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Re: Re: [Fwd: GCC2C compiler/converter]
- From: Alexey Starovoytov <starlex at eng dot sun dot com>
- To: <gcc at gcc dot gnu dot org>
- Cc: <dberlin at dberlin dot org>
- Date: Tue, 16 Jul 2002 18:23:59 -0700 (PDT)
- Subject: Re: Re: [Fwd: GCC2C compiler/converter]
- Reply-to: <gcc2c at sun dot com>
Hi David,
> > > This converter will be very helpful to developers who use GCC but want
> > > enhanced performance on UltraSPARC platforms, particularly the US-III.
> > > GCC 3.x has no support for US3 prefetch cache or other US3 specific
> > > features. The number of supported optimizations in GCC is significantly
> > > lower than in Forte. This converter delivers the best from both.
> Not true, loop prefetch for Ultra-I/II/III exists even in the current
> 3.1 sources. The mainline even has an Ultra-III specific scheduler
> description.
GCC 3.1 doesn't see a difference between Ultra 1, 2 and 3.
Some commercial applications saw 2x gains just recompiling from US2 to US3.
>
> It's also not true that the "number of supported optimizations in GCC is
> significantly lower than in Forte".
That's what the Nullstone bench 4.7 said:
GCC - 68%
Forte - 85%
Best regards,
Alexey.