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Re: [PATCH] Find more cases for AUTO_INC_DEC

From: Dale Johannesen <dalej at apple dot com>
To: Adam Nemet <anemet at lnxw dot com>
Cc: gcc-patches at gcc dot gnu dot org, Dale Johannesen <dalej at apple dot com>
Date: Mon, 18 Jul 2005 14:48:50 -0700
Subject: Re: [PATCH] Find more cases for AUTO_INC_DEC
References: <17113.28885.396452.961965@anemet1.lynx.com>

On Jul 16, 2005, at 1:40 PM, Adam Nemet wrote:

Hi,

Mainline has stopped optimizing the following function into stuw
(pre-increment) on PowerPC:

It turns out this is not necessarily the right thing to do on G5. The hardware "cracks" this insn into an add and a load internally anyway, and you may get better scheduling in some cases by allowing them to be separated. The recommendation of Apple's performance group was not to generate it at speed-oriented optimization levels. It it still a win on size, of course.

Follow-Ups:
- Re: [PATCH] Find more cases for AUTO_INC_DEC
  - From: Dale Johannesen

References:
- [PATCH] Find more cases for AUTO_INC_DEC
  - From: Adam Nemet

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