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RE: [PATCH, MIPS] 74k tuning for divide traps

From: Jim Wilson <wilson at codesourcery dot com>
To: "Fu, Chao-Ying" <fu at mips dot com>
Cc: gcc-patches at gcc dot gnu dot org
Date: Wed, 14 Apr 2010 16:12:58 -0700
Subject: RE: [PATCH, MIPS] 74k tuning for divide traps
References: <1270852396.2611.17.camel@localhost> <94BD67F8AF3ED34FA362C662BA1F12C502BB5F1D@MTVEXCHANGE.mips.com> <1271281615.2620.11.camel@localhost> <94BD67F8AF3ED34FA362C662BA1F12C502BB5F2A@MTVEXCHANGE.mips.com>

On Wed, 2010-04-14 at 15:11 -0700, Fu, Chao-Ying wrote:
>   This involves the replay penalty of teq on 74k, when
> teq's operand is from a load and there is a load miss.

OK.  This is helpful and makes some sense.  I was able to write a little
testcase with this info and confirm that it runs faster with the trap
before the divide.  I revised the patch to include a comment explaining
what is going on.

Jim

Attachment: trap-div.patch.2
Description: Text document

References:
- [PATCH, MIPS] 74k tuning for divide traps
  - From: Jim Wilson
- RE: [PATCH, MIPS] 74k tuning for divide traps
  - From: Fu, Chao-Ying
- RE: [PATCH, MIPS] 74k tuning for divide traps
  - From: Jim Wilson
- RE: [PATCH, MIPS] 74k tuning for divide traps
  - From: Fu, Chao-Ying

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