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Re: BUG: GCC-4.4.x changes the function frame on some functions
- From: Richard Guenther <richard dot guenther at gmail dot com>
- To: "H. Peter Anvin" <hpa at zytor dot com>
- Cc: Andrew Haley <aph at redhat dot com>, Thomas Gleixner <tglx at linutronix dot de>, Ingo Molnar <mingo at elte dot hu>, LKML <linux-kernel at vger dot kernel dot org>, Andrew Morton <akpm at linux-foundation dot org>, Heiko Carstens <heiko dot carstens at de dot ibm dot com>, feng dot tang at intel dot com, "Fr??d??ric Weisbecker" <fweisbec at gmail dot com>, Steven Rostedt <rostedt at goodmis dot org>, Peter Zijlstra <peterz at infradead dot org>, jakub at redhat dot com, gcc at gcc dot gnu dot org, "H.J. Lu" <hjl dot tools at gmail dot com>
- Date: Thu, 19 Nov 2009 16:57:53 +0100
- Subject: Re: BUG: GCC-4.4.x changes the function frame on some functions
- References: <alpine.LFD.2.00.0911181933540.24119@localhost.localdomain> <tip-887a29f59b93cf54e21814869a4ab6e80b6fa623@git.kernel.org> <20091119072040.GA23579@elte.hu> <alpine.LFD.2.00.0911191053390.24119@localhost.localdomain> <alpine.LFD.2.00.0911191423190.24119@localhost.localdomain> <alpine.LFD.2.00.0911191607440.24119@localhost.localdomain> <4B0567E0.5080803@redhat.com> <4B056A1A.1020609@zytor.com>
On Thu, Nov 19, 2009 at 4:54 PM, H. Peter Anvin <hpa@zytor.com> wrote:
> On 11/19/2009 07:44 AM, Andrew Haley wrote:
>>
>> We're aligning the stack properly, as per the ABI requirements. ?Can't
>> you just fix the tracer?
>>
>
> "Per the ABI requirements?" ?We're talking 32 bits, here.
Hm, even with
void bar (int *);
void foo (void)
{
int x;
bar (&x);
}
gcc -S -O2 -m32 -mincoming-stack-boundary=2 t.c
we re-align the stack. That looks indeed bogus.
HJ, you invented all this code, what's the reason for the above?
Richard.