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From: Richard Guenther <richard.guenther@gmail.com>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: GCC Patches <gcc-patches@gcc.gnu.org>, Uros Bizjak <ubizjak@gmail.com>
Subject: Re: Turn on -fomit-frame-pointer by default for 32bit x86?
Date: Tue, 13 Jul 2010 20:40:00 -0000	[thread overview]
Message-ID: <AANLkTilE2qdGHgtHSVvYQ2j51FmwVKFkc8AynUez_cUt@mail.gmail.com> (raw)
In-Reply-To: <AANLkTikVToxej7rGdy3-vzbyyj1s1RJ7ItM85QEL-OPG@mail.gmail.com>

On Tue, Jul 13, 2010 at 8:15 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
> Hi,
>
> I checked the default code for 32bit. We currently generate
>
> [hjl@gnu-6 tmp]$ cat x.c
> void
> foo ()
> {
> }
> [hjl@gnu-6 tmp]$ /usr/gcc-4.5/bin/gcc -m32 -S x.c -O3
> [hjl@gnu-6 tmp]$ cat x.s
>        .file   "x.c"
>        .text
> .globl foo
>        .type   foo, @function
> foo:
>        pushl   %ebp
>        movl    %esp, %ebp
>        popl    %ebp
>        ret
>
> Can we turn on -fomit-frame-pointer by default for 32bit?

No, we don't have unwind information by default for 32bit.

Richard.

>
> --
> H.J.
>

  reply	other threads:[~2010-07-13 20:40 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-07-13 18:15 H.J. Lu
2010-07-13 20:40 ` Richard Guenther [this message]
2010-07-13 20:59   ` H.J. Lu
2010-07-13 21:02     ` Andrew Pinski
2010-07-13 21:03       ` Andrew Pinski
2010-07-13 21:44         ` H.J. Lu
2010-07-14  8:09           ` Richard Guenther
2010-07-14 13:47             ` H.J. Lu
2010-07-14 21:55               ` H.J. Lu
2010-07-14 12:00           ` Dave Korn
2010-07-16 19:35 ` Andi Kleen
2010-07-16 19:43   ` Jeff Law

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