Gas can't handle prefix generated by gcc

[Zack Weinberg]

"H. J. Lu" <hjl@lucon.org> writes:

> On Fri, Jul 23, 2004 at 01:43:33PM -0700, Zack Weinberg wrote:
>> "H. J. Lu" <hjl@lucon.org> writes:
>> 
>> > On Fri, Jul 23, 2004 at 12:49:48PM -0700, Zack Weinberg wrote:
>> >> Zack Weinberg <zack@codesourcery.com> writes:
>> >> 
>> >> > "H. J. Lu" <hjl@lucon.org> writes:
>> >> >
>> >> >> It seems that gcc uses a prefix syntax which gas doesn't handle. Does
>> >> >> gcc always use " ; " as prefix separator?
>> >> >
>> >> > Yes.  It does that for cs/ds on branch hints, it does that for "rep"
>> >> > on string instructions, it does that for "lock" on atomic updates.
>> >> 
>> >> Correction - it uses either " ; " or \n\t in all the above cases.
>> >> 
>> >
>> > It looks like a gcc bug to me. Assembler has a way to define prefixes
>> > for an instruction. Unfortunately, gcc uses something else. I will
>> > close the assembler bug.
>> 
>> Not so fast.  Is the PREFIX_SEPARATOR mechanism (a) supported by GAS
>> since time immemorial, and (b) supported by all other i386 assemblers
>> since time immemorial?  If *either* of those is not true, GCC can't
>> change.
>
> It was added to gas on Jun 8, 1998.

Ok, that's good enough.  Now how about (b)?

zw