gcc/testsuite/gcc.dg/fastmath-1.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -ffast-math" } */
   3
   4 int foo ( float* dists,  int k)
   5 {
   6 if ( ( dists [ 0 ] > 0 ) == ( dists [ 1 ] > 0 ) )
   7   return k;
   8 return 0;
   9 }
  10 main() {
  11   float dists[16] = { 0., 1., 1., 0., 0., -1., -1., 0.,
  12                      1., 1., 1., -1., -1., 1., -1., -1. };
  13   if ( foo(&dists[0], 1) +
  14        foo(&dists[2], 2) +
  15        foo(&dists[4], 4) +
  16        foo(&dists[6], 8) +
  17        foo(&dists[8], 16) +
  18        foo(&dists[10], 32) +
  19        foo(&dists[12], 64) +
  20        foo(&dists[14], 128)
  21         != 156)
  22     abort();
  23   return 0;
  24 }