gcc/testsuite/g++.dg/tree-ssa/pr18178.C

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-vrp1" } */
   3
   4 // Define this to see it work.
   5 // #define WORK_WORK_WORK
   6
   7 #define THIRD
   8
   9 #ifdef THIRD
  10 #define FIRST  i < 0 ||
  11 #define ORIG int
  12 #define CAST
  13 #else
  14
  15 #define FIRST
  16 #ifdef WORK_WORK_WORK
  17 #define ORIG unsigned int
  18 #define CAST
  19 #else
  20 #define ORIG int
  21 #define CAST (unsigned)
  22 #endif // WORK_WORK_WORK
  23
  24 #endif // THIRD
  25
  26 struct array
  27 {
  28   const ORIG len;
  29   int *data;
  30 };
  31
  32 extern void call (ORIG);
  33
  34 void doit (array *a)
  35 {
  36   for (ORIG i = 0; i < a->len; ++i)
  37     {
  38       if (FIRST  CAST (i) >= CAST (a->len))
  39         throw 5;
  40       call (a->data[i]);
  41     }
  42 }
  43
  44 /* VRP should remove all but 1 if() in the loop.  */
  45
  46 /* { dg-final { scan-tree-dump-times "if " 1 "vrp1"} } */
  47 /* { dg-final { cleanup-tree-dump "vrp1" } } */