[Bug target/101023] [11/12 Regression] wrong code with -mstackrealign

["jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101023

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Here it is:

// PR target/101023
// { dg-do run }
// { dg-options "-O2 -mtune=opteron -mstackrealign
--param=hot-bb-frequency-fraction=1" }

struct S {
  __attribute__((noipa)) int m1 ();
  __attribute__((noipa)) void m2 ();
};
struct T {
  __attribute__((noipa)) virtual S m3 ();
};
struct U : T {
  int u;
  __attribute__((noipa)) U (int);
};
int *a;
S *b;
int c;

int
S::m1 ()
{
  return 0;
}

void
S::m2 ()
{
}

S
T::m3 ()
{
  return S ();
}

U::U (int) : u (4)
{
}

__attribute__((noipa)) int
foo ()
{
  if (a)
    return 0;
  U d(c);
  S *e = b;
  e->m2 ();
  return e->m1();
}

int
main ()
{
  register int r12 __asm ("r12") = 1;
  register int rax __asm ("rax") = 2;
  asm volatile ("" : "+r" (r12), "+r" (rax));
  foo ();
  asm volatile ("" : "+r" (r12));
  if (r12 != 1)
    __builtin_abort ();
}