Feature request concerning opcodes in the function prolog

[H.J. Lu]

On Wed, Jan 7, 2009 at 10:05 AM, Stefan Dösinger <stefan@codeweavers.com> wrote:

>
> I talked to the binutils maintainers and they helped me by adding a new
> instruction suffix .s:
> movl    %esp, %ebp   => 89 e5
> movl.s  %esp, %ebp   => eb ec
>
> Now I need gcc to set this suffix, but here I am pretty lost. I haven't
> found out yet how to add this to the gcc code. The other issue is
> compatibility with old binutils versions, since so far this feature is in
> svn only and no release has it. Does gcc attempt to detect binutils
> features, or does it just assume that everything it needs is there?
>

You need to check assembler feature with autconf before using them.
See HAVE_AS_IX86_SAHF as example.

FWIW, Linux binutils 2.19.51.0.1 supports .s suffix.

-- 
H.J.