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Adds `licm` as the final post-lowering optimizer pass. Detects natural loops via back-edges and dominator-tree analysis, then hoists side-effect-free loop-invariant instructions into loop preheader blocks. Runs after GVN and branch_fold so redundancies are resolved before hoisting decisions are made. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
licmas the final post-lowering optimizer passbranch_fold— so loop exit conditions are already simplified and redundancies removed before hoisting decisions are madePipeline position
Test plan
cargo test -p herkos-core --lib— 232 tests pass (18 new licm tests)cargo clippy— cleancargo fmt --checkStack
This is PR F4 of 4 (last) in the optimizer split. Stacked on PR F3 (
pr-f3/gvn→ #37).branch_foldlocal_csegvnlicm🤖 Generated with Claude Code