whether we vectorize a simple loop. */
/* { dg-do compile } */
/* { dg-options "-O1 -msse2 -mfpmath=sse -march=k8" } */
+/* { dg-require-effective-target sse2 } */
/* { dg-final { scan-assembler "prefetcht0" } } */
/* { dg-final { scan-assembler "addps" } } */
/* { dg-final { scan-assembler "subss" } } */