[LLVMdev] promotion of return value.

Andrew Haley
Thu, 12 Mar 2009 18:31:54 -0000

Rafael Espindola wrote:
>>> 1) The return value promotion will be removed from llvm backend and
>>>   implemented in both front-ends (clang and llvm-gcc)
>>>
>>> 2) The promotions are only applied to the return value in the body
>>>   of the function.
>>>   Return value of function definition and declaration will not be
>>> promoted
>
> You might want to look at bug http://llvm.org/bugs/show_bug.cgi?id=3779.
>
> If I understand what you are proposing, it is exactly the opposite of
> what gcc does, which would be annoying for someone trying to link gcc
> and llvm compiled code.

That's right.  In gcc we used to do this in the front-ends but we
stopped.  This required quite a lot of discussion with the Linux ABI
standardization people.

Andrew.