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Subject: [Bug target/55940] [4.7/4.8 Regression] Incorrect code for accessing parameters with 32-bit Intel hosts
Date: Tue, 15 Jan 2013 17:46:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55940

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW
   Target Milestone|---                         |4.7.3
            Summary|Incorrect code for          |[4.7/4.8 Regression]
                   |accessing parameters with   |Incorrect code for
                   |32-bit Intel hosts          |accessing parameters with
                   |                            |32-bit Intel hosts

--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-01-15 17:45:48 UTC ---
Sounds like shrink-wrapping bug to me:

/* { dg-options "-Os" } */
/* { dg-additional-options "-mpreferred-stack-boundary=2" { target { { i?86-*-*
x86_64-*-* } && ia32 } } } */

struct S { int s; unsigned long t; };

__attribute__ ((visibility ("hidden"))) unsigned long long bar (struct S *x,
unsigned long y);

unsigned long long
foo (struct S *x, unsigned long y)
{
  unsigned long a;
  if (__builtin_expect (((unsigned long) (x) + 0x1000U < 0x2000U), 0))
    return ~0ULL;
  if (__builtin_expect (x->s <= 0 || x->s > 9, 0))
    return ~0ULL;
  a = x->t >> 12;
  if (y >= a && y == a)
    return ~0ULL;
  if (x->s == 3)
    return x->t + y * 4096;
  return bar (x, y);
}

The pre-prologue code can't use registers initialized in the prologue.