gcc/testsuite/gcc.dg/tree-ssa/pr21658.c

   1 /* PR tree-optimization/21658
   2    CCP did not propagate an ADDR_EXPR far enough, preventing the "if"
   3    statement below from being folded.  */
   4
   5 /* { dg-do compile } */
   6 /* { dg-options "-O2 -fno-tree-dominator-opts -fdump-tree-ccp-details" } */
   7
   8 void link_error (void);
   9
  10 void
  11 f (void)
  12 {
  13   int a[10];
  14   int *p = &a[5];
  15   int *q = p - 1;
  16   if (q != &a[4])
  17     link_error ();
  18 }
  19
  20 /* { dg-final { scan-tree-dump-times "Folded into: if " 1 "ccp1"} } */
  21 /* { dg-final { cleanup-tree-dump "ccp\[1-2\]" } } */