPERAND (cond, 1);
|
|
}
|
|
}
|
|
}
|
|
if (ccode == EQ_EXPR || ccode == NE_EXPR)
|
|
{
|
|
/* Deal with x - y == 0 or x ^ y == 0
|
|
being optimized into x == y and x + cst == 0
|
|
into x == -cst. */
|
|
tree o = NULL_TREE;
|
|
if (crhs1 == lhsc)
|
|
o = crhs2;
|
|
else if (crhs2 == lhsc)
|
|
o = crhs1;
|
|
if (o && atomic_op != PLUS_EXPR)
|
|
oarg = o;
|
|
else if (o
|
|
&& TREE_CODE (o) == INTEGER_CST
|
|
&& TREE_CODE (arg) == INTEGER_CST)
|
|
{
|
|
tree a = fold_convert (TREE_TYPE (lhs2), arg);
|
|
o = fold_convert (TREE_TYPE (lhs2), o);
|
|
if (wi::to_wide (a) == wi::neg (wi::to_wide (o)))
|
|
ok = true;
|
|
}
|
|
}
|
|
if (oarg && !ok)
|
|
{
|
|
if (operand_equal_p (arg, oarg, 0))
|
|
ok = true;
|
|
else if (TREE_CODE (arg) == SSA_NAME
|
|
&& TREE_CODE (oarg) == SSA_NAME)
|
|
{
|
|
tree oarg2 = oarg;
|
|
if (gimple_assign_cast_p (SSA_NAME_DEF_STMT (oarg)))
|
|
{
|
|
gimple *g = SSA_NAME_DEF_STMT (oarg);
|
|
oarg2 = gimple_assign_rhs1 (g);
|
|
if (TREE_CODE (oarg2) != SSA_NAME
|
|
|| !INTEGRAL_TYPE_P (TREE_TYPE (oarg2))
|
|
|| (TYPE_PRECISION (TREE_TYPE (oarg2))
|
|
!= TYPE_PRECISION (TREE_TYPE (oarg))))
|
|
oarg2 = oarg;
|
|
}
|
|
if (gimple_assign_cast_p (SSA_NAME_DEF_STMT (arg)))
|
|
{
|
|
gimple *g = SSA_NAME_DEF_STMT (arg);
|
|
tree rhs1 = gimple_assign_rhs1 (g);
|
|
/* Handle e.g.
|
|
x.0_1 = (long unsigned int) x_4(D);
|
|
_2 = __atomic_fetch_add_8 (&vlong, x.0_1, 0);
|
|
_3 = (long int) _2;
|
|
_7 = x_4(D) + _3; */
|
|
if (rhs1 == oarg || rhs1 == oarg2)
|
|
ok = true;
|
|
/* Handle e.g.
|
|
x.18_1 = (short unsigned int) x_5(D);
|
|
_2 = (int) x.18_1;
|
|
_3 = __atomic_fetch_xor_2 (&vshort, _2, 0);
|
|
_4 = (short int) _3;
|
|
_8 = x_5(D) ^ _4;
|
|
This happens only for char/short. */
|
|
else if (TREE_CODE (rhs1) == SSA_NAME
|
|
&& INTEGRAL_TYPE_P (TREE_TYPE (rhs1))
|
|
&& (TYPE_PRECISION (TREE_TYPE (rhs1))
|
|
== TYPE_PRECISION (TREE_TYPE (lhs2))))
|
|
{
|
|
g = SSA_NAME_DEF_STMT (rhs1);
|
|
if (gimple_assign_cast_p (g)
|
|
&& (gimple_assign_rhs1 (g) == oarg
|
|
|| gimple_assign_rhs1 (g) == oarg2))
|
|
ok = true;
|
|
}
|
|
}
|
|
if (!ok && arg == oarg2)
|
|
/* Handle e.g.
|
|
_1 = __sync_fetch_and_add_4 (&v, x_5(D));
|
|
_2 = (int) _1;
|
|
x.0_3 = (int) x_5(D);
|
|
_7 = _2 + x.0_3; */
|
|
ok = true;
|
|
}
|
|
}
|
|
|
|
if (ok)
|
|
{
|
|
tree new_lhs = make_ssa_name (TREE_TYPE (lhs2));
|
|
gimple_call_set_lhs (stmt2, new_lhs);
|
|
gimple_call_set_fndecl (stmt2, ndecl);
|
|
gimple_stmt_iterator gsi = gsi_for_stmt (use_stmt);
|
|
if (ccode == ERROR_MARK)
|
|
gimple_assign_set_rhs_with_ops (&gsi, cast_stmt
|
|
? NOP_EXPR : SSA_NAME,
|
|
new_lhs);
|
|
else
|
|
{
|
|
crhs1 = new_lhs;
|
|
crhs2 = build_zero_cst (TREE_TYPE (lhs2));
|
|
if (gimple_code (use_stmt) == GIMPLE_COND)
|
|
{
|
|
gcond *cond_stmt = as_a <gcond *> (use_stmt);
|
|
gimple_cond_set_lhs (cond_stmt, crhs1);
|
|
gimple_cond_set_rhs (cond_stmt, crhs2);
|
|
}
|
|
else if (gimple_assign_rhs_class (use_stmt)
|
|
== GIMPLE_BINARY_RHS)
|
|
{
|
|
gimple_assign_set_rhs1 (use_stmt, crhs1);
|
|
gimple_assign_set_rhs2 (use_stmt, crhs2);
|
|
}
|
|
else
|
|
{
|
|
gcc_checking_assert (gimple_assign_rhs_code (use_stmt)
|
|
== COND_EXPR);
|
|
tree cond = build2 (ccode, boolean_type_node,
|
|
crhs1, crhs2);
|
|
gimple_assign_set_rhs1 (use_stmt, cond);
|
|
}
|
|
}
|
|
update_stmt (use_stmt);
|
|
if (atomic_op != BIT_AND_EXPR
|
|
&& atomic_op != BIT_IOR_EXPR
|
|
&& !stmt_ends_bb_p (stmt2))
|
|
{
|
|
/* For the benefit of debug stmts, emit stmt(s) to set
|
|
lhs2 to the value it had from the new builtin.
|
|
E.g. if it was previously:
|
|
lhs2 = __atomic_fetch_add_8 (ptr, arg, 0);
|
|
emit:
|
|
new_lhs = __atomic_add_fetch_8 (ptr, arg, 0);
|
|
lhs2 = new_lhs - arg;
|
|
We also keep cast_stmt if any in the IL for
|
|
the same reasons.
|
|
These stmts will be DCEd later and proper debug info
|
|
will be emitted.
|
|
This is only possible for reversible operations
|
|
(+/-/^) and without -fnon-call-exceptions. */
|
|
gsi = gsi_for_stmt (stmt2);
|
|
tree type = TREE_TYPE (lhs2);
|
|
if (TREE_CODE (arg) == INTEGER_CST)
|
|
arg = fold_convert (type, arg);
|
|
else if (!useless_type_conversion_p (type, TREE_TYPE (arg)))
|
|
{
|
|
tree narg = make_ssa_name (type);
|
|
gimple *g = gimple_build_assign (narg, NOP_EXPR, arg);
|
|
gsi_insert_after (&gsi, g, GSI_NEW_STMT);
|
|
arg = narg;
|
|
}
|
|
enum tree_code rcode;
|
|
switch (atomic_op)
|
|
{
|
|
case PLUS_EXPR: rcode = MINUS_EXPR; break;
|
|
case MINUS_EXPR: rcode = PLUS_EXPR; break;
|
|
case BIT_XOR_EXPR: rcode = atomic_op; break;
|
|
default: gcc_unreachable ();
|
|
}
|
|
gimple *g = gimple_build_assign (lhs2, rcode, new_lhs, arg);
|
|
gsi_insert_after (&gsi, g, GSI_NEW_STMT);
|
|
update_stmt (stmt2);
|
|
}
|
|
else
|
|
{
|
|
/* For e.g.
|
|
lhs2 = __atomic_fetch_or_8 (ptr, arg, 0);
|
|
after we change it to
|
|
new_lhs = __atomic_or_fetch_8 (ptr, arg, 0);
|
|
there is no way to find out the lhs2 value (i.e.
|
|
what the atomic memory contained before the operation),
|
|
values of some bits are lost. We have checked earlier
|
|
that we don't have any non-debug users except for what
|
|
we are already changing, so we need to reset the
|
|
debug stmts and remove the cast_stmt if any. */
|
|
imm_use_iterator iter;
|
|
FOR_EACH_IMM_USE_STMT (use_stmt, iter, lhs2)
|
|
if (use_stmt != cast_stmt)
|
|
{
|
|
gcc_assert (is_gimple_debug (use_stmt));
|
|
gimple_debug_bind_reset_value (use_stmt);
|
|
update_stmt (use_stmt);
|
|
}
|
|
if (cast_stmt)
|
|
{
|
|
gsi = gsi_for_stmt (cast_stmt);
|
|
gsi_remove (&gsi, true);
|
|
}
|
|
update_stmt (stmt2);
|
|
release_ssa_name (lhs2);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* Given a ssa_name in NAME see if it was defined by an assignment and
|
|
set CODE to be the code and ARG1 to the first operand on the rhs and ARG2
|
|
to the second operand on the rhs. */
|
|
|
|
static inline void
|
|
defcodefor_name (tree name, enum tree_code *code, tree *arg1, tree *arg2)
|
|
{
|
|
gimple *def;
|
|
enum tree_code code1;
|
|
tree arg11;
|
|
tree arg21;
|
|
tree arg31;
|
|
enum gimple_rhs_class grhs_class;
|
|
|
|
code1 = TREE_CODE (name);
|
|
arg11 = name;
|
|
arg21 = NULL_TREE;
|
|
arg31 = NULL_TREE;
|
|
grhs_class = get_gimple_rhs_class (code1);
|
|
|
|
if (code1 == SSA_NAME)
|
|
{
|
|
def = SSA_NAME_DEF_STMT (name);
|
|
|
|
if (def && is_gimple_assign (def)
|
|
&& can_propagate_from (def))
|
|
{
|
|
code1 = gimple_assign_rhs_code (def);
|
|
arg11 = gimple_assign_rhs1 (def);
|
|
arg21 = gimple_assign_rhs2 (def);
|
|
arg31 = gimple_assign_rhs3 (def);
|
|
}
|
|
}
|
|
else if (grhs_class != GIMPLE_SINGLE_RHS)
|
|
code1 = ERROR_MARK;
|
|
|
|
*code = code1;
|
|
*arg1 = arg11;
|
|
if (arg2)
|
|
*arg2 = arg21;
|
|
if (arg31)
|
|
*code = ERROR_MARK;
|
|
}
|
|
|
|
|
|
/* Recognize rotation patterns. Return true if a transformation
|
|
applied, otherwise return false.
|
|
|
|
We are looking for X with unsigned type T with bitsize B, OP being
|
|
+, | or ^, some type T2 wider than T. For:
|
|
(X << CNT1) OP (X >> CNT2) iff CNT1 + CNT2 == B
|
|
((T) ((T2) X << CNT1)) OP ((T) ((T2) X >> CNT2)) iff CNT1 + CNT2 == B
|
|
|
|
transform these into:
|
|
X r<< CNT1
|
|
|
|
Or for:
|
|
(X << Y) OP (X >> (B - Y))
|
|
(X << (int) Y) OP (X >> (int) (B - Y))
|
|
((T) ((T2) X << Y)) OP ((T) ((T2) X >> (B - Y)))
|
|
((T) ((T2) X << (int) Y)) OP ((T) ((T2) X >> (int) (B - Y)))
|
|
(X << Y) | (X >> ((-Y) & (B - 1)))
|
|
(X << (int) Y) | (X >> (int) ((-Y) & (B - 1)))
|
|
((T) ((T2) X << Y)) | ((T) ((T2) X >> ((-Y) & (B - 1))))
|
|
((T) ((T2) X << (int) Y)) | ((T) ((T2) X >> (int) ((-Y) & (B - 1))))
|
|
|
|
transform these into:
|
|
X r<< Y
|
|
|
|
Or for:
|
|
(X << (Y & (B - 1))) | (X >> ((-Y) & (B - 1)))
|
|
(X << (int) (Y & (B - 1))) | (X >> (int) ((-Y) & (B - 1)))
|
|
((T) ((T2) X << (Y & (B - 1)))) | ((T) ((T2) X >> ((-Y) & (B - 1))))
|
|
((T) ((T2) X << (int) (Y & (B - 1)))) \
|
|
| ((T) ((T2) X >> (int) ((-Y) & (B - 1))))
|
|
|
|
transform these into:
|
|
X r<< (Y & (B - 1))
|
|
|
|
Note, in the patterns with T2 type, the type of OP operands
|
|
might be even a signed type, but should have precision B.
