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diff --git a/libgo/go/math/fabs.go b/libgo/go/math/fabs.go
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+// Copyright 2009 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 math
+
+// Fabs returns the absolute value of x.
+//
+// Special cases are:
+//	Fabs(+Inf) = +Inf
+//	Fabs(-Inf) = +Inf
+//	Fabs(NaN) = NaN
+func Fabs(x float64) float64 {
+	switch {
+	case x < 0:
+		return -x
+	case x == 0:
+		return 0 // return correctly fabs(-0)
+	}
+	return x
+}