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re PR tree-optimization/66101 (internal compiler error: in verify_loop_structure, at cfgloop.c:1662)

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2015-05-12  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/66101
	* tree-ssa-dce.c (remove_dead_stmt): Properly mark loops for
	fixup if we turn a loop exit edge to a fallthru edge.

	* gcc.dg/torture/pr66101.c: New testcase.

From-SVN: r223065
This commit is contained in:
Richard Biener 2015-05-12 13:28:33 +00:00 • committed by Richard Biener
parent caf07df9db
commit 7e37fe6f62
4 changed files with 52 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2015-05-12 Richard Biener <rguenther@suse.de>
PR tree-optimization/66101
* tree-ssa-dce.c (remove_dead_stmt): Properly mark loops for
fixup if we turn a loop exit edge to a fallthru edge.
2015-05-12 Richard Biener <rguenther@suse.de>
PR tree-optimization/37021

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2015-05-12 Richard Biener <rguenther@suse.de>
PR tree-optimization/66101
* gcc.dg/torture/pr66101.c: New testcase.
2015-05-12 Richard Biener <rguenther@suse.de>
PR tree-optimization/37021

35
gcc/testsuite/gcc.dg/torture/pr66101.c Normal file
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@ -0,0 +1,35 @@
/* { dg-do compile } */
#include <setjmp.h>
jmp_buf env;
int a, c, d, e;
int
bar ()
{
int b = *(long *) 7 == 5 ? : 0;
if (a || a > b)
longjmp (env, 0);
return 1;
}
void
foo ()
{
long f;
setjmp (env);
for (; d; c++)
switch (c)
case 0:
{
f = bar () >> 1;
if (e)
goto L;
if (bar () >> 1)
goto L;
}
L:
;
}

7
gcc/tree-ssa-dce.c
View file

@ -1149,7 +1149,12 @@ remove_dead_stmt (gimple_stmt_iterator *i, basic_block bb)
if (e != e2)
{
cfg_altered = true;
remove_edge (e2);
/* If we made a BB unconditionally exit a loop then this
transform alters the set of BBs in the loop. Schedule
a fixup. */
if (loop_exit_edge_p (bb->loop_father, e))
loops_state_set (LOOPS_NEED_FIXUP);
remove_edge (e2);
}
else
ei_next (&ei);