4f1161d9e4
* Generalize debug-info support a bit. Previously, debug value-label support required each vreg to have a disjoint sequence of instruction ranges, each with one label. Unfortunately, it's entirely possible for multiple values at the program level to map to one vreg at the IR level, leading to multiple labels. This PR generalizes the debug-info generation support to allow for arbitrary (label, range, vreg) tuples, as long as they are sorted by vreg, with no other requirements. The lookup is a little more costly when we generate the debuginfo, but in practice we shouldn't have more than a *few* debug value labels per vreg, so in practice the constants should be small. * Typo fix from Amanieu Co-authored-by: Amanieu d'Antras <amanieu@gmail.com> Co-authored-by: Amanieu d'Antras <amanieu@gmail.com>
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.