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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
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.