1 files changed, 23 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/prefetch-3.c b/gcc/testsuite/gcc.dg/tree-ssa/prefetch-3.c
new file mode 100644
index 000000000..2c1282d9d
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/prefetch-3.c
@@ -0,0 +1,23 @@
+/* Prefetching used to prefer nonsensical unroll factor of 5 in this testcase.  */
+
+/* { dg-do compile { target i?86-*-* x86_64-*-* } } */
+/* { dg-require-effective-target ilp32 } */
+/* { dg-options "-O2 -fprefetch-loop-arrays -march=athlon -msse2 -mfpmath=sse -fdump-tree-aprefetch-details" } */
+
+#define N 1000000
+
+double a[N];
+
+double test(void)
+{
+  unsigned i;
+  double sum = 0;
+
+  for (i = 0; i < N; i += 2)
+    sum += (a[i] * a[i+1]);
+
+  return sum;
+}
+
+/* { dg-final { scan-tree-dump-times "unroll factor 4" 1 "aprefetch" } } */
+/* { dg-final { cleanup-tree-dump "aprefetch" } } */