Split-TU: extract JitPowIntegerEmitExponents100to103 for exponents 100–103 (#36386)

[PurHur]

Summary

• Part of Performance: v2.0 targets and the codegen roadmap to reach them — typed code ≥ 3x Zend, untyped ≤ 1.5x slower, web request ≥ php-fpm: inline caches for property/method access, escape analysis for arrays/strings, guarded speculation, per-function O1 by default (lib/JIT.php, lib/JIT/Builtin/Type/Object_.php, lib/JIT/Analyzer.php) #36386 (typed fast paths / split-TU). 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 / RunForge north star (Sep 2026): trust, build speed, performance — automation tracker #36142 children closed; #36386 % 3 == 2 is lane C; peer landed **104/**105 while this run extracted 100–103.
• Extract JitPowIntegerEmitExponents100to103 (hundredth…hundredthird) from JitPowIntegerEmitHigh so High stays under the size target after **104/**105 (High 21.9k→7.7k + 14.2k TU). Hub dispatches 100–103 before High. Spine 8596→8597.
• No new C ABI. php-src: Zend/zend_operators.c pow_function / zend_pow / mul_function; ext/standard/math.c PHP_FUNCTION(pow).

Part of #36386.

Test plan

• ./script/phpunit.sh --filter 'NoThrowPowHundred(th|first|second|third|fourth|fifth)MulAotTest|BootstrapSelfhostBundleTest' → 28/28 (679 assertions)
• ./script/aot-smoke.sh → 9/9; size gate OK
• php script/check-size-budgets.php → OK (157)
• php script/bootstrap-spine-count.php → 8597/8597; spine coverage + sidecar stamp OK
• ./script/check-generated-docs.sh → OK
• make north-star5-verify-fast → OK

Made with Cursor

[PurHur]

Superseded by #37701 (Split-TU extract Exponents100to104 already on master). Closing; pivoting to next #36386 slice (**106).