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// 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 benchmark, taken from the shootuot, tests floating point performance.
package go1
import "testing"
func mandelbrot(n int) int {
const Iter = 50
const Zero float64 = 0
const Limit = 2.0
ok := 0
for y := 0; y < n; y++ {
for x := 0; x < n; x++ {
Zr, Zi, Tr, Ti := Zero, Zero, Zero, Zero
Cr := (2*float64(x)/float64(n) - 1.5)
Ci := (2*float64(y)/float64(n) - 1.0)
for i := 0; i < Iter && (Tr+Ti <= Limit*Limit); i++ {
Zi = 2*Zr*Zi + Ci
Zr = Tr - Ti + Cr
Tr = Zr * Zr
Ti = Zi * Zi
}
if Tr+Ti <= Limit*Limit {
ok++
}
}
}
return ok
}
func BenchmarkMandelbrot200(b *testing.B) {
for i := 0; i < b.N; i++ {
mandelbrot(200)
}
}
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