On Wed, Apr 6, 2011 at 10:01 AM, Philipp Klaus Krause <p...@spth.de> wrote:
> Dear users of the Z80 port,
>
> I've been working on a new register allocator for some months.
>
> The current protoype already generates better code than current 'normal'
> sdcc in most cases. A code size reduction of about 10% seems typical.
>
> A small benchmark can be found at
> https://sourceforge.net/apps/trac/sdcc/wiki/Philipp%27s%20TODO%20list,
> where the rightmost column gives the code sizes for the new allocator.
> As you can see, with the new allocator sdcc in most cases generates
> smaller code than all other compilers, including the last HITECH-C compiler.
>
> You can download sdcc with the new allocator from
> http://colecovision.eu/stuff/sdcc-or-2011-4-6.tar.gz. I have worked on
> fixing bugs for about a week; all regression tests complete without
> errors, and my own Z80 applications work when compiled with this version.
>
> However it's likely that there are still lots of bugs, thus it needs
> testing. Please test this version of sdcc on your code, and tell me
> about any problems you encounter.
>
> A short description of the command line options you might want to try:
>
> --optralloc-exact-cost : Use an exact cost function. This should
> generate slightly better code than without this option.
>
> --max-allocs-per-node : Higher values result in better code, at the cost
> of longer compile time (and higher memory usage during compilation). The
> default value is 10000.
>
> --opt-code-size : Optimize for code size instead of speed. Currently has
> a relatively small impact on the code generated.
>
> --no-peep : Disables the peephole optimizer. When there's a problem that
> goes away when using --no-peep it's most likely a bug in the peephole
> optimizer or the peephole rules.
>
> Philipp

Looks promising. I'll try to test it against my code sometime this week/weekend.

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