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re PR tree-optimization/70251 (Wrong code with -O3 -march=skylake-avx512.) 

2016-03-22  Richard Biener  <rguenther@suse.de>

	PR middle-end/70251
	* genmatch.c (gen_transform): Adjust last parameter to a three-state
	int...
	(capture::gen_transform): ... to change behavior when substituting
	a condition into cond or not-cond expr context.
	(dt_simplify::gen_1): Adjust.
	* gimple-match-head.c: Include gimplify.h for unshare_expr.
	* match.pd (A + (B vcmp C ? 1 : 0) -> A - (B vcmp C)): Revert
	last change and instead change to
	A + (B vcmp C ? 1 : 0) -> A - (B vcmp C ? -1 : 0).
	(A - (B vcmp C ? 1 : 0) -> A + (B vcmp C)): Likewise.

	* g++.dg/torture/pr70251.C: New testcase.

From-SVN: r234405
This commit is contained in:
Richard Biener 2016-03-22 14:38:42 +00:00 committed by Richard Biener
parent ec613b6634
commit a3ca1bc5bd
6 changed files with 76 additions and 43 deletions
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14
gcc/ChangeLog
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@ -1,3 +1,17 @@
2016-03-22 Richard Biener <rguenther@suse.de>
PR middle-end/70251
* genmatch.c (gen_transform): Adjust last parameter to a three-state
int...
(capture::gen_transform): ... to change behavior when substituting
a condition into cond or not-cond expr context.
(dt_simplify::gen_1): Adjust.
* gimple-match-head.c: Include gimplify.h for unshare_expr.
* match.pd (A + (B vcmp C ? 1 : 0) -> A - (B vcmp C)): Revert
last change and instead change to
A + (B vcmp C ? 1 : 0) -> A - (B vcmp C ? -1 : 0).
(A - (B vcmp C ? 1 : 0) -> A + (B vcmp C)): Likewise.
2016-03-22 Anthony Green <green@moxielogic.com>
* config/moxie/moxiebox.h (CC1_SPEC): Define. Fix endianness

