libgo: Update to weekly.2011-12-14.

[pf3gnuchains/gcc-fork.git] / libgo / go / math / atanh.go

diff --git a/libgo/go/math/atanh.go b/libgo/go/math/atanh.go
index ed38fca..e150673 100644 (file)
--- a/libgo/go/math/atanh.go
+++ b/libgo/go/math/atanh.go
@@ -39,9 +39,10 @@ package math
 // Atanh(x) calculates the inverse hyperbolic tangent of x.
 //
 // Special cases are:
-//     Atanh(x) = NaN if x < -1 or x > 1
 //     Atanh(1) = +Inf
+//     Atanh(±0) = ±0
 //     Atanh(-1) = -Inf
+//     Atanh(x) = NaN if x < -1 or x > 1
 //     Atanh(NaN) = NaN
 func Atanh(x float64) float64 {
        const NearZero = 1.0 / (1 << 28) // 2**-28