gcc/testsuite/gcc.dg/tree-ssa/pr19590.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-ivopts" } */
   3
   4 void vnum_test8(int *data)
   5 {
   6   int i;
   7   int stop = data[3];
   8   int m = data[4];
   9   int n = m;
  10   for (i=1; i<stop; i++) {
  11     int k = data[2];
  12     data[k] = 2;
  13     data[0] = m - n;
  14     k = data[1];
  15     m = m + k;
  16     n = n + k;
  17   }
  18 }
  19
  20 /* Using the SCEV analysis, this loop should be transformed to:
  21
  22    | void vnum_result8(int *data)
  23    |{
  24    |  int i;
  25    |  int stop = data[3];
  26    |  for (i=1; i<stop; i++) {
  27    |    int k = data[2];
  28    |    data[k] = 2;
  29    |    data[0] = 0;
  30    |  }
  31    |}
  32
  33 */
  34
  35 /* { dg-final { scan-tree-dump-times "= 0;" 1 "ivopts"} } */
  36 /* { dg-final { scan-tree-dump-times "= 2;" 1 "ivopts"} } */
  37 /* { dg-final { cleanup-tree-dump "ivopts" } }  */