Optimize overflow for DynamicContainerInfo.updateValue() (#696)

pookjw · web-flow · commit 369a0486067c · 2026-01-01T23:20:35.000+08:00
diff --git a/Sources/OpenSwiftUICore/Layout/Dynamic/DynamicContainer.swift b/Sources/OpenSwiftUICore/Layout/Dynamic/DynamicContainer.swift
@@ -440,8 +440,8 @@ struct DynamicContainerInfo<Adapter>: StatefulRule, AsyncAttribute, ObservedAttr
                         if removedCount == 0 {
                             target = index
                         } else {
-                            let i = index - info.removedCount
-                            target = i >= 0 ? i : info.items.count - (info.unusedCount + info.removedCount)
+                            let i = index &- info.removedCount
+                            target = i >= 0 ? i : info.items.count &- (info.unusedCount + info.removedCount)
                         }
                     }
                     info.items[target].subgraph.index = UInt32(index)

Original file line number	Diff line number	Diff line change
`@@ -440,8 +440,8 @@ struct DynamicContainerInfo<Adapter>: StatefulRule, AsyncAttribute, ObservedAttr`
`440`	`440`	`if removedCount == 0 {`
`441`	`441`	`target = index`
`442`	`442`	`} else {`
`443`		`- let i = index - info.removedCount`
`444`		`- target = i >= 0 ? i : info.items.count - (info.unusedCount + info.removedCount)`
	`443`	`+ let i = index &- info.removedCount`
	`444`	`+ target = i >= 0 ? i : info.items.count &- (info.unusedCount + info.removedCount)`
`445`	`445`	`}`
`446`	`446`	`}`
`447`	`447`	`info.items[target].subgraph.index = UInt32(index)`