Pentium 100
Free BSD 2.1.5 kernel
gcc 2.7.2.2 -O3 -fomit-frame-pointer
options    des ecb/s
assember   578000.00 133.1%
16 r2 i    434454.80 100.0%
16 r1 i    433621.43  99.8%
16 r2 p    431375.69  99.3%
 4 r1 i    423722.30  97.5%
 4 r2 i    422399.40  97.2%
16 r1 p    421739.40  97.1%
16  c i    399027.94  91.8%
16  c p    372251.70  85.7%
 4  c i    365118.35  84.0%
 4  c p    352880.51  81.2%
 4 r2 p    255104.90  58.7%
 4 r1 p    251289.18  57.8%
-DDES_UNROLL -DDES_RISC2