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Re: [PATCH] i386: Don't use frame pointer without stack access

From: Andi Kleen <andi at firstfloor dot org>
To: "H.J. Lu" <hjl dot tools at gmail dot com>
Cc: Arjan van de Ven <arjan at linux dot intel dot com>, Andi Kleen <andi at firstfloor dot org>, Michael Matz <matz at suse dot de>, Richard Biener <richard dot guenther at gmail dot com>, Richard Sandiford <richard dot sandiford at linaro dot org>, GCC Patches <gcc-patches at gcc dot gnu dot org>, Jakub Jelinek <jakub at redhat dot com>, Alexander Monakov <amonakov at ispras dot ru>, Uros Bizjak <ubizjak at gmail dot com>
Date: Wed, 9 Aug 2017 08:26:22 -0700
Subject: Re: [PATCH] i386: Don't use frame pointer without stack access
Authentication-results: sourceware.org; auth=none
References: <87wp6e7ykz.fsf@linaro.org> <87shh27yho.fsf@linaro.org> <87d18589em.fsf@linaro.org> <D780188F-2074-4B0B-AAAF-D882932ACC47@gmail.com> <CAMe9rOrh8zdFZtCRw3GfEkApY1hqJ70OSugvSRnqUWxrk+8hsA@mail.gmail.com> <alpine.LSU.2.21.1708091356230.15613@wotan.suse.de> <CAMe9rOqYfswAq_3h=vADptn1v6NcpyvALLCxBLOMDJKdZR97=w@mail.gmail.com> <874ltg4wb2.fsf@firstfloor.org> <a1e17209-90a5-8f94-6eff-9d058d171cc9@linux.intel.com> <CAMe9rOofwWjCrdXhdtePbfwCyENxi6igPMJdeDGwqRhrUXN9LQ@mail.gmail.com>

> This must be much more specific.  How does it impact:
> 
> 1. LTO
> 2. Function inlining.
> 3. Partial function inlining.
> 4. Shrink-wrapping.
> 
> Any of them can impact function stack frame.

It doesn't. It's just to get back to the previous state.

Also these others already have explicit options to disable them.


-Andi

Follow-Ups:
- Re: [PATCH] i386: Don't use frame pointer without stack access
  - From: H.J. Lu

References:
- Re: [PATCH] i386: Don't use frame pointer without stack access
  - From: Richard Sandiford
- Re: [PATCH] i386: Don't use frame pointer without stack access
  - From: Richard Sandiford
- Re: [PATCH] i386: Don't use frame pointer without stack access
  - From: Richard Sandiford
- Re: [PATCH] i386: Don't use frame pointer without stack access
  - From: Richard Biener
- Re: [PATCH] i386: Don't use frame pointer without stack access
  - From: H.J. Lu
- Re: [PATCH] i386: Don't use frame pointer without stack access
  - From: Michael Matz
- Re: [PATCH] i386: Don't use frame pointer without stack access
  - From: H.J. Lu
- Re: [PATCH] i386: Don't use frame pointer without stack access
  - From: Andi Kleen
- Re: [PATCH] i386: Don't use frame pointer without stack access
  - From: Arjan van de Ven
- Re: [PATCH] i386: Don't use frame pointer without stack access
  - From: H.J. Lu

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