Re: ARM optimisation -- where to discuss?

[ng at piments dot com]

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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