gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-95.c

   1 /* PR100112 and dups.  */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2 -fdump-tree-fre1-details -fdump-tree-optimized" } */
   4
   5 int *c, *b;
   6 void foo()
   7 {
   8   int *tem = b;
   9   *tem = 0;
  10   int *footem = c;
  11   c = footem;
  12 }
  13
  14 void bar()
  15 {
  16   int *tem = b;
  17   int *bartem = c;
  18   *tem = 0;
  19   c = bartem;
  20 }
  21
  22 /* We should elide the redundant store in foo, in bar it is not redundant since
  23    the *tem = 0 store might alias.  */
  24 /* { dg-final { scan-tree-dump "Deleted redundant store c = footem" "fre1" } } */
  25 /* { dg-final { scan-tree-dump "c = bartem" "optimized" } } */