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Re: [0/3] Fix PR78120, in ifcvt/rtlanal/i386.

From: Eric Botcazou <ebotcazou at adacore dot com>
To: Bernd Schmidt <bschmidt at redhat dot com>
Cc: gcc-patches at gcc dot gnu dot org, Segher Boessenkool <segher at kernel dot crashing dot org>
Date: Thu, 24 Nov 2016 15:44:13 +0100
Subject: Re: [0/3] Fix PR78120, in ifcvt/rtlanal/i386.
Authentication-results: sourceware.org; auth=none
References: <e6d06b7a-831b-299a-5c5a-507e267238a4@redhat.com> <20161124143632.GE14394@gate.crashing.org> <1cd79d19-c745-c3e6-10ca-a53709e35e09@redhat.com>

> I'll make the argument that stage 3 is when we fix stuff, including
> performance regressions, and this patch is very clearly a fix. When we
> have very obvious distortions like a case where costs from insn_rtx_cost
> and seq_cost aren't comparable, it's impossible to arrive at sane solutions.

It would help to make a pass over the main architecture back-ends and evaluate 
the potential fallout and required adjustments, if any.

-- 
Eric Botcazou

References:
- [0/3] Fix PR71280, in ifcvt/rtlanal/i386.
  - From: Bernd Schmidt
- Re: [0/3] Fix PR78120, in ifcvt/rtlanal/i386.
  - From: Segher Boessenkool
- Re: [0/3] Fix PR78120, in ifcvt/rtlanal/i386.
  - From: Bernd Schmidt

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