github.com/bytedance/gopkg@v0.0.0-20240514070511-01b2cbcf35e1/lang/mcache/utils_test.go (about)

     1  // Copyright 2021 ByteDance Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package mcache
    16  
    17  import (
    18  	"testing"
    19  
    20  	"github.com/stretchr/testify/assert"
    21  )
    22  
    23  func TestBsr(t *testing.T) {
    24  	assert.Equal(t, bsr(4), 2)
    25  	assert.Equal(t, bsr(24), 4)
    26  	assert.Equal(t, bsr((1<<10)-1), 9)
    27  	assert.Equal(t, bsr((1<<30)+(1<<19)+(1<<16)+(1<<1)), 30)
    28  }
    29  
    30  func BenchmarkBsr(b *testing.B) {
    31  	num := (1 << 30) + (1 << 19) + (1 << 16) + (1 << 1)
    32  
    33  	b.ReportAllocs()
    34  	b.ResetTimer()
    35  	for i := 0; i < b.N; i++ {
    36  		_ = bsr(num + i)
    37  	}
    38  }