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Re: Enabling -frename-registers?
- From: Ramana Radhakrishnan <ramana dot gcc at googlemail dot com>
- To: Bernd Schmidt <bschmidt at redhat dot com>
- Cc: Ramana Radhakrishnan <ramana dot radhakrishnan at arm dot com>, Eric Botcazou <ebotcazou at adacore dot com>, gcc-patches <gcc-patches at gcc dot gnu dot org>, David Edelsohn <dje dot gcc at gmail dot com>, Richard Biener <richard dot guenther at gmail dot com>, Jeffrey Law <law at redhat dot com>, Segher Boessenkool <segher at kernel dot crashing dot org>, nd <nd at arm dot com>
- Date: Wed, 4 May 2016 14:39:05 +0100
- Subject: Re: Enabling -frename-registers?
- Authentication-results: sourceware.org; auth=none
- References: <CAGWvnykBEjYMgOCaR_ZGLwB3fxPg-pB3WPSwAvmUBXzmXct8gg at mail dot gmail dot com> <2317874 dot CXT2IFrHHt at polaris> <5729CAB8 dot 8040805 at redhat dot com> <1996332 dot 01ClvNjCVc at polaris> <5729F83A dot 1060008 at arm dot com> <5729FB28 dot 2060900 at redhat dot com>
On Wed, May 4, 2016 at 2:37 PM, Bernd Schmidt <bschmidt@redhat.com> wrote:
> On 05/04/2016 03:25 PM, Ramana Radhakrishnan wrote:
>>
>> On ARM / AArch32 I haven't seen any performance data yet - the one
>> place we are concerned about the impact is on Thumb2 code size as
>> regrename may end up inadvertently putting more things in high
>> registers.
>
>
> In theory at least arm_preferred_rename_class is designed to make the
> opposite happen.
Indeed, yes - I'd forgotten that hook - but yes we should see if
something sticks out.
regards
Ramana
>
>
> Bernd