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Re: [PATCH] Match x86 family machine constraints section with constarints.md

From: Sandra Loosemore <sandra at codesourcery dot com>
To: "Peryt, Sebastian" <sebastian dot peryt at intel dot com>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: "ubizjak at gmail dot com" <ubizjak at gmail dot com>, "Koval, Julia" <julia dot koval at intel dot com>, "kirill dot yukhin at gmail dot com" <kirill dot yukhin at gmail dot com>
Date: Tue, 23 May 2017 09:33:58 -0600
Subject: Re: [PATCH] Match x86 family machine constraints section with constarints.md
Authentication-results: sourceware.org; auth=none
References: <17623B198193D741876BD81A6E3AE5AD3BBAF0D4@irsmsx105.ger.corp.intel.com> <590251D7.60009@codesourcery.com> <17623B198193D741876BD81A6E3AE5AD3BBAF50A@irsmsx105.ger.corp.intel.com>

On 04/28/2017 03:30 AM, Peryt, Sebastian wrote:

Hi,

Thank you for your comments. I edited my patch accordingly. As for some of your doubts:
- REX is  the opcode prefix to access 64-bit register extensions introduced in IA-32e mode.
- EVEX is the encoding prefix which applies to SIMD operating instructions operating on XMM, YMM and ZMM registers. It was introduced with AVX-512 instructions.
- "number factor of four" that means that sources start in a multiple of 4 boundary. This is used for some of instructions.

Also I'd like to add that this whole patch is strictly based on docstring parts of constraints that are present in config/i386/constraints.md but not in documentation (md.texi file). There is no new (new as in nonexistent in code) content.

I'm also adding Kirill Yukhin to CC, because I believe he is the correct person that can catch any technical errors if any has slipped-in.

The grammar/markup/etc are OK now, but I can't comment on technicalcorrectness of the information.


-Sandra

Follow-Ups:
- Re: [PATCH] Match x86 family machine constraints section with constarints.md
  - From: Uros Bizjak

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