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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/57130] [4.8/4.9 Regression] Incorrect "and --> extract" conversion in combine
Date: Thu, 02 May 2013 06:58:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57130

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-05-02 06:58:38 UTC ---
Slightly more reduced testcase:
struct S { int a, b, c, d; } s[2] = { { 6, 8, -8, -5 }, { 0, 2, -1, 2 } };

__attribute__((noinline, noclone)) void
foo (struct S r)
{
  static int cnt;
  if (__builtin_memcmp (&r, &s[cnt++], sizeof r) != 0)
    __builtin_abort ();
}

int
main ()
{
  struct S r = { 6, 8, -8, -5 };
  foo (r);
  r = (struct S) { 0, 2, -1, 2 };
  foo (r);
  return 0;
}