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re PR tree-optimization/71261 (Trunk GCC hangs on knl and broadwell targets) 

2016-05-25  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/71261
	* tree-if-conv.c (ifcvt_split_def_stmt): Walk uses on the
	interesting stmt instead of immediate uses when looking
	for the use operand to replace.

	* c-c++-common/torture/pr71261.c: New testcase.

From-SVN: r236701
This commit is contained in:
Richard Biener 2016-05-25 11:49:03 +00:00 committed by Richard Biener
parent a86f2f6f94
commit 3072d4ea29
4 changed files with 26 additions and 3 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2016-05-25 Richard Biener <rguenther@suse.de>
PR tree-optimization/71261
* tree-if-conv.c (ifcvt_split_def_stmt): Walk uses on the
interesting stmt instead of immediate uses when looking
for the use operand to replace.
2016-05-25 Martin Liska <mliska@suse.cz>
* ipa-inline.c (edge_badness): Use 'w/' instead of 'w'.

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2016-05-25 Richard Biener <rguenther@suse.de>
PR tree-optimization/71261
* c-c++-common/torture/pr71261.c: New testcase.
2016-05-25 Richard Biener <rguenther@suse.de>
PR tree-optimization/71264

11
gcc/testsuite/c-c++-common/torture/pr71261.c Normal file
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@ -0,0 +1,11 @@
/* { dg-do compile } */
/* { dg-additional-options "-mavx2" { target x86_64-*-* i?86-*-* } } */
extern int a, b, c, d, e, f;
void fn1()
{
for (int g = 0; g < d; g = 1)
for (int h = 0; h < 8; h = h + 2)
for (int i = h; i < h + 2; i = i + 1)
f = a && e || c && b;
}

6
gcc/tree-if-conv.c
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@ -2529,7 +2529,7 @@ ifcvt_split_def_stmt (gimple *def_stmt, gimple *use_stmt)
gimple *copy_stmt;
gimple_stmt_iterator gsi;
use_operand_p use_p;
imm_use_iterator imm_iter;
ssa_op_iter iter;
var = gimple_assign_lhs (def_stmt);
copy_stmt = gimple_copy (def_stmt);
@ -2548,9 +2548,9 @@ ifcvt_split_def_stmt (gimple *def_stmt, gimple *use_stmt)
print_generic_expr (dump_file, lhs, TDF_SLIM);
fprintf (dump_file, "\n");
}
FOR_EACH_IMM_USE_FAST (use_p, imm_iter, var)
FOR_EACH_SSA_USE_OPERAND (use_p, use_stmt, iter, SSA_OP_USE)
{
if (USE_STMT (use_p) != use_stmt)
if (USE_FROM_PTR (use_p) != var)
continue;
SET_USE (use_p, lhs);
break;