ARM optimisation -- where to discuss?
ng@piments.com
ng@piments.com
Mon Jun 1 13:06:00 GMT 2009
Michael Abbott wrote:
> I'm seeing some ARM optimisation weaknesses (with gcc 4.3.2, so perhaps
> I'm behind the times) and I was wondering if anyone on this list knows a
> good place to report and discuss this?
>
> The sort of things I'm seeing are: poor register allocation resulting in
> unecessary register spillage, not taking __builtin_expect seriously
> enough, and unnecessarily preloading a constant into a register so
> spilling yet another register! It's just one bit of tight code where I
> was paying particular attention to timing.
>
> Anyhow, probably a bit off topic, but I'm sure some folk here know what
> I'm talking about.
>
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>
>
HI,
since you are clearly concerned about what the compiler is producing I
would have thought the best place to ask that question was on gcc devel
ML. They probably have a specific ARM list as well.
gcc@gcc.gnu.org
since 4.4 has been out for several weeks now you may like to compare
results with that output before firing bugs at them.
maybe ct-ng could make building a new toolchain easy. IIRC the latest
release inclused gcc 4.4
regards.
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