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Re: [PATCH vs] Take known zero bits into account when checking extraction.

From: Bernd Schmidt <bschmidt at redhat dot com>
To: vogt at linux dot vnet dot ibm dot com, gcc-patches at gcc dot gnu dot org, Andreas Krebbel <krebbel at linux dot vnet dot ibm dot com>, Ulrich Weigand <Ulrich dot Weigand at de dot ibm dot com>, Jeff Law <law at redhat dot com>
Date: Wed, 11 May 2016 10:40:11 +0200
Subject: Re: [PATCH vs] Take known zero bits into account when checking extraction.
Authentication-results: sourceware.org; auth=none
References: <20160427082004 dot GE5082 at linux dot vnet dot ibm dot com> <20160510130655 dot GA4308 at linux dot vnet dot ibm dot com> <5731F8A2 dot 6090202 at redhat dot com> <20160511074258 dot GA2730 at linux dot vnet dot ibm dot com>

On 05/11/2016 09:42 AM, Dominik Vogt wrote:

On Tue, May 10, 2016 at 05:05:06PM +0200, Bernd Schmidt wrote:

Earlier in the discussion you mentioned the intention to remove
these costs. Nothing else in the function does cost calculations -
maybe you can try placing a gcc_unreachable into the case where the
costs would prevent the transformation to see if it ever triggers.


You mean to try it out locally or as part of the patch?

I meant try it out locally. I'm almost certain the patch shouldn't betrying to use costs here.



Bernd

Follow-Ups:
- Re: [PATCH vs] Take known zero bits into account when checking extraction.
  - From: Dominik Vogt

References:
- Re: [PATCH vs] Take known zero bits into account when checking extraction.
  - From: Dominik Vogt
- Re: [PATCH vs] Take known zero bits into account when checking extraction.
  - From: Bernd Schmidt
- Re: [PATCH vs] Take known zero bits into account when checking extraction.
  - From: Dominik Vogt

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