[LLVMdev] Modeling 16-bit pointer registers for an 8-bit target

[Evan Cheng]

On Aug 7, 2008, at 9:45 AM, Sanjiv.Gupta at microchip.com wrote:

>>
>> I don't think there is code in Legalizer to expand GlobalAddress. But
> you
>> can custom lower it. X86 custom lower GlobalAddress nodes for a
> different
>> reason.
>>
>> Evan
>>
>
> Hmmm...That means we have to make i16 as a legal type (since
> GlobalAddresses are 16-bits) and custom lower all 16-bit operations to
> 8-bit operations. I was thinking to take advantage of the already
> present ExpandOp infrastructure.

You can, in a lot of cases. But not for GV's currently since the code  
isn't there. Most targets custom lower GV's currently.

Evan

>
>
> -Sanjiv
>
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