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re PR debug/49496 (-fcompare-debug failure (length) with -O -ftree-vectorize)

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PR debug/49496
	* tree-vect-patterns.c (vect_recog_widen_mult_pattern): Ignore debug
	uses.

	* gcc.dg/pr49496.c: New test.

From-SVN: r175314
This commit is contained in:
Jakub Jelinek 2011-06-22 22:37:54 +02:00 • committed by Jakub Jelinek
parent 7d059f1894
commit 4fb489e796
4 changed files with 35 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2011-06-22 Jakub Jelinek <jakub@redhat.com>
PR debug/49496
* tree-vect-patterns.c (vect_recog_widen_mult_pattern): Ignore debug
uses.
2011-06-22 Richard Guenther <rguenther@suse.de>
PR tree-optimization/49493

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2011-06-22 Jakub Jelinek <jakub@redhat.com>
PR debug/49496
* gcc.dg/pr49496.c: New test.
2011-06-22 Janis Johnson <janisjo@codesourcery.com>
* gcc.target/arm/scd42-3.c: Allow -march-xscale; skip if -mcpu

20
gcc/testsuite/gcc.dg/pr49496.c Normal file
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@ -0,0 +1,20 @@
/* PR debug/49496 */
/* { dg-do compile } */
/* { dg-options "-O3 -fcompare-debug" } */
unsigned short u[8], s1[8], s2[8];
void bar (unsigned short *);
void
foo (void)
{
unsigned short e[8];
int i;
for (i = 0; i < 8; i++)
{
int tmp = s1[i] * s2[i];
e[i] = (tmp & 0xffff0000) >> 16;
}
bar (e);
}

5
gcc/tree-vect-patterns.c
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@ -1,5 +1,6 @@
/* Analysis Utilities for Loop Vectorization.
Copyright (C) 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
Contributed by Dorit Nuzman <dorit@il.ibm.com>
This file is part of GCC.
@ -557,6 +558,8 @@ vect_recog_widen_mult_pattern (VEC (gimple, heap) **stmts,
FOR_EACH_IMM_USE_FAST (use_p, imm_iter, lhs)
{
if (is_gimple_debug (USE_STMT (use_p)))
continue;
use_stmt = USE_STMT (use_p);
nuses++;
}