8c55b81300
* Optimizations to egraph framework: - Save elaborated results by canonical value, not latest value (union value). Previously we were artificially skipping and re-elaborating some values we already had because we were not finding them in the map. - Make some changes to handling of icmp results: when icmp became I8-typed (when bools went away), many uses became `(uextend $I32 (icmp $I8 ...))`, and so patterns in lowering backends were no longer matching. This PR includes an x64-specific change to match `(brz (uextend (icmp ...)))` and similarly for `brnz`, but it also takes advantage of the ability to write rules easily in the egraph mid-end to rewrite selects with icmp inputs appropriately. - Extend constprop to understand selects in the egraph mid-end. With these changes, bz2.wasm sees a ~1% speedup, and spidermonkey.wasm with a fib.js input sees a 16.8% speedup: ``` $ time taskset 1 target/release/wasmtime run --allow-precompiled --dir=. ./spidermonkey.base.cwasm ./fib.js 1346269 taskset 1 target/release/wasmtime run --allow-precompiled --dir=. ./fib.js 2.14s user 0.01s system 99% cpu 2.148 total $ time taskset 1 target/release/wasmtime run --allow-precompiled --dir=. ./spidermonkey.egraphs.cwasm ./fib.js 1346269 taskset 1 target/release/wasmtime run --allow-precompiled --dir=. ./fib.js 1.78s user 0.01s system 99% cpu 1.788 total ``` * Review feedback.
This crate contains the core Cranelift code generator. It translates code from an intermediate representation into executable machine code.