From e6881b5b422977916bc7774d05dcea8d7becff23 Mon Sep 17 00:00:00 2001
From: Pawel Kozlowski <pkozlowski.opensource@gmail.com>
Date: Thu, 3 Oct 2019 12:27:02 +0200
Subject: [PATCH] perf(ivy): limit TNode.inputs reads on first template pass
 (#32979)

PR Close #32979
---
 packages/core/src/render3/instructions/element.ts | 12 +-----------
 packages/core/src/render3/instructions/shared.ts  |  9 +++++++++
 2 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/packages/core/src/render3/instructions/element.ts b/packages/core/src/render3/instructions/element.ts
index 5c4b7c5080..6c8e1eb4a1 100644
--- a/packages/core/src/render3/instructions/element.ts
+++ b/packages/core/src/render3/instructions/element.ts
@@ -10,7 +10,7 @@ import {assertDataInRange, assertDefined, assertEqual} from '../../util/assert';
 import {assertHasParent} from '../assert';
 import {attachPatchData} from '../context_discovery';
 import {registerPostOrderHooks} from '../hooks';
-import {TAttributes, TNodeFlags, TNodeType} from '../interfaces/node';
+import {TAttributes, TNodeType} from '../interfaces/node';
 import {RElement} from '../interfaces/renderer';
 import {StylingMapArray, TStylingContext} from '../interfaces/styling';
 import {isContentQueryHost, isDirectiveHost} from '../interfaces/type_checks';
@@ -84,16 +84,6 @@ export function ɵɵelementStart(
     ngDevMode && ngDevMode.firstTemplatePass++;
     resolveDirectives(tView, lView, tNode, localRefs || null);
 
-    const inputData = tNode.inputs;
-    if (inputData != null) {
-      if (inputData.hasOwnProperty('class')) {
-        tNode.flags |= TNodeFlags.hasClassInput;
-      }
-      if (inputData.hasOwnProperty('style')) {
-        tNode.flags |= TNodeFlags.hasStyleInput;
-      }
-    }
-
     if (tView.queries !== null) {
       tView.queries.elementStart(tView, tNode);
     }
diff --git a/packages/core/src/render3/instructions/shared.ts b/packages/core/src/render3/instructions/shared.ts
index d26f1691f8..8ca5f47cc4 100644
--- a/packages/core/src/render3/instructions/shared.ts
+++ b/packages/core/src/render3/instructions/shared.ts
@@ -843,6 +843,15 @@ function initializeInputAndOutputAliases(tView: TView, tNode: TNode): void {
     outputsStore = generatePropertyAliases(directiveDef.outputs, i, outputsStore);
   }
 
+  if (inputsStore !== null) {
+    if (inputsStore.hasOwnProperty('class')) {
+      tNode.flags |= TNodeFlags.hasClassInput;
+    }
+    if (inputsStore.hasOwnProperty('style')) {
+      tNode.flags |= TNodeFlags.hasStyleInput;
+    }
+  }
+
   tNode.inputs = inputsStore;
   tNode.outputs = outputsStore;
 }