GCC ILP instruction scheduling?

[tm_gccmail@kloo.net]

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