72
gcc/genmatch.c
View File

@ -548,7 +548,7 @@ struct operand {
virtual void gen_transform (FILE *, int, const char *, bool, int,
const char *, capture_info *,
dt_operand ** = 0,
bool = true)
int = 0)
{ gcc_unreachable (); }
};
@ -590,7 +590,7 @@ struct expr : public operand
bool force_single_use;
virtual void gen_transform (FILE *f, int, const char *, bool, int,
const char *, capture_info *,
dt_operand ** = 0, bool = true);
dt_operand ** = 0, int = 0);
};
/* An operator that is represented by native C code. This is always
@ -622,7 +622,7 @@ struct c_expr : public operand
vec<id_tab> ids;
virtual void gen_transform (FILE *f, int, const char *, bool, int,
const char *, capture_info *,
dt_operand ** = 0, bool = true);
dt_operand ** = 0, int = 0);
};
/* A wrapper around another operand that captures its value. */
@ -637,7 +637,7 @@ struct capture : public operand
operand *what;
virtual void gen_transform (FILE *f, int, const char *, bool, int,
const char *, capture_info *,
dt_operand ** = 0, bool = true);
dt_operand ** = 0, int = 0);
};
/* if expression. */
@ -2149,7 +2149,7 @@ get_operand_type (id_base *op, const char *in_type,
void
expr::gen_transform (FILE *f, int indent, const char *dest, bool gimple,
int depth, const char *in_type, capture_info *cinfo,
dt_operand **indexes, bool)
dt_operand **indexes, int)
{
id_base *opr = operation;
/* When we delay operator substituting during lowering of fors we
@ -2213,9 +2213,8 @@ expr::gen_transform (FILE *f, int indent, const char *dest, bool gimple,
i == 0 ? NULL : op0type);
ops[i]->gen_transform (f, indent, dest, gimple, depth + 1, optype,
cinfo, indexes,
((!(*opr == COND_EXPR)
&& !(*opr == VEC_COND_EXPR))
|| i != 0));
(*opr == COND_EXPR
|| *opr == VEC_COND_EXPR) && i == 0 ? 1 : 2);
}
const char *opr_name;
@ -2306,7 +2305,7 @@ expr::gen_transform (FILE *f, int indent, const char *dest, bool gimple,
void
c_expr::gen_transform (FILE *f, int indent, const char *dest,
bool, int, const char *, capture_info *,
dt_operand **, bool)
dt_operand **, int)
{
if (dest && nr_stmts == 1)
fprintf_indent (f, indent, "%s = ", dest);
@ -2378,7 +2377,7 @@ c_expr::gen_transform (FILE *f, int indent, const char *dest,
void
capture::gen_transform (FILE *f, int indent, const char *dest, bool gimple,
int depth, const char *in_type, capture_info *cinfo,
dt_operand **indexes, bool expand_compares)
dt_operand **indexes, int cond_handling)
{
if (what && is_a<expr *> (what))
{
@ -2394,20 +2393,29 @@ capture::gen_transform (FILE *f, int indent, const char *dest, bool gimple,
fprintf_indent (f, indent, "%s = captures[%u];\n", dest, where);
/* ??? Stupid tcc_comparison GENERIC trees in COND_EXPRs. Deal
with substituting a capture of that.
??? Returning false here will also not allow any other patterns
to match. */
if (gimple && expand_compares
with substituting a capture of that. */
if (gimple
&& cond_handling != 0
&& cinfo->info[where].cond_expr_cond_p)
{
fprintf_indent (f, indent, "if (COMPARISON_CLASS_P (%s))\n", dest);
fprintf_indent (f, indent, " {\n");
fprintf_indent (f, indent, " if (!seq) return false;\n");
fprintf_indent (f, indent, " %s = gimple_build (seq, TREE_CODE (%s),"
" TREE_TYPE (%s), TREE_OPERAND (%s, 0),"
" TREE_OPERAND (%s, 1));\n",
dest, dest, dest, dest, dest);
fprintf_indent (f, indent, " }\n");
/* If substituting into a cond_expr condition, unshare. */
if (cond_handling == 1)
fprintf_indent (f, indent, "%s = unshare_expr (%s);\n", dest, dest);
/* If substituting elsewhere we might need to decompose it. */
else if (cond_handling == 2)
{
/* ??? Returning false here will also not allow any other patterns
to match unless this generator was split out. */
fprintf_indent (f, indent, "if (COMPARISON_CLASS_P (%s))\n", dest);
fprintf_indent (f, indent, " {\n");
fprintf_indent (f, indent, " if (!seq) return false;\n");
fprintf_indent (f, indent, " %s = gimple_build (seq,"
" TREE_CODE (%s),"
" TREE_TYPE (%s), TREE_OPERAND (%s, 0),"
" TREE_OPERAND (%s, 1));\n",
dest, dest, dest, dest, dest);
fprintf_indent (f, indent, " }\n");
}
}
}
@ -3043,18 +3051,14 @@ dt_simplify::gen_1 (FILE *f, int indent, bool gimple, operand *result)
"type", e->expr_type,
j == 0 ? NULL : "TREE_TYPE (res_ops[0])");
/* We need to expand GENERIC conditions we captured from
COND_EXPRs. */
bool expand_generic_cond_exprs_p
= (!is_predicate
/* But avoid doing that if the GENERIC condition is
valid - which it is in the first operand of COND_EXPRs
and VEC_COND_EXRPs. */
&& ((!(*opr == COND_EXPR)
&& !(*opr == VEC_COND_EXPR))
|| j != 0));
COND_EXPRs and we need to unshare them when substituting
into COND_EXPRs. */
int cond_handling = 0;
if (!is_predicate)
cond_handling = ((*opr == COND_EXPR
|| *opr == VEC_COND_EXPR) && j == 0) ? 1 : 2;
e->ops[j]->gen_transform (f, indent, dest, true, 1, optype,
&cinfo,
indexes, expand_generic_cond_exprs_p);
&cinfo, indexes, cond_handling);
}
/* Re-fold the toplevel result. It's basically an embedded
@ -3068,7 +3072,7 @@ dt_simplify::gen_1 (FILE *f, int indent, bool gimple, operand *result)
|| result->type == operand::OP_C_EXPR)
{
result->gen_transform (f, indent, "res_ops[0]", true, 1, "type",
&cinfo, indexes, false);
&cinfo, indexes);
fprintf_indent (f, indent, "*res_code = TREE_CODE (res_ops[0]);\n");
if (is_a <capture *> (result)
&& cinfo.info[as_a <capture *> (result)->where].cond_expr_cond_p)

