gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-15.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-dse1-details" } */
   3
   4 void *foo (int *p)
   5 {
   6   void *q;
   7   /* We should be able to DSE this store (p may point to errno).  */
   8   *p = 0;
   9   q = __builtin_malloc (4);
  10   *p = 0;
  11   return q;
  12 }
  13
  14 int j;
  15 void bar (int *i)
  16 {
  17   /* This store is dead as well.  */
  18   j = 1;
  19   *i = 0;
  20   j = 2;
  21 }
  22
  23 /* { dg-final { scan-tree-dump-times "Deleted dead store" 2 "dse1" } } */