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Matthias Krüger
5023691213
implement `va_arg` for x86_64 systemv tracking issue: https://github.com/rust-lang/rust/issues/44930 Turns out LLVM's `va_arg` is also unreliable for this target. https://github.com/llvm/llvm-project/issues/141361 So, like clang, we implement our own. I used - the spec at https://gitlab.com/x86-psABIs/x86-64-ABI - the clang implementation at https://github.com/llvm/llvm-project/blob/9a440f84773c56d3803f330774acb2b4f471d5b4/clang/lib/CodeGen/Targets/X86.cpp#L3041 We can take a bunch of shortcuts because the return type of `va_list` must implement `VaArgSafe`. I also extended some of the tests, because up to 11 floats can be stored in the `reg_safe_area` for this calling convention. r? `@workingjubilee` `@rustbot` label +F-c_variadic try-job: x86_64-apple-1