gcc/testsuite/gcc.target/i386/opt-2.c

   1 /* Test the attribute((optimize)) really works.  Do this test by checking
   2    whether we vectorize a simple loop.  */
   3 /* { dg-do compile } */
   4 /* { dg-options "-O1 -msse2 -mfpmath=sse -march=k8 --param min-insn-to-prefetch-ratio=0" } */
   5 /* { dg-final { scan-assembler "prefetcht0" } } */
   6 /* { dg-final { scan-assembler "addps" } } */
   7 /* { dg-final { scan-assembler "subss" } } */
   8
   9 #define SIZE 10240
  10 float a[SIZE] __attribute__((__aligned__(32)));
  11 float b[SIZE] __attribute__((__aligned__(32)));
  12 float c[SIZE] __attribute__((__aligned__(32)));
  13
  14 /* This should vectorize.  */
  15 #pragma GCC push_options
  16 #pragma GCC optimize (3, "unroll-all-loops", "-fprefetch-loop-arrays")
  17
  18 void
  19 opt3 (void)
  20 {
  21   int i;
  22
  23   for (i = 0; i < SIZE; i++)
  24     a[i] = b[i] + c[i];
  25 }
  26
  27 #pragma GCC pop_options
  28
  29 /* This should not vectorize.  */
  30 void
  31 not_opt3 (void)
  32 {
  33   int i;
  34
  35   for (i = 0; i < SIZE; i++)
  36     a[i] = b[i] - c[i];
  37 }
  38