[LLVMdev] Two new 'llvmnotes'

[Gordon Henriksen]

On 2008-04-27, at 15:56, Chris Lattner wrote:

> On Apr 27, 2008, at 12:49 PM, Nick Lewycky wrote:
>
>> Chris Lattner wrote:
>>
>>> On Apr 27, 2008, at 10:58 AM, Talin wrote:
>>>
>>>> I would certainly make use of this in my frontend.
>>>>
>>>> I suggest the names "getfield" and "setfield" for the two  
>>>> operations,
>>>
>>> I agree that 'get/insertvalue' are pretty generic, and am welcome  
>>> to suggestions.  Get/set *field* imply that this applies only to  
>>> structs, but it also works with arrays.  I would actually prefer  
>>> get/insert *element* but insertelement is already taken.
>>
>> What's wrong with using insert/extractelement for arrays and  
>> structs as well as vectors? They're all sequence types.
>
> Vector insert/extract element take (potentially variable) Value*'s  
> for the index and only allows one index.  Aggregate get/set take  
> constants and are variadic.


Forbidding variable indices for arrays would seem to rather reduce  
their utility (precisely to that of a homogenous struct). Granted,  
lowering makes updating an indexed value much uglier, but it would  
seem to be an already-solved problem for vector lowering. Is it  
completely impractical to use the same rule as GEP?

— Gordon