gcc/testsuite/gcc.dg/pr29921.c

   1 /* With -ffast-math, the latice value for t changes from -0.0 to 0.0 in this
   2    testcase.  */
   3
   4 /* { dg-do compile } */
   5 /* { dg-options "-O2 -ffast-math" } */
   6
   7 double test (int param)
   8 {
   9   double a = 0.0, b = -1.0, t;
  10   int i;
  11
  12   for (i = 0; i < 100; i++)
  13     {
  14       t = a * b;
  15       if (param)
  16         b = 2.0;
  17     }
  18
  19   return t;
  20 }