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-rw-r--r--src/math/signbit.go10
1 files changed, 10 insertions, 0 deletions
diff --git a/src/math/signbit.go b/src/math/signbit.go
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+++ b/src/math/signbit.go
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+// Copyright 2010 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
+
+// Signbit reports whether x is negative or negative zero.
+func Signbit(x float64) bool {
+ return Float64bits(x)&(1<<63) != 0
+}