|
|
Expressions with & (B - 1) should be recognized only if B is
|
|
a power of 2. */
|
|
|
|
static bool
|
|
simplify_rotate (gimple_stmt_iterator *gsi)
|
|
{
|
|
gimple *stmt = gsi_stmt (*gsi);
|
|
tree arg[2], rtype, rotcnt = NULL_TREE;
|
|
tree def_arg1[2], def_arg2[2];
|
|
enum tree_code def_code[2];
|
|
tree lhs;
|
|
int i;
|
|
bool swapped_p = false;
|
|
gimple *g;
|
|
|
|
arg[0] = gimple_assign_rhs1 (stmt);
|
|
arg[1] = gimple_assign_rhs2 (stmt);
|
|
rtype = TREE_TYPE (arg[0]);
|
|
|
|
/* Only create rotates in complete modes. Other cases are not
|
|
expanded properly. */
|
|
if (!INTEGRAL_TYPE_P (rtype)
|
|
|| !type_has_mode_precision_p (rtype))
|
|
return false;
|
|
|
|
for (i = 0; i < 2; i++)
|
|
defcodefor_name (arg[i], &def_code[i], &def_arg1[i], &def_arg2[i]);
|
|
|
|
/* Look through narrowing (or same precision) conversions. */
|
|
if (CONVERT_EXPR_CODE_P (def_code[0])
|
|
&& CONVERT_EXPR_CODE_P (def_code[1])
|
|
&& INTEGRAL_TYPE_P (TREE_TYPE (def_arg1[0]))
|
|
&& INTEGRAL_TYPE_P (TREE_TYPE (def_arg1[1]))
|
|
&& TYPE_PRECISION (TREE_TYPE (def_arg1[0]))
|
|
== TYPE_PRECISION (TREE_TYPE (def_arg1[1]))
|
|
&& TYPE_PRECISION (TREE_TYPE (def_arg1[0])) >= TYPE_PRECISION (rtype)
|
|
&& has_single_use (arg[0])
|
|
&& has_single_use (arg[1]))
|
|
{
|
|
for (i = 0; i < 2; i++)
|
|
{
|
|
arg[i] = def_arg1[i];
|
|
defcodefor_name (arg[i], &def_code[i], &def_arg1[i], &def_arg2[i]);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Handle signed rotate; the RSHIFT_EXPR has to be done
|
|
in unsigned type but LSHIFT_EXPR could be signed. */
|
|
i = (def_code[0] == LSHIFT_EXPR || def_code[0] == RSHIFT_EXPR);
|
|
if (CONVERT_EXPR_CODE_P (def_code[i])
|
|
&& (def_code[1 - i] == LSHIFT_EXPR || def_code[1 - i] == RSHIFT_EXPR)
|
|
&& INTEGRAL_TYPE_P (TREE_TYPE (def_arg1[i]))
|
|
&& TYPE_PRECISION (rtype) == TYPE_PRECISION (TREE_TYPE (def_arg1[i]))
|
|
&& has_single_use (arg[i]))
|
|
{
|
|
arg[i] = def_arg1[i];
|
|
defcodefor_name (arg[i], &def_code[i], &def_arg1[i], &def_arg2[i]);
|
|
}
|
|
}
|
|
|
|
/* One operand has to be LSHIFT_EXPR and one RSHIFT_EXPR. */
|
|
for (i = 0; i < 2; i++)
|
|
if (def_code[i] != LSHIFT_EXPR && def_code[i] != RSHIFT_EXPR)
|
|
return false;
|
|
else if (!has_single_use (arg[i]))
|
|
return false;
|
|
if (def_code[0] == def_code[1])
|
|
return false;
|
|
|
|
/* If we've looked through narrowing conversions before, look through
|
|
widening conversions from unsigned type with the same precision
|
|
as rtype here. */
|
|
if (TYPE_PRECISION (TREE_TYPE (def_arg1[0])) != TYPE_PRECISION (rtype))
|
|
for (i = 0; i < 2; i++)
|
|
{
|
|
tree tem;
|
|
enum tree_code code;
|
|
defcodefor_name (def_arg1[i], &code, &tem, NULL);
|
|
if (!CONVERT_EXPR_CODE_P (code)
|
|
|| !INTEGRAL_TYPE_P (TREE_TYPE (tem))
|
|
|| TYPE_PRECISION (TREE_TYPE (tem)) != TYPE_PRECISION (rtype))
|
|
return false;
|
|
def_arg1[i] = tem;
|
|
}
|
|
/* Both shifts have to use the same first operand. */
|
|
if (!operand_equal_for_phi_arg_p (def_arg1[0], def_arg1[1])
|
|
|| !types_compatible_p (TREE_TYPE (def_arg1[0]),
|
|
TREE_TYPE (def_arg1[1])))
|
|
{
|
|
if ((TYPE_PRECISION (TREE_TYPE (def_arg1[0]))
|
|
!= TYPE_PRECISION (TREE_TYPE (def_arg1[1])))
|
|
|| (TYPE_UNSIGNED (TREE_TYPE (def_arg1[0]))
|
|
== TYPE_UNSIGNED (TREE_TYPE (def_arg1[1]))))
|
|
return false;
|
|
|
|
/* Handle signed rotate; the RSHIFT_EXPR has to be done
|
|
in unsigned type but LSHIFT_EXPR could be signed. */
|
|
i = def_code[0] != RSHIFT_EXPR;
|
|
if (!TYPE_UNSIGNED (TREE_TYPE (def_arg1[i])))
|
|
return false;
|
|
|
|
tree tem;
|
|
enum tree_code code;
|
|
defcodefor_name (def_arg1[i], &code, &tem, NULL);
|
|
if (!CONVERT_EXPR_CODE_P (code)
|
|
|| !INTEGRAL_TYPE_P (TREE_TYPE (tem))
|
|
|| TYPE_PRECISION (TREE_TYPE (tem)) != TYPE_PRECISION (rtype))
|
|
return false;
|
|
def_arg1[i] = tem;
|
|
if (!operand_equal_for_phi_arg_p (def_arg1[0], def_arg1[1])
|
|
|| !types_compatible_p (TREE_TYPE (def_arg1[0]),
|
|
TREE_TYPE (def_arg1[1])))
|
|
return false;
|
|
}
|
|
else if (!TYPE_UNSIGNED (TREE_TYPE (def_arg1[0])))
|
|
return false;
|
|
|
|
/* CNT1 + CNT2 == B case above. */
|
|
if (tree_fits_uhwi_p (def_arg2[0])
|
|
&& tree_fits_uhwi_p (def_arg2[1])
|
|
&& tree_to_uhwi (def_arg2[0])
|
|
+ tree_to_uhwi (def_arg2[1]) == TYPE_PRECISION (rtype))
|
|
rotcnt = def_arg2[0];
|
|
else if (TREE_CODE (def_arg2[0]) != SSA_NAME
|
|
|| TREE_CODE (def_arg2[1]) != SSA_NAME)
|
|
return false;
|
|
else
|
|
{
|
|
tree cdef_arg1[2], cdef_arg2[2], def_arg2_alt[2];
|
|
enum tree_code cdef_code[2];
|
|
/* Look through conversion of the shift count argument.
|
|
The C/C++ FE cast any shift count argument to integer_type_node.
|
|
The only problem might be if the shift count type maximum value
|
|
is equal or smaller than number of bits in rtype. */
|
|
for (i = 0; i < 2; i++)
|
|
{
|
|
def_arg2_alt[i] = def_arg2[i];
|
|
defcodefor_name (def_arg2[i], &cdef_code[i],
|
|
&cdef_arg1[i], &cdef_arg2[i]);
|
|
if (CONVERT_EXPR_CODE_P (cdef_code[i])
|
|
&& INTEGRAL_TYPE_P (TREE_TYPE (cdef_arg1[i]))
|
|
&& TYPE_PRECISION (TREE_TYPE (cdef_arg1[i]))
|
|
> floor_log2 (TYPE_PRECISION (rtype))
|
|
&& type_has_mode_precision_p (TREE_TYPE (cdef_arg1[i])))
|
|
{
|
|
def_arg2_alt[i] = cdef_arg1[i];
|
|
defcodefor_name (def_arg2_alt[i], &cdef_code[i],
|
|
&cdef_arg1[i], &cdef_arg2[i]);
|
|
}
|
|
}
|
|
for (i = 0; i < 2; i++)
|
|
/* Check for one shift count being Y and the other B - Y,
|
|
with optional casts. */
|
|
if (cdef_code[i] == MINUS_EXPR
|
|
&& tree_fits_shwi_p (cdef_arg1[i])
|
|
&& tree_to_shwi (cdef_arg1[i]) == TYPE_PRECISION (rtype)
|
|
&& TREE_CODE (cdef_arg2[i]) == SSA_NAME)
|
|
{
|
|
tree tem;
|
|
enum tree_code code;
|
|
|
|
if (cdef_arg2[i] == def_arg2[1 - i]
|
|
|| cdef_arg2[i] == def_arg2_alt[1 - i])
|
|
{
|
|
rotcnt = cdef_arg2[i];
|
|
break;
|
|
}
|
|
defcodefor_name (cdef_arg2[i], &code, &tem, NULL);
|
|
if (CONVERT_EXPR_CODE_P (code)
|
|
&& INTEGRAL_TYPE_P (TREE_TYPE (tem))
|
|
&& TYPE_PRECISION (TREE_TYPE (tem))
|
|
> floor_log2 (TYPE_PRECISION (rtype))
|
|
&& type_has_mode_precision_p (TREE_TYPE (tem))
|
|
&& (tem == def_arg2[1 - i]
|
|
|| tem == def_arg2_alt[1 - i]))
|
|
{
|
|
rotcnt = tem;
|
|
break;
|
|
}
|
|
}
|
|
/* The above sequence isn't safe for Y being 0,
|
|
because then one of the shifts triggers undefined behavior.
|
|
This alternative is safe even for rotation count of 0.
|
|
One shift count is Y and the other (-Y) & (B - 1).
|
|
Or one shift count is Y & (B - 1) and the other (-Y) & (B - 1). */
|
|
else if (cdef_code[i] == BIT_AND_EXPR
|
|
&& pow2p_hwi (TYPE_PRECISION (rtype))
|
|
&& tree_fits_shwi_p (cdef_arg2[i])
|
|
&& tree_to_shwi (cdef_arg2[i])
|
|
== TYPE_PRECISION (rtype) - 1
|
|
&& TREE_CODE (cdef_arg1[i]) == SSA_NAME
|
|
&& gimple_assign_rhs_code (stmt) == BIT_IOR_EXPR)
|
|
{
|
|
tree tem;
|
|
enum tree_code code;
|
|
|
|
defcodefor_name (cdef_arg1[i], &code, &tem, NULL);
|
|
if (CONVERT_EXPR_CODE_P (code)
|
|
&& INTEGRAL_TYPE_P (TREE_TYPE (tem))
|
|
&& TYPE_PRECISION (TREE_TYPE (tem))
|
|
> floor_log2 (TYPE_PRECISION (rtype))
|
|
&& type_has_mode_precision_p (TREE_TYPE (tem)))
|
|
defcodefor_name (tem, &code, &tem, NULL);
|
|
|
|
if (code == NEGATE_EXPR)
|
|
{
|
|
if (tem == def_arg2[1 - i] || tem == def_arg2_alt[1 - i])
|
|
{
|
|
rotcnt = tem;
|
|
break;
|
|
}
|
|
tree tem2;
|
|
defcodefor_name (tem, &code, &tem2, NULL);
|
|
if (CONVERT_EXPR_CODE_P (code)
|
|
&& INTEGRAL_TYPE_P (TREE_TYPE (tem2))
|
|
&& TYPE_PRECISION (TREE_TYPE (tem2))
|
|
> floor_log2 (TYPE_PRECISION (rtype))
|
|
&& type_has_mode_precision_p (TREE_TYPE (tem2)))
|
|
{
|
|
if (tem2 == def_arg2[1 - i]
|
|
|| tem2 == def_arg2_alt[1 - i])
|
|
{
|
|
rotcnt = tem2;
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
tem2 = NULL_TREE;
|
|
|
|
if (cdef_code[1 - i] == BIT_AND_EXPR
|
|
&& tree_fits_shwi_p (cdef_arg2[1 - i])
|
|
&& tree_to_shwi (cdef_arg2[1 - i])
|
|
== TYPE_PRECISION (rtype) - 1
|
|
&& TREE_CODE (cdef_arg1[1 - i]) == SSA_NAME)
|
|
{
|
|
if (tem == cdef_arg1[1 - i]
|
|
|| tem2 == cdef_arg1[1 - i])
|
|
{
|
|
rotcnt = def_arg2[1 - i];
|
|
break;
|
|
}
|
|
tree tem3;
|
|
defcodefor_name (cdef_arg1[1 - i], &code, &tem3, NULL);
|
|
if (CONVERT_EXPR_CODE_P (code)
|
|
&& INTEGRAL_TYPE_P (TREE_TYPE (tem3))
|
|
&& TYPE_PRECISION (TREE_TYPE (tem3))
|
|
> floor_log2 (TYPE_PRECISION (rtype))
|
|
&& type_has_mode_precision_p (TREE_TYPE (tem3)))
|
|
{
|
|
if (tem == tem3 || tem2 == tem3)
|
|
{
|
|
rotcnt = def_arg2[1 - i];
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (rotcnt == NULL_TREE)
|
|
return false;
|
|
swapped_p = i != 1;
|
|
}
|
|
|
|
if (!useless_type_conversion_p (TREE_TYPE (def_arg2[0]),
|
|
TREE_TYPE (rotcnt)))
|
|
{
|
|
g = gimple_build_assign (make_ssa_name (TREE_TYPE (def_arg2[0])),
|
|
NOP_EXPR, rotcnt);
|
|
gsi_insert_before (gsi, g, GSI_SAME_STMT);
|
|
rotcnt = gimple_assign_lhs (g);
|
|
}
|
|
lhs = gimple_assign_lhs (stmt);
|
|
if (!useless_type_conversion_p (rtype, TREE_TYPE (def_arg1[0])))
|
|
lhs = make_ssa_name (TREE_TYPE (def_arg1[0]));
|
|
g = gimple_build_assign (lhs,
|
|
((def_code[0] == LSHIFT_EXPR) ^ swapped_p)
|
|
? LROTATE_EXPR : RROTATE_EXPR, def_arg1[0], rotcnt);
|
|
if (!useless_type_conversion_p (rtype, TREE_TYPE (def_arg1[0])))
|
|
{
|
|
gsi_insert_before (gsi, g, GSI_SAME_STMT);
|
|
g = gimple_build_assign (gimple_assign_lhs (stmt), NOP_EXPR, lhs);
|
|
}
|
|
gsi_replace (gsi, g, false);
|
|
return true;
|
|
}
|
|
|
|
|
|
/* Check whether an array contains a valid ctz table. */
|
|
static bool
|
|
check_ctz_array (tree ctor, unsigned HOST_WIDE_INT mulc,
|
|
HOST_WIDE_INT &zero_val, unsigned shift, unsigned bits)
|
|
{
|
|
tree elt, idx;
|
|
unsigned HOST_WIDE_INT i, mask;
|
|
unsigned matched = 0;
|
|
|
|
mask = ((HOST_WIDE_INT_1U << (bits - shift)) - 1) << shift;
|
|
|
|
zero_val = 0;
|
|
|
|
FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor), i, idx, elt)
|
|
{
|
|
if (TREE_CODE (idx) != INTEGER_CST || TREE_CODE (elt) != INTEGER_CST)
|
|
return false;
|
|
if (i > bits * 2)
|
|
return false;
|
|
|
|
unsigned HOST_WIDE_INT index = tree_to_shwi (idx);
|
|
HOST_WIDE_INT val = tree_to_shwi (elt);
|
|
|
|
if (index == 0)
|
|
{
|
|
zero_val = val;
|
|
matched++;
|
|
}
|
|
|
|
if (val >= 0 && val < bits && (((mulc << val) & mask) >> shift) == index)
|
|
matched++;
|
|
|
|
if (matched > bits)
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Check whether a string contains a valid ctz table. */
|
|
static bool
|
|
check_ctz_string (tree string, unsigned HOST_WIDE_INT mulc,
|
|
HOST_WIDE_INT &zero_val, unsigned shift, unsigned bits)
|
|
{
|
|
unsigned HOST_WIDE_INT len = TREE_STRING_LENGTH (string);
|
|
unsigned HOST_WIDE_INT mask;
|
|
unsigned matched = 0;
|
|
const unsigned char *p = (const unsigned char *) TREE_STRING_POINTER (string);
|
|
|
|
if (len < bits || len > bits * 2)
|
|
return false;
|
|
|
|
mask = ((HOST_WIDE_INT_1U << (bits - shift)) - 1) << shift;
|
|
|
|
zero_val = p[0];
|
|
|
|
for (unsigned i = 0; i < len; i++)
|
|
if (p[i] < bits && (((mulc << p[i]) & mask) >> shift) == i)
|
|
matched++;
|
|
|
|
return matched == bits;
|
|
}
|
|
|
|
/* Recognize count trailing zeroes idiom.
