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Re: Turn on -fomit-frame-pointer by default for 32bit Linux/x86
- From: Michael Witten <mfwitten at gmail dot com>
- To: Uros Bizjak <ubizjak at gmail dot com>
- Cc: GCC Development <gcc at gcc dot gnu dot org>, Richard Guenther <rguenther at suse dot de>, Jakub Jelinek <jakub at redhat dot com>, Mark Mitchell <mark at codesourcery dot com>, Richard Henderson <rth at redhat dot com>, jh at suse dot cz, "H.J. Lu" <hjl dot tools at gmail dot com>, Andi Kleen <andi at firstfloor dot org>, Andrew Haley <aph at redhat dot com>, David Daney <ddaney at caviumnetworks dot com>, Xinliang David Li <davidxl at google dot com>, Chris Lattner <clattner at apple dot com>
- Date: Sun, 8 Aug 2010 11:55:42 -0500
- Subject: Re: Turn on -fomit-frame-pointer by default for 32bit Linux/x86
- References: <AANLkTikArg8jNfW-DZQQRf9Q97+ay4q2e8nW8W8--XuD@mail.gmail.com> <AANLkTimgyd1Hi7V0r7oQ23MEJ4zstaoC1gvgi5_AApHO@mail.gmail.com> <AANLkTim+RsVU983qExmKM987ZeXqmuc7BN=fXqX5pFkM@mail.gmail.com>
On Sun, Aug 8, 2010 at 10:08, Uros Bizjak <ubizjak@gmail.com> wrote:
> On Sun, Aug 8, 2010 at 5:00 PM, Michael Witten <mfwitten@gmail.com> wrote:
>> On Sun, Aug 8, 2010 at 09:56, Uros Bizjak <ubizjak@gmail.com> wrote:
>>>
>>> IMO, we have to bite the bullet from time to time in order to improve
>>> the generated code.
>>
>> What's your performance function?
>
> See measurements at [1].
The point is that *my* performance function may be a measure of the
availability of decent backtraces.
> So, you will be able to use --enable-frame-pointer configure option.
Most of the computing world would probably benefit far more from
usable backtraces than from increases in efficiency; those individuals
who fret about efficiency are likely better suited to fiddling with
non-default flags.