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Stop only if there aren't any usable algorithms 

When searching for an usable algorithm with -minline-all-stringops,
decide_alg stops when it sees libcall even if there is a usable
algorithm.  It goes into an infinite loop.  This patch changes
decide_alg to stop searching only if there aren't any usable algorithms.
Testd on Linux/x86-64.


gcc/

	PR target/64108
	* config/i386/i386.c (decide_alg): Stop only if there aren't
	any usable algorithms.

gcc/testsuite/

	PR target/64108
	* gcc.target/i386/memset-strategy-2.c: New test.

From-SVN: r218272
This commit is contained in:
H.J. Lu 2014-12-02 14:10:23 +00:00 committed by H.J. Lu
parent fb98f8869b
commit 0f884e6709
4 changed files with 23 additions and 1 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2014-12-02 H.J. Lu <hongjiu.lu@intel.com>
PR target/64108
* config/i386/i386.c (decide_alg): Stop only if there aren't
any usable algorithms.
2014-12-02 Tom de Vries <tom@codesourcery.com>
PR rtl-optimization/63718

3
gcc/config/i386/i386.c
View File

@ -24464,7 +24464,8 @@ decide_alg (HOST_WIDE_INT count, HOST_WIDE_INT expected_size,
*noalign = alg_noalign;
return alg;
}
break;
else if (!any_alg_usable_p)
break;
}
else if (alg_usable_p (candidate, memset))
{

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2014-12-02 H.J. Lu <hongjiu.lu@intel.com>
PR target/64108
* gcc.target/i386/memset-strategy-2.c: New test.
2014-12-02 Richard Biener <rguenther@suse.de>
* gcc.dg/torture/20141202-1.c: New testcase.

10
gcc/testsuite/gcc.target/i386/memset-strategy-2.c Normal file
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@ -0,0 +1,10 @@
/* PR target/64108 */
/* { dg-do compile } */
/* { dg-options "-O2 -march=atom -mmemset-strategy=libcall:-1:align -minline-all-stringops" } */
char a[2048];
void t (void)
{
__builtin_memset (a, 1, 2048);
}