gcc/testsuite/gcc.dg/torture/builtin-pow-mpfr-1.c

   1 /* Version 2.2.0 of MPFR had bugs in pow underflow/overflow.  This
   2    test checks to see if that buggy version was installed.  The
   3    problem is NOT fixed with the version 2.2.0 "cumulative patch".
   4    However it is fixed in version 2.2.1 and presumably later MPFR
   5    versions.
   6
   7    Origin: Kaveh R. Ghazi 12/17/2006.  */
   8
   9 /* { dg-do compile } */
  10 /* { dg-options "-fdump-tree-original" } */
  11
  12 extern double testit()
  13 {
  14   /* This underflows and therefore gcc should not fold it.  */
  15   return __builtin_pow (0.11, 1.0e38);
  16 }
  17
  18 /* { dg-final { scan-tree-dump "pow" "original" } } */
  19 /* { dg-final { cleanup-tree-dump "original" } } */