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[vm] Remove redundant type-checks from core libraries.
In conjunction with previous revisions, this improves several Flutter microbenchmarks by 2-4%. Change-Id: Ic864fd586dc57d87b80cebd6ceace0a8165fa82b Reviewed-on: https://dart-review.googlesource.com/c/88702 Commit-Queue: Samir Jindel <sjindel@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com>
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@ -572,3 +572,30 @@ abstract class _InternalSet<E> extends _SetBase<E> {
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iterator);
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}
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}
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@patch
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abstract class _SplayTree<K, Node extends _SplayTreeNode<K>> {
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@patch
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Node _splayMin(Node node) {
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Node current = node;
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while (current.left != null) {
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Node left = current.left;
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current.left = left.right;
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left.right = current;
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current = left;
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}
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return current;
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}
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@patch
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Node _splayMax(Node node) {
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Node current = node;
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while (current.right != null) {
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Node right = current.right;
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current.right = right.left;
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right.left = current;
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current = right;
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}
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return current;
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}
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}
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@ -24,7 +24,7 @@ class List<E> {
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@patch
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factory List.from(Iterable elements, {bool growable: true}) {
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if (elements is EfficientLengthIterable) {
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if (elements is EfficientLengthIterable<E>) {
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int length = elements.length;
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var list = growable ? new _GrowableList<E>(length) : new _List<E>(length);
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if (length > 0) {
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@ -36,12 +36,25 @@ class List<E> {
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}
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return list;
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}
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// If elements is an Iterable<E>, we won't need a type-test for each
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// element. In the "common case" that elements is an Iterable<E>, this
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// replaces a type-test on every element with a single type-test before
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// starting the loop.
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if (elements is Iterable<E>) {
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List<E> list = new _GrowableList<E>(0);
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for (E e in elements) {
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list.add(e);
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}
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if (growable) return list;
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return makeListFixedLength(list);
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} else {
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List<E> list = new _GrowableList<E>(0);
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for (E e in elements) {
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list.add(e);
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}
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if (growable) return list;
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return makeListFixedLength(list);
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}
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}
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@patch
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@ -908,3 +908,31 @@ class LinkedHashSet<E> {
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@patch
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factory LinkedHashSet.identity() => new _CompactLinkedIdentityHashSet<E>();
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}
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@patch
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abstract class _SplayTree<K, Node extends _SplayTreeNode<K>> {
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// We override _splayMin and _splayMax to optimize type-checks.
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@patch
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Node _splayMin(Node node) {
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Node current = node;
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while (current.left != null) {
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Node left = internal.unsafeCast<Node>(current.left);
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current.left = left.right;
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left.right = current;
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current = left;
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}
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return current;
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}
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@patch
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Node _splayMax(Node node) {
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Node current = node;
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while (current.right != null) {
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Node right = internal.unsafeCast<Node>(current.right);
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current.right = right.left;
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right.left = current;
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current = right;
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}
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return current;
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}
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}
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@ -433,7 +433,8 @@ class _CompactIterator<E> implements Iterator<E> {
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final int _checkSum;
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E current;
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_CompactIterator(table, this._data, this._len, this._offset, this._step)
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_CompactIterator(
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_HashBase table, this._data, this._len, this._offset, this._step)
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: _table = table,
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_checkSum = table._checkSum;
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@ -445,7 +446,7 @@ class _CompactIterator<E> implements Iterator<E> {
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_offset += _step;
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} while (_offset < _len && _HashBase._isDeleted(_data, _data[_offset]));
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if (_offset < _len) {
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current = _data[_offset];
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current = internal.unsafeCast<E>(_data[_offset]);
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return true;
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} else {
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current = null;
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@ -24,7 +24,8 @@ import "dart:_internal"
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is64Bit,
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makeFixedListUnmodifiable,
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makeListFixedLength,
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patch;
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patch,
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unsafeCast;
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import "dart:async" show Completer, Future, Timer;
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@ -116,8 +117,8 @@ class _SyncIterable<T> extends IterableBase<T> {
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Iterator<T> get iterator {
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// Note: _Closure._clone returns _Closure which is not related to
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// _SyncGeneratorCallback, which means we need explicit cast.
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return new _SyncIterator<T>(
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(_moveNextFn as _Closure)._clone() as _SyncGeneratorCallback<T>);
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return new _SyncIterator<T>(unsafeCast<_SyncGeneratorCallback<T>>(
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unsafeCast<_Closure>(_moveNextFn)._clone()));
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}
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}
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@ -1673,3 +1673,30 @@ class _LinkedHashSetIterator<E> implements Iterator<E> {
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}
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}
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}
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@patch
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abstract class _SplayTree<K, Node extends _SplayTreeNode<K>> {
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@patch
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Node _splayMin(Node node) {
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Node current = node;
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while (current.left != null) {
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Node left = current.left;
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current.left = left.right;
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left.right = current;
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current = left;
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}
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return current;
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}
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@patch
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Node _splayMax(Node node) {
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Node current = node;
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while (current.right != null) {
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Node right = current.right;
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current.right = right.left;
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right.left = current;
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current = right;
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}
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return current;
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}
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}
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@ -147,32 +147,14 @@ abstract class _SplayTree<K, Node extends _SplayTreeNode<K>> {
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// anchored at [node].
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// and that node is returned. It should replace the reference to [node]
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// in any parent tree or root pointer.
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Node _splayMin(Node node) {
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Node current = node;
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while (current.left != null) {
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Node left = current.left;
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current.left = left.right;
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left.right = current;
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current = left;
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}
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return current;
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}
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external Node _splayMin(Node node);
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// Emulates splaying with a key that is greater than any in the subtree
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// anchored at [node].
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// After this, the largest element in the tree is the root of the subtree,
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// and that node is returned. It should replace the reference to [node]
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// in any parent tree or root pointer.
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Node _splayMax(Node node) {
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Node current = node;
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while (current.right != null) {
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Node right = current.right;
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current.right = right.left;
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right.left = current;
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current = right;
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}
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return current;
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}
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external Node _splayMax(Node node);
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Node _remove(K key) {
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if (_root == null) return null;
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