GCC trunk SPEC2000 performance

[Janis Johnson]

On Thu, Jun 20, 2002 at 11:16:50AM -0700, Richard Henderson wrote:
> 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.

-fprefetch-loop-arrays needs work to actually improve most programs.
Honza's description of it for 3.1 is that it's experimental, which is
still quite accurate.

Janis