Regression: AOT crc32() compile fails — AddrSpaceCast module verify (re-#1014, ext/standard/crc32.c)

[PurHur]

Category

bug · php-src-strict · AOT · pillar 4

Problem

VM/JIT match Zend for crc32(), but AOT compile aborts during LLVM module verification (AddrSpaceCast source must be a pointer). Previously closed as working in #1014 — compile path regressed.

Repro	Zend / VM / JIT (2026-08-02, dd9bde493)	AOT compile
crc32('php-compiler')	4282364586	FAIL — RuntimeException: Module verification failed due to AddrSpaceCast source must be a pointer (PHPLLVM\LLVMAbstract\Module::verify)

php-src reference

• php/php-src ext/standard/crc32.c — PHP_FUNCTION(crc32)
• php/php-src ext/standard/basic_functions.stub.php — crc32

PHP implementation target

• ext/standard/ crc32 helper / NestedJIT string→int lowering (share VM path; fix pointer cast in LLVM emission)
• Prefer PHP-in-PHP; no new runtime/*.c logic

Repro

./script/docker-exec.sh -- bash -lc '
cat > /tmp/aot_crc32.php <<'"'"'PHP'"'"'
<?php
echo crc32("php-compiler"), PHP_EOL;
PHP
echo -n "zend="; php /tmp/aot_crc32.php
echo -n "vm="; php bin/vm.php /tmp/aot_crc32.php 2>/dev/null
echo -n "jit="; php bin/jit.php /tmp/aot_crc32.php 2>/dev/null
php bin/compile.php -o /tmp/aot_crc32 /tmp/aot_crc32.php
'

Done when

• php bin/compile.php succeeds for the repro
• AOT binary prints 4282364586 matching Zend/VM/JIT
• Prefer --repeat 10 on the built binary
• test/repro/ or compliance guard
• php-src-strict; no php-compiler-strict shortcut
• No restamp / fake green — exercise the built binary

[PurHur]

claim: PHP Compiler STD Lib — starting this run

Mandatory pre-triage (this workspace): docker info OK; vendor present. Running bootstrap-inventory / release-readiness / AOT repro next; will paste gate snapshot on progress.

[PurHur]

Merged via #27966

Gate snapshot (this run)

• bootstrap-inventory --check: OK 7078/7078
• release-readiness --json: north-star5-fast red on master (gen-0 mismatch Self-host M5: bootstrap-inventory argv driver size floor — grow beyond 451KB stub #8713); vm-driver-probe / gen0-functional OK
• Issue symptom on master: AOT compiled but printed 0 (AddrSpaceCast from the issue title no longer reproduced; silent wrong-0 via VmCrc32 NestedJIT stub)

Fix

NestedJIT-safe Crc32JitHelper (bit-by-bit CRC32B/C + Bin2hex byteOrd); refreshed helper-runtime unit.

Verification

• AOT crc32('php-compiler') → 4282364586 (×10), helper cache on/off
• Crc32BuiltinTest / Crc32RuntimeShrinkTest / AOT fixture crc32 OK
• bootstrap-selfhost-vm-driver-execute-probe OK