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fastlog2_test.go
// Copyright 2015 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. package runtime_test import ( "math" "runtime" "testing" ) func TestFastLog2(t *testing.T) { // Compute the euclidean distance between math.Log2 and the FastLog2 // implementation over the range of interest for heap sampling. const randomBitCount = 26 var e float64 inc := 1 if testing.Short() { // Check 1K total values, down from 64M. inc = 1 << 16 } for i := 1; i < 1<<randomBitCount; i += inc { l, fl := math.Log2(float64(i)), runtime.Fastlog2(float64(i)) d := l - fl e += d * d } e = math.Sqrt(e) if e > 1.0 { t.Fatalf("imprecision on fastlog2 implementation, want <=1.0, got %f", e) } }
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