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Re: SSE2 benchmarks
- To: Paolo Carlini <pcarlini at unitus dot it>
- Subject: Re: SSE2 benchmarks
- From: Jan Hubicka <jh at suse dot cz>
- Date: Mon, 2 Jul 2001 23:04:36 +0200
- Cc: Jan Hubicka <jh at suse dot cz>, gcc at gcc dot gnu dot org, tprince at computer dot org
- References: <3B3CA9C2.42FB2E9B@unitus.it> <004b01c101a6$dce6b2b0$9865fea9@timayum4srqln4> <20010702113847.C3390@atrey.karlin.mff.cuni.cz> <3B40471C.E522E6C8@unitus.it>
> Hi all, hi Jan, hi Tim, and thanks for your feedback.
>
> In the meanwhile, I have downloaded the original flops.c code and tried
> compiling and running it.
>
> If you are interested I may post the results for my PII (no SSE or SSE2,
> unfortunately).
>
> Anyway, what do you (people knowing well GCC's x86 backend) expect? I mean, in
> those simple float loops how GCC is supposed to compare to other widespread
> compilers?
>
> I'm asking this because some *preliminary* results seem to indicate that VC6
> (under Windoze98) is appreciably better than both 2.95.x and 3.0 ;-)
Well, it depends on the loop. But if it is resonably simplem I can take
a look at it and see what I can do :)
Don't forget to try -funroll-all-loops/ -ffast-math and similar tricks.
Also possibly your stack is missaligned at main level.
Honza