apd: add inline fast-path to BigInt.SetString

Not important, but easy enough to do and makes a difference for the performance of `Decimal.setString`, which cockroachdb#116 was interested in.
nvanbenschoten · Jun 16, 2022 · a4088d3 · a4088d3
1 parent 9f9f7a5
commit a4088d3
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/bigint.go b/bigint.go
@@ -886,6 +886,10 @@ func (z *BigInt) SetInt64(x int64) *BigInt {
 
 // SetString calls (big.Int).SetString.
 func (z *BigInt) SetString(s string, base int) (*BigInt, bool) {
+	if i, err := strconv.ParseInt(s, base, 64); err == nil {
+		z.SetInt64(i)
+		return z, true
+	}
 	var tmp1 big.Int //gcassert:noescape
 	zi := z.inner(&tmp1)
 	if _, ok := zi.SetString(s, base); !ok {