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dependabot[bot] f13cd3e6ef Bump cranelift from `4bc56b8` to `8456797` Bumps [cranelift](https://github.com/CraneStation/cranelift) from `4bc56b8` to `8456797`. - [Release notes](https://github.com/CraneStation/cranelift/releases) - [Commits](`4bc56b8505...84567979ba`) Signed-off-by: dependabot[bot] <support@dependabot.com>		2019-04-10 04:17:48 +00:00
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clean_all.sh	Stop using xargo for building the sysroot	2018-12-15 16:18:03 +01:00
config.sh	Misc changes	2019-03-11 20:45:59 +01:00
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test.sh	Rename load_value_pair to load_scalar_pair and fix dynamic dispatch with arbitrary self types	2019-03-03 12:19:55 +01:00

Readme.md

Work in progress cranelift codegen backend for rust

⚠⚠⚠ This doesn't do much useful yet ⚠⚠⚠

Building

$ git clone https://github.com/bjorn3/rustc_codegen_cranelift.git
$ cd rustc_codegen_cranelift
$ ./prepare.sh # downloads and patches sysroot src and installs hyperfine for benchmarking
$ ./test.sh

Usage

$cg_clif_dir is the directory you cloned this repo into in the following instruction.

Rustc

$ rustc -Cpanic=abort -Zcodegen-backend=$cg_clif_dir/target/debug/librustc_codegen_cranelift.so my_crate.rs

Cargo

$ RUSTFLAGS="-Cpanic=abort -Zcodegen-backend=$cg_clif_dir/target/debug/librustc_codegen_cranelift.dylib --sysroot $cg_clif_dir/build_sysroot/sysroot" cargo run

Not yet supported

Good non-rust abi support (scalar pair and vector are passed by-ref)
Checked binops (some missing instructions in cranelift)
Inline assembly (no cranelift support)
u128 and i128 (no cranelift support)
SIMD (tracked here)

Troubleshooting

Can't compile

Try updating your nightly compiler. You can try to use an nightly a day or two older if updating rustc doesn't fix it. If you still can't compile it, please fill an issue.