1 /* { dg-do compile { target { powerpc*-*-* } } } */
2 /* { dg-skip-if "" { powerpc*-*-darwin* } { "*" } { "" } } */
3 /* { dg-require-effective-target powerpc_altivec_ok } */
4 /* { dg-require-effective-target powerpc_fprs } */
5 /* { dg-options "-O3 -ftree-vectorize -mcpu=power6 -ffast-math" } */
6 /* { dg-final { scan-assembler-times "fmadd" 1 } } */
7 /* { dg-final { scan-assembler-times "fmsub " 1 } } */
8 /* { dg-final { scan-assembler-not "fmul" } } */
9 /* { dg-final { scan-assembler-not "fadd " } } */
10
11 /* Check whether the common FFT idiom (a*b)+c and (a*b)-c generates two fma
12 instructions, instead of a multiply, add, and subtract. */
13
14 void
fft(double * result,double a,double b,double c)15 fft (double *result, double a, double b, double c)
16 {
17 result[0] = (a*b) + c;
18 result[1] = (a*b) - c;
19 }
20