gcc/testsuite/gcc.target/i386/opt-1.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 void opt3 (void) __attribute__((__optimize__(3,"unroll-all-loops,-fprefetch-loop-arrays")));
  16
  17 void
  18 opt3 (void)
  19 {
  20   int i;
  21
  22   for (i = 0; i < SIZE; i++)
  23     a[i] = b[i] + c[i];
  24 }
  25
  26 /* This should not vectorize.  */
  27 void
  28 not_opt3 (void)
  29 {
  30   int i;
  31
  32   for (i = 0; i < SIZE; i++)
  33     a[i] = b[i] - c[i];
  34 }
  35