On Thu, Dec 04, 2003 at 11:22:08PM -0700, Eric W. Biederman wrote: > > > > > > I would think it would hurt since x86 lets you use those little > > > sub-registers (puddle arithmetic), so using bigger registers reduces > > > the number of registers available. > > > > Yes, being able to use this from romcc would severely lower register > > pressure I assume. Neither romcc nor the code compiled with it takes > > care of this at the moment though. > > I tried this at one point. And the problem is that there > is not a instruction sequence to move to/from the byte registers > from a normal 32bit register.
Hmm, there's movzx and movsx for moving to 32 bit, but from 32 to 8 is worse for esi, edi and ebp. 32->16 works fine of course. I could be missing something though. :) //Peter _______________________________________________ Linuxbios mailing list [EMAIL PROTECTED] http://www.clustermatic.org/mailman/listinfo/linuxbios
