[Bug target/29852] x86_64: SSE version missing for fmod{d,s,x}f3

[burnus at gcc dot gnu dot org]

------- Comment #2 from burnus at gcc dot gnu dot org  2006-11-29 10:38 -------
If one uses -mfpmath=387 or -mfpmath=sse,387, the speed also dramatically
increases.

Results with test case below on a Athlon64:

icc -O3 test.c; time ./a.out
d=100002.216410, r=100000.000026
real    0m2.549s; user    0m2.548s; sys     0m0.000s

gcc -ftree-vectorize -O3 -msse3 -ffast-math -lm test.c
d=100002.216410, r=100000.000026
real    0m5.444s; user    0m5.444s; sys     0m0.000s

gcc -ftree-vectorize -O3 -msse3 -mfpmath=sse,387 -ffast-math -lm test.c
d=100002.216410, r=100000.000026
real    0m1.363s; user    0m1.192s; sys     0m0.000s

----------------
#include <math.h>
#include <stdio.h>

int main() {
  double r,d;
  d = 0.0;
  for(r=0.0; r < 100000.0; r += 0.001)
    d = fmod(d,5.0)+r;
  printf("d=%f, r=%f\n",d,r);
  return 0;
}


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29852