gcc/testsuite/gcc.target/powerpc/recip-2.c

   1 /* { dg-do compile { target { powerpc*-*-* } } } */
   2 /* { dg-options "-O2 -mrecip -ffast-math -mcpu=power5" } */
   3 /* { dg-final { scan-assembler-times "frsqrtes" 1 } } */
   4 /* { dg-final { scan-assembler-times "fmsubs" 1 } } */
   5 /* { dg-final { scan-assembler-times "fmuls" 6 } } */
   6 /* { dg-final { scan-assembler-times "fnmsubs" 3 } } */
   7 /* { dg-final { scan-assembler-times "fsqrt" 1 } } */
   8
   9 /* power5 resqrte is not accurate enough, and should not be generated by
  10    default for -mrecip.  */
  11 double
  12 rsqrt_d (double a)
  13 {
  14   return 1.0 / __builtin_sqrt (a);
  15 }
  16
  17 float
  18 rsqrt_f (float a)
  19 {
  20   return 1.0f / __builtin_sqrtf (a);
  21 }