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Re: Combiner fix for PR79910

From: Segher Boessenkool <segher at kernel dot crashing dot org>
To: Bernd Schmidt <bschmidt at redhat dot com>
Cc: Jeff Law <law at redhat dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Fri, 17 Mar 2017 17:16:29 -0500
Subject: Re: Combiner fix for PR79910
Authentication-results: sourceware.org; auth=none
References: <15d38062-fd33-7de7-5bba-79f17adefc65@redhat.com> <f2839771-ec35-5096-7202-e5f29efa3d82@redhat.com> <5c9df1bf-65b3-c5bc-c350-f82466c3659b@redhat.com>

On Wed, Mar 15, 2017 at 12:09:18AM +0100, Bernd Schmidt wrote:
> I suppose at the moment we don't do 2->2 combinations, so we could 
> conditionalize this on having an i1.

You suppose wrong.  If one of the resulting insns is set_noop_p then
2->2 is allowed, for example.  Also in the hopefully not so far future
we will allow 2->2 in general.

Segher

Follow-Ups:
- Re: Combiner fix for PR79910
  - From: Jeff Law

References:
- Combiner fix for PR79910
  - From: Bernd Schmidt
- Re: Combiner fix for PR79910
  - From: Jeff Law
- Re: Combiner fix for PR79910
  - From: Bernd Schmidt

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