github.com/rsc/tmp@v0.0.0-20240517235954-6deaab19748b/bootstrap/internal/gc/big/gcd_test.go (about)

     1  // Do not edit. Bootstrap copy of /Users/rsc/g/go/src/cmd/internal/gc/big/gcd_test.go
     2  
     3  // Copyright 2012 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  // This file implements a GCD benchmark.
     8  // Usage: go test math/big -test.bench GCD
     9  
    10  package big
    11  
    12  import (
    13  	"math/rand"
    14  	"testing"
    15  )
    16  
    17  // randInt returns a pseudo-random Int in the range [1<<(size-1), (1<<size) - 1]
    18  func randInt(r *rand.Rand, size uint) *Int {
    19  	n := new(Int).Lsh(intOne, size-1)
    20  	x := new(Int).Rand(r, n)
    21  	return x.Add(x, n) // make sure result > 1<<(size-1)
    22  }
    23  
    24  func runGCD(b *testing.B, aSize, bSize uint) {
    25  	b.StopTimer()
    26  	var r = rand.New(rand.NewSource(1234))
    27  	aa := randInt(r, aSize)
    28  	bb := randInt(r, bSize)
    29  	b.StartTimer()
    30  	for i := 0; i < b.N; i++ {
    31  		new(Int).GCD(nil, nil, aa, bb)
    32  	}
    33  }
    34  
    35  func BenchmarkGCD10x10(b *testing.B)         { runGCD(b, 10, 10) }
    36  func BenchmarkGCD10x100(b *testing.B)        { runGCD(b, 10, 100) }
    37  func BenchmarkGCD10x1000(b *testing.B)       { runGCD(b, 10, 1000) }
    38  func BenchmarkGCD10x10000(b *testing.B)      { runGCD(b, 10, 10000) }
    39  func BenchmarkGCD10x100000(b *testing.B)     { runGCD(b, 10, 100000) }
    40  func BenchmarkGCD100x100(b *testing.B)       { runGCD(b, 100, 100) }
    41  func BenchmarkGCD100x1000(b *testing.B)      { runGCD(b, 100, 1000) }
    42  func BenchmarkGCD100x10000(b *testing.B)     { runGCD(b, 100, 10000) }
    43  func BenchmarkGCD100x100000(b *testing.B)    { runGCD(b, 100, 100000) }
    44  func BenchmarkGCD1000x1000(b *testing.B)     { runGCD(b, 1000, 1000) }
    45  func BenchmarkGCD1000x10000(b *testing.B)    { runGCD(b, 1000, 10000) }
    46  func BenchmarkGCD1000x100000(b *testing.B)   { runGCD(b, 1000, 100000) }
    47  func BenchmarkGCD10000x10000(b *testing.B)   { runGCD(b, 10000, 10000) }
    48  func BenchmarkGCD10000x100000(b *testing.B)  { runGCD(b, 10000, 100000) }
    49  func BenchmarkGCD100000x100000(b *testing.B) { runGCD(b, 100000, 100000) }