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Re: GCC trunk SPEC2000 performance
- From: Richard Henderson <rth at redhat dot com>
- To: David Edelsohn <dje at watson dot ibm dot com>
- Cc: Mark Mitchell <mark at codesourcery dot com>, gcc at gcc dot gnu dot org
- Date: Thu, 20 Jun 2002 11:16:50 -0700
- Subject: Re: GCC trunk SPEC2000 performance
- References: <200206200243.WAA23358@makai.watson.ibm.com>
On Wed, Jun 19, 2002 at 10:43:40PM -0400, David Edelsohn wrote:
> 2) "peak" (-O3 -funroll-all-loops -fprefetch=loop-arrays) produces slower
> code than base (-O2) for many tests.
Peak cannot be considered "peak" with -funroll-all-loops
as opposed to -funroll-loops. That forces the compiler
to unroll a loop against its better judgement.
It's good for correctness testing, however.
r~