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Re: Compilation performance comparison of 3.5.0 and TreeSSA treeson MICO sources as requested in: [tree-ssa] Merge status 2004-05-03
- From: Laurent GUERBY <laurent at guerby dot net>
- To: Joe Buck <Joe dot Buck at synopsys dot COM>
- Cc: Robert Dewar <dewar at gnat dot com>, dnovillo at redhat dot com, gcc at gcc dot gnu dot org, kenner at vlsi1 dot ultra dot nyu dot edu
- Date: Wed, 05 May 2004 20:49:18 +0200
- Subject: Re: Compilation performance comparison of 3.5.0 and TreeSSA treeson MICO sources as requested in: [tree-ssa] Merge status 2004-05-03
- References: <20040505174211.EEDB3F2A09@nile.gnat.com> <1083780566.25832.34.camel@pc> <20040505113525.A15763@synopsys.com>
On Wed, 2004-05-05 at 20:35, Joe Buck wrote:
> The purpose of doing some optimization is to make -O0 *faster*. We've
> already got a 20% speed degradation any you want to allow 5% *more*?
You want to allow some room IMHO:
- there will always be some cases where -Og is slower than -O0
and we don't want endless case by case discussions
- If the generated file size is reduced by 50% for 10% longer compile
time, I'd like to get such things in.
Nobody will notice 44 minutes vs 40 minutes of full app compilation,
everyone in a edit/compile one file/link full app/debug cycle will
notice immediately a 50% reduction in link time.