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rust/compiler/rustc_codegen_llvm
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Matthias Krüger 5023691213
Rollup merge of #141538 - folkertdev:systemv-x86_64-va_arg, r=workingjubilee 
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 9a440f8477/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
2025-05-30 07:01:30 +02:00
..
src Rollup merge of #141538 - folkertdev:systemv-x86_64-va_arg, r=workingjubilee 2025-05-30 07:01:30 +02:00
Cargo.toml don't depend on rustc_attr_parsing if rustc_data_structures will do 2025-05-09 23:16:55 +02:00
messages.ftl KCFI: Add KCFI arity indicator support 2025-04-05 04:05:04 +00:00
README.md mv compiler to compiler/ 2020-08-30 18:45:07 +03:00

README.md

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.