fc5200aa9b
Modern Clang and GCC can successfully implement simple conditions without branching with math and flag operations. Use of arrays for translation no longer helps as much as it was 14+ years ago. Disassemble of the code generated by Clang 13.0.0 on FreeBSD 13.1, Clang 14.0.4 on FreeBSD 14 and GCC 10.2.1 on Debian 11 with this change still shows no branching instructions. Profiling of CPU-bound scan stage of sorted scrub shows reproducible reduction of time spent inside avl_find() from 6.52% to 4.58%. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored-By: iXsystems, Inc. Closes #13540 |
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