|
|
The canonical form is array[((x & -x) * C) >> SHIFT] where C is a magic
|
|
constant which when multiplied by a power of 2 creates a unique value
|
|
in the top 5 or 6 bits. This is then indexed into a table which maps it
|
|
to the number of trailing zeroes. Array[0] is returned so the caller can
|
|
emit an appropriate sequence depending on whether ctz (0) is defined on
|
|
the target. */
|
|
static bool
|
|
optimize_count_trailing_zeroes (tree array_ref, tree x, tree mulc,
|
|
tree tshift, HOST_WIDE_INT &zero_val)
|
|
{
|
|
tree type = TREE_TYPE (array_ref);
|
|
tree array = TREE_OPERAND (array_ref, 0);
|
|
|
|
gcc_assert (TREE_CODE (mulc) == INTEGER_CST);
|
|
gcc_assert (TREE_CODE (tshift) == INTEGER_CST);
|
|
|
|
tree input_type = TREE_TYPE (x);
|
|
unsigned input_bits = tree_to_shwi (TYPE_SIZE (input_type));
|
|
|
|
/* Check the array element type is not wider than 32 bits and the input is
|
|
an unsigned 32-bit or 64-bit type. */
|
|
if (TYPE_PRECISION (type) > 32 || !TYPE_UNSIGNED (input_type))
|
|
return false;
|
|
if (input_bits != 32 && input_bits != 64)
|
|
return false;
|
|
|
|
if (!direct_internal_fn_supported_p (IFN_CTZ, input_type, OPTIMIZE_FOR_BOTH))
|
|
return false;
|
|
|
|
/* Check the lower bound of the array is zero. */
|
|
tree low = array_ref_low_bound (array_ref);
|
|
if (!low || !integer_zerop (low))
|
|
return false;
|
|
|
|
unsigned shiftval = tree_to_shwi (tshift);
|
|
|
|
/* Check the shift extracts the top 5..7 bits. */
|
|
if (shiftval < input_bits - 7 || shiftval > input_bits - 5)
|
|
return false;
|
|
|
|
tree ctor = ctor_for_folding (array);
|
|
if (!ctor)
|
|
return false;
|
|
|
|
unsigned HOST_WIDE_INT val = tree_to_uhwi (mulc);
|
|
|
|
if (TREE_CODE (ctor) == CONSTRUCTOR)
|
|
return check_ctz_array (ctor, val, zero_val, shiftval, input_bits);
|
|
|
|
if (TREE_CODE (ctor) == STRING_CST
|
|
&& TYPE_PRECISION (type) == CHAR_TYPE_SIZE)
|
|
return check_ctz_string (ctor, val, zero_val, shiftval, input_bits);
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Match.pd function to match the ctz expression. */
|
|
extern bool gimple_ctz_table_index (tree, tree *, tree (*)(tree));
|
|
|
|
static bool
|
|
simplify_count_trailing_zeroes (gimple_stmt_iterator *gsi)
|
|
{
|
|
gimple *stmt = gsi_stmt (*gsi);
|
|
tree array_ref = gimple_assign_rhs1 (stmt);
|
|
tree res_ops[3];
|
|
HOST_WIDE_INT zero_val;
|
|
|
|
gcc_checking_assert (TREE_CODE (array_ref) == ARRAY_REF);
|
|
|
|
if (!gimple_ctz_table_index (TREE_OPERAND (array_ref, 1), &res_ops[0], NULL))
|
|
return false;
|
|
|
|
if (optimize_count_trailing_zeroes (array_ref, res_ops[0],
|
|
res_ops[1], res_ops[2], zero_val))
|
|
{
|
|
tree type = TREE_TYPE (res_ops[0]);
|
|
HOST_WIDE_INT ctz_val = 0;
|
|
HOST_WIDE_INT type_size = tree_to_shwi (TYPE_SIZE (type));
|
|
bool zero_ok
|
|
= CTZ_DEFINED_VALUE_AT_ZERO (SCALAR_INT_TYPE_MODE (type), ctz_val) == 2;
|
|
|
|
/* If the input value can't be zero, don't special case ctz (0). */
|
|
if (tree_expr_nonzero_p (res_ops[0]))
|
|
{
|
|
zero_ok = true;
|
|
zero_val = 0;
|
|
ctz_val = 0;
|
|
}
|
|
|
|
/* Skip if there is no value defined at zero, or if we can't easily
|
|
return the correct value for zero. */
|
|
if (!zero_ok)
|
|
return false;
|
|
if (zero_val != ctz_val && !(zero_val == 0 && ctz_val == type_size))
|
|
return false;
|
|
|
|
gimple_seq seq = NULL;
|
|
gimple *g;
|
|
gcall *call = gimple_build_call_internal (IFN_CTZ, 1, res_ops[0]);
|
|
gimple_set_location (call, gimple_location (stmt));
|
|
gimple_set_lhs (call, make_ssa_name (integer_type_node));
|
|
gimple_seq_add_stmt (&seq, call);
|
|
|
|
tree prev_lhs = gimple_call_lhs (call);
|
|
|
|
/* Emit ctz (x) & 31 if ctz (0) is 32 but we need to return 0. */
|
|
if (zero_val == 0 && ctz_val == type_size)
|
|
{
|
|
g = gimple_build_assign (make_ssa_name (integer_type_node),
|
|
BIT_AND_EXPR, prev_lhs,
|
|
build_int_cst (integer_type_node,
|
|
type_size - 1));
|
|
gimple_set_location (g, gimple_location (stmt));
|
|
gimple_seq_add_stmt (&seq, g);
|
|
prev_lhs = gimple_assign_lhs (g);
|
|
}
|
|
|
|
g = gimple_build_assign (gimple_assign_lhs (stmt), NOP_EXPR, prev_lhs);
|
|
gimple_seq_add_stmt (&seq, g);
|
|
gsi_replace_with_seq (gsi, seq, true);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
/* Combine an element access with a shuffle. Returns true if there were
|
|
any changes made, else it returns false. */
|
|
|
|
static bool
|
|
simplify_bitfield_ref (gimple_stmt_iterator *gsi)
|
|
{
|
|
gimple *stmt = gsi_stmt (*gsi);
|
|
gimple *def_stmt;
|
|
tree op, op0, op1;
|
|
tree elem_type;
|
|
unsigned idx, size;
|
|
enum tree_code code;
|
|
|
|
op = gimple_assign_rhs1 (stmt);
|
|
gcc_checking_assert (TREE_CODE (op) == BIT_FIELD_REF);
|
|
|
|
op0 = TREE_OPERAND (op, 0);
|
|
if (TREE_CODE (op0) != SSA_NAME
|
|
|| TREE_CODE (TREE_TYPE (op0)) != VECTOR_TYPE)
|
|
return false;
|
|
|
|
def_stmt = get_prop_source_stmt (op0, false, NULL);
|
|
if (!def_stmt || !can_propagate_from (def_stmt))
|
|
return false;
|
|
|
|
op1 = TREE_OPERAND (op, 1);
|
|
code = gimple_assign_rhs_code (def_stmt);
|
|
elem_type = TREE_TYPE (TREE_TYPE (op0));
|
|
if (TREE_TYPE (op) != elem_type)
|
|
return false;
|
|
|
|
size = TREE_INT_CST_LOW (TYPE_SIZE (elem_type));
|
|
if (maybe_ne (bit_field_size (op), size))
|
|
return false;
|
|
|
|
if (code == VEC_PERM_EXPR
|
|
&& constant_multiple_p (bit_field_offset (op), size, &idx))
|
|
{
|
|
tree p, m, tem;
|
|
unsigned HOST_WIDE_INT nelts;
|
|
m = gimple_assign_rhs3 (def_stmt);
|
|
if (TREE_CODE (m) != VECTOR_CST
|
|
|| !VECTOR_CST_NELTS (m).is_constant (&nelts))
|
|
return false;
|
|
idx = TREE_INT_CST_LOW (VECTOR_CST_ELT (m, idx));
|
|
idx %= 2 * nelts;
|
|
if (idx < nelts)
|
|
{
|
|
p = gimple_assign_rhs1 (def_stmt);
|
|
}
|
|
else
|
|
{
|
|
p = gimple_assign_rhs2 (def_stmt);
|
|
idx -= nelts;
|
|
}
|
|
tem = build3 (BIT_FIELD_REF, TREE_TYPE (op),
|
|
unshare_expr (p), op1, bitsize_int (idx * size));
|
|
gimple_assign_set_rhs1 (stmt, tem);
|
|
fold_stmt (gsi);
|
|
update_stmt (gsi_stmt (*gsi));
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Determine whether applying the 2 permutations (mask1 then mask2)
|
|
gives back one of the input. */
|
|
|
|
static int
|
|
is_combined_permutation_identity (tree mask1, tree mask2)
|
|
{
|
|
tree mask;
|
|
unsigned HOST_WIDE_INT nelts, i, j;
|
|
bool maybe_identity1 = true;
|
|
bool maybe_identity2 = true;
|
|
|
|
gcc_checking_assert (TREE_CODE (mask1) == VECTOR_CST
|
|
&& TREE_CODE (mask2) == VECTOR_CST);
|
|
mask = fold_ternary (VEC_PERM_EXPR, TREE_TYPE (mask1), mask1, mask1, mask2);
|
|
if (mask == NULL_TREE || TREE_CODE (mask) != VECTOR_CST)
|
|
return 0;
|
|
|
|
if (!VECTOR_CST_NELTS (mask).is_constant (&nelts))
|
|
return 0;
|
|
for (i = 0; i < nelts; i++)
|
|
{
|
|
tree val = VECTOR_CST_ELT (mask, i);
|
|
gcc_assert (TREE_CODE (val) == INTEGER_CST);
|
|
j = TREE_INT_CST_LOW (val) & (2 * nelts - 1);
|
|
if (j == i)
|
|
maybe_identity2 = false;
|
|
else if (j == i + nelts)
|
|
maybe_identity1 = false;
|
|
else
|
|
return 0;
|
|
}
|
|
return maybe_identity1 ? 1 : maybe_identity2 ? 2 : 0;
|
|
}
|
|
|
|
/* Combine a shuffle with its arguments. Returns 1 if there were any
|
|
changes made, 2 if cfg-cleanup needs to run. Else it returns 0. */
|
|
|
|
static int
|
|
simplify_permutation (gimple_stmt_iterator *gsi)
|
|
{
|
|
gimple *stmt = gsi_stmt (*gsi);
|
|
gimple *def_stmt = NULL;
|
|
tree op0, op1, op2, op3, arg0, arg1;
|
|
enum tree_code code, code2 = ERROR_MARK;
|
|
bool single_use_op0 = false;
|
|
|
|
gcc_checking_assert (gimple_assign_rhs_code (stmt) == VEC_PERM_EXPR);
|
|
|
|
op0 = gimple_assign_rhs1 (stmt);
|
|
op1 = gimple_assign_rhs2 (stmt);
|
|
op2 = gimple_assign_rhs3 (stmt);
|
|
|
|
if (TREE_CODE (op2) != VECTOR_CST)
|
|
return 0;
|
|
|
|
if (TREE_CODE (op0) == VECTOR_CST)
|
|
{
|
|
code = VECTOR_CST;
|
|
arg0 = op0;
|
|
}
|
|
else if (TREE_CODE (op0) == SSA_NAME)
|
|
{
|
|
def_stmt = get_prop_source_stmt (op0, false, &single_use_op0);
|
|
if (!def_stmt)
|
|
return 0;
|
|
code = gimple_assign_rhs_code (def_stmt);
|
|
if (code == VIEW_CONVERT_EXPR)
|
|
{
|
|
tree rhs = gimple_assign_rhs1 (def_stmt);
|
|
tree name = TREE_OPERAND (rhs, 0);
|
|
if (TREE_CODE (name) != SSA_NAME)
|
|
return 0;
|
|
if (!has_single_use (name))
|
|
single_use_op0 = false;
|
|
/* Here we update the def_stmt through this VIEW_CONVERT_EXPR,
|
|
but still keep the code to indicate it comes from
|
|
VIEW_CONVERT_EXPR. */
|
|
def_stmt = SSA_NAME_DEF_STMT (name);
|
|
if (!def_stmt || !is_gimple_assign (def_stmt))
|
|
return 0;
|
|
if (gimple_assign_rhs_code (def_stmt) != CONSTRUCTOR)
|
|
return 0;
|
|
}
|
|
if (!can_propagate_from (def_stmt))
|
|
return 0;
|
|
