[libcxx-commits] [PATCH] D68972: [libunwind][Android] Fix findUnwindSections for ARM EHABI Bionic

[Ryan Prichard via Phabricator via libcxx-commits]

rprichard added reviewers: thomasanderson, srhines, danalbert, ed, keith.walker.arm.
rprichard added a comment.
Herald added a reviewer: mclow.lists.

FWIW, I tested the "extest" benchmark from https://github.com/android/ndk/issues/1062 on arm32. Using dl_unwind_find_exidx, the benchmark throws 10,000 exceptions in about 860ms. Using dl_iterate_phdr, the run-time varies, and I saw run-times from 3000-6000ms. (The unwinder has an optimization where it compares dlpi_addr to the target PC, and that makes EH overhead depend on the layout of shared libraries in memory.)


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