gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-14.c

   1 /* PR tree-optimization/29738.  We used not to realize that "i" can never
   2    become nonzero.  */
   3
   4 /* { dg-do compile } */
   5 /* { dg-options "-O2 -fdump-tree-optimized" } */
   6
   7 int i;
   8
   9 void foo (void);
  10 void bar (void)
  11 {
  12   int j;
  13   i = 0;
  14   for (j = 0; j < 10000; j++)
  15     if (i)
  16       foo ();
  17 }
  18
  19 /* Everything except for the "i = 0" assignment should get removed.  */
  20 /* { dg-final { scan-tree-dump-times "if" 0 "optimized"} } */
  21 /* { dg-final { cleanup-tree-dump "optimized" } } */