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Re: [PATCH] Make mergeable read-only sections per-function, if requested.

From: Jeff Law <law at redhat dot com>
To: Marek Polacek <polacek at redhat dot com>, Segher Boessenkool <segher at kernel dot crashing dot org>
Cc: gcc-patches at gcc dot gnu dot org
Date: Thu, 07 May 2015 07:29:29 -0600
Subject: Re: [PATCH] Make mergeable read-only sections per-function, if requested.
Authentication-results: sourceware.org; auth=none
References: <8f67f9aad3d5b98cb428dea0316a86615b89adb9 dot 1430937961 dot git dot segher at kernel dot crashing dot org> <20150507081507 dot GA3384 at redhat dot com>

On 05/07/2015 02:15 AM, Marek Polacek wrote:

On Wed, May 06, 2015 at 03:59:33PM -0700, Segher Boessenkool wrote:

Currently GCC does not put mergeable read-only data in a per-function
section, so the -gc-sections linker option does not do much for such
data.  Fix that.


Dunno if it is a good idea, but...

Why not? In a static build it gives the linker a chance to removeunreferenced data or to reorder the data to be more tlb or dcachefriendly. That's the whole purpose behind -f{function,data}-sections.


Jeff

References:
- [PATCH] Make mergeable read-only sections per-function, if requested.
  - From: Segher Boessenkool
- Re: [PATCH] Make mergeable read-only sections per-function, if requested.
  - From: Marek Polacek

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