1 files changed, 11 insertions, 1 deletions
diff --git a/libgo/go/math/bits.go b/libgo/go/math/bits.go
index d36cd18d76b..a1dca3ed695 100644
--- a/libgo/go/math/bits.go
+++ b/libgo/go/math/bits.go
@@ -10,7 +10,7 @@ const (
 	uvneginf = 0xFFF0000000000000
 	mask     = 0x7FF
 	shift    = 64 - 11 - 1
-	bias     = 1022
+	bias     = 1023
 )
 
 // Inf returns positive infinity if sign >= 0, negative infinity if sign < 0.
@@ -47,3 +47,13 @@ func IsInf(f float64, sign int) bool {
 	//	return sign >= 0 && x == uvinf || sign <= 0 && x == uvneginf;
 	return sign >= 0 && f > MaxFloat64 || sign <= 0 && f < -MaxFloat64
 }
+
+// normalize returns a normal number y and exponent exp
+// satisfying x == y × 2**exp. It assumes x is finite and non-zero.
+func normalize(x float64) (y float64, exp int) {
+	const SmallestNormal = 2.2250738585072014e-308 // 2**-1022
+	if Fabs(x) < SmallestNormal {
+		return x * (1 << 52), -52
+	}
+	return x, 0
+}