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https://github.com/golang/go
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42 lines
849 B
Go
42 lines
849 B
Go
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// This benchmark, taken from the shootuot, tests floating point performance.
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package go1
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import "testing"
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func mandelbrot(n int) int {
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const Iter = 50
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const Zero float64 = 0
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const Limit = 2.0
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ok := 0
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for y := 0; y < n; y++ {
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for x := 0; x < n; x++ {
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Zr, Zi, Tr, Ti := Zero, Zero, Zero, Zero
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Cr := (2*float64(x)/float64(n) - 1.5)
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Ci := (2*float64(y)/float64(n) - 1.0)
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for i := 0; i < Iter && (Tr+Ti <= Limit*Limit); i++ {
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Zi = 2*Zr*Zi + Ci
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Zr = Tr - Ti + Cr
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Tr = Zr * Zr
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Ti = Zi * Zi
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}
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if Tr+Ti <= Limit*Limit {
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ok++
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}
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}
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}
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return ok
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}
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func BenchmarkMandelbrot200(b *testing.B) {
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for i := 0; i < b.N; i++ {
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mandelbrot(200)
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}
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}
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