Property binding perf improvements

packages/core/src/render3/bindings.ts

@@ -12,8 +12,6 @@ import {throwErrorIfNoChangesMode} from './errors';
 import {LView} from './interfaces/view';
 import {getCheckNoChangesMode} from './state';
 import {NO_CHANGE} from './tokens';
-import {isDifferent} from './util/misc_utils';
-
 
 
 // TODO(misko): consider inlining
@@ -36,9 +34,11 @@ export function bindingUpdated(lView: LView, bindingIndex: number, value: any):
   ngDevMode && assertNotSame(value, NO_CHANGE, 'Incoming value should never be NO_CHANGE.');
   ngDevMode &&
       assertLessThan(bindingIndex, lView.length, `Slot should have been initialized to NO_CHANGE`);
-
   const oldValue = lView[bindingIndex];
-  if (isDifferent(oldValue, value)) {
+
+  if (Object.is(oldValue, value)) {
+    return false;
+  } else {
     if (ngDevMode && getCheckNoChangesMode()) {
       // View engine didn't report undefined values as changed on the first checkNoChanges pass
       // (before the change detection was run).
@@ -50,8 +50,6 @@ export function bindingUpdated(lView: LView, bindingIndex: number, value: any):
     lView[bindingIndex] = value;
     return true;
   }
-
-  return false;
 }
 
 /** Updates 2 bindings if changed, then returns whether either was updated. */

packages/core/src/render3/instructions/property.ts

@@ -5,7 +5,6 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import {assertNotEqual} from '../../util/assert';
 import {bindingUpdated} from '../bindings';
 import {SanitizerFn} from '../interfaces/sanitization';
 import {BINDING_INDEX, LView} from '../interfaces/view';
@@ -35,12 +34,10 @@ import {TsickleIssue1009, elementPropertyInternal, storeBindingMetadata} from '.
  */
 export function ɵɵproperty<T>(
     propName: string, value: T, sanitizer?: SanitizerFn | null): TsickleIssue1009 {
-  const index = getSelectedIndex();
-  ngDevMode && assertNotEqual(index, -1, 'selected index cannot be -1');
   const lView = getLView();
   const bindReconciledValue = bind(lView, value);
   if (bindReconciledValue !== NO_CHANGE) {
-    elementPropertyInternal(index, propName, bindReconciledValue, sanitizer);
+    elementPropertyInternal(getSelectedIndex(), propName, bindReconciledValue, sanitizer);
   }
   return ɵɵproperty;
 }

packages/core/src/render3/styling_next/util.ts

@@ -6,7 +6,6 @@
 * found in the LICENSE file at https://angular.io/license
 */
 import {TNode, TNodeFlags} from '../interfaces/node';
-import {isDifferent} from '../util/misc_utils';
 
 import {StylingMapArray, StylingMapArrayIndex, TStylingConfigFlags, TStylingContext, TStylingContextIndex, TStylingContextPropConfigFlags} from './interfaces';
 
@@ -160,7 +159,7 @@ export function hasValueChanged(
   if (compareValueB instanceof String) {
     compareValueB = compareValueB.toString();
   }
-  return isDifferent(compareValueA, compareValueB);
+  return !Object.is(compareValueA, compareValueB);
 }
 
 /**

packages/core/src/render3/util/misc_utils.ts

@@ -8,18 +8,6 @@
 
 import {global} from '../../util/global';
 import {RElement} from '../interfaces/renderer';
-import {NO_CHANGE} from '../tokens';
-
-/**
- * Returns whether the values are different from a change detection stand point.
- *
- * Constraints are relaxed in checkNoChanges mode. See `devModeEqual` for details.
- */
-export function isDifferent(a: any, b: any): boolean {
-  // NaN is the only value that is not equal to itself so the first
-  // test checks if both a and b are not NaN
-  return !(a !== a && b !== b) && a !== b;
-}
 
 /**
  * Used for stringify render output in Ivy.

packages/core/test/bundling/todo/bundle.golden_symbols.json

@@ -1007,9 +1007,6 @@
   {
     "name": "isDevMode"
   },
-  {
-    "name": "isDifferent"
-  },
   {
     "name": "isFactory"
   },