Imported Upstream version 60upstream/60

1 files changed, 21 insertions, 0 deletions

diff --git a/src/pkg/math/fabs.go b/src/pkg/math/fabs.go
new file mode 100644
index 000000000..343123126
--- /dev/null
+++ b/src/pkg/math/fabs.go
@@ -0,0 +1,21 @@
+// 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
+}