CodePushing: Migrate from invalidates to orderedBefore#8745
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Replace the coarse `invalidates` check and the coarse global state check in LICM with more precise `orderedBefore` checks. This allows LICM to move memory accesses past release stores, while still correctly blocking them from moving past acquire loads. Add a lit test to verify the asymmetrical reordering behavior with release/acquire atomics on shared memory/GC structs.
Replace the coarse `invalidates` check in `LocalCSE` with `orderedBefore`. This allows `LocalCSE` to reuse expression values across release stores, while still correctly blocking reuse across acquire loads. Add a lit test to verify the asymmetrical reordering behavior with release/acquire atomics on shared GC structs and Wasm memory.
Replace the coarse `invalidates` check in `CodePushing` with `orderedBefore`. This allows `CodePushing` to push expressions (like GC reads) past acquire loads, while still correctly blocking them from being pushed past release stores. Add a lit test to verify the asymmetrical reordering behavior with release/acquire atomics on shared GC structs and Wasm memory.
kripken
approved these changes
May 21, 2026
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Replace the coarse
invalidatescheck inCodePushingwithorderedBefore.This allows
CodePushingto push expressions (like GC reads) past acquireloads, while still correctly blocking them from being pushed past release
stores.
Add a lit test to verify the asymmetrical reordering behavior with
release/acquire atomics on shared GC structs and Wasm memory.