From d411dc58841c92d1100d9c0beb81a10818d6ae95 Mon Sep 17 00:00:00 2001 From: Albert Strasheim Date: Sun, 2 Feb 2014 12:52:52 -0800 Subject: [PATCH] crc32c: choose function in static initialization Before: 4.430 micros/op 225732 ops/sec; 881.8 MB/s (4K per op) After: 4.125 micros/op 242425 ops/sec; 947.0 MB/s (4K per op) --- util/crc32c.cc | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/util/crc32c.cc b/util/crc32c.cc index bca955a09..5008dddee 100644 --- a/util/crc32c.cc +++ b/util/crc32c.cc @@ -333,17 +333,14 @@ static bool isSSE42() { } typedef void (*Function)(uint64_t*, uint8_t const**); -static Function func = nullptr; static inline Function Choose_CRC32() { return isSSE42() ? Fast_CRC32 : Slow_CRC32; } +static Function func = Choose_CRC32(); + static inline void CRC32(uint64_t* l, uint8_t const **p) { - if (func != nullptr) { - return func(l, p); - } - func = Choose_CRC32(); func(l, p); } -- GitLab