On Wed, Dec 06, 2006 at 08:43:17AM -0800, Randy Dunlap wrote: > On Tue, 5 Dec 2006 23:00:14 -0800 H. J. Lu wrote: > > > On x86, the order of prefix SEG_PREFIX, ADDR_PREFIX, DATA_PREFIX and > > LOCKREP_PREFIX isn't fixed. Currently, gas generates > > > > LOCKREP_PREFIX ADDR_PREFIX DATA_PREFIX SEG_PREFIX > > > > I will check in a patch: > > > > http://sourceware.org/ml/binutils/2006-12/msg00054.html > > > > tomorrow and change gas to generate > > > > SEG_PREFIX ADDR_PREFIX DATA_PREFIX LOCKREP_PREFIX > > Hi, > Could you provide a "why" for this in addition to the > "what", please?
LOCKREP_PREFIX is also used as SIMD prefix. DATA_PREFIX can be used as either SIMD prefix or data size prefix for SIMD instructions. The new order SEG_PREFIX ADDR_PREFIX DATA_PREFIX LOCKREP_PREFIX will make SIMD prefixes close to SIMD opcode. H.J.