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Re: [rtl-optimization] Improve Data Prefetch for IA-64
- From: Canqun Yang <canqun at nudt dot edu dot cn>
- To: Steven Bosscher <stevenb at suse dot de>, gcc at gcc dot gnu dot org,gcc-patches at gcc dot gnu dot org
- Date: Mon, 28 Mar 2005 08:46:24 +0800 (HKT)
- Subject: Re: [rtl-optimization] Improve Data Prefetch for IA-64
- Reply-to: Canqun Yang <canqun at nudt dot edu dot cn>
ÒýÑÔ Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz>:
> Hello,
>
> > On Sunday 27 March 2005 04:45, Canqun Yang wrote:
> > > Another question is why the new RTL loop-
unroller does
> > > not support giv splitting.
> >
> > Apparently because for most people it is not a
problem that it does
> > not do it, and while you have indicated earlier
that it may be useful
> > for you, you have neither tried to implement it
yourself, nor provided
> > a test case to PR20376.
> >
> > FWIW you could try -fweb and see if it does what
you want. And if it
> > does, you could write a limited webizer patch that
works on just loop
> > bodies after unrolling.
>
> from what I understood, change to
analyze_iv_to_split_insn that would
> detect memory references should suffice. Also maybe
this patch might be
> relevant:
>
> http://gcc.gnu.org/ml/gcc-patches/2004-
10/msg01176.html
>
> Zdenek
>
I'll try this. Thanks a lot.
Canqun Yang
Creative Compiler Research Group.
National University of Defense Technology, China.