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

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -ffast-math" } */
   3
   4 extern void abort (void);
   5
   6 int foo ( float* dists,  int k)
   7 {
   8 if ( ( dists [ 0 ] > 0 ) == ( dists [ 1 ] > 0 ) )
   9   return k;
  10 return 0;
  11 }
  12 main() {
  13   float dists[16] = { 0., 1., 1., 0., 0., -1., -1., 0.,
  14                      1., 1., 1., -1., -1., 1., -1., -1. };
  15   if ( foo(&dists[0], 1) +
  16        foo(&dists[2], 2) +
  17        foo(&dists[4], 4) +
  18        foo(&dists[6], 8) +
  19        foo(&dists[8], 16) +
  20        foo(&dists[10], 32) +
  21        foo(&dists[12], 64) +
  22        foo(&dists[14], 128)
  23         != 156)
  24     abort();
  25   return 0;
  26 }