Imported Upstream version 1.4upstream/1.4

1 files changed, 0 insertions, 71 deletions

diff --git a/src/pkg/math/atan2.go b/src/pkg/math/atan2.go
deleted file mode 100644
index d84b332c9..000000000
--- a/src/pkg/math/atan2.go
+++ /dev/null
@@ -1,71 +0,0 @@
-// 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
-
-// Atan2 returns the arc tangent of y/x, using
-// the signs of the two to determine the quadrant
-// of the return value.
-//
-// Special cases are (in order):
-//	Atan2(y, NaN) = NaN
-//	Atan2(NaN, x) = NaN
-//	Atan2(+0, x>=0) = +0
-//	Atan2(-0, x>=0) = -0
-//	Atan2(+0, x<=-0) = +Pi
-//	Atan2(-0, x<=-0) = -Pi
-//	Atan2(y>0, 0) = +Pi/2
-//	Atan2(y<0, 0) = -Pi/2
-//	Atan2(+Inf, +Inf) = +Pi/4
-//	Atan2(-Inf, +Inf) = -Pi/4
-//	Atan2(+Inf, -Inf) = 3Pi/4
-//	Atan2(-Inf, -Inf) = -3Pi/4
-//	Atan2(y, +Inf) = 0
-//	Atan2(y>0, -Inf) = +Pi
-//	Atan2(y<0, -Inf) = -Pi
-//	Atan2(+Inf, x) = +Pi/2
-//	Atan2(-Inf, x) = -Pi/2
-func Atan2(y, x float64) float64
-
-func atan2(y, x float64) float64 {
-	// special cases
-	switch {
-	case IsNaN(y) || IsNaN(x):
-		return NaN()
-	case y == 0:
-		if x >= 0 && !Signbit(x) {
-			return Copysign(0, y)
-		}
-		return Copysign(Pi, y)
-	case x == 0:
-		return Copysign(Pi/2, y)
-	case IsInf(x, 0):
-		if IsInf(x, 1) {
-			switch {
-			case IsInf(y, 0):
-				return Copysign(Pi/4, y)
-			default:
-				return Copysign(0, y)
-			}
-		}
-		switch {
-		case IsInf(y, 0):
-			return Copysign(3*Pi/4, y)
-		default:
-			return Copysign(Pi, y)
-		}
-	case IsInf(y, 0):
-		return Copysign(Pi/2, y)
-	}
-
-	// Call atan and determine the quadrant.
-	q := Atan(y / x)
-	if x < 0 {
-		if q <= 0 {
-			return q + Pi
-		}
-		return q - Pi
-	}
-	return q
-}