atomicx: Add Inc/Dec

Author: mattrobenolt

internal/atomicx/atomicx.go

@@ -45,6 +45,14 @@ type Sum struct {
 	f [2]atomic.Uint64
 }
 
+func (x *Sum) Inc() {
+	x.i.Add(1)
+}
+
+func (x *Sum) Dec() {
+	x.i.Add(^uint64(0))
+}
+
 func (x *Sum) AddUint64(val uint64) {
 	if val == 0 {
 		return
@@ -57,6 +65,11 @@ func (x *Sum) Add(val float64) {
 		return
 	}
 
+	if val == 1 {
+		x.Inc()
+		return
+	}
+
 	// if we're less than 1, we must be a float
 	if val >= 1 {
 		// Fast path to first check if the value is actually a whole number in