CharlesKWON 15aa6dd4b3 perf(vm): in-place stack ops + ArrayGen/EvalBlock shift — global 2-6% ...

Three small tweaks to the pop-push hotspots in the VM.

 - ops_arith.go Inc/Dec/AddInt: unary ops mutate the top stack slot in
   place via peekPtr() instead of pop-compute-push. Drops the bounds
   check + cachedNil clear + push bounds check per call. Biggest
   beneficiary: FOR loop counters (implicit Inc) — every iteration of
   every PRG loop pays these ops once.

 - ops_collection.go ArrayGen: consume N slots via a single `copy`
   into the freshly-allocated result slice, then rewind sp and clear
   the intermediate slots for GC (the first slot is overwritten by
   the array push). Skips the N-deep pop loop.

 - ops_collection.go EvalBlock: read block value before shift, collapse
   args down one slot to overwrite the block position, then let the
   block run against the same in-place layout. Matches the
   Function()/PushSymbol round-trip removal from the prior commit.

bench_sql deltas

 - B2  WHERE            83 →  78 µs  (6%)
 - B3  ORDER BY         96 →  90 µs  (6%)
 - B4  GROUP_HAVING    554 → 528 µs  (5%)
 - B9  ROW_NUMBER      255 → 241 µs  (5%)
 - B10 RANK PART       296 → 278 µs  (6%)
 - B11 SUM OVER        320 → 300 µs  (6%)
 - B15 CTE+WIN+JOIN   1826 →1743 µs  (5%)

Verification
 - go test ./...              ALL PASS
 - FiveSql2 test_sql1999      43/43
 - tests/compat_harbour       56/56

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-04-17 20:48:15 +09:00

3.9 KiB

Raw Blame History

View Raw