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. OK for trunk.
H.J.
----
gcc/
2014-11-29 H.J. Lu <hongjiu...@intel.com>
PR target/64108
* config/i386/i386.c (decide_alg): Stop only if there aren't
any usable algorithms.
gcc/testsuite/
2014-11-29 H.J. Lu <hongjiu...@intel.com>
PR target/64108
* gcc.target/i386/memset-strategy-2.c: New test.
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 2493130..d789635 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -24464,7 +24464,9 @@ decide_alg (HOST_WIDE_INT count, HOST_WIDE_INT
expected_size,
*noalign = alg_noalign;
return alg;
}
- break;
+ /* Stop only if there aren't any usable algorithms. */
+ if (!any_alg_usable_p)
+ break;
}
else if (alg_usable_p (candidate, memset))
{
diff --git a/gcc/testsuite/gcc.target/i386/memset-strategy-2.c
b/gcc/testsuite/gcc.target/i386/memset-strategy-2.c
new file mode 100644
index 0000000..aafa54d
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/memset-strategy-2.c
@@ -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);
+}
+
