This is the mail archive of the
gcc@gcc.gnu.org
mailing list for the GCC project.
Re: Gas can't handle prefix generated by gcc
"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.
zw