83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
/* Header file for SSA loop optimizations.
|
|
Copyright (C) 2013-2016 Free Software Foundation, Inc.
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free
|
|
Software Foundation; either version 3, or (at your option) any later
|
|
version.
|
|
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GCC; see the file COPYING3. If not see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef GCC_TREE_SSA_LOOP_H
|
|
#define GCC_TREE_SSA_LOOP_H
|
|
|
|
|
|
/* Affine iv. */
|
|
|
|
struct affine_iv
|
|
{
|
|
/* Iv = BASE + STEP * i. */
|
|
tree base, step;
|
|
|
|
/* True if this iv does not overflow. */
|
|
bool no_overflow;
|
|
};
|
|
|
|
/* Description of number of iterations of a loop. All the expressions inside
|
|
the structure can be evaluated at the end of the loop's preheader
|
|
(and due to ssa form, also anywhere inside the body of the loop). */
|
|
|
|
struct tree_niter_desc
|
|
{
|
|
tree assumptions; /* The boolean expression. If this expression evaluates
|
|
to false, then the other fields in this structure
|
|
should not be used; there is no guarantee that they
|
|
will be correct. */
|
|
tree may_be_zero; /* The boolean expression. If it evaluates to true,
|
|
the loop will exit in the first iteration (i.e.
|
|
its latch will not be executed), even if the niter
|
|
field says otherwise. */
|
|
tree niter; /* The expression giving the number of iterations of
|
|
a loop (provided that assumptions == true and
|
|
may_be_zero == false), more precisely the number
|
|
of executions of the latch of the loop. */
|
|
widest_int max; /* The upper bound on the number of iterations of
|
|
the loop. */
|
|
|
|
/* The simplified shape of the exit condition. The loop exits if
|
|
CONTROL CMP BOUND is false, where CMP is one of NE_EXPR,
|
|
LT_EXPR, or GT_EXPR, and step of CONTROL is positive if CMP is
|
|
LE_EXPR and negative if CMP is GE_EXPR. This information is used
|
|
by loop unrolling. */
|
|
affine_iv control;
|
|
tree bound;
|
|
enum tree_code cmp;
|
|
};
|
|
|
|
extern bool for_each_index (tree *, bool (*) (tree, tree *, void *), void *);
|
|
extern char *get_lsm_tmp_name (tree ref, unsigned n, const char *suffix = NULL);
|
|
extern unsigned tree_num_loop_insns (struct loop *, struct eni_weights *);
|
|
|
|
/* Returns the loop of the statement STMT. */
|
|
|
|
static inline struct loop *
|
|
loop_containing_stmt (gimple *stmt)
|
|
{
|
|
basic_block bb = gimple_bb (stmt);
|
|
if (!bb)
|
|
return NULL;
|
|
|
|
return bb->loop_father;
|
|
}
|
|
|
|
#endif /* GCC_TREE_SSA_LOOP_H */
|