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Subject: Re: Enabling -frename-registers?
To: Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>,        Eric Botcazou <ebotcazou@adacore.com>
References: <CAGWvnykBEjYMgOCaR_ZGLwB3fxPg-pB3WPSwAvmUBXzmXct8gg@mail.gmail.com> <2317874.CXT2IFrHHt@polaris> <5729CAB8.8040805@redhat.com> <1996332.01ClvNjCVc@polaris> <5729F83A.1060008@arm.com>
Cc: gcc-patches@gcc.gnu.org, David Edelsohn <dje.gcc@gmail.com>,        Richard Biener <richard.guenther@gmail.com>,        Jeffrey Law <law@redhat.com>,        Segher Boessenkool <segher@kernel.crashing.org>, nd <nd@arm.com>
From: Bernd Schmidt <bschmidt@redhat.com>
Message-ID: <5729FB28.2060900@redhat.com>
Date: Wed, 04 May 2016 13:37:00 -0000
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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.


Bernd