906a053208
* Remove register class from `SpillSlot` The register allocator was already allowing moves between spillslots and registers of different classes, so this PR formalizes this by making spillslots independent of register class. This also fixes #79 by properly tracking the register class of an `InsertedMove` with the `to_vreg` field which turns out to never be `None` in practice. Removing the `Option` allows the register class of the `VReg` to be used when building the per-class move lists. Fixes #79 * Address review feedback
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.