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re PR tree-optimization/87693 (ICE in thread_around_empty_blocks, at tree-ssa-threadedge.c:984)

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2018-10-23  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/87693
	* tree-ssa-threadedge.c (thread_around_empty_blocks): Handle
	the case we do not find the taken edge.

	* gcc.dg/torture/pr87693.c: New testcase.

From-SVN: r265413
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Richard Biener 2018-10-23 08:51:20 +00:00 committed by Richard Biener
parent 2efade53fe
commit a26eaf981d
4 changed files with 30 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2018-10-23 Richard Biener <rguenther@suse.de>
PR tree-optimization/87693
* tree-ssa-threadedge.c (thread_around_empty_blocks): Handle
the case we do not find the taken edge.
2018-10-22 Paul Koning <ni1d@arrl.net>
* symtab.c (symtab_node::increase_alignment): Correct max

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2018-10-23 Richard Biener <rguenther@suse.de>
PR tree-optimization/87693
* gcc.dg/torture/pr87693.c: New testcase.
2018-10-23 Paul Thomas <pault@gcc.gnu.org>
PR fortran/85603

17
gcc/testsuite/gcc.dg/torture/pr87693.c Normal file
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@ -0,0 +1,17 @@
/* { dg-do compile } */
void f (void);
void g (void);
void h (int a)
{
void *p, **q;
if (a)
p = (void *)f;
else
p = (void *)g;
q = (void *)p;
if (*q == (void *)0)
goto *p;
L0:
return;
}

3
gcc/tree-ssa-threadedge.c
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@ -981,7 +981,8 @@ thread_around_empty_blocks (edge taken_edge,
else
taken_edge = find_taken_edge (bb, cond);
if ((taken_edge->flags & EDGE_DFS_BACK) != 0)
if (!taken_edge
|| (taken_edge->flags & EDGE_DFS_BACK) != 0)
return false;
if (bitmap_bit_p (visited, taken_edge->dest->index))