gcc/testsuite/g++.dg/pr85746.C

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -fdump-tree-gimple" } */
   3
   4 int f(int a,int b){
   5   // The front-end should not fold this to 0.
   6   int c = __builtin_constant_p(a < b);
   7   return c;
   8 }
   9
  10 /* { dg-final { scan-tree-dump "__builtin_constant_p" "gimple" } } */