gcc/testsuite/gcc.dg/pr19988.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -fdump-tree-optimized -fdump-tree-original" } */
   3
   4 double foo(double x, double y)
   5 {
   6   return ((x + 0.1234 * y) * (x - 0.1234 * y));
   7 }
   8
   9 /* Keep positive constants during folding.  */
  10 /* { dg-final { scan-tree-dump-times " 1.23" 2 "original" } } */
  11 /* CSE one multiplication.  */
  12 /* { dg-final { scan-tree-dump-times " \\\* " 2 "optimized" } } */