arg0 = gimple_assign_rhs1 (def_stmt);
|
|
}
|
|
else
|
|
return 0;
|
|
|
|
/* Two consecutive shuffles. */
|
|
if (code == VEC_PERM_EXPR)
|
|
{
|
|
tree orig;
|
|
int ident;
|
|
|
|
if (op0 != op1)
|
|
return 0;
|
|
op3 = gimple_assign_rhs3 (def_stmt);
|
|
if (TREE_CODE (op3) != VECTOR_CST)
|
|
return 0;
|
|
ident = is_combined_permutation_identity (op3, op2);
|
|
if (!ident)
|
|
return 0;
|
|
orig = (ident == 1) ? gimple_assign_rhs1 (def_stmt)
|
|
: gimple_assign_rhs2 (def_stmt);
|
|
gimple_assign_set_rhs1 (stmt, unshare_expr (orig));
|
|
gimple_assign_set_rhs_code (stmt, TREE_CODE (orig));
|
|
gimple_set_num_ops (stmt, 2);
|
|
update_stmt (stmt);
|
|
return remove_prop_source_from_use (op0) ? 2 : 1;
|
|
}
|
|
else if (code == CONSTRUCTOR
|
|
|| code == VECTOR_CST
|
|
|| code == VIEW_CONVERT_EXPR)
|
|
{
|
|
if (op0 != op1)
|
|
{
|
|
if (TREE_CODE (op0) == SSA_NAME && !single_use_op0)
|
|
return 0;
|
|
|
|
if (TREE_CODE (op1) == VECTOR_CST)
|
|
arg1 = op1;
|
|
else if (TREE_CODE (op1) == SSA_NAME)
|
|
{
|
|
gimple *def_stmt2 = get_prop_source_stmt (op1, true, NULL);
|
|
if (!def_stmt2)
|
|
return 0;
|
|
code2 = gimple_assign_rhs_code (def_stmt2);
|
|
if (code2 == VIEW_CONVERT_EXPR)
|
|
{
|
|
tree rhs = gimple_assign_rhs1 (def_stmt2);
|
|
tree name = TREE_OPERAND (rhs, 0);
|
|
if (TREE_CODE (name) != SSA_NAME)
|
|
return 0;
|
|
if (!has_single_use (name))
|
|
return 0;
|
|
def_stmt2 = SSA_NAME_DEF_STMT (name);
|
|
if (!def_stmt2 || !is_gimple_assign (def_stmt2))
|
|
return 0;
|
|
if (gimple_assign_rhs_code (def_stmt2) != CONSTRUCTOR)
|
|
return 0;
|
|
}
|
|
else if (code2 != CONSTRUCTOR && code2 != VECTOR_CST)
|
|
return 0;
|
|
if (!can_propagate_from (def_stmt2))
|
|
return 0;
|
|
arg1 = gimple_assign_rhs1 (def_stmt2);
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
/* Already used twice in this statement. */
|
|
if (TREE_CODE (op0) == SSA_NAME && num_imm_uses (op0) > 2)
|
|
return 0;
|
|
arg1 = arg0;
|
|
}
|
|
|
|
/* If there are any VIEW_CONVERT_EXPRs found when finding permutation
|
|
operands source, check whether it's valid to transform and prepare
|
|
the required new operands. */
|
|
if (code == VIEW_CONVERT_EXPR || code2 == VIEW_CONVERT_EXPR)
|
|
{
|
|
/* Figure out the target vector type to which operands should be
|
|
converted. If both are CONSTRUCTOR, the types should be the
|
|
same, otherwise, use the one of CONSTRUCTOR. */
|
|
tree tgt_type = NULL_TREE;
|
|
if (code == VIEW_CONVERT_EXPR)
|
|
{
|
|
gcc_assert (gimple_assign_rhs_code (def_stmt) == CONSTRUCTOR);
|
|
code = CONSTRUCTOR;
|
|
tgt_type = TREE_TYPE (arg0);
|
|
}
|
|
if (code2 == VIEW_CONVERT_EXPR)
|
|
{
|
|
tree arg1_type = TREE_TYPE (arg1);
|
|
if (tgt_type == NULL_TREE)
|
|
tgt_type = arg1_type;
|
|
else if (tgt_type != arg1_type)
|
|
return 0;
|
|
}
|
|
|
|
if (!VECTOR_TYPE_P (tgt_type))
|
|
return 0;
|
|
tree op2_type = TREE_TYPE (op2);
|
|
|
|
/* Figure out the shrunk factor. */
|
|
poly_uint64 tgt_units = TYPE_VECTOR_SUBPARTS (tgt_type);
|
|
poly_uint64 op2_units = TYPE_VECTOR_SUBPARTS (op2_type);
|
|
if (maybe_gt (tgt_units, op2_units))
|
|
return 0;
|
|
unsigned int factor;
|
|
if (!constant_multiple_p (op2_units, tgt_units, &factor))
|
|
return 0;
|
|
|
|
/* Build the new permutation control vector as target vector. */
|
|
vec_perm_builder builder;
|
|
if (!tree_to_vec_perm_builder (&builder, op2))
|
|
return 0;
|
|
vec_perm_indices indices (builder, 2, op2_units);
|
|
vec_perm_indices new_indices;
|
|
if (new_indices.new_shrunk_vector (indices, factor))
|
|
{
|
|
tree mask_type = tgt_type;
|
|
if (!VECTOR_INTEGER_TYPE_P (mask_type))
|
|
{
|
|
tree elem_type = TREE_TYPE (mask_type);
|
|
unsigned elem_size = TREE_INT_CST_LOW (TYPE_SIZE (elem_type));
|
|
tree int_type = build_nonstandard_integer_type (elem_size, 0);
|
|
mask_type = build_vector_type (int_type, tgt_units);
|
|
}
|
|
op2 = vec_perm_indices_to_tree (mask_type, new_indices);
|
|
}
|
|
else
|
|
return 0;
|
|
|
|
/* Convert the VECTOR_CST to the appropriate vector type. */
|
|
if (tgt_type != TREE_TYPE (arg0))
|
|
arg0 = fold_build1 (VIEW_CONVERT_EXPR, tgt_type, arg0);
|
|
else if (tgt_type != TREE_TYPE (arg1))
|
|
arg1 = fold_build1 (VIEW_CONVERT_EXPR, tgt_type, arg1);
|
|
}
|
|
|
|
/* VIEW_CONVERT_EXPR should be updated to CONSTRUCTOR before. */
|
|
gcc_assert (code == CONSTRUCTOR || code == VECTOR_CST);
|
|
|
|
/* Shuffle of a constructor. */
|
|
bool ret = false;
|
|
tree res_type = TREE_TYPE (arg0);
|
|
tree opt = fold_ternary (VEC_PERM_EXPR, res_type, arg0, arg1, op2);
|
|
if (!opt
|
|
|| (TREE_CODE (opt) != CONSTRUCTOR && TREE_CODE (opt) != VECTOR_CST))
|
|
return 0;
|
|
/* Found VIEW_CONVERT_EXPR before, need one explicit conversion. */
|
|
if (res_type != TREE_TYPE (op0))
|
|
{
|
|
tree name = make_ssa_name (TREE_TYPE (opt));
|
|
gimple *ass_stmt = gimple_build_assign (name, opt);
|
|
gsi_insert_before (gsi, ass_stmt, GSI_SAME_STMT);
|
|
opt = build1 (VIEW_CONVERT_EXPR, TREE_TYPE (op0), name);
|
|
}
|
|
gimple_assign_set_rhs_from_tree (gsi, opt);
|
|
update_stmt (gsi_stmt (*gsi));
|
|
if (TREE_CODE (op0) == SSA_NAME)
|
|
ret = remove_prop_source_from_use (op0);
|
|
if (op0 != op1 && TREE_CODE (op1) == SSA_NAME)
|
|
ret |= remove_prop_source_from_use (op1);
|
|
return ret ? 2 : 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Get the BIT_FIELD_REF definition of VAL, if any, looking through
|
|
conversions with code CONV_CODE or update it if still ERROR_MARK.
|
|
Return NULL_TREE if no such matching def was found. */
|
|
|
|
static tree
|
|
get_bit_field_ref_def (tree val, enum tree_code &conv_code)
|
|
{
|
|
if (TREE_CODE (val) != SSA_NAME)
|
|
return NULL_TREE ;
|
|
gimple *def_stmt = get_prop_source_stmt (val, false, NULL);
|
|
if (!def_stmt)
|
|
return NULL_TREE;
|
|
enum tree_code code = gimple_assign_rhs_code (def_stmt);
|
|
if (code == FLOAT_EXPR
|
|
|| code == FIX_TRUNC_EXPR
|
|
|| CONVERT_EXPR_CODE_P (code))
|
|
{
|
|
tree op1 = gimple_assign_rhs1 (def_stmt);
|
|
if (conv_code == ERROR_MARK)
|
|
conv_code = code;
|
|
else if (conv_code != code)
|
|
return NULL_TREE;
|
|
if (TREE_CODE (op1) != SSA_NAME)
|
|
return NULL_TREE;
|
|
def_stmt = SSA_NAME_DEF_STMT (op1);
|
|
if (! is_gimple_assign (def_stmt))
|
|
return NULL_TREE;
|
|
code = gimple_assign_rhs_code (def_stmt);
|
|
}
|
|
if (code != BIT_FIELD_REF)
|
|
return NULL_TREE;
|
|
return gimple_assign_rhs1 (def_stmt);
|
|
}
|
|
|
|
/* Recognize a VEC_PERM_EXPR. Returns true if there were any changes. */
|
|
|
|
static bool
|
|
simplify_vector_constructor (gimple_stmt_iterator *gsi)
|
|
{
|
|
gimple *stmt = gsi_stmt (*gsi);
|
|
tree op, orig[2], type, elem_type;
|
|
unsigned elem_size, i;
|
|
unsigned HOST_WIDE_INT nelts;
|
|
unsigned HOST_WIDE_INT refnelts;
|
|
enum tree_code conv_code;
|
|
constructor_elt *elt;
|
|
|
|
op = gimple_assign_rhs1 (stmt);
|
|
type = TREE_TYPE (op);
|
|
gcc_checking_assert (TREE_CODE (op) == CONSTRUCTOR
|
|
&& TREE_CODE (type) == VECTOR_TYPE);
|
|
|
|
if (!TYPE_VECTOR_SUBPARTS (type).is_constant (&nelts))
|
|
return false;
|
|
elem_type = TREE_TYPE (type);
|
|
elem_size = TREE_INT_CST_LOW (TYPE_SIZE (elem_type));
|
|
|
|
orig[0] = NULL;
|
|
orig[1] = NULL;
|
|
conv_code = ERROR_MARK;
|
|
bool maybe_ident = true;
|
|
bool maybe_blend[2] = { true, true };
|
|
tree one_constant = NULL_TREE;
|
|
tree one_nonconstant = NULL_TREE;
|
|
auto_vec<tree> constants;
|
|
constants.safe_grow_cleared (nelts, true);
|
|
auto_vec<std::pair<unsigned, unsigned>, 64> elts;
|
|
FOR_EACH_VEC_SAFE_ELT (CONSTRUCTOR_ELTS (op), i, elt)
|
|
{
|
|
tree ref, op1;
|
|
unsigned int elem;
|
|
|
|
if (i >= nelts)
|
|
return false;
|
|
|
|
/* Look for elements extracted and possibly converted from
|
|
another vector. */
|
|
op1 = get_bit_field_ref_def (elt->value, conv_code);
|
|
if (op1
|
|
&& TREE_CODE ((ref = TREE_OPERAND (op1, 0))) == SSA_NAME
|
|
&& VECTOR_TYPE_P (TREE_TYPE (ref))
|
|
&& useless_type_conversion_p (TREE_TYPE (op1),
|
|
TREE_TYPE (TREE_TYPE (ref)))
|
|
&& constant_multiple_p (bit_field_offset (op1),
|
|
bit_field_size (op1), &elem)
|
|
&& TYPE_VECTOR_SUBPARTS (TREE_TYPE (ref)).is_constant (&refnelts))
|
|
{
|
|
unsigned int j;
|
|
for (j = 0; j < 2; ++j)
|
|
{
|
|
if (!orig[j])
|
|
{
|
|
if (j == 0
|
|
|| useless_type_conversion_p (TREE_TYPE (orig[0]),
|
|
TREE_TYPE (ref)))
|
|
break;
|
|
}
|
|
else if (ref == orig[j])
|
|
break;
|
|
}
|
|
/* Found a suitable vector element. */
|
|
if (j < 2)
|
|
{
|
|
orig[j] = ref;
|
|
if (elem != i || j != 0)
|
|
maybe_ident = false;
|
|
if (elem != i)
|
|
maybe_blend[j] = false;
|
|
elts.safe_push (std::make_pair (j, elem));
|
|
continue;
|
|
}
|
|
/* Else fallthru. */
|
|
}
|
|
/* Handle elements not extracted from a vector.
