b4426be072
A branch is considered side-effecting and so updates the instruction color (which is our way of computing how far instructions can sink). However, in the lowering loop, we did not update current instruction color when scanning backward across branches, which are side-effecting. As a result, the color was stale and fewer load-op merges were permitted than are actually possible. Note that this would not have resulted in any correctness issues, as the stale color is too high (so no merges are permitted that should have been disallowed). Fixes #2562.
This crate contains the core Cranelift code generator. It translates code from an intermediate representation into executable machine code.