29b23d41b6
* cranelift-codegen: Use ISLE matching, not same_value The `same_value` function just wrapped an equality test into an external constructor, but we can do that with ISLE's equality constraints instead. * riscv64: Remove custom condition-code tests The `lower_icmp` term exists solely to decide whether to sign-extend or zero-extend the comparison operands, based on whether the condition code requires a signed comparison. It additionally tested whether the condition code was == or !=, but produced the same result as for other unsigned comparisons. We already have `signed_cond_code` in the ISLE prelude, which classifies the total-ordering condition codes according to whether they're signed. It also lumps == and != in the "unsigned" camp, as desired. So this commit uses the existing method from the prelude instead of riscv64-local definitions. Because this version has no constraints on the left-hand side of the rule in the unsigned case, ISLE generates Rust that always returns `Some`. That shows that the current use of `unwrap` is justified, at the only Rust-side call-site of `constructor_lower_icmp`, which is in cranelift/codegen/src/isa/riscv64/lower/isle.rs. * ISLE prelude: make offset32 infallible This extractor always returns `Some`, so it doesn't need to be fallible.
This crate contains the core Cranelift code generator. It translates code from an intermediate representation into executable machine code.