gcc/testsuite/gcc.dg/pr108385.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-evrp" } */
   3
   4 void bar(char *);
   5
   6 /* Ensure that PTR1 = PTR2 + OFF properly picks up the zero and non-zero
   7    properties if PTR1 and PTR2 are known equal or non-equal.  */
   8
   9 void foo1 (char *p, char *pp, int off)
  10 {
  11   char *q = p + off;
  12   if (q != p)
  13     {
  14       if (off == 0)
  15           bar (q);
  16     }
  17   else
  18     {
  19       if (off != 0)
  20         bar (p);
  21     }
  22 }
  23
  24 void foo2 (char *p, char *pp, int off)
  25 {
  26   char *q = p + off;
  27   if (q == p)
  28     {
  29       if (off != 0)
  30         bar (p);
  31     }
  32   else
  33     {
  34       if (off == 0)
  35           bar (q);
  36     }
  37 }
  38
  39 /* { dg-final { scan-tree-dump-not "bar" "evrp" } } */