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Re: Question about "instruction merge" pass when optimizing for size

From: Jeff Law <law at redhat dot com>
To: DJ Delorie <dj at redhat dot com>, "sarah at hederstierna dot com" <fredrik at hederstierna dot com>
Cc: gcc at gcc dot gnu dot org
Date: Wed, 19 Aug 2015 15:07:22 -0600
Subject: Re: Question about "instruction merge" pass when optimizing for size
Authentication-results: sourceware.org; auth=none
References: <CE36BD26828FA5408B9F87E4DD2ACB0B0135774D9F16 at MBXVS01 dot HMC dot local> <4ad27b0cf3dd4b12a4a2a4530ce2f15a at DAG03 dot HMC dot local> <201508192038 dot t7JKcVV7000807 at greed dot delorie dot com>

On 08/19/2015 02:38 PM, DJ Delorie wrote:

I've seen this on other targets too, sometimes so bad I write a quick
target-specific "stupid move optimizer" pass to clean it up.

A generic pass would be much harder, but very useful.

More important is to determine *why* we're getting these patterns. Inthe IRA/LRA world, they should be a lot less common.


Jeff

Follow-Ups:
- Re: Question about "instruction merge" pass when optimizing for size
  - From: sarah at hederstierna dot com

References:
- Question about "instruction merge" pass when optimizing for size
  - From: sarah at hederstierna dot com
- Re: Question about "instruction merge" pass when optimizing for size
  - From: DJ Delorie

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