[PD-dev] double precision Pd: .patch files, tests and benchmarks

[katja]

Hello,

Happy to see so many test results from IOhannes.

The 'perfotest' patches were initially created for function profiling,
to check if there are particularly time consuming instructions. To
mention a funny example: I was happy to see that fabs() was translated
to a single instruction ANDPS / ANDPD for xmm registers. But for the
FPU it is a call. The same for isnan(). That's why PD_BIGORSMALL must
still do a bitpattern check on aliased floats.

For benchmarking original and double-ready Pd as a whole, I used two
(fairly cool and elaborate) patches which were written in pure
vanilla:

- Chaosmonster1 from www.martin-brinkmann.de (10 instances or so)
- Cave of Creation by Hamster, http://puredata.hurleur.com/sujet-5080-2.html

Both works feature enough of the rewritten code to make them
representative overall benchmarks. If double-ready Pd performs as well
as original Pd with usual compiler settings, on all possible
platforms, I would be satisfied. After all, the purpose of the whole
thing was to get some more decimal places in our numbers, not to make
Pd run faster.

Katja