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re PR tree-optimization/92704 (ICE: Segmentation fault (in process_bb))

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2019-11-29  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/92704
	* tree-if-conv.c (combine_blocks): Deal with virtual PHIs
	in loops performing only loads.

	* gcc.dg/torture/pr92704.c: New testcase.

From-SVN: r278828
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Richard Biener 2019-11-29 08:05:03 +00:00 committed by Richard Biener
parent 34b43828f8
commit d5e82c9f68
4 changed files with 44 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2019-11-29 Richard Biener <rguenther@suse.de>
PR tree-optimization/92704
* tree-if-conv.c (combine_blocks): Deal with virtual PHIs
in loops performing only loads.
2019-11-29 Julian Brown <julian@codesourcery.com>
* builtin-types.def (BT_DFLOAT32_PTR, BT_DFLOAT64_PTR,

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2019-11-29 Richard Biener <rguenther@suse.de>
PR tree-optimization/92704
* gcc.dg/torture/pr92704.c: New testcase.
2019-11-29 Joseph Myers <joseph@codesourcery.com>
* objc.dg/attributes/gnu2x-attr-syntax-1.m: New test.

24
gcc/testsuite/gcc.dg/torture/pr92704.c Normal file
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@ -0,0 +1,24 @@
/* { dg-do compile } */
/* { dg-additional-options "-fexceptions -fnon-call-exceptions -fno-tree-dce -ftree-loop-if-convert" } */
int zr, yx;
void __attribute__ ((simd))
oj (int rd, int q7)
{
int wo = (__UINTPTR_TYPE__)&rd;
while (q7 < 1)
{
int kv;
short int v3;
for (v3 = 0; v3 < 82; v3 += 3)
{
}
kv = zr ? 0 : v3;
yx = kv < rd;
zr = zr && yx;
++q7;
}
}

9
gcc/tree-if-conv.c
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@ -2624,6 +2624,11 @@ combine_blocks (class loop *loop)
vphi = get_virtual_phi (bb);
if (vphi)
{
/* When there's just loads inside the loop a stray virtual
PHI merging the uses can appear, update last_vdef from
it. */
if (!last_vdef)
last_vdef = gimple_phi_arg_def (vphi, 0);
imm_use_iterator iter;
use_operand_p use_p;
gimple *use_stmt;
@ -2655,6 +2660,10 @@ combine_blocks (class loop *loop)
if (gimple_vdef (stmt))
last_vdef = gimple_vdef (stmt);
}
else
/* If this is the first load we arrive at update last_vdef
so we handle stray PHIs correctly. */
last_vdef = gimple_vuse (stmt);
if (predicated[i])
{
ssa_op_iter i;