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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: Gerald Pfeifer <gerald at pfeifer dot com>
- To: Joe Buck <Joe dot Buck at synopsys dot COM>
- Cc: Laurent GUERBY <laurent at guerby dot net>,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, 5 May 2004 23:18:06 +0200 (CEST)
- 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, 5 May 2004, 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*?
To illustrate Joe's point, and excerpt from one of my Makefiles:
# (-O1 is required for some warning invoked by -W, and it is indeed
# faster than -O0 as of 2001-08-30 on i386-unknown-freebsd4.3.)
> Applying some low-cost optimizations for space will make the
> compiler+assembler+linker run *faster*.
Indeed.
Gerald