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re PR tree-optimization/68906 (ICE at -O3 on x86_64-linux-gnu: verify_ssa failed) 

gcc/

2015-12-18  Yuri Rumyantsev  <ysrumyan@gmail.com>

	PR tree-optimization/68906
	* tree-ssa-loop-unswitch.c (tree_unswitch_outer_loop): Add check
	that an exit block belongs to LOOP.

gcc/testsuite/

2015-12-18  Yuri Rumyantsev  <ysrumyan@gmail.com>

	PR tree-optimization/68906
	* gcc.dg/torture/pr68906.c: New test.

From-SVN: r231812
This commit is contained in:
Yuri Rumyantsev 2015-12-18 10:16:56 +00:00 committed by Ilya Enkovich
parent b3d51f238b
commit 5c846df71f
4 changed files with 37 additions and 2 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2015-12-18 Yuri Rumyantsev <ysrumyan@gmail.com>
PR tree-optimization/68906
* tree-ssa-loop-unswitch.c (tree_unswitch_outer_loop): Add check
that an exit block belongs to LOOP.
2015-12-18 Ilya Enkovich <enkovich.gnu@gmail.com>
PR tree-optimization/68956

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2015-12-18 Yuri Rumyantsev <ysrumyan@gmail.com>
PR tree-optimization/68906
* gcc.dg/torture/pr68906.c: New test.
2015-12-18 Ilya Enkovich <enkovich.gnu@gmail.com>
PR tree-optimization/68956

24
gcc/testsuite/gcc.dg/torture/pr68906.c Normal file
View File

@ -0,0 +1,24 @@
/* { dg-do compile } */
/* { dg-options "-O3" } */
int a;
volatile int b;
short c, d;
int
fn1 ()
{
int e;
for (;;)
{
a = 3;
if (c)
continue;
e = 0;
for (; e > -30; e--)
if (b)
{
int f = e;
return d;
}
}
}

4
gcc/tree-ssa-loop-unswitch.c
View File

@ -429,9 +429,9 @@ tree_unswitch_outer_loop (struct loop *loop)
gcc_assert (loop->inner);
if (loop->inner->next)
return false;
/* Accept loops with single exit only. */
/* Accept loops with single exit only which is not from inner loop. */
exit = single_exit (loop);
if (!exit)
if (!exit || exit->src->loop_father != loop)
return false;
/* Check that phi argument of exit edge is not defined inside loop. */
if (!check_exit_phi (loop))