[Portaudio] pa_mac_core and gcc3.1 performance test

[Darren Gibbs]

Howdy,

For giggles I just downloaded the new Mac OS X developer tools install 
which included a beta of the gcc3.1 compiler.  I grabbed the latest 
portaudio snapshot and ran patest_maxsines.c to see what happened.

Tests were run on a TiBook667 with Mac OS X 10.1.4.

WIth gcc2.95 and no optimization I got 51 sines.  With gcc2.95 and the 
-03 flag set I got 115 sines.  With gcc3.1 and -03 I got 161 sines... 
not a mindblowing improvement, but ~30% for free is better'n a kick in 
the head.  Apple claims they haven't extensively worked on codegen for 
gcc3.1 yet, so it'll get even better eventually.

BTW, I was unable to build the v17 version of portaudio with 
pa_mac_core.c.  I was getting link errors because it was missing 
*convert* symbols.  I looked at the nightly snapshot and found 
pa_convert.c so I added it to the stock v17.  But then it wouldn't build 
because of undefined types in pa_convert.c.  Are v17 and pa_mac_core.c 
not friendly? The nightly snapshot built fine.