[Bug rtl-optimization/57130] [4.8/4.9 Regression] Incorrect "and --> extract" conversion in combine

[jakub at gcc dot gnu.org]

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;

}