[LLVMdev] Does LLVM have some interface to determine whether a parameter type may be passed in registers?

[zhangxiongpang]

Hi, all!

I want to implement C language variable argument support with LLVM-3.3 on x86_64. 
But it seems LLVM does not support va_arg with long double type and aggregate type
on x86_64.  So I need to seek another way.

I saw the "Coding Examples" in AMD64-ABI manual, in which the algorithm for the 
generic va_arg implementation needs to determine whether a parameter type may be 
passed in registers. I want to know whether LLVM has already implemented some 
interfaces to check it? Or I need to write one by myself?  It's a pity that I'm not very 
familiar with it. Can anyone give me some suggestions? 

Thanks in advance!

Zhang
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