lsh rsh fallbacj

Author: markovichecha

.DS_Store

@@ -898,20 +898,33 @@ func (d Decimal) Lsh(bits uint) Decimal {
 
 	if d.coef.bigInt != nil {
 		d.coef.bigInt = d.coef.bigInt.Lsh(d.coef.bigInt, bits)
-	} else {
-		d.coef.u128 = d.coef.u128.Lsh(bits)
+		return d
+	}
+
+	if bits >= 128 || (d.coef.u128.hi > 0 && bits >= 64) ||
+		(d.coef.u128.hi > 0 && (d.coef.u128.hi<<bits)>>bits != d.coef.u128.hi) {
+		bigInt := d.coef.GetBig()
+		bigInt = bigInt.Lsh(bigInt, bits)
+		return newDecimal(d.neg, bintFromBigInt(bigInt), d.prec)
 	}
 
+	d.coef.u128 = d.coef.u128.Lsh(bits)
+
 	return d
 }
 
 func (d Decimal) Rsh(bits uint) Decimal {
+	if bits == 0 {
+		return d
+	}
+
 	if d.coef.bigInt != nil {
 		d.coef.bigInt = d.coef.bigInt.Rsh(d.coef.bigInt, bits)
-	} else {
-		d.coef.u128 = d.coef.u128.Rsh(bits)
+		return d
 	}
 
+	d.coef.u128 = d.coef.u128.Rsh(bits)
+
 	return d
 }