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Re: [patch] arm: Generate MLA and MLS more.

From: Paolo Bonzini <bonzini at gnu dot org>
To: Kazu Hirata <kazu at codesourcery dot com>
Cc: gcc-patches at gcc dot gnu dot org, nickc at redhat dot com, richard dot earnshaw at arm dot com, paul at codesourcery dot com
Date: Mon, 21 Dec 2009 11:04:13 +0100
Subject: Re: [patch] arm: Generate MLA and MLS more.
Newsgroups: gmane.comp.gcc.patches
References: <20091220203751.2DE6C6F6226F@daisy.codesourcery.com>

On 12/20/2009 09:37 PM, Kazu Hirata wrote:

I thought about having the combiner do this splitting.  It does a
little bit of heuristic-based splitting, but it doesn't do this exact
split.

You mean in find_split_point? Given that the canonicalization effectively is already reordering the instructions, 90% of the work is already done.

I'm thinking about something like the attached patch; unfortunately without a testcase for your change, I cannot test it myself. Anyway, the multiply-accumulate case does not look that much architecture-dependent.

Paolo

Attachment: gcc-mla-mls.patch
Description: Text document

Follow-Ups:
- Re: [patch] arm: Generate MLA and MLS more.
  - From: Kazu Hirata

References:
- [patch] arm: Generate MLA and MLS more.
  - From: Kazu Hirata

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