perf(compiler): share full dynamic dispatch in stack SSA - #586
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Reuse the module-level full-table dispatch for unfiltered dynamic jumps when stack-SSA lifting is enabled. Keep proven filtered target sets source-specific and add a structural regression for dispatch growth.
ZR74
marked this pull request as ready for review
July 29, 2026 03:30
⚡ Performance Regression Check Results✅ Performance Check Passed (interpreter)Performance Benchmark Results (threshold: 25%)
Summary: 194 benchmarks, 0 regressions ✅ Performance Check Passed (multipass)Performance Benchmark Results (threshold: 25%)
Summary: 193 benchmarks, 0 regressions |
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What changed
analysis cannot narrow the target set.
candidate-target set.
FullDynamicDispatchIsSharedAcrossSourcesto prevent full dispatchduplication from returning.
Why
Before this change, stack-SSA mode deliberately bypassed the existing
shared-dispatch path. Every unfiltered dynamic
JUMPorJUMPIsourcetherefore emitted another full switch over all
JUMPDESTtargets. WithSdynamic sources and
Ttargets, the duplicated switch structure grewapproximately with
S × T, inflating MIR/CgIR, compile work, and generatedcode.
Effect
Unfiltered sources now branch to one module-level full dispatch. The full-table
portion therefore grows approximately with
T + Sinstead ofS × T, whilestatically narrowed sources retain their smaller per-source dispatch tables.
This is a compiler-structure optimization only:
JUMPDESTblocks.Validation
evmJitFrontendTests: 109/109 passed.clang-format --dry-run --Werrorpassed.git diff --checkpassed.