Re: GCC viciously beaten by ICC in trig test!

[Daniel Berlin <dberlin at dberlin dot org>]

On Mar 14, 2004, at 8:39 PM, Scott Robert Ladd wrote:

> Paolo Carlini wrote:
> > I don't have ready at hand tree-ssa but I have lno-branch and the 
> > below
> > are my numbers (P4-2400)
> > (-O2 -std=c99 -fomit-frame-pointer -ftree-loop-optimize 
> > -fscalar-evolutions
> > -funroll-loops)
>
> Hmm... I haven't tried the lno-branch compiler. Lord knows, there 
> aren't
> enough versions of GCC on my system already (12 at last count). I *am*
> looking forward to vectorization.
>
> According to the GCC docs, -ftree-loop-optimize is enabled at -O
?

tree-loop-optimize is new to the lno branch.

>  and
> higher. I'm not familiar with -fscalar-evolutions.
It's actually just turning on analysis.
You don't need it, as the passes that require it (linear loop 
transforms, vectorization) already turn it on automatically.