[PATCH] D1623: Support __builtin_ms_va_list.

Charles Davis cdavis5x at gmail.com
Mon Jul 27 12:17:11 PDT 2015

cdavis5x added a comment.

In http://reviews.llvm.org/D1623#212706, @rnk wrote:

> We can easily codegen `__builtin_ms_va_start()` and `end()` to `llvm.vastart` / `llvm.vaend`, because the first *has* to live in the win64 function and the second is a no-op. We should remove the FIXME about lowering `__builtin_ms_va_arg()` in LLVM instead of clang, because you can use it from a SysV function and it should work: consider implementing Win64 printf by calling an internal SysV vfprintf implementation. We also need to implement `__builtin_ms_va_copy()` in Clang for the same reason, but that's easy, since it's always a simple pointer load and store.
> Charles, are you actively working on this or should I just fix up the patch and submit it?

Stand by. I have a new version of this patch to upload that does all those things.


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