Patch for PPC 4xx soft float primitives

[Daniel Kegel]

Xavier Miville wrote:
> Hi, I've made a patch for GCC using soft-float primitives for PPC 4xx
> taken from the IBM PowerPC Performance Libraries Project
> (http://www-124.ibm.com/developerworks/projects/ppcperflib/).
> 
> The project is licensed with BSD License terms, so I don't know the
> chances of this patch being merged into the GCC project.
> 
> It replaces the soft float emulation of GCC used for PPC targets. I did
> not run the GCC regression tests and I'm still working on this. But I
> did ran some of the IEEE 754 floating-point tests (i.e. paranoia) on a
> GCC 3.3.2 crosstool-0.25 generated toolchain for 405 and everything
> seemed fine. I do not have access to a 440 right now, but I've modified
> the config.gcc file so it applies to both 405 and 440.
> 
> You can expect an average 300% performance gain for float ops

Sounds great!   In order to contribute this to the main gcc tree,
both you and IBM would need to fill out a copyright assignment
form for this work.  IBM has done that in the past for GCC contributions,
so perhaps you could contact the IBM'ers that have submitted patches
to GCC and see what they say.

Once you have the gcc regression tests passing, you should definitely
put together a little web page about this patch and the test results,
and post a note with the URL both here and to gcc@gcc.gnu.org.
- Dan

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