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Re: regrename speedup

From: Bernd Schmidt <bernds_cb1 at t-online dot de>
To: Eric Botcazou <ebotcazou at adacore dot com>
Cc: gcc-patches at gcc dot gnu dot org, "H.J. Lu" <hjl dot tools at gmail dot com>
Date: Mon, 30 Nov 2009 14:19:27 +0100
Subject: Re: regrename speedup
References: <4AD9CEF2.50908@t-online.de> <200911280946.58991.ebotcazou@adacore.com> <4B13B1BC.7090602@t-online.de> <200911301310.19822.ebotcazou@adacore.com>

Eric Botcazou wrote:
>> Looks like it isn't handling register sets in COND_EXPRs correctly.
> 
> Was this latent in the previous implementation?  The code does explicitly 
> handle COND_EXECs in a few places.
> 
Yes, but by unconditionally setting them to INOUT operands, we are
missing cases where the first SET makes a register live, so we don't
create a chain for it or mark a hard register as live.

So I'm thinking we should set these operands to INOUT only if it's
already being tracked.

Bernd
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References:
- Re: regrename speedup
  - From: Eric Botcazou
- Re: regrename speedup
  - From: Bernd Schmidt
- Re: regrename speedup
  - From: Eric Botcazou

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