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re PR tree-optimization/81500 (ICE with -O3 in process_use, at tree-vect-stmts.c:506)

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2017-06-21  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/81500
	* tree-vect-loop.c (vect_is_simple_reduction): Properly fail if
	we didn't identify a reduction path.

	* gcc.dg/torture/pr81500.c: New testcase.

From-SVN: r250423
This commit is contained in:
Richard Biener 2017-07-21 11:32:01 +00:00 committed by Richard Biener
parent 8c38aed722
commit 9af7f3731b
4 changed files with 26 additions and 4 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-06-21 Richard Biener <rguenther@suse.de>
PR tree-optimization/81500
* tree-vect-loop.c (vect_is_simple_reduction): Properly fail if
we didn't identify a reduction path.
2017-07-21 Tom de Vries <tom@codesourcery.com>
Cesar Philippidis <cesar@codesourcery.com>

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2017-06-21 Richard Biener <rguenther@suse.de>
PR tree-optimization/81500
* gcc.dg/torture/pr81500.c: New testcase.
2017-07-20 Nathan Sidwell <nathan@acm.org>
* g++.dg/ext/anon-struct6.C: Adjust diag.

13
gcc/testsuite/gcc.dg/torture/pr81500.c Normal file
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@ -0,0 +1,13 @@
/* { dg-do compile } */
typedef int a;
void c(int *b)
{
int d;
a e, f, *g, *h = b;
for (; d; d--) {
f = *g & 1;
*h-- = *g-- | e;
e = f;
}
}

6
gcc/tree-vect-loop.c
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@ -3243,7 +3243,7 @@ pop:
}
/* Check whether the reduction path detected is valid. */
bool fail = false;
bool fail = path.length () == 0;
bool neg = false;
for (unsigned i = 1; i < path.length (); ++i)
{
@ -3276,9 +3276,7 @@ pop:
if (dump_enabled_p ())
{
report_vect_op (MSG_MISSED_OPTIMIZATION,
SSA_NAME_DEF_STMT
(USE_FROM_PTR (path[path.length ()-1].second)),
report_vect_op (MSG_MISSED_OPTIMIZATION, def_stmt,
"reduction: unknown pattern: ");
}