On Mon, Mar 19, 2012 at 9:49 AM, Uros Bizjak <ubiz...@gmail.com> wrote:
> On Mon, Mar 19, 2012 at 5:47 PM, H.J. Lu <hjl.to...@gmail.com> wrote:
>> For x32, thread pointer is an unsigned 32bit value.
>> movl %fs:0, %eax
>> is the correct instruction to load thread pointer into EAX and RAX.
> So, where is ZERO_EXTEND RTX then?
Thread pointer (TP) is an opaque value to GCC. GCC needs to load
TP into a SImode or DImode register. ZERO_EXTEND isn't needed
when there is a single instruction to load TP into a DImode register.