gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-24.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -fno-tree-sra -fdump-tree-fre1" } */
   3
   4 int foo(void)
   5 {
   6   int a[16] = {};
   7   return a[3];
   8 }
   9
  10 int bar(void)
  11 {
  12   int a[16];
  13   __builtin_memset (a, 0, sizeof(a));
  14   return a[3];
  15 }
  16
  17 struct X { int i; };
  18 int baz(void)
  19 {
  20   struct X a,b;
  21   a.i = 0;
  22   b = a;
  23   return b.i;
  24 }
  25
  26 int bazzoo (void)
  27 {
  28   struct X b, a = {};
  29   b = a;
  30   return b.i;
  31 }
  32
  33 /* { dg-final { scan-tree-dump-times "return 0;" 4 "fre1" } } */
  34 /* { dg-final { cleanup-tree-dump "fre1" } } */