[llvm-commits] [PATCH] Proper va_arg/va_copy lowering on WindowsX86_64

[Nico Rieck]

X86ISelLowering lowers va_arg and va_copy assuming
X86_64ABIBuiltinVaList as va_list kind for 64-bit targets. This
generates broken code because WindowsX86_64 uses char* for va_list.

There seems to be no way to easily access the TargetInfo and its
va_list-kind so the patch adds an additional check for Windows
(including CygMin).

---
 lib/Target/X86/X86ISelLowering.cpp |  4 ++-
 test/CodeGen/X86/win64_vararg.ll   | 59
++++++++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+), 1 deletion(-)


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