gcc/testsuite/gcc.dg/20030826-1.c

   1 /* Copyright (C) 2003 Free Software Foundation.
   2
   3    Check that constant folding of mathematical expressions doesn't
   4    break anything.
   5
   6    Written by Roger Sayle, 24th August 2003.  */
   7
   8 /* { dg-do run } */
   9 /* { dg-options "-O2 -ffast-math" } */
  10
  11 void abort(void);
  12
  13 double foo(double x)
  14 {
  15   return 12.0/(x*3.0);
  16 }
  17
  18 double bar(double x)
  19 {
  20   return (3.0/x)*4.0;
  21 }
  22
  23 int main()
  24 {
  25   if (foo(2.0) != 2.0)
  26     abort ();
  27
  28   if (bar(2.0) != 6.0)
  29     abort ();
  30
  31   return 0;
  32 }
  33