gcc/testsuite/gcc.dg/dse.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-dse-details" } */
   3
   4 #define N 256
   5
   6 struct
   7 {
   8   int x;
   9   int y;
  10 } S[100];
  11
  12 int z[100];
  13
  14 int
  15 foo (void)
  16 {
  17   int i;
  18   int x, y;
  19
  20   S[5].x = 0;
  21   S[5].y = 0;
  22
  23   x = 5 + z[0];
  24   y = z[0];
  25
  26   S[5].x = x;
  27   S[5].y = y;
  28 }
  29
  30 /* { dg-final { scan-tree-dump-times "Deleted dead store" 2 "dse1" } } */
  31 /* { dg-final { cleanup-tree-dump "dse*" } } */
  32