From 483a047db9d0b74d97661512f7761c63ffc6dbe9 Mon Sep 17 00:00:00 2001
From: Denis <ddenis1@yandex.ru>
Date: Thu, 9 Sep 2021 14:03:13 +0300
Subject: [PATCH] Improve performance of Abs() and Round() (#240)

---
 decimal.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/decimal.go b/decimal.go
index 4f6d81a..4e69557 100644
--- a/decimal.go
+++ b/decimal.go
@@ -457,6 +457,9 @@ func (d Decimal) rescale(exp int32) Decimal {
 
 // Abs returns the absolute value of the decimal.
 func (d Decimal) Abs() Decimal {
+	if !d.IsNegative() {
+		return d
+	}
 	d.ensureInitialized()
 	d2Value := new(big.Int).Abs(d.value)
 	return Decimal{
@@ -879,6 +882,9 @@ func (d Decimal) StringFixedCash(interval uint8) string {
 // 	   NewFromFloat(545).Round(-1).String() // output: "550"
 //
 func (d Decimal) Round(places int32) Decimal {
+	if d.exp == -places {
+		return d
+	}
 	// truncate to places + 1
 	ret := d.rescale(-places - 1)