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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/101023] [11/12 Regression] wrong code with -mstackrealign
Date: Fri, 11 Jun 2021 12:56:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101023

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=3Dopteron -mstackrealign
--param=3Dhot-bb-frequency-fraction=3D1" }

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 =3D b;
  e->m2 ();
  return e->m1();
}

int
main ()
{
  register int r12 __asm ("r12") =3D 1;
  register int rax __asm ("rax") =3D 2;
  asm volatile ("" : "+r" (r12), "+r" (rax));
  foo ();
  asm volatile ("" : "+r" (r12));
  if (r12 !=3D 1)
    __builtin_abort ();
}=