On Tue, Mar 27, 2012 at 7:28 PM, H.J. Lu <hjl.to...@gmail.com> wrote:
> GCC needs to move the value in the %fs segment
> register into %r32 or %r64. This instruction
>
> "mov{l}\t{%%fs:0, %k0|%k0, DWORD PTR fs:0}"
>
> does exactly what GCC wants.
Sorry, I really don't understand what you are trying to say.
You are loading ptrmode (so, void *) pointer from %fs:0 to a DImode
register. If you use movl, you can say that this instruction zero
extends the value (void *, ptrmode, SImode) from a memory location
pointed by %fs:0 to a DImode register. Please note the difference
between:
movl %fs:0, %eax
and
movl %fs, %eax.
BTW: %fs is a 16bit register.
Uros.
