[LLVMdev] Plans considering first class structs and multiple return values
Devang Patel
dpatel at apple.com
Mon Jun 9 07:15:46 PDT 2008
On Jun 9, 2008, at 4:14 AM, Duncan Sands wrote:
> Hi,
>
>> Will sretpromotion still be needed? If the frontends would generate
>> functions
>> returning a struct directly instead of using an sret argument, sret
>> could
>> perhaps be removed alltogether? Though I guess there is an ABI
>> difference
>> between using sret and returning a structure directly?
>
> right, there's an ABI difference. Also you can't return variable
> sized structs
> using MRV support (I don't know if gcc really supports this, but
> some pieces of
> code inside gcc mention functions returning variable sized objects).
Plus it is not a good idea to pass very large structs using MRV.
-
Devang
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