1 files changed, 22 insertions, 0 deletions
diff --git a/src/math/abs.go b/src/math/abs.go
new file mode 100644
index 000000000..bc41a6d6b
--- /dev/null
+++ b/src/math/abs.go
@@ -0,0 +1,22 @@
+// 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
+
+// Abs returns the absolute value of x.
+//
+// Special cases are:
+//	Abs(±Inf) = +Inf
+//	Abs(NaN) = NaN
+func Abs(x float64) float64
+
+func abs(x float64) float64 {
+	switch {
+	case x < 0:
+		return -x
+	case x == 0:
+		return 0 // return correctly abs(-0)
+	}
+	return x
+}