mirror of
https://github.com/ii64/sonic.git
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70 lines
1.6 KiB
Go
70 lines
1.6 KiB
Go
/*
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* Copyright 2021 ByteDance Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package caching
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import (
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`fmt`
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`testing`
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`unsafe`
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`github.com/bytedance/sonic/internal/rt`
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)
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const (
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_H_basis uint64 = 0xcbf29ce484222325
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_H_prime uint64 = 0x00000100000001b3
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)
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func fnv1a(s string) uint64 {
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v := _H_basis
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m := (*rt.GoString)(unsafe.Pointer(&s))
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/* hash each byte */
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for i := 0; i < m.Len; i++ {
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v ^= uint64(*(*uint8)(unsafe.Pointer(uintptr(m.Ptr) + uintptr(i))))
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v *= _H_prime
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}
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/* never returns 0 for hash */
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if v == 0 {
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return 1
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} else {
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return v
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}
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}
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func TestHashing_Fnv1a(t *testing.T) {
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fmt.Printf("%#x\n", fnv1a("hello, world"))
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}
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func TestHashing_StrHash(t *testing.T) {
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s := "hello, world"
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fmt.Printf("%#x\n", StrHash(s))
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}
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var fn_fnv1a = fnv1a
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func BenchmarkHashing_Fnv1a(b *testing.B) {
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for i := 0; i < b.N; i++ {
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fn_fnv1a("accountid_interval_aweme_second")
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}
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}
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func BenchmarkHashing_StrHash(b *testing.B) {
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for i := 0; i < b.N; i++ {
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StrHash("accountid_interval_aweme_second")
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}
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}
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