I downloaded the patches to gcc2.7.2 and have been playing with the
pgcc compiler.  Some of my math code shows no improvement at all, which
makes me sad.  Some numbers though:

Drystone 2.1: 5,000,000 loops
CFLAGS = -O6 -m386 -funroll-all-loops

gcc2.4.5 : 137023.8 d/s
gcc2.7.2 : 137099.0 d/s
gcc2.7.2p: 158277.9 d/s
gcc2.7.2p: 158629.4 (with -mpentium)
gcc2.7.2p: 157728.7 (with -m486)

Gzip: source = 1130765 Mar 21 03:18 perl5.001.tar.gz
CFLAGS = -O3 -m386

gcc2.4.5 : 11.4u 0.1s 0:11.94 96.9% 0+0k 281+82io 0pf+0w
gcc2.7.2 : 11.1u 0.2s 0:11.56 98.0% 0+0k 283+83io 0pf+0w
gcc2.7.2p: 10.8u 0.1s 0:11.18 98.3% 0+0k 283+83io 0pf+0w
gcc2.7.2p: 10.7u 0.1s 0:11.13 98.4% 0+0k 282+83io 0pf+0w (-mpentium)
gcc2.7.2p: 10.4u 0.2s 0:10.86 97.7% 0+0k 285+78io 0pf+0w (and -O6)

-j