On Fri, Apr 15, 2005 at 11:18:08AM +0100, Dominic Sweetman wrote: > > > And doesn't 64 bit mode have costs of its own (doubled i-fetch bandwidth > > > for starters)? > > 64-bit MIPS CPUs still have 32-bit instructions... it's the registers > and addressing range which grow, not the instructions. True - but number of instructions will grow, thus the bandwidth needed to fetch them. > Program data segments tend to grow when you use 64-bit pointers (N64 > does, but N32 - paradoxically still a 64-bit ABI - doesn't) N32 is an ILP32 ABI so I'd count it as 32-bit. Ralf
