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

/* { dg-do compile { target { { powerpc*-*-* } && { ! powerpc*-apple-darwin* } } } } */
/* { dg-require-effective-target powerpc_fprs } */
/* { dg-options "-O2 -mrecip -ffast-math -mdejagnu-cpu=power5" } */
/* { dg-final { scan-assembler-times "frsqrtes" 1 } } */
/* { dg-final { scan-assembler-times "fmuls" 2 } } */
/* { dg-final { scan-assembler-times "fnmsubs" 3 } } */
/* { dg-final { scan-assembler-times "fmadds" 5 } } */
/* { dg-final { scan-assembler-times "fadds" 1 } } */
/* { dg-final { scan-assembler-times "fsqrt" 1 } } */

/* power5 resqrte is not accurate enough, and should not be generated by
   default for -mrecip.  */
double
rsqrt_d (double a)
{
  return 1.0 / __builtin_sqrt (a);
}

float
rsqrt_f (float a)
{
  return 1.0f / __builtin_sqrtf (a);
}