Mathieu Desnoyers wrote:
quoted text
> 
> Ok, so the most flexible solution that I see, that should fit for both
> i386 and x86_64 would be :
> 
> 
> 1 byte  : "=Q" : Any register accessible as rh: a, b, c, and d.
> 2, 4 bytes : "=R" : Legacy register—the eight integer registers available
>                  on all i386 processors (a, b, c, d, si, di, bp, sp). 
> 8 bytes : (only for x86_64)
>           "=r" : A register operand is allowed provided that it is in a
>                  general register.
> 
> That should make sure x86_64 won't try to use REX prefixed opcodes for
> 1, 2 and 4 bytes values.
> 
> Does it make sense ?
> 

That's probably the best bet.

	-hpa
-
unsubscribe notice
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/