gcc/testsuite/gcc.target/i386/hot-1.c

   1 /* Test whether using attribute((hot)) really turns on -O3.  Do this test
   2    by checking whether we vectorize a simple loop.  */
   3 /* { dg-do compile } */
   4 /* { dg-options "-O1 -msse2 -mfpmath=sse -march=k8" } */
   5 /* { dg-final { scan-assembler "addps" } } */
   6 /* { dg-final { scan-assembler "subss" } } */
   7
   8 #define SIZE 1024
   9 float a[SIZE] __attribute__((__aligned__(32)));
  10 float b[SIZE] __attribute__((__aligned__(32)));
  11 float c[SIZE] __attribute__((__aligned__(32)));
  12
  13 /* This should vectorize.  */
  14 void hot (void) __attribute__((__hot__));
  15
  16 void
  17 hot (void)
  18 {
  19   int i;
  20
  21   for (i = 0; i < SIZE; i++)
  22     a[i] = b[i] + c[i];
  23 }
  24
  25 /* This should not vectorize.  */
  26 void
  27 not_hot (void)
  28 {
  29   int i;
  30
  31   for (i = 0; i < SIZE; i++)
  32     a[i] = b[i] - c[i];
  33 }