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crc32c: choose function in static initialization

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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)
This commit is contained in:
Albert Strasheim 2014-02-02 12:52:52 -08:00
parent 2966d764cd
commit d411dc5884
1 changed files with 2 additions and 5 deletions
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7
util/crc32c.cc
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@ -333,17 +333,14 @@ static bool isSSE42() {
} }
typedef void (*Function)(uint64_t*, uint8_t const**); typedef void (*Function)(uint64_t*, uint8_t const**);
static Function func = nullptr;
static inline Function Choose_CRC32() { static inline Function Choose_CRC32() {
return isSSE42() ? Fast_CRC32 : Slow_CRC32; return isSSE42() ? Fast_CRC32 : Slow_CRC32;
} }
static Function func = Choose_CRC32();
static inline void CRC32(uint64_t* l, uint8_t const **p) { static inline void CRC32(uint64_t* l, uint8_t const **p) {
if (func != nullptr) {
return func(l, p);
}
func = Choose_CRC32();
func(l, p); func(l, p);
} }