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Re: GCC trunk SPEC2000 performance
- From: David Edelsohn <dje at watson dot ibm dot com>
- To: Richard Henderson <rth at redhat dot com>
- Cc: Mark Mitchell <mark at codesourcery dot com>, gcc at gcc dot gnu dot org
- Date: Thu, 20 Jun 2002 14:19:32 -0400
- Subject: Re: GCC trunk SPEC2000 performance
>>>>> Richard Henderson writes:
Richard> Peak cannot be considered "peak" with -funroll-all-loops
Richard> as opposed to -funroll-loops. That forces the compiler
Richard> to unroll a loop against its better judgement.
That assumes that the compiler's judgment is good, which it has
not been in the past. I have seen better performance with
-funroll-all-loops than with -funroll-loops. That option is not what is
causing base and peak to be inverted.
David