Imported Upstream version 1.1~hg20130304upstream/1.1_hg20130304

1 files changed, 21 insertions, 6 deletions

diff --git a/src/pkg/math/gamma.go b/src/pkg/math/gamma.go
index 7c6f421ba..164f54f33 100644
--- a/src/pkg/math/gamma.go
+++ b/src/pkg/math/gamma.go
@@ -110,19 +110,26 @@ func stirling(x float64) float64 {
 	return y
 }
 
-// Gamma(x) returns the Gamma function of x.
+// Gamma returns the Gamma function of x.
 //
 // Special cases are:
-//	Gamma(±Inf) = ±Inf
+//	Gamma(+Inf) = +Inf
+//	Gamma(+0) = +Inf
+//	Gamma(-0) = -Inf
+//	Gamma(x) = NaN for integer x < 0
+//	Gamma(-Inf) = NaN
 //	Gamma(NaN) = NaN
-// Large values overflow to +Inf.
-// Zero and negative integer arguments return ±Inf.
 func Gamma(x float64) float64 {
 	const Euler = 0.57721566490153286060651209008240243104215933593992 // A001620
 	// special cases
 	switch {
-	case IsInf(x, -1) || IsNaN(x):
-		return x
+	case isNegInt(x) || IsInf(x, -1) || IsNaN(x):
+		return NaN()
+	case x == 0:
+		if Signbit(x) {
+			return Inf(-1)
+		}
+		return Inf(1)
 	case x < -170.5674972726612 || x > 171.61447887182298:
 		return Inf(1)
 	}
@@ -185,3 +192,11 @@ small:
 	}
 	return z / ((1 + Euler*x) * x)
 }
+
+func isNegInt(x float64) bool {
+	if x < 0 {
+		_, xf := Modf(x)
+		return xf == 0
+	}
+	return false
+}