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Re: GCSE store motion
- From: Mark Mitchell <mark at codesourcery dot com>
- To: Robert Dewar <dewar at gnat dot com>, "dberlin at dberlin dot org" <dberlin at dberlin dot org>, "roger at eyesopen dot com" <roger at eyesopen dot com>
- Cc: "aj at suse dot de" <aj at suse dot de>, "davem at redhat dot com" <davem at redhat dot com>, "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>, "rth at redhat dot com" <rth at redhat dot com>
- Date: Wed, 15 May 2002 12:34:37 -0700
- Subject: Re: GCSE store motion
- References: <20020515192929.344A0F2942@nile.gnat.com>
--On Wednesday, May 15, 2002 03:29:29 PM -0400 Robert Dewar
<dewar@gnat.com> wrote:
> < If the optimization makes the compiler go slower when compiling itself,
> it ain't worth having.
>>
>
> I think that's much too harsh.
I'd tried to make clear I didn't mean it literally, or as an absolute.
> For example a thorough job of software loop
> pipelining using the rotating registers of the ia64 may require *quite*
> a bit of compilation time, and since this optimization is unlikely to help
> GCC itself much that seems unfortunate.
That means we shouldn't be spending much time trying to do software
loop pipelining when compiling GCC, so the optimization shouldn't
make compiling the compiler significantly slower.
--
Mark Mitchell mark@codesourcery.com
CodeSourcery, LLC http://www.codesourcery.com