Public bug reported: Zend/zend_alloc.c uses __builtin_clzl in zend_mm_high_bit and zend_mm_low_but, but only if (defined(__arm__) || defined(__aarch64__)). This is overly restrictive: it's also usable if __defined__(__powerpc__).
This causes a bump to speed on POWER systems: previously zend_mm_high_bit shows up on perf reports, with this patch the functions drop out of the profile entirely. This bug has also been reported upstream (https://bugs.php.net/bug.php?id=69703), but I've sent you this report, along with a `dpkg-source --commit` style patch, in the hopes that you'll pick it up, so that Ubuntu users get the performance improvement sooner. This patch was built and tested on Vivid, but is applicable to a range of PHP versions. ** Affects: php5 (Ubuntu) Importance: Undecided Status: New ** Attachment added: "__builtin_clzl.patch" https://bugs.launchpad.net/bugs/1458434/+attachment/4403858/+files/__builtin_clzl.patch -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to php5 in Ubuntu. https://bugs.launchpad.net/bugs/1458434 Title: Use __builtin_clzl on POWER To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/php5/+bug/1458434/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
