
Reviewed-by: Matt Caswell <matt@openssl.org> (cherry picked from commit 3be39dc1e3378d79531e385a72051c4dc5c6b34d)
There is a ppro flag in cast-586 which turns on/off generation of pentium pro/II friendly code This flag makes the inner loop one cycle longer, but generates code that runs %30 faster on the pentium pro/II, while only %7 slower on the pentium. By default, this flag is on.