kthomsen added a comment. The desired function for this va_arg is not in lib/Target/PowerPC/*.cpp, it is in tools/clang/lib/CodeGen/TargetInfo.cpp , a little bit unexpected to me. PPC32_SVR4_ABIInfo::EmitVAArg() is doing the va_arg handling. For testing, I have added a hasSPE = true and treat the parameter like SoftFloat. It looks good! Now I need to find out, where to get "hasSPE" from.
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