1
gcc/gimple-match-head.c
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@ -38,6 +38,7 @@ along with GCC; see the file COPYING3. If not see
#include "tree-pass.h"
#include "internal-fn.h"
#include "case-cfn-macros.h"
#include "gimplify.h"
/* Forward declarations of the private auto-generated matchers.

16
gcc/match.pd
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@ -1752,28 +1752,26 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
(cnd (logical_inverted_value truth_valued_p@0) @1 @2)
(cnd @0 @2 @1)))
/* A + (B vcmp C ? 1 : 0) -> A - (B vcmp C), since vector comparisons
return all-1 or all-0 results. */
/* A + (B vcmp C ? 1 : 0) -> A - (B vcmp C ? -1 : 0), since vector comparisons
return all -1 or all 0 results. */
/* ??? We could instead convert all instances of the vec_cond to negate,
but that isn't necessarily a win on its own. */
(simplify
(plus:c @3 (view_convert? (vec_cond @0 integer_each_onep@1 integer_zerop@2)))
(plus:c @3 (view_convert? (vec_cond:s @0 integer_each_onep@1 integer_zerop@2)))
(if (VECTOR_TYPE_P (type)
&& VECTOR_MODE_P (TYPE_MODE (TREE_TYPE (@0)))
&& TYPE_VECTOR_SUBPARTS (type) == TYPE_VECTOR_SUBPARTS (TREE_TYPE (@0))
&& (TYPE_MODE (TREE_TYPE (type))
== TYPE_MODE (TREE_TYPE (TREE_TYPE (@0)))))
(minus @3 (view_convert @0))))
(minus @3 (view_convert (vec_cond @0 (negate @1) @2)))))
/* ... likewise A - (B vcmp C ? 1 : 0) -> A + (B vcmp C). */
/* ... likewise A - (B vcmp C ? 1 : 0) -> A + (B vcmp C ? -1 : 0). */
(simplify
(minus @3 (view_convert? (vec_cond @0 integer_each_onep@1 integer_zerop@2)))
(minus @3 (view_convert? (vec_cond:s @0 integer_each_onep@1 integer_zerop@2)))
(if (VECTOR_TYPE_P (type)
&& VECTOR_MODE_P (TYPE_MODE (TREE_TYPE (@0)))
&& TYPE_VECTOR_SUBPARTS (type) == TYPE_VECTOR_SUBPARTS (TREE_TYPE (@0))
&& (TYPE_MODE (TREE_TYPE (type))
== TYPE_MODE (TREE_TYPE (TREE_TYPE (@0)))))
(plus @3 (view_convert @0))))
(plus @3 (view_convert (vec_cond @0 (negate @1) @2)))))
/* Simplifications of comparisons. */

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2016-03-22 Richard Biener <rguenther@suse.de>
PR middle-end/70251
* g++.dg/torture/pr70251.C: New testcase.
2016-03-22 David Malcolm <dmalcolm@redhat.com>
PR c/69993

11
gcc/testsuite/g++.dg/torture/pr70251.C Normal file
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@ -0,0 +1,11 @@
// { dg-do compile }
// { dg-additional-options "-w -Wno-psabi" }
typedef int vec __attribute__((vector_size(64)));
vec f(vec x,vec y,vec z)
{
vec zero={};
vec one=zero+1;
vec c=x<y;
return z+(c?one:zero);
}