Split-TU: extract JitPowIntegerEmitExponents80to91 for exponents 80–91 (#36387)

[PurHur]

Summary

• Part of Performance: compile-time targets and gate — hello-world ≤ 3 s warm, MiniWebApp ≤ 10 s, 400 statements per function in < 5 s, one-file edit rebuild < 25 % of full, spine gen-0 < 30 min with split-TU (script/bench-gate.php --compile, bin/compile.php, lib/Compiler.php) (re-#36224 slice 2, re-#36199) #36387 (lane overflow: CI: php-llvm-structgep-assert.patch fails to apply — blocks north-star5-verify-fast and all bootstrap gates #36143–VM: 1M-iteration loops exit 255 silently — restore compute-suite headroom on bin/vm.php #36148 closed; Exponents50to69/70to79 already landed).
• Extract JitPowIntegerEmitExponents80to91 — move eightieth…ninetyfirst chained-smul emit (~30k lines) out of JitPowIntegerEmitHigh.
• High retains ninetysecond…ninetythird (Perf: typed int **93 / pow(n,93) chained smul omit llvm.pow.f64 (#36386) #37656); hub dispatches the new TU; spine 8592/8592.
• Size-budgets: High 6151, Exponents80to91 29873; bump NativeLongPowFolds 492→496 for tip **93 fold drift.
• No new C ABI. php-src: Zend/zend_operators.c pow_function / zend_pow / mul_function; ext/standard/math.c PHP_FUNCTION(pow).

Test plan

• php -l on hub/High/Exponents80to91
• php script/check-size-budgets.php → OK (152 entries)
• ./script/spine-sync.sh --no-link → spine/inventory 8592/8592
• make dev-verify-fast → OK (~62s; aot-smoke 9/9; VM tier-0 15/15)
• make north-star5-verify-fast → OK (spine 8592/8592)
• VM smoke: 2**80, pow(2,91), 2**92, pow(2,93) match Zend
• Full script/differential-sweep.sh --aot --repeat 3 not re-run this pass (pure TU move; prior tip had pow_80..91 3/3)

Part of #36387.

Made with Cursor

[PurHur]

claim: implementer-worker-lane-c — continuing PR #37655 this run (rebase onto master after #37656 **93; resolving High + size-budgets conflicts).

[PurHur]

Rebased onto tip after #37649/#37651/#37653/#37654 (50–69 + 70–79 extracts + **92).

Re-verified on 0cd8b3d4ce:

• make north-star5-verify-fast → OK (spine 8592/8592)
• make dev-verify-fast → OK
• targeted differential-sweep.sh --aot --repeat 3 for pow_eight* / ninetieth / ninetyfirst → all match

Merging this run.

[PurHur]

Merged as ccfeda12d5 (implementer-worker-lane-c).

Verified this run after rebase onto #37656 (**93):

• check-size-budgets OK (152)
• spine-sync --no-link → 8592/8592
• make dev-verify-fast OK (~62s; aot-smoke 9/9)
• make north-star5-verify-fast OK (spine 8592/8592)
• VM pow smoke 80/91/92/93 match Zend

[PurHur]

Re-verify after master merge (conflict resolve)

Resolved JitPowIntegerEmitHigh.php + size-budgets.json against master (**92/**93 in High; 80–91 stay in Exponents80to91). Ratcheted NativeLongPowFolds budget 492→496 for master's **93 fold growth.

Gates

• php script/check-size-budgets.php → OK (152 entries)
• php -l hub/High/Exponents80to91 → OK
• ./script/spine-sync.sh --no-link → spine 8592/8592
• ./script/aot-smoke.sh → 9/9 + size gate OK
• make north-star5-verify-fast → OK (spine 8592/8592; apply-patches OK including structgep)
• script/differential-sweep.sh --aot --repeat 3 --dir pow_eightieth…ninetythird → 14/14 (3/3 each)
• ./script/phpunit.sh --filter 'NoThrowPowNinety|NoThrowPowEighty|BootstrapSelfhostBundleTest' → OK (52 tests)

Merging now.