|
|
1. constants by permuting with constant vector
|
|
2. a unique non-constant element by permuting with a splat vector */
|
|
if (orig[1]
|
|
&& orig[1] != error_mark_node)
|
|
return false;
|
|
orig[1] = error_mark_node;
|
|
if (CONSTANT_CLASS_P (elt->value))
|
|
{
|
|
if (one_nonconstant)
|
|
return false;
|
|
if (!one_constant)
|
|
one_constant = elt->value;
|
|
constants[i] = elt->value;
|
|
}
|
|
else
|
|
{
|
|
if (one_constant)
|
|
return false;
|
|
if (!one_nonconstant)
|
|
one_nonconstant = elt->value;
|
|
else if (!operand_equal_p (one_nonconstant, elt->value, 0))
|
|
return false;
|
|
}
|
|
elts.safe_push (std::make_pair (1, i));
|
|
maybe_ident = false;
|
|
}
|
|
if (i < nelts)
|
|
return false;
|
|
|
|
if (! orig[0]
|
|
|| ! VECTOR_TYPE_P (TREE_TYPE (orig[0])))
|
|
return false;
|
|
refnelts = TYPE_VECTOR_SUBPARTS (TREE_TYPE (orig[0])).to_constant ();
|
|
/* We currently do not handle larger destination vectors. */
|
|
if (refnelts < nelts)
|
|
return false;
|
|
|
|
if (maybe_ident)
|
|
{
|
|
tree conv_src_type
|
|
= (nelts != refnelts
|
|
? (conv_code != ERROR_MARK
|
|
? build_vector_type (TREE_TYPE (TREE_TYPE (orig[0])), nelts)
|
|
: type)
|
|
: TREE_TYPE (orig[0]));
|
|
if (conv_code != ERROR_MARK
|
|
&& !supportable_convert_operation (conv_code, type, conv_src_type,
|
|
&conv_code))
|
|
{
|
|
/* Only few targets implement direct conversion patterns so try
|
|
some simple special cases via VEC_[UN]PACK[_FLOAT]_LO_EXPR. */
|
|
optab optab;
|
|
tree halfvectype, dblvectype;
|
|
enum tree_code unpack_op;
|
|
|
|
if (!BYTES_BIG_ENDIAN)
|
|
unpack_op = (FLOAT_TYPE_P (TREE_TYPE (type))
|
|
? VEC_UNPACK_FLOAT_LO_EXPR
|
|
: VEC_UNPACK_LO_EXPR);
|
|
else
|
|
unpack_op = (FLOAT_TYPE_P (TREE_TYPE (type))
|
|
? VEC_UNPACK_FLOAT_HI_EXPR
|
|
: VEC_UNPACK_HI_EXPR);
|
|
|
|
if (CONVERT_EXPR_CODE_P (conv_code)
|
|
&& (2 * TYPE_PRECISION (TREE_TYPE (TREE_TYPE (orig[0])))
|
|
== TYPE_PRECISION (TREE_TYPE (type)))
|
|
&& mode_for_vector (as_a <scalar_mode>
|
|
(TYPE_MODE (TREE_TYPE (TREE_TYPE (orig[0])))),
|
|
nelts * 2).exists ()
|
|
&& (dblvectype
|
|
= build_vector_type (TREE_TYPE (TREE_TYPE (orig[0])),
|
|
nelts * 2))
|
|
/* Only use it for vector modes or for vector booleans
|
|
represented as scalar bitmasks. See PR95528. */
|
|
&& (VECTOR_MODE_P (TYPE_MODE (dblvectype))
|
|
|| VECTOR_BOOLEAN_TYPE_P (dblvectype))
|
|
&& (optab = optab_for_tree_code (unpack_op,
|
|
dblvectype,
|
|
optab_default))
|
|
&& (optab_handler (optab, TYPE_MODE (dblvectype))
|
|
!= CODE_FOR_nothing))
|
|
{
|
|
gimple_seq stmts = NULL;
|
|
tree dbl;
|
|
if (refnelts == nelts)
|
|
{
|
|
/* ??? Paradoxical subregs don't exist, so insert into
|
|
the lower half of a wider zero vector. */
|
|
dbl = gimple_build (&stmts, BIT_INSERT_EXPR, dblvectype,
|
|
build_zero_cst (dblvectype), orig[0],
|
|
bitsize_zero_node);
|
|
}
|
|
else if (refnelts == 2 * nelts)
|
|
dbl = orig[0];
|
|
else
|
|
dbl = gimple_build (&stmts, BIT_FIELD_REF, dblvectype,
|
|
orig[0], TYPE_SIZE (dblvectype),
|
|
bitsize_zero_node);
|
|
gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT);
|
|
gimple_assign_set_rhs_with_ops (gsi, unpack_op, dbl);
|
|
}
|
|
else if (CONVERT_EXPR_CODE_P (conv_code)
|
|
&& (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (orig[0])))
|
|
== 2 * TYPE_PRECISION (TREE_TYPE (type)))
|
|
&& mode_for_vector (as_a <scalar_mode>
|
|
(TYPE_MODE
|
|
(TREE_TYPE (TREE_TYPE (orig[0])))),
|
|
nelts / 2).exists ()
|
|
&& (halfvectype
|
|
= build_vector_type (TREE_TYPE (TREE_TYPE (orig[0])),
|
|
nelts / 2))
|
|
/* Only use it for vector modes or for vector booleans
|
|
represented as scalar bitmasks. See PR95528. */
|
|
&& (VECTOR_MODE_P (TYPE_MODE (halfvectype))
|
|
|| VECTOR_BOOLEAN_TYPE_P (halfvectype))
|
|
&& (optab = optab_for_tree_code (VEC_PACK_TRUNC_EXPR,
|
|
halfvectype,
|
|
optab_default))
|
|
&& (optab_handler (optab, TYPE_MODE (halfvectype))
|
|
!= CODE_FOR_nothing))
|
|
{
|
|
gimple_seq stmts = NULL;
|
|
tree low = gimple_build (&stmts, BIT_FIELD_REF, halfvectype,
|
|
orig[0], TYPE_SIZE (halfvectype),
|
|
bitsize_zero_node);
|
|
tree hig = gimple_build (&stmts, BIT_FIELD_REF, halfvectype,
|
|
orig[0], TYPE_SIZE (halfvectype),
|
|
TYPE_SIZE (halfvectype));
|
|
gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT);
|
|
gimple_assign_set_rhs_with_ops (gsi, VEC_PACK_TRUNC_EXPR,
|
|
low, hig);
|
|
}
|
|
else
|
|
return false;
|
|
update_stmt (gsi_stmt (*gsi));
|
|
return true;
|
|
}
|
|
if (nelts != refnelts)
|
|
{
|
|
gassign *lowpart
|
|
= gimple_build_assign (make_ssa_name (conv_src_type),
|
|
build3 (BIT_FIELD_REF, conv_src_type,
|
|
orig[0], TYPE_SIZE (conv_src_type),
|
|
bitsize_zero_node));
|
|
gsi_insert_before (gsi, lowpart, GSI_SAME_STMT);
|
|
orig[0] = gimple_assign_lhs (lowpart);
|
|
}
|
|
if (conv_code == ERROR_MARK)
|
|
{
|
|
tree src_type = TREE_TYPE (orig[0]);
|
|
if (!useless_type_conversion_p (type, src_type))
|
|
{
|
|
gcc_assert (known_eq (TYPE_VECTOR_SUBPARTS (type),
|
|
TYPE_VECTOR_SUBPARTS (src_type))
|
|
&& useless_type_conversion_p (TREE_TYPE (type),
|
|
TREE_TYPE (src_type)));
|
|
tree rhs = build1 (VIEW_CONVERT_EXPR, type, orig[0]);
|
|
orig[0] = make_ssa_name (type);
|
|
gassign *assign = gimple_build_assign (orig[0], rhs);
|
|
gsi_insert_before (gsi, assign, GSI_SAME_STMT);
|
|
}
|
|
gimple_assign_set_rhs_from_tree (gsi, orig[0]);
|
|
}
|
|
else
|
|
gimple_assign_set_rhs_with_ops (gsi, conv_code, orig[0],
|
|
NULL_TREE, NULL_TREE);
|
|
}
|
|
else
|
|
{
|
|
/* If we combine a vector with a non-vector avoid cases where
|
|
we'll obviously end up with more GIMPLE stmts which is when
|
|
we'll later not fold this to a single insert into the vector
|
|
and we had a single extract originally. See PR92819. */
|
|
if (nelts == 2
|
|
&& refnelts > 2
|
|
&& orig[1] == error_mark_node
|
|
&& !maybe_blend[0])
|
|
return false;
|
|
tree mask_type, perm_type, conv_src_type;
|
|
perm_type = TREE_TYPE (orig[0]);
|
|
conv_src_type = (nelts == refnelts
|
|
? perm_type
|
|
: build_vector_type (TREE_TYPE (perm_type), nelts));
|
|
if (conv_code != ERROR_MARK
|
|
&& !supportable_convert_operation (conv_code, type, conv_src_type,
|
|
&conv_code))
|
|
return false;
|
|
|
|
/* Now that we know the number of elements of the source build the
|
|
permute vector.
|
|
??? When the second vector has constant values we can shuffle
|
|
it and its source indexes to make the permutation supported.
