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Re: Enabling -frename-registers?

From: Jeff Law <law at redhat dot com>
To: Bernd Schmidt <bschmidt at redhat dot com>, David Edelsohn <dje dot gcc at gmail dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>
Cc: Segher Boessenkool <segher at kernel dot crashing dot org>
Date: Mon, 2 May 2016 07:31:57 -0600
Subject: Re: Enabling -frename-registers?
Authentication-results: sourceware.org; auth=none
References: <CAGWvnykBEjYMgOCaR_ZGLwB3fxPg-pB3WPSwAvmUBXzmXct8gg at mail dot gmail dot com> <57236285 dot 5090908 at redhat dot com>

On 04/29/2016 07:32 AM, Bernd Schmidt wrote:

On 04/29/2016 03:02 PM, David Edelsohn wrote:

How has this show general benefit for all architectures to deserve
enabling it by default at -O2?


It should improve postreload scheduling in general, and it can also help
clear up bad code generation left behind by register allocation.

Right. ISTM the round-robin renaming reduces the false dependenciesthat are inherently created by register allocation.


It should benefit any architecture that utilizes post-reload scheduling.

jeff

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