On Wed, Jul 27, 2011 at 3:09 PM, Uros Bizjak <ubiz...@gmail.com> wrote:
> On Wed, Jul 27, 2011 at 3:00 PM, H.J. Lu <hjl.to...@gmail.com> wrote:
>
>>> Pmode is still in DImode and DImode addresses are *valid* addresses.
>>> For the testcase from PR,
>>> expand generates SImode symbol that is later extended to DImode and
>>> handled through movabs.
>>>
>>> Your patch just papers over this fact. Please see how
>>> *movdi_internal_rex64 handles immediates.
>>>
>>
>> For the testcase in:
>>
>> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49860
>>
>> my goal is to make TARGET_X32 to generate code very similar to
>> TARGET_32BIT, except for r8-r15. How can we achieve that?
>
> Unless you can prevent DImode symbols in ix86_legitimate_constant_p, we can't.
_Perhaps_ we can reject large offsets for X32 from
ix86_legitimate_constant_p here:
if (GET_CODE (x) == PLUS)
{
if (!CONST_INT_P (XEXP (x, 1)))
return false;
x = XEXP (x, 0);
}
(I didn't test this idea yet).
Uros.
