MergeBlocks: Migrate from invalidates to orderedBefore#8767
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Replace the coarse 'invalidates' check in 'MergeBlocks' with 'orderedBefore'. This allows 'MergeBlocks' to move expressions (like GC reads) out of blocks past other sibling expressions that have been left behind. Also clean up dead code in 'optimize()' by removing the unused 'dependency1' and 'dependency2' parameters and their checks (which were the other two replaced 'invalidates' calls that are no longer active). TAG=agy
aheejin
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May 24, 2026
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| ;; Test 1: Disallowed reordering (GC read NOT moved before Wasm acquire load) | ||
| ;; Child 0 is named, so it is NOT optimized and its effects (acquire load) are left behind. | ||
| ;; Child 1 tries to move the GC read out, which should be blocked because it cannot move before the acquire load. |
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NIt: Comment 80-col wrapping. The same for Test 2
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Replace the coarse 'invalidates' check in 'MergeBlocks' with 'orderedBefore'. This allows 'MergeBlocks' to move expressions (like GC reads) out of blocks past other sibling expressions that have been left behind.
Also clean up dead code in 'optimize()' by removing the unused 'dependency1' and 'dependency2' parameters and their checks (which were the other two replaced 'invalidates' calls that are no longer active).
TAG=agy