[Mono-dev] Current status of global regalloc (regalloc2.c)

Zoltan Varga vargaz at gmail.com
Tue Sep 14 13:46:55 EDT 2010


  If you want better performance, I suggest looking at the the llvm backend:



On Tue, Sep 14, 2010 at 3:58 PM, Sergei Dyshel <qyron.private at gmail.com>wrote:

> Hi,
> What is the current status of this feature? The regalloc2.c file wasn't
> substantially updated during last couple of years. Some citations from the
> file's comments section:
> Focus was on correctness and easy debuggability so *performance is bad*
> Bad related to what? I've tried both schemes, current vs globalra, on some
> computationally-intensive kernels and globally-allocated version seems
> always to run faster, even with x2-x3 speedups in case of floating-point
> kernels. Is this supposed behavior?
> Only works on amd64
> Is this true for now? I'm actually interested in 32-bit x86 and PowerPC
> back-ends. How much is required to make globalra work for them too? There
> are relatively few places where globalra is used in 'mini-amd64.c' so it
> doesn't seem hard to port these changes to 'mini-x86.c'.
> In my project I only need to execute very simple small computational
> kernels, with no arguments, no calls to another functions (hence no need to
> distinguish between callee/caller saved registers), only global static
> arrays are used?
> Any answers/comments are greatly appreciated!
> --
> Regards,
> Sergei Dyshel
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