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wasm: compact sparse mir_locals and RLE-encode local declarations in Emit.zig - #141
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November 4, 2026 17:41
Add Mir.Optimize.compactLocals to eliminate unused interior local slots, group live non-parameter locals by canonical std.wasm.Valtype (.i32, .i64, .f32, .f64, .v128) while preserving relative order, and remap prologue locals and .local_get/.local_set/.local_tee operands. Update Emit.lower to run-length encode consecutive identical Valtype runs in each function's Code section header via encodeLocals, reducing local declaration entries to at most 5 runs per function. Closes #111 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Summary
Mir.Optimize.compactLocalsinsrc/codegen/wasm/Optimize.zig(invoked at the end ofCodeGen.generateInnerafter deadsp_localepilogue stripping) to eliminate unused interiormir_localsslots, group live non-parameter locals by canonicalstd.wasm.Valtype(.i32,.i64,.f32,.f64,.v128) while preserving relative order within each type, and remap activebottom_stack_local/sp_localand.local_get/.local_set/.local_teeinstruction operands.Emit.lowerinsrc/codegen/wasm/Emit.zigto run-length encode consecutive identicalstd.wasm.Valtypeentries viaencodeLocals, emitting at most 5(count, valtype)runs per function instead ofN(1, valtype)entries.src/codegen/wasm/Optimize.zigand end-to-endwasm32-wasibehavior tests intest/behavior/wasm.zig.Closes #111