47cb8234b6
* Remove unused regalloc2-test crate This code doesn't build, and Chris says it's "a really old harness that existed prior to building the fuzzing and was used mainly to profile and get stats before integration with Cranelift". * Re-export libfuzzer/arbitrary from fuzzing module This avoids needing to keep dependencies on `arbitrary` in sync across the three different Cargo.toml files in this project. However, before version 0.4.2, libfuzzer-sys only supported using its macros if it was available at the top-level `libfuzzer_sys` path, which breaks when re-exporting it. So I'm upgrading to that version (or the newest patch release of it). Upgrading libfuzzer-sys in turn brings in the 1.0 release of the arbitrary crate, with a minor API change along the way.
regalloc2: another register allocator
This is a register allocator that started life as, and is about 50% still, a port of IonMonkey's backtracking register allocator to Rust. In many regards, it has been generalized, optimized, and improved since the initial port, and now supports both SSA and non-SSA use-cases.
In addition, it contains substantial amounts of testing infrastructure (fuzzing harnesses and checkers) that does not exist in the original IonMonkey allocator.
See the design overview for (much!) more detail on how the allocator works.
License
This crate is licensed under the Apache 2.0 License with LLVM
Exception. This license text can be found in the file LICENSE.
Parts of the code are derived from regalloc.rs: in particular,
src/checker.rs and src/domtree.rs. This crate has the same license
as regalloc.rs, so the license on these files does not differ.