github.com/gopherd/gonum@v0.0.4/internal/math32/signbit.go (about)

     1  // Copyright 2010 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // Copyright ©2017 The Gonum Authors. All rights reserved.
     6  // Use of this source code is governed by a BSD-style
     7  // license that can be found in the LICENSE file.
     8  
     9  package math32
    10  
    11  import "math"
    12  
    13  // Signbit returns true if x is negative or negative zero.
    14  func Signbit(x float32) bool {
    15  	return math.Float32bits(x)&(1<<31) != 0
    16  }