llvm dev - Nov 2009 - [LLVMdev] Support for Aggregate Return Values

Dear All,

How well does the LLVM code generators support returns of structure 
types in LLVM 2.6?  I'm currently writing a transform that requires 
functions to return multiple values and am thinking implementing it by 
changing the function to return a struct.

If it matters, I'm currently targeting 32-bit Linux and Mac OS X for x86.

-- John T.

On Nov 10, 2009, at 8:26 PM, John Criswell wrote:
> Dear All,
>
> How well does the LLVM code generators support returns of structure
> types in LLVM 2.6?  I'm currently writing a transform that requires
> functions to return multiple values and am thinking implementing it by
> changing the function to return a struct.
>
> If it matters, I'm currently targeting 32-bit Linux and Mac OS X for  
> x86.
returning aggregates with up to two elements will work reliably.

-Chris

On Tue, Nov 10, 2009 at 11:22 PM, Chris Lattner <clattner at apple.com>
wrote:
>
> On Nov 10, 2009, at 8:26 PM, John Criswell wrote:
>
>> Dear All,
>>
>> How well does the LLVM code generators support returns of structure
>> types in LLVM 2.6?  I'm currently writing a transform that requires
>> functions to return multiple values and am thinking implementing it by
>> changing the function to return a struct.
>>
>> If it matters, I'm currently targeting 32-bit Linux and Mac OS X
for
>> x86.
>
> returning aggregates with up to two elements will work reliably.
>
> -Chris
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An update to support arbitrary-sized struct returns is awaiting final approval.