File: 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.

// Copyright ©2017 The Gonum 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 math32

import "math"

// Signbit returns true if x is negative or negative zero.
func Signbit(x float32) bool {
	return math.Float32bits(x)&(1<<31) != 0
}