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Source file src/math/big/gcd_test.go

Documentation: math/big

  // Copyright 2012 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  // This file implements a GCD benchmark.
  // Usage: go test math/big -test.bench GCD
  
  package big
  
  import (
  	"math/rand"
  	"testing"
  )
  
  // randInt returns a pseudo-random Int in the range [1<<(size-1), (1<<size) - 1]
  func randInt(r *rand.Rand, size uint) *Int {
  	n := new(Int).Lsh(intOne, size-1)
  	x := new(Int).Rand(r, n)
  	return x.Add(x, n) // make sure result > 1<<(size-1)
  }
  
  func runGCD(b *testing.B, aSize, bSize uint) {
  	if isRaceBuilder && (aSize > 1000 || bSize > 1000) {
  		b.Skip("skipping on race builder")
  	}
  	b.Run("WithoutXY", func(b *testing.B) {
  		runGCDExt(b, aSize, bSize, false)
  	})
  	b.Run("WithXY", func(b *testing.B) {
  		runGCDExt(b, aSize, bSize, true)
  	})
  }
  
  func runGCDExt(b *testing.B, aSize, bSize uint, calcXY bool) {
  	b.StopTimer()
  	var r = rand.New(rand.NewSource(1234))
  	aa := randInt(r, aSize)
  	bb := randInt(r, bSize)
  	var x, y *Int
  	if calcXY {
  		x = new(Int)
  		y = new(Int)
  	}
  	b.StartTimer()
  	for i := 0; i < b.N; i++ {
  		new(Int).GCD(x, y, aa, bb)
  	}
  }
  
  func BenchmarkGCD10x10(b *testing.B)         { runGCD(b, 10, 10) }
  func BenchmarkGCD10x100(b *testing.B)        { runGCD(b, 10, 100) }
  func BenchmarkGCD10x1000(b *testing.B)       { runGCD(b, 10, 1000) }
  func BenchmarkGCD10x10000(b *testing.B)      { runGCD(b, 10, 10000) }
  func BenchmarkGCD10x100000(b *testing.B)     { runGCD(b, 10, 100000) }
  func BenchmarkGCD100x100(b *testing.B)       { runGCD(b, 100, 100) }
  func BenchmarkGCD100x1000(b *testing.B)      { runGCD(b, 100, 1000) }
  func BenchmarkGCD100x10000(b *testing.B)     { runGCD(b, 100, 10000) }
  func BenchmarkGCD100x100000(b *testing.B)    { runGCD(b, 100, 100000) }
  func BenchmarkGCD1000x1000(b *testing.B)     { runGCD(b, 1000, 1000) }
  func BenchmarkGCD1000x10000(b *testing.B)    { runGCD(b, 1000, 10000) }
  func BenchmarkGCD1000x100000(b *testing.B)   { runGCD(b, 1000, 100000) }
  func BenchmarkGCD10000x10000(b *testing.B)   { runGCD(b, 10000, 10000) }
  func BenchmarkGCD10000x100000(b *testing.B)  { runGCD(b, 10000, 100000) }
  func BenchmarkGCD100000x100000(b *testing.B) { runGCD(b, 100000, 100000) }
  

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