gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-14.c


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/* { dg-do compile } */
/* { dg-options "-O -fdump-tree-dse1-details" } */

struct A { char c[4]; } a, b;

void
f1 (void)
{
  a.c[2] = '\0';
  __builtin_memset (&a.c[1], 1, 2);
}

void
f2 (void)
{
  __builtin_memcpy (&a.c[0], "a", 1);
  __builtin_memcpy (&a, &b, 3);
}

/* { dg-final { scan-tree-dump-times "Deleted dead store" 2 "dse1" } } */
/* { dg-final { cleanup-tree-dump "dse1" } } */