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Re: RFC/RFA: Fix bug with REE optimization corrupting extended registers

From: Bernd Schmidt <bschmidt at redhat dot com>
To: Nick Clifton <nickc at redhat dot com>, gcc-patches at gcc dot gnu dot org, Jeff Law <law at redhat dot com>
Date: Thu, 19 Nov 2015 17:53:14 +0100
Subject: Re: RFC/RFA: Fix bug with REE optimization corrupting extended registers
Authentication-results: sourceware.org; auth=none
References: <87d1v7v1g9 dot fsf at redhat dot com> <564D1D3B dot 9070609 at redhat dot com> <564DEBF9 dot 5030308 at redhat dot com>

On 11/19/2015 04:34 PM, Nick Clifton wrote:

Hi Bernd,

I had a look around. There's code testing HARD_REGNO_NREGS in
ree.c:combine_set_extension. It's inside #if 0, and labelled
"temporarily disabled". See if enabling that helps you? (Jeff, that #if
0 was added by you).


I suspect that the code was disabled because it prevented too many
useful optimization opportunities.

Well, correctness goes first. Since reenabling it fixes your problem,that change is approved (conditional on testing as usual obviously).



Bernd

Follow-Ups:
- Re: RFC/RFA: Fix bug with REE optimization corrupting extended registers
  - From: Jeff Law

References:
- RFC/RFA: Fix bug with REE optimization corrupting extended registers
  - From: Nick Clifton
- Re: RFC/RFA: Fix bug with REE optimization corrupting extended registers
  - From: Bernd Schmidt
- Re: RFC/RFA: Fix bug with REE optimization corrupting extended registers
  - From: Nick Clifton

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