|
|
For now it mimics a blend. */
|
|
vec_perm_builder sel (refnelts, refnelts, 1);
|
|
bool all_same_p = true;
|
|
for (i = 0; i < elts.length (); ++i)
|
|
{
|
|
sel.quick_push (elts[i].second + elts[i].first * refnelts);
|
|
all_same_p &= known_eq (sel[i], sel[0]);
|
|
}
|
|
/* And fill the tail with "something". It's really don't care,
|
|
and ideally we'd allow VEC_PERM to have a smaller destination
|
|
vector. As a heuristic:
|
|
|
|
(a) if what we have so far duplicates a single element, make the
|
|
tail do the same
|
|
|
|
(b) otherwise preserve a uniform orig[0]. This facilitates
|
|
later pattern-matching of VEC_PERM_EXPR to a BIT_INSERT_EXPR. */
|
|
for (; i < refnelts; ++i)
|
|
sel.quick_push (all_same_p
|
|
? sel[0]
|
|
: (elts[0].second == 0 && elts[0].first == 0
|
|
? 0 : refnelts) + i);
|
|
vec_perm_indices indices (sel, orig[1] ? 2 : 1, refnelts);
|
|
if (!can_vec_perm_const_p (TYPE_MODE (perm_type), indices))
|
|
return false;
|
|
mask_type
|
|
= build_vector_type (build_nonstandard_integer_type (elem_size, 1),
|
|
refnelts);
|
|
if (GET_MODE_CLASS (TYPE_MODE (mask_type)) != MODE_VECTOR_INT
|
|
|| maybe_ne (GET_MODE_SIZE (TYPE_MODE (mask_type)),
|
|
GET_MODE_SIZE (TYPE_MODE (perm_type))))
|
|
return false;
|
|
tree op2 = vec_perm_indices_to_tree (mask_type, indices);
|
|
bool converted_orig1 = false;
|
|
gimple_seq stmts = NULL;
|
|
if (!orig[1])
|
|
orig[1] = orig[0];
|
|
else if (orig[1] == error_mark_node
|
|
&& one_nonconstant)
|
|
{
|
|
/* ??? We can see if we can safely convert to the original
|
|
element type. */
|
|
converted_orig1 = conv_code != ERROR_MARK;
|
|
orig[1] = gimple_build_vector_from_val (&stmts, UNKNOWN_LOCATION,
|
|
converted_orig1
|
|
? type : perm_type,
|
|
one_nonconstant);
|
|
}
|
|
else if (orig[1] == error_mark_node)
|
|
{
|
|
/* ??? See if we can convert the vector to the original type. */
|
|
converted_orig1 = conv_code != ERROR_MARK;
|
|
unsigned n = converted_orig1 ? nelts : refnelts;
|
|
tree_vector_builder vec (converted_orig1
|
|
? type : perm_type, n, 1);
|
|
for (unsigned i = 0; i < n; ++i)
|
|
if (i < nelts && constants[i])
|
|
vec.quick_push (constants[i]);
|
|
else
|
|
/* ??? Push a don't-care value. */
|
|
vec.quick_push (one_constant);
|
|
orig[1] = vec.build ();
|
|
}
|
|
tree blend_op2 = NULL_TREE;
|
|
if (converted_orig1)
|
|
{
|
|
/* Make sure we can do a blend in the target type. */
|
|
vec_perm_builder sel (nelts, nelts, 1);
|
|
for (i = 0; i < elts.length (); ++i)
|
|
sel.quick_push (elts[i].first
|
|
? elts[i].second + nelts : i);
|
|
vec_perm_indices indices (sel, 2, nelts);
|
|
if (!can_vec_perm_const_p (TYPE_MODE (type), indices))
|
|
return false;
|
|
mask_type
|
|
= build_vector_type (build_nonstandard_integer_type (elem_size, 1),
|
|
nelts);
|
|
if (GET_MODE_CLASS (TYPE_MODE (mask_type)) != MODE_VECTOR_INT
|
|
|| maybe_ne (GET_MODE_SIZE (TYPE_MODE (mask_type)),
|
|
GET_MODE_SIZE (TYPE_MODE (type))))
|
|
return false;
|
|
blend_op2 = vec_perm_indices_to_tree (mask_type, indices);
|
|
}
|
|
tree orig1_for_perm
|
|
= converted_orig1 ? build_zero_cst (perm_type) : orig[1];
|
|
tree res = gimple_build (&stmts, VEC_PERM_EXPR, perm_type,
|
|
orig[0], orig1_for_perm, op2);
|
|
if (nelts != refnelts)
|
|
res = gimple_build (&stmts, BIT_FIELD_REF,
|
|
conv_code != ERROR_MARK ? conv_src_type : type,
|
|
res, TYPE_SIZE (type), bitsize_zero_node);
|
|
if (conv_code != ERROR_MARK)
|
|
res = gimple_build (&stmts, conv_code, type, res);
|
|
else if (!useless_type_conversion_p (type, TREE_TYPE (res)))
|
|
{
|
|
gcc_assert (known_eq (TYPE_VECTOR_SUBPARTS (type),
|
|
TYPE_VECTOR_SUBPARTS (perm_type))
|
|
&& useless_type_conversion_p (TREE_TYPE (type),
|
|
TREE_TYPE (perm_type)));
|
|
res = gimple_build (&stmts, VIEW_CONVERT_EXPR, type, res);
|
|
}
|
|
/* Blend in the actual constant. */
|
|
if (converted_orig1)
|
|
res = gimple_build (&stmts, VEC_PERM_EXPR, type,
|
|
res, orig[1], blend_op2);
|
|
gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT);
|
|
gimple_assign_set_rhs_with_ops (gsi, SSA_NAME, res);
|
|
}
|
|
update_stmt (gsi_stmt (*gsi));
|
|
return true;
|
|
}
|
|
|
|
|
|
/* Rewrite the vector load at *GSI to component-wise loads if the load
|
|
is only used in BIT_FIELD_REF extractions with eventual intermediate
|
|
widening. */
|
|
|
|
static void
|
|
optimize_vector_load (gimple_stmt_iterator *gsi)
|
|
{
|
|
gimple *stmt = gsi_stmt (*gsi);
|
|
tree lhs = gimple_assign_lhs (stmt);
|
|
tree rhs = gimple_assign_rhs1 (stmt);
|
|
|
|
/* Gather BIT_FIELD_REFs to rewrite, looking through
|
|
VEC_UNPACK_{LO,HI}_EXPR. */
|
|
use_operand_p use_p;
|
|
imm_use_iterator iter;
|
|
bool rewrite = true;
|
|
auto_vec<gimple *, 8> bf_stmts;
|
|
auto_vec<tree, 8> worklist;
|
|
worklist.quick_push (lhs);
|
|
do
|
|
{
|
|
tree def = worklist.pop ();
|
|
unsigned HOST_WIDE_INT def_eltsize
|
|
= TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (TREE_TYPE (def))));
|
|
FOR_EACH_IMM_USE_FAST (use_p, iter, def)
|
|
{
|
|
gimple *use_stmt = USE_STMT (use_p);
|
|
if (is_gimple_debug (use_stmt))
|
|
continue;
|
|
if (!is_gimple_assign (use_stmt))
|
|
{
|
|
rewrite = false;
|
|
break;
|
|
}
|
|
enum tree_code use_code = gimple_assign_rhs_code (use_stmt);
|
|
tree use_rhs = gimple_assign_rhs1 (use_stmt);
|
|
if (use_code == BIT_FIELD_REF
|
|
&& TREE_OPERAND (use_rhs, 0) == def
|
|
/* If its on the VEC_UNPACK_{HI,LO}_EXPR
|
|
def need to verify it is element aligned. */
|
|
&& (def == lhs
|
|
|| (known_eq (bit_field_size (use_rhs), def_eltsize)
|
|
&& constant_multiple_p (bit_field_offset (use_rhs),
|
|
def_eltsize))))
|
|
{
|
|
bf_stmts.safe_push (use_stmt);
|
|
continue;
|
|
}
|
|
/* Walk through one level of VEC_UNPACK_{LO,HI}_EXPR. */
|
|
if (def == lhs
|
|
&& (use_code == VEC_UNPACK_HI_EXPR
|
|
|| use_code == VEC_UNPACK_LO_EXPR)
|
|
&& use_rhs == lhs)
|
|
{
|
|
worklist.safe_push (gimple_assign_lhs (use_stmt));
|
|
continue;
|
|
}
|
|
rewrite = false;
|
|
break;
|
|
}
|
|
if (!rewrite)
|
|
break;
|
|
}
|
|
while (!worklist.is_empty ());
|
|
|
|
if (!rewrite)
|
|
{
|
|
gsi_next (gsi);
|
|
return;
|
|
}
|
|
/* We now have all ultimate uses of the load to rewrite in bf_stmts. */
|
|
|
|
/* Prepare the original ref to be wrapped in adjusted BIT_FIELD_REFs.
|
|
For TARGET_MEM_REFs we have to separate the LEA from the reference. */
|
|
tree load_rhs = rhs;
|
|
if (TREE_CODE (load_rhs) == TARGET_MEM_REF)
|
|
{
|
|
if (TREE_CODE (TREE_OPERAND (load_rhs, 0)) == ADDR_EXPR)
|
|
mark_addressable (TREE_OPERAND (TREE_OPERAND (load_rhs, 0), 0));
|
|
tree tem = make_ssa_name (TREE_TYPE (TREE_OPERAND (load_rhs, 0)));
|
|
gimple *new_stmt
|
|
= gimple_build_assign (tem, build1 (ADDR_EXPR, TREE_TYPE (tem),
|
|
unshare_expr (load_rhs)));
|
|
gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT);
|
|
load_rhs = build2_loc (EXPR_LOCATION (load_rhs),
|
|
MEM_REF, TREE_TYPE (load_rhs), tem,
|
|
build_int_cst
|
|
(TREE_TYPE (TREE_OPERAND (load_rhs, 1)), 0));
|
|
}
|
|
|
|
/* Rewrite the BIT_FIELD_REFs to be actual loads, re-emitting them at
|
|
the place of the original load. */
|
|
for (gimple *use_stmt : bf_stmts)
|
|
{
|
|
tree bfr = gimple_assign_rhs1 (use_stmt);
|
|
tree new_rhs = unshare_expr (load_rhs);
|
|
if (TREE_OPERAND (bfr, 0) != lhs)
|
|
{
|
|
/* When the BIT_FIELD_REF is on the promoted vector we have to
|
|
adjust it and emit a conversion afterwards. */
|
|
gimple *def_stmt
|
|
= SSA_NAME_DEF_STMT (TREE_OPERAND (bfr, 0));
|
|
enum tree_code def_code
|
|
= gimple_assign_rhs_code (def_stmt);
|
|
|
|
/* The adjusted BIT_FIELD_REF is of the promotion source
|
|
vector size and at half of the offset... */
|
|
new_rhs = fold_build3 (BIT_FIELD_REF,
|
|
TREE_TYPE (TREE_TYPE (lhs)),
|
|
new_rhs,
|
|
TYPE_SIZE (TREE_TYPE (TREE_TYPE (lhs))),
|
|
size_binop (EXACT_DIV_EXPR,
|
|
TREE_OPERAND (bfr, 2),
|
|
bitsize_int (2)));
|
|
/* ... and offsetted by half of the vector if VEC_UNPACK_HI_EXPR. */
|
|
if (def_code == (!BYTES_BIG_ENDIAN
|
|
? VEC_UNPACK_HI_EXPR : VEC_UNPACK_LO_EXPR))
|
|
TREE_OPERAND (new_rhs, 2)
|
|
= size_binop (PLUS_EXPR, TREE_OPERAND (new_rhs, 2),
|
|
size_binop (EXACT_DIV_EXPR,
|
|
TYPE_SIZE (TREE_TYPE (lhs)),
|
|
bitsize_int (2)));
|
|
tree tem = make_ssa_name (TREE_TYPE (TREE_TYPE (lhs)));
|
|
gimple *new_stmt = gimple_build_assign (tem, new_rhs);
|
|
location_t loc = gimple_location (use_stmt);
|
|
gimple_set_location (new_stmt, loc);
|
|
gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT);
|
|
/* Perform scalar promotion. */
|
|
new_stmt = gimple_build_assign (gimple_assign_lhs (use_stmt),
|
|
NOP_EXPR, tem);
|
|
gimple_set_location (new_stmt, loc);
|
|
gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT);
|
|
}
|
|
else
|
|
{
|
|
/* When the BIT_FIELD_REF is on the original load result
|
|
we can just wrap that. */
|
|
tree new_rhs = fold_build3 (BIT_FIELD_REF, TREE_TYPE (bfr),
|
|
unshare_expr (load_rhs),
|
|
TREE_OPERAND (bfr, 1),
|
|
TREE_OPERAND (bfr, 2));
|
|
gimple *new_stmt = gimple_build_assign (gimple_assign_lhs (use_stmt),
|
|
new_rhs);
|
|
location_t loc = gimple_location (use_stmt);
|
|
gimple_set_location (new_stmt, loc);
|
|
gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT);
|
|
}
|
|
gimple_stmt_iterator gsi2 = gsi_for_stmt (use_stmt);
|
|
unlink_stmt_vdef (use_stmt);
|
|
gsi_remove (&gsi2, true);
|
|
}
|
|
|
|
/* Finally get rid of the intermediate stmts. */
|
|
gimple *use_stmt;
|
|
FOR_EACH_IMM_USE_STMT (use_stmt, iter, lhs)
|
|
{
|
|
if (is_gimple_debug (use_stmt))
|
|
{
|
|
if (gimple_debug_bind_p (use_stmt))
|
|
{
|
|
gimple_debug_bind_reset_value (use_stmt);
|
|
update_stmt (use_stmt);
|
|
}
|
|
continue;
|
|
}
|
|
gimple_stmt_iterator gsi2 = gsi_for_stmt (use_stmt);
|
|
unlink_stmt_vdef (use_stmt);
|
|
release_defs (use_stmt);
|
|
gsi_remove (&gsi2, true);
|
|
}
|
|
/* And the original load. */
|
|
release_defs (stmt);
|
|
gsi_remove (gsi, true);
|
|
}
|
|
|
|
|
|
/* Primitive "lattice" function for gimple_simplify. */
|
|
|
|
static tree
|
|
fwprop_ssa_val (tree name)
|
|
{
|
|
/* First valueize NAME. */
|
|
if (TREE_CODE (name) == SSA_NAME
|
|
&& SSA_NAME_VERSION (name) < lattice.length ())
|
|
{
|
|
tree val = lattice[SSA_NAME_VERSION (name)];
|
|
if (val)
|
|
name = val;
|
|
}
|
|
/* We continue matching along SSA use-def edges for SSA names
|
|
that are not single-use. Currently there are no patterns
|
|
that would cause any issues with that. */
|
|
return name;
|
|
}
|
|
|
|
/* Main entry point for the forward propagation and statement combine
|
|
optimizer. */
|
|
|
|
namespace {
|
|
|
|
const pass_data pass_data_forwprop =
|
|
{
|
|
GIMPLE_PASS, /* type */
|
|
"forwprop", /* name */
|
|
OPTGROUP_NONE, /* optinfo_flags */
|
|
TV_TREE_FORWPROP, /* tv_id */
|
|
( PROP_cfg | PROP_ssa ), /* properties_required */
|
|
0, /* properties_provided */
|
|
0, /* properties_destroyed */
|
|
0, /* todo_flags_start */
|
|
TODO_update_ssa, /* todo_flags_finish */
|
|
};
|
|
|
|
class pass_forwprop : public gimple_opt_pass
|
|
{
|
|
public:
|
|
pass_forwprop (gcc::context *ctxt)
|
|
: gimple_opt_pass (pass_data_forwprop, ctxt)
|
|
{}
|
|
|
|
/* opt_pass methods: */
|
|
opt_pass * clone () { return new pass_forwprop (m_ctxt); }
|
|
virtual bool gate (function *) { return flag_tree_forwprop; }
|
|
virtual unsigned int execute (function *);
|
|
|
|
}; // class pass_forwprop
|
|
|
|
unsigned int
|
|
pass_forwprop::execute (function *fun)
|
|
{
|
|
unsigned int todoflags = 0;
|
|
|
|
cfg_changed = false;
|
|
|
|
/* Combine stmts with the stmts defining their operands. Do that
|
|
in an order that guarantees visiting SSA defs before SSA uses. */
|
|
lattice.create (num_ssa_names);
|
|
lattice.quick_grow_cleared (num_ssa_names);
|
|
int *postorder = XNEWVEC (int, n_basic_blocks_for_fn (fun));
|
|
int postorder_num = pre_and_rev_post_order_compute_fn (cfun, NULL,
|
|
postorder, false);
|
|
auto_vec<gimple *, 4> to_fixup;
|
|
auto_vec<gimple *, 32> to_remove;
|
|
to_purge = BITMAP_ALLOC (NULL);
|
|
for (int i = 0; i < postorder_num; ++i)
|
|
{
|
|
gimple_stmt_iterator gsi;
|
|
basic_block bb = BASIC_BLOCK_FOR_FN (fun, postorder[i]);
|
|
|
|
/* Record degenerate PHIs in the lattice. */
|
|
for (gphi_iterator si = gsi_start_phis (bb); !gsi_end_p (si);
|
|
gsi_next (&si))
|
|
{
|
|
gphi *phi = si.phi ();
|
|
tree res = gimple_phi_result (phi);
|
|
if (virtual_operand_p (res))
|
|
continue;
|
|
|
|
use_operand_p use_p;
|
|
ssa_op_iter it;
|
|
tree first = NULL_TREE;
|
|
bool all_same = true;
|
|
FOR_EACH_PHI_ARG (use_p, phi, it, SSA_OP_USE)
|
|
{
|
|
tree use = USE_FROM_PTR (use_p);
|
|
if (! first)
|
|
first = use;
|
|
else if (! operand_equal_p (first, use, 0))
|
|
{
|
|
all_same = false;
|
|
break;
|
|
}
|
|
}
|
|
if (all_same)
|
|
{
|
|
if (may_propagate_copy (res, first))
|
|
to_remove.safe_push (phi);
|
|
fwprop_set_lattice_val (res, first);
|
|
}
|
|
}
|
|
|
|
/* Apply forward propagation to all stmts in the basic-block.
