hashing_test.go

Documentation: github.com/bytedance/sonic/internal/caching

     1  /*
     2   * Copyright 2021 ByteDance Inc.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package caching
    18  
    19  import (
    20      `fmt`
    21      `testing`
    22      `unsafe`
    23  
    24      `github.com/bytedance/sonic/internal/rt`
    25  )
    26  
    27  const (
    28      _H_basis uint64 = 0xcbf29ce484222325
    29      _H_prime uint64 = 0x00000100000001b3
    30  )
    31  
    32  func fnv1a(s string) uint64 {
    33      v := _H_basis
    34      m := (*rt.GoString)(unsafe.Pointer(&s))
    35  
    36      /* hash each byte */
    37      for i := 0; i < m.Len; i++ {
    38          v ^= uint64(*(*uint8)(unsafe.Pointer(uintptr(m.Ptr) + uintptr(i))))
    39          v *= _H_prime
    40      }
    41  
    42      /* never returns 0 for hash */
    43      if v == 0 {
    44          return 1
    45      } else {
    46          return v
    47      }
    48  }
    49  
    50  func TestHashing_Fnv1a(t *testing.T) {
    51      fmt.Printf("%#x\n", fnv1a("hello, world"))
    52  }
    53  
    54  func TestHashing_StrHash(t *testing.T) {
    55      s := "hello, world"
    56      fmt.Printf("%#x\n", StrHash(s))
    57  }
    58  
    59  var fn_fnv1a = fnv1a
    60  func BenchmarkHashing_Fnv1a(b *testing.B) {
    61      for i := 0; i < b.N; i++ {
    62          fn_fnv1a("accountid_interval_aweme_second")
    63      }
    64  }
    65  
    66  func BenchmarkHashing_StrHash(b *testing.B) {
    67      for i := 0; i < b.N; i++ {
    68          StrHash("accountid_interval_aweme_second")
    69      }
    70  }
    71
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