[Bug tree-optimization/30375] [4.3 Regression] tree-ssa-dse incorrectly removes struct initialization

["rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #21 from rguenth at gcc dot gnu dot org  2007-08-31 10:59 -------
Runtime testcase that fails with --param max-aliased-vops=0:

typedef struct _s {
    int a;
    int b;
    int c;
    int d;
} s;

extern void abort(void);

void __attribute__((noinline)) g(s *p)
{
  if (p->d != 0)
    abort ();
}

char *c = (void*)0;
void __attribute__((noinline)) f(void) { if (c) *c = 1; }

void test_signed_msg_encoding(void)
{
    s signInfo = { sizeof(signInfo), 0 };

    signInfo.b = 1;
    signInfo.c = 0;
    g(&signInfo);
    signInfo.d = 1;
    f();
}

int main()
{
  test_signed_msg_encoding ();
  test_signed_msg_encoding ();
  return 0;
}


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30375