|
|
Note we update GSI within the loop as necessary. */
|
|
for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); )
|
|
{
|
|
gimple *stmt = gsi_stmt (gsi);
|
|
tree lhs, rhs;
|
|
enum tree_code code;
|
|
|
|
if (!is_gimple_assign (stmt))
|
|
{
|
|
gsi_next (&gsi);
|
|
continue;
|
|
}
|
|
|
|
lhs = gimple_assign_lhs (stmt);
|
|
rhs = gimple_assign_rhs1 (stmt);
|
|
code = gimple_assign_rhs_code (stmt);
|
|
if (TREE_CODE (lhs) != SSA_NAME
|
|
|| has_zero_uses (lhs))
|
|
{
|
|
gsi_next (&gsi);
|
|
continue;
|
|
}
|
|
|
|
/* If this statement sets an SSA_NAME to an address,
|
|
try to propagate the address into the uses of the SSA_NAME. */
|
|
if ((code == ADDR_EXPR
|
|
/* Handle pointer conversions on invariant addresses
|
|
as well, as this is valid gimple. */
|
|
|| (CONVERT_EXPR_CODE_P (code)
|
|
&& TREE_CODE (rhs) == ADDR_EXPR
|
|
&& POINTER_TYPE_P (TREE_TYPE (lhs))))
|
|
&& TREE_CODE (TREE_OPERAND (rhs, 0)) != TARGET_MEM_REF)
|
|
{
|
|
tree base = get_base_address (TREE_OPERAND (rhs, 0));
|
|
if ((!base
|
|
|| !DECL_P (base)
|
|
|| decl_address_invariant_p (base))
|
|
&& !stmt_references_abnormal_ssa_name (stmt)
|
|
&& forward_propagate_addr_expr (lhs, rhs, true))
|
|
{
|
|
fwprop_invalidate_lattice (gimple_get_lhs (stmt));
|
|
release_defs (stmt);
|
|
gsi_remove (&gsi, true);
|
|
}
|
|
else
|
|
gsi_next (&gsi);
|
|
}
|
|
else if (code == POINTER_PLUS_EXPR)
|
|
{
|
|
tree off = gimple_assign_rhs2 (stmt);
|
|
if (TREE_CODE (off) == INTEGER_CST
|
|
&& can_propagate_from (stmt)
|
|
&& !simple_iv_increment_p (stmt)
|
|
/* ??? Better adjust the interface to that function
|
|
instead of building new trees here. */
|
|
&& forward_propagate_addr_expr
|
|
(lhs,
|
|
build1_loc (gimple_location (stmt),
|
|
ADDR_EXPR, TREE_TYPE (rhs),
|
|
fold_build2 (MEM_REF,
|
|
TREE_TYPE (TREE_TYPE (rhs)),
|
|
rhs,
|
|
fold_convert (ptr_type_node,
|
|
off))), true))
|
|
{
|
|
fwprop_invalidate_lattice (gimple_get_lhs (stmt));
|
|
release_defs (stmt);
|
|
gsi_remove (&gsi, true);
|
|
}
|
|
else if (is_gimple_min_invariant (rhs))
|
|
{
|
|
/* Make sure to fold &a[0] + off_1 here. */
|
|
fold_stmt_inplace (&gsi);
|
|
update_stmt (stmt);
|
|
if (gimple_assign_rhs_code (stmt) == POINTER_PLUS_EXPR)
|
|
gsi_next (&gsi);
|
|
}
|
|
else
|
|
gsi_next (&gsi);
|
|
}
|
|
else if (TREE_CODE (TREE_TYPE (lhs)) == COMPLEX_TYPE
|
|
&& gimple_assign_load_p (stmt)
|
|
&& !gimple_has_volatile_ops (stmt)
|
|
&& (TREE_CODE (gimple_assign_rhs1 (stmt))
|
|
!= TARGET_MEM_REF)
|
|
&& !stmt_can_throw_internal (cfun, stmt))
|
|
{
|
|
/* Rewrite loads used only in real/imagpart extractions to
|
|
component-wise loads. */
|
|
use_operand_p use_p;
|
|
imm_use_iterator iter;
|
|
bool rewrite = true;
|
|
FOR_EACH_IMM_USE_FAST (use_p, iter, lhs)
|
|
{
|
|
gimple *use_stmt = USE_STMT (use_p);
|
|
if (is_gimple_debug (use_stmt))
|
|
continue;
|
|
if (!is_gimple_assign (use_stmt)
|
|
|| (gimple_assign_rhs_code (use_stmt) != REALPART_EXPR
|
|
&& gimple_assign_rhs_code (use_stmt) != IMAGPART_EXPR)
|
|
|| TREE_OPERAND (gimple_assign_rhs1 (use_stmt), 0) != lhs)
|
|
{
|
|
rewrite = false;
|
|
break;
|
|
}
|
|
}
|
|
if (rewrite)
|
|
{
|
|
gimple *use_stmt;
|
|
FOR_EACH_IMM_USE_STMT (use_stmt, iter, lhs)
|
|
{
|
|
if (is_gimple_debug (use_stmt))
|
|
{
|
|
if (gimple_debug_bind_p (use_stmt))
|
|
{
|
|
gimple_debug_bind_reset_value (use_stmt);
|
|
update_stmt (use_stmt);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
tree new_rhs = build1 (gimple_assign_rhs_code (use_stmt),
|
|
TREE_TYPE (TREE_TYPE (rhs)),
|
|
unshare_expr (rhs));
|
|
gimple *new_stmt
|
|
= gimple_build_assign (gimple_assign_lhs (use_stmt),
|
|
new_rhs);
|
|
|
|
location_t loc = gimple_location (use_stmt);
|
|
gimple_set_location (new_stmt, loc);
|
|
gimple_stmt_iterator gsi2 = gsi_for_stmt (use_stmt);
|
|
unlink_stmt_vdef (use_stmt);
|
|
gsi_remove (&gsi2, true);
|
|
|
|
gsi_insert_before (&gsi, new_stmt, GSI_SAME_STMT);
|
|
}
|
|
|
|
release_defs (stmt);
|
|
gsi_remove (&gsi, true);
|
|
}
|
|
else
|
|
gsi_next (&gsi);
|
|
}
|
|
else if (TREE_CODE (TREE_TYPE (lhs)) == VECTOR_TYPE
|
|
&& (TYPE_MODE (TREE_TYPE (lhs)) == BLKmode
|
|
/* After vector lowering rewrite all loads, but
|
|
initially do not since this conflicts with
|
|
vector CONSTRUCTOR to shuffle optimization. */
|
|
|| (fun->curr_properties & PROP_gimple_lvec))
|
|
&& gimple_assign_load_p (stmt)
|
|
&& !gimple_has_volatile_ops (stmt)
|
|
&& !stmt_can_throw_internal (cfun, stmt)
|
|
&& (!VAR_P (rhs) || !DECL_HARD_REGISTER (rhs)))
|
|
optimize_vector_load (&gsi);
|
|
|
|
else if (code == COMPLEX_EXPR)
|
|
{
|
|
/* Rewrite stores of a single-use complex build expression
|
|
to component-wise stores. */
|
|
use_operand_p use_p;
|
|
gimple *use_stmt;
|
|
if (single_imm_use (lhs, &use_p, &use_stmt)
|
|
&& gimple_store_p (use_stmt)
|
|
&& !gimple_has_volatile_ops (use_stmt)
|
|
&& is_gimple_assign (use_stmt)
|
|
&& (TREE_CODE (gimple_assign_lhs (use_stmt))
|
|
!= TARGET_MEM_REF))
|
|
{
|
|
tree use_lhs = gimple_assign_lhs (use_stmt);
|
|
if (auto_var_p (use_lhs))
|
|
DECL_NOT_GIMPLE_REG_P (use_lhs) = 1;
|
|
tree new_lhs = build1 (REALPART_EXPR,
|
|
TREE_TYPE (TREE_TYPE (use_lhs)),
|
|
unshare_expr (use_lhs));
|
|
gimple *new_stmt = gimple_build_assign (new_lhs, rhs);
|
|
location_t loc = gimple_location (use_stmt);
|
|
gimple_set_location (new_stmt, loc);
|
|
gimple_set_vuse (new_stmt, gimple_vuse (use_stmt));
|
|
gimple_set_vdef (new_stmt, make_ssa_name (gimple_vop (cfun)));
|
|
SSA_NAME_DEF_STMT (gimple_vdef (new_stmt)) = new_stmt;
|
|
gimple_set_vuse (use_stmt, gimple_vdef (new_stmt));
|
|
gimple_stmt_iterator gsi2 = gsi_for_stmt (use_stmt);
|
|
gsi_insert_before (&gsi2, new_stmt, GSI_SAME_STMT);
|
|
|
|
new_lhs = build1 (IMAGPART_EXPR,
|
|
TREE_TYPE (TREE_TYPE (use_lhs)),
|
|
unshare_expr (use_lhs));
|
|
gimple_assign_set_lhs (use_stmt, new_lhs);
|
|
gimple_assign_set_rhs1 (use_stmt, gimple_assign_rhs2 (stmt));
|
|
update_stmt (use_stmt);
|
|
|
|
release_defs (stmt);
|
|
gsi_remove (&gsi, true);
|
|
}
|
|
else
|
|
gsi_next (&gsi);
|
|
}
|
|
else if (code == CONSTRUCTOR
|
|
&& VECTOR_TYPE_P (TREE_TYPE (rhs))
|
|
&& TYPE_MODE (TREE_TYPE (rhs)) == BLKmode
|
|
&& CONSTRUCTOR_NELTS (rhs) > 0
|
|
&& (!VECTOR_TYPE_P (TREE_TYPE (CONSTRUCTOR_ELT (rhs, 0)->value))
|
|
|| (TYPE_MODE (TREE_TYPE (CONSTRUCTOR_ELT (rhs, 0)->value))
|
|
!= BLKmode)))
|
|
{
|
|
/* Rewrite stores of a single-use vector constructors
|
|
to component-wise stores if the mode isn't supported. */
|
|
use_operand_p use_p;
|
|
gimple *use_stmt;
|
|
if (single_imm_use (lhs, &use_p, &use_stmt)
|
|
&& gimple_store_p (use_stmt)
|
|
&& !gimple_has_volatile_ops (use_stmt)
|
|
&& !stmt_can_throw_internal (cfun, use_stmt)
|
|
&& is_gimple_assign (use_stmt)
|
|
&& (TREE_CODE (gimple_assign_lhs (use_stmt))
|
|
!= TARGET_MEM_REF))
|
|
{
|
|
tree elt_t = TREE_TYPE (CONSTRUCTOR_ELT (rhs, 0)->value);
|
|
unsigned HOST_WIDE_INT elt_w
|
|
= tree_to_uhwi (TYPE_SIZE (elt_t));
|
|
unsigned HOST_WIDE_INT n
|
|
= tree_to_uhwi (TYPE_SIZE (TREE_TYPE (rhs)));
|
|
tree use_lhs = gimple_assign_lhs (use_stmt);
|
|
if (auto_var_p (use_lhs))
|
|
DECL_NOT_GIMPLE_REG_P (use_lhs) = 1;
|
|
for (unsigned HOST_WIDE_INT bi = 0; bi < n; bi += elt_w)
|
|
{
|
|
unsigned HOST_WIDE_INT ci = bi / elt_w;
|
|
tree new_rhs;
|
|
if (ci < CONSTRUCTOR_NELTS (rhs))
|
|
new_rhs = CONSTRUCTOR_ELT (rhs, ci)->value;
|
|
else
|
|
new_rhs = build_zero_cst (elt_t);
|
|
tree new_lhs = build3 (BIT_FIELD_REF,
|
|
elt_t,
|
|
unshare_expr (use_lhs),
|
|
bitsize_int (elt_w),
|
|
bitsize_int (bi));
|
|
gimple *new_stmt = gimple_build_assign (new_lhs, new_rhs);
|
|
location_t loc = gimple_location (use_stmt);
|
|
gimple_set_location (new_stmt, loc);
|
|
gimple_set_vuse (new_stmt, gimple_vuse (use_stmt));
|
|
gimple_set_vdef (new_stmt,
|
|
make_ssa_name (gimple_vop (cfun)));
|
|
SSA_NAME_DEF_STMT (gimple_vdef (new_stmt)) = new_stmt;
|
|
gimple_set_vuse (use_stmt, gimple_vdef (new_stmt));
|
|
gimple_stmt_iterator gsi2 = gsi_for_stmt (use_stmt);
|
|
gsi_insert_before (&gsi2, new_stmt, GSI_SAME_STMT);
|
|
}
|
|
gimple_stmt_iterator gsi2 = gsi_for_stmt (use_stmt);
|
|
unlink_stmt_vdef (use_stmt);
|
|
release_defs (use_stmt);
|
|
gsi_remove (&gsi2, true);
|
|
release_defs (stmt);
|
|
gsi_remove (&gsi, true);
|
|
}
|
|
else
|
|
gsi_next (&gsi);
|
|
}
|
|
else
|
|
gsi_next (&gsi);
|
|
}
|
|
|
|
/* Combine stmts with the stmts defining their operands.
