llvm dev - Dec 2008 - [LLVMdev] LegalizeIntegerType and truncating stores

Hi,

In PromoteIntOp_STORE, why can we not promote a value and generate a  
truncating store if the incoming store is a truncating store?   
Naively, I can't see why we can promote the incoming value to a legal  
type and then generate a truncating store.  For example, one has  
incoming code  that produces an i16 via some operation and does a  
truncating store the result of that value in i8.  If that operation  
only has a 32 bit variant, it seems reasonable to promote the i16 to  
i32 and replace the truncating store from i16 to i8 with one from i32  
to i8.

Thanks,
   -- Mon Ping

Hi Mon Ping,
> In PromoteIntOp_STORE, why can we not promote a value and generate a
> truncating store if the incoming store is a truncating store?
as far as I can see you can just remove the assertion.

Ciao,

Duncan.

Hi Duncan,

Thanks!  I'll do so.

   -- Mon Ping

On Dec 13, 2008, at 8:19 AM, Duncan Sands wrote:
> Hi Mon Ping,
>
>> In PromoteIntOp_STORE, why can we not promote a value and generate a
>> truncating store if the incoming store is a truncating store?
>
> as far as I can see you can just remove the assertion.
>
> Ciao,
>
> Duncan.
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