Which compiler is best, recommended, etc. Does one compiler optimize for Pentium, PentiumMMX, PentiumII, K6, K6-2, Cyrix 6x86MX, Cyrix MII, IDT Winchip6(-2). I know Swarc does the different MMX flavours and is working on 3Dnow! (by using a variant on C). But will EGCC / PGCC ever support these??