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bors c97922dca5 Auto merge of #99443 - jam1garner:mips-virt-feature, r=nagisa 
Add support for MIPS VZ ISA extension

[Link to relevant LLVM line where virt extension is specified](83fab8cee9/llvm/lib/Target/Mips/Mips.td (L172-L173))

This has been tested on mips-unknown-linux-musl with a target-cpu that is >= MIPS32 5 and `target-features=+virt`. The example was checked in a disassembler to ensure the correct assembly sequence was being generated using the virtualization instructions.

Needed additional work:

* MIPS is missing from [the Rust reference CPU feature lists](https://doc.rust-lang.org/reference/attributes/codegen.html#available-features)

Example docs for later:

```md
#### `mips` or `mips64`

This platform requires that `#[target_feature]` is only applied to [`unsafe`
functions][unsafe function]. This target's feature support is currently unstable
and must be enabled by `#![feature(mips_target_feature)]` ([Issue #44839])

[Issue #44839]: https://github.com/rust-lang/rust/issues/44839

Further documentation on these features can be found in the [MIPS Instruction Set
Reference Manual], or elsewhere on [mips.com].

[MIPS Instruction Set Reference Manual]: https://s3-eu-west-1.amazonaws.com/downloads-mips/documents/MD00086-2B-MIPS32BIS-AFP-6.06.pdf
[developer.arm.com]: https://www.mips.com/products/architectures/ase/

Feature        | Implicitly Enables | Description
---------------|--------------------|-------------------
`fp64`         |                    | 64-bit Floating Point
`msa`          |                    | "MIPS SIMD Architecture"
`virt`         |                    | Virtualization instructions (VZ ASE)
```

If the above is good I can also submit a PR for that if there's interest in documenting it while it's still unstable. Otherwise that can be dropped, I just wrote it before realizing it was possibly not a good idea.

Relevant to #44839
2022-09-14 08:21:25 +00:00
..
src Auto merge of #99443 - jam1garner:mips-virt-feature, r=nagisa 2022-09-14 08:21:25 +00:00
Cargo.toml
README.md

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.