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Re: GCC ILP instruction scheduling?
- From: <tm_gccmail at kloo dot net>
- To: Yang Yang <yangyang at juggler dot ucsd dot edu>
- Cc: gcc at gcc dot gnu dot org
- Date: Tue, 9 Dec 2003 12:30:32 -0800 (PST)
- Subject: Re: GCC ILP instruction scheduling?
On Fri, 5 Dec 2003, Yang Yang wrote:
> hi folks:
> I'm reading something on ILP and instruction scheduling,
> while instruction scheduling is done by hardware
> in out-of-order machines, I'm thinking doing so first in
> software statically might introduce more opportunities
> for the hardware to find independent instructions, because
> independent insts are already scheduled closer
>
> a slide at the IMPACT site shows that gcc has very low ILP
> optimization. I'm not sure if this software/hardware combined
> approach would help.
>
> thanks
>
> Yang
You would be better off looking at the output code to determine why the
ILP is low instead of randomly hypothesizing the reasons for the symptoms.
Toshi