gcc/testsuite/gcc.target/i386/funcspec-7.c

   1 /* Test whether using target specific options, we can generate the reciprocal
   2    square root instruction.  */
   3 /* { dg-do compile } */
   4 /* { dg-options "-O2 -march=k8 -mno-recip -mfpmath=sse -ffast-math" } */
   5
   6 float do_recip  (float a) __attribute__((__target__("recip")));
   7 float do_normal (float a);
   8
   9 float do_recip  (float a) { return 1.0f / __builtin_sqrtf (a); }
  10 float do_normal (float a) { return 1.0f / __builtin_sqrtf (a); }
  11
  12 /* { dg-final { scan-assembler "sqrtss" } } */
  13 /* { dg-final { scan-assembler "rsqrtss" } } */