Bug #80742 [NEW]: Opcache JIT makes some boolean logic unexpectedly be true

From: dktapps at pmmp dot io Operating system: Windows 10 PHP version: 8.0Git-2021-02-13 (Git) Package: JIT Bug Type: Bug Bug description:Opcache JIT makes some boolean logic unexpectedly be true Description: ------------ JIT breaks some boolean logic involving and in ways I don't understand. It's possible this occurs with other operators, but I stumbled on this in code in the wild so I haven't tested further. When running the following using -dopcache.jit=0 (or without opcache), the script produces the expected result. Using -dopcache.jit=1205 produces the broken result. This occurs in a minimal NTS build with only PHP and OPcache using https://github.com/php/php-src/commit/6ec25f386ff058b5ecda6f11c5f62e934b31f660, so it's easily reproducible. Test script: --------------- <?php function checkGroundState(float $movY, float $dy) : void{ var_dump($movY != $dy, $movY < 0, ($movY != $dy and $movY < 0)); var_dump("wow!"); } checkGroundState(0, 0); Expected result: ---------------- bool(false) bool(false) bool(false) string(4) "wow!" Actual result: -------------- bool(false) bool(false) bool(true) string(4) "wow!" -- Edit bug report at https://bugs.php.net/bug.php?id=80742&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=80742&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=80742&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=80742&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=80742&r=needscript Try newer version: https://bugs.php.net/fix.php?id=80742&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=80742&r=support Expected behavior: https://bugs.php.net/fix.php?id=80742&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=80742&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=80742&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=80742&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=80742&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=80742&r=dst IIS Stability: https://bugs.php.net/fix.php?id=80742&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=80742&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=80742&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=80742&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=80742&r=mysqlcfg