|
|
Note we update GSI within the loop as necessary. */
|
|
for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
|
|
{
|
|
gimple *stmt = gsi_stmt (gsi);
|
|
|
|
/* Mark stmt as potentially needing revisiting. */
|
|
gimple_set_plf (stmt, GF_PLF_1, false);
|
|
|
|
/* Substitute from our lattice. We need to do so only once. */
|
|
bool substituted_p = false;
|
|
use_operand_p usep;
|
|
ssa_op_iter iter;
|
|
FOR_EACH_SSA_USE_OPERAND (usep, stmt, iter, SSA_OP_USE)
|
|
{
|
|
tree use = USE_FROM_PTR (usep);
|
|
tree val = fwprop_ssa_val (use);
|
|
if (val && val != use && may_propagate_copy (use, val))
|
|
{
|
|
propagate_value (usep, val);
|
|
substituted_p = true;
|
|
}
|
|
}
|
|
if (substituted_p
|
|
&& is_gimple_assign (stmt)
|
|
&& gimple_assign_rhs_code (stmt) == ADDR_EXPR)
|
|
recompute_tree_invariant_for_addr_expr (gimple_assign_rhs1 (stmt));
|
|
|
|
bool changed;
|
|
do
|
|
{
|
|
gimple *orig_stmt = stmt = gsi_stmt (gsi);
|
|
bool was_noreturn = (is_gimple_call (stmt)
|
|
&& gimple_call_noreturn_p (stmt));
|
|
changed = false;
|
|
|
|
if (fold_stmt (&gsi, fwprop_ssa_val))
|
|
{
|
|
changed = true;
|
|
stmt = gsi_stmt (gsi);
|
|
/* Cleanup the CFG if we simplified a condition to
|
|
true or false. */
|
|
if (gcond *cond = dyn_cast <gcond *> (stmt))
|
|
if (gimple_cond_true_p (cond)
|
|
|| gimple_cond_false_p (cond))
|
|
cfg_changed = true;
|
|
}
|
|
|
|
if (changed || substituted_p)
|
|
{
|
|
if (maybe_clean_or_replace_eh_stmt (orig_stmt, stmt))
|
|
bitmap_set_bit (to_purge, bb->index);
|
|
if (!was_noreturn
|
|
&& is_gimple_call (stmt) && gimple_call_noreturn_p (stmt))
|
|
to_fixup.safe_push (stmt);
|
|
update_stmt (stmt);
|
|
substituted_p = false;
|
|
}
|
|
|
|
switch (gimple_code (stmt))
|
|
{
|
|
case GIMPLE_ASSIGN:
|
|
{
|
|
tree rhs1 = gimple_assign_rhs1 (stmt);
|
|
enum tree_code code = gimple_assign_rhs_code (stmt);
|
|
|
|
if (code == COND_EXPR)
|
|
{
|
|
/* In this case the entire COND_EXPR is in rhs1. */
|
|
if (forward_propagate_into_cond (&gsi))
|
|
{
|
|
changed = true;
|
|
stmt = gsi_stmt (gsi);
|
|
}
|
|
}
|
|
else if (TREE_CODE_CLASS (code) == tcc_comparison)
|
|
{
|
|
int did_something;
|
|
did_something = forward_propagate_into_comparison (&gsi);
|
|
if (maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (gsi)))
|
|
bitmap_set_bit (to_purge, bb->index);
|
|
if (did_something == 2)
|
|
cfg_changed = true;
|
|
changed = did_something != 0;
|
|
}
|
|
else if ((code == PLUS_EXPR
|
|
|| code == BIT_IOR_EXPR
|
|
|| code == BIT_XOR_EXPR)
|
|
&& simplify_rotate (&gsi))
|
|
changed = true;
|
|
else if (code == VEC_PERM_EXPR)
|
|
{
|
|
int did_something = simplify_permutation (&gsi);
|
|
if (did_something == 2)
|
|
cfg_changed = true;
|
|
changed = did_something != 0;
|
|
}
|
|
else if (code == BIT_FIELD_REF)
|
|
changed = simplify_bitfield_ref (&gsi);
|
|
else if (code == CONSTRUCTOR
|
|
&& TREE_CODE (TREE_TYPE (rhs1)) == VECTOR_TYPE)
|
|
changed = simplify_vector_constructor (&gsi);
|
|
else if (code == ARRAY_REF)
|
|
changed = simplify_count_trailing_zeroes (&gsi);
|
|
break;
|
|
}
|
|
|
|
case GIMPLE_SWITCH:
|
|
changed = simplify_gimple_switch (as_a <gswitch *> (stmt));
|
|
break;
|
|
|
|
case GIMPLE_COND:
|
|
{
|
|
int did_something = forward_propagate_into_gimple_cond
|
|
(as_a <gcond *> (stmt));
|
|
if (did_something == 2)
|
|
cfg_changed = true;
|
|
changed = did_something != 0;
|
|
break;
|
|
}
|
|
|
|
case GIMPLE_CALL:
|
|
{
|
|
tree callee = gimple_call_fndecl (stmt);
|
|
if (callee != NULL_TREE
|
|
&& fndecl_built_in_p (callee, BUILT_IN_NORMAL))
|
|
changed = simplify_builtin_call (&gsi, callee);
|
|
break;
|
|
}
|
|
|
|
default:;
|
|
}
|
|
|
|
if (changed)
|
|
{
|
|
/* If the stmt changed then re-visit it and the statements
|
|
inserted before it. */
|
|
for (; !gsi_end_p (gsi); gsi_prev (&gsi))
|
|
if (gimple_plf (gsi_stmt (gsi), GF_PLF_1))
|
|
break;
|
|
if (gsi_end_p (gsi))
|
|
gsi = gsi_start_bb (bb);
|
|
else
|
|
gsi_next (&gsi);
|
|
}
|
|
}
|
|
while (changed);
|
|
|
|
/* Stmt no longer needs to be revisited. */
|
|
stmt = gsi_stmt (gsi);
|
|
gcc_checking_assert (!gimple_plf (stmt, GF_PLF_1));
|
|
gimple_set_plf (stmt, GF_PLF_1, true);
|
|
|
|
/* Fill up the lattice. */
|
|
if (gimple_assign_single_p (stmt))
|
|
{
|
|
tree lhs = gimple_assign_lhs (stmt);
|
|
tree rhs = gimple_assign_rhs1 (stmt);
|
|
if (TREE_CODE (lhs) == SSA_NAME)
|
|
{
|
|
tree val = lhs;
|
|
if (TREE_CODE (rhs) == SSA_NAME)
|
|
val = fwprop_ssa_val (rhs);
|
|
else if (is_gimple_min_invariant (rhs))
|
|
val = rhs;
|
|
/* If we can propagate the lattice-value mark the
|
|
stmt for removal. */
|
|
if (val != lhs
|
|
&& may_propagate_copy (lhs, val))
|
|
to_remove.safe_push (stmt);
|
|
fwprop_set_lattice_val (lhs, val);
|
|
}
|
|
}
|
|
else if (gimple_nop_p (stmt))
|
|
to_remove.safe_push (stmt);
|
|
}
|
|
|
|
/* Substitute in destination PHI arguments. */
|
|
edge_iterator ei;
|
|
edge e;
|
|
FOR_EACH_EDGE (e, ei, bb->succs)
|
|
for (gphi_iterator gsi = gsi_start_phis (e->dest);
|
|
!gsi_end_p (gsi); gsi_next (&gsi))
|
|
{
|
|
gphi *phi = gsi.phi ();
|
|
use_operand_p use_p = PHI_ARG_DEF_PTR_FROM_EDGE (phi, e);
|
|
tree arg = USE_FROM_PTR (use_p);
|
|
if (TREE_CODE (arg) != SSA_NAME
|
|
|| virtual_operand_p (arg))
|
|
continue;
|
|
tree val = fwprop_ssa_val (arg);
|
|
if (val != arg
|
|
&& may_propagate_copy (arg, val))
|
|
propagate_value (use_p, val);
|
|
}
|
|
}
|
|
free (postorder);
|
|
lattice.release ();
|
|
|
|
/* Remove stmts in reverse order to make debug stmt creation possible. */
|
|
while (!to_remove.is_empty())
|
|
{
|
|
gimple *stmt = to_remove.pop ();
|
|
if (dump_file && (dump_flags & TDF_DETAILS))
|
|
{
|
|
fprintf (dump_file, "Removing dead stmt ");
|
|
print_gimple_stmt (dump_file, stmt, 0);
|
|
fprintf (dump_file, "\n");
|
|
}
|
|
gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
|
|
if (gimple_code (stmt) == GIMPLE_PHI)
|
|
remove_phi_node (&gsi, true);
|
|
else
|
|
{
|
|
unlink_stmt_vdef (stmt);
|
|
gsi_remove (&gsi, true);
|
|
release_defs (stmt);
|
|
}
|
|
}
|
|
|
|
/* Fixup stmts that became noreturn calls. This may require splitting
|
|
blocks and thus isn't possible during the walk. Do this
|
|
in reverse order so we don't inadvertedly remove a stmt we want to
|
|
fixup by visiting a dominating now noreturn call first. */
|
|
while (!to_fixup.is_empty ())
|
|
{
|
|
gimple *stmt = to_fixup.pop ();
|
|
if (dump_file && dump_flags & TDF_DETAILS)
|
|
{
|
|
fprintf (dump_file, "Fixing up noreturn call ");
|
|
print_gimple_stmt (dump_file, stmt, 0);
|
|
fprintf (dump_file, "\n");
|
|
}
|
|
cfg_changed |= fixup_noreturn_call (stmt);
|
|
}
|
|
|
|
cfg_changed |= gimple_purge_all_dead_eh_edges (to_purge);
|
|
BITMAP_FREE (to_purge);
|
|
|
|
if (cfg_changed)
|
|
todoflags |= TODO_cleanup_cfg;
|
|
|
|
return todoflags;
|
|
}
|
|
|
|
} // anon namespace
|
|
|
|
gimple_opt_pass *
|
|
make_pass_forwprop (gcc::context *ctxt)
|
|
{
|
|
return new pass_forwprop (ctxt);
|
|
}
|