gcc/testsuite/gcc.dg/recip_sqrt_mult_1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-Ofast -fdump-tree-recip" } */
   3 /* { dg-additional-options "-fcompare-debug" { target { ! powerpc-ibm-aix* } } } */
   4
   5 double res, res2, tmp;
   6 void
   7 foo (double a, double b)
   8 {
   9   tmp = 1.0 / __builtin_sqrt (a);
  10   res = tmp * tmp;
  11   res2 = a * tmp;
  12 }
  13
  14 /* { dg-final { scan-tree-dump "Optimizing reciprocal sqrt multiplications" "recip" } } */
  15 /* { dg-final { scan-tree-dump "Replacing squaring multiplication" "recip" } } */
  16 /* { dg-final { scan-tree-dump "Replacing original division" "recip" } } */