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Re: REG_NO_CONFLICT vs lower-subreg

From: "Andrew Pinski" <pinskia at gmail dot com>
To: bonzini at gnu dot org
Cc: "Bernd Schmidt" <bernds_cb1 at t-online dot de>, "GCC List" <gcc at gcc dot gnu dot org>, "Ian Lance Taylor" <ian at airs dot com>
Date: Mon, 16 Apr 2007 18:16:59 -0700
Subject: Re: REG_NO_CONFLICT vs lower-subreg
References: <462417C5.1060202@t-online.de> <462419BB.9040202@lu.unisi.ch>

On 4/16/07, Paolo Bonzini <paolo.bonzini@lu.unisi.ch> wrote:


> I suppose we could add a target macro to let individual ports turn off
> REG_NO_CONFLICT generation?  Any other ideas?

A pass to reorder insns so that live ranges are shortened and register
pressure is relieved.


I think Daniel Berlin had looked into this before and it only helped
x86 (small register set) and hurt all others.  I cannot find the
reference which mentions he did this right now.

-- Pinski

References:
- REG_NO_CONFLICT vs lower-subreg
  - From: Bernd Schmidt
- Re: REG_NO_CONFLICT vs lower-subreg
  - From: Paolo Bonzini

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