[llvm-bugs] [Bug 29143] New: va_arg in ms_abi variadic functions should expect large structs to be passed by reference

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=29143

            Bug ID: 29143
           Summary: va_arg in ms_abi variadic functions should expect
                    large structs to be passed by reference
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rnk at google.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

As we discovered in http://llvm.org/pr20569, MSVC passes structs larger than 8
bytes indirectly by reference. We now emit the correct code on Win64, but we
don't do the right thing for functions marked ms_abi because they use
__builtin_va_arg instead of __builtin_ms_va_arg.

We should do something so that ms_abi functions on a sys V system act more like
native win64 functions.

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