Add fgcse-sm test with scan-rtl-dump

2014-11-21  Tom de Vries  <tom@codesourcery.com>

	* gcc.dg/store-motion-fgcse-sm.c: New test.

From-SVN: r217916

gcc/testsuite/ChangeLog

+2014-11-21  Tom de Vries  <tom@codesourcery.com>
+
+	* gcc.dg/store-motion-fgcse-sm.c: New test.
+
 2014-11-21  Evgeny Stupachenko  <evstupac@gmail.com>
 
 	PR target/60451

gcc/testsuite/gcc.dg/store-motion-fgcse-sm.c

+/* { dg-do run } */
+/* { dg-options "-O2 -ftree-pre -fno-tree-loop-im -fgcse-sm -fdump-rtl-store_motion" } */
+
+/* tree-pre moves the *sum load out of the loop.  ftree-loop-im moves the *sum
+   store out of the loop, so we disable it, to allow fgcse-sm to do it
+   instead.  */
+
+#include <stdlib.h>
+
+void __attribute__((noinline))
+f (unsigned int *__restrict__ a, unsigned int *__restrict__ sum, unsigned int n)
+{
+  unsigned int i;
+  for (i = 0; i < n; ++i)
+    *sum += a[i];
+}
+
+int
+main ()
+{
+  unsigned int a[] = { 1, 10, 100 };
+  unsigned sum = 1000;
+
+  f (a, &sum, 3);
+  if (sum != 1111)
+    abort ();
+
+  return 0;
+}
+
+/* Check that -fgcse-sm did something for f.  */
+/* { dg-final { scan-rtl-dump "STORE_MOTION of f, .* basic blocks, 1 insns deleted, 1 insns created" "store_motion" } } */