[LLVMdev] Question on sret

[John Criswell]

Eli Friedman wrote:
> On Wed, Jul 14, 2010 at 8:49 AM, John Criswell <criswell at uiuc.edu> wrote:
>   
>> Dear All,
>>
>> What is the purpose of the sret function parameter attribute?  Does it
>> affect the calling convention used during code generation, is it a hint
>> to optimizations, or is it used for something else?
>>     
>
> Both of the above; see LangRef.
>   

I did read the LangRef; it told me what sret was but not why it exists 
or how the compiler utilizes it (or I somehow missed that part of the text).

>   
>> I'm currently working on automatic pool allocation; this transform
>> clones a function and adds extra parameters to the beginning of the
>> function's parameter list.  This means that I have to remove the sret
>> attribute from the original first parameter.  Is removing sret safe?
>>     
>
> Removing sret changes the calling convention, but otherwise it's safe.
>   

Okay, thanks.

-- John T.

> -Eli
>