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Re: PATCH: Fix CSE handling of COMPARE

To: Franz dot Sirl-kernel at lauterbach dot com
Subject: Re: PATCH: Fix CSE handling of COMPARE
From: Mark Mitchell <mark at codesourcery dot com>
Date: Tue, 20 Mar 2001 09:01:11 -0800
Cc: gcc-patches at gcc dot gnu dot org, Richard Kenner <kenner at vlsi1 dot ultra dot nyu dot edu>
Organization: CodeSourcery, LLC
References: <01032000164800.02686@enzo.bigblue.local><20010319153136V.mitchell@codesourcery.com><5.0.2.1.2.20010320141704.02310ec0@mail.lauterbach.com>

>>>>> "Franz" == Franz Sirl <Franz.Sirl-kernel@lauterbach.com> writes:

    Franz> Sorry, I shouldn't have been that terse, the _first_ call
    Franz> to __bad_udelay() isn't optimized away with -O2 and I fear

Kenner has volunteered to take a look at this, which is good, because
he may make more progress than I.

He's already validated the change that I made as being correct.

So, this *is* a regression -- but it may not be one we can do much
about, if the only way we have to get the good optimization is to
generate wrong code sometimes.

Kenner is going to look at other approaches to getting the same
optimization, which would be good.

Thanks,

--
Mark Mitchell                   mark@codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com

Follow-Ups:
- Re: PATCH: Fix CSE handling of COMPARE
  - From: Franz Sirl

References:
- Re: PATCH: Fix CSE handling of COMPARE
  - From: Franz Sirl
- Re: PATCH: Fix CSE handling of COMPARE
  - From: Mark Mitchell
- Re: PATCH: Fix CSE handling of COMPARE
  - From: Franz Sirl

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