From 711bfaeea892d496644ceacad6ec4175e12b0c92 Mon Sep 17 00:00:00 2001
From: Tom Schuster <evilpies@gmail.com>
Date: Thu, 7 May 2020 12:09:34 +0000
Subject: [PATCH] Bug 1635878 - Transpile LoadTypedArrayLength. r=jandem

Depends on D74138

Differential Revision: https://phabricator.services.mozilla.com/D74140
---
 js/src/jit/CacheIROps.yaml           |  2 +-
 js/src/jit/WarpCacheIRTranspiler.cpp | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/js/src/jit/CacheIROps.yaml b/js/src/jit/CacheIROps.yaml
index 818cf68cc869..e5b9c9f430a5 100644
--- a/js/src/jit/CacheIROps.yaml
+++ b/js/src/jit/CacheIROps.yaml
@@ -906,7 +906,7 @@
 
 - name: LoadTypedArrayLengthResult
   shared: true
-  transpile: false
+  transpile: true
   args:
     obj: ObjId
 
diff --git a/js/src/jit/WarpCacheIRTranspiler.cpp b/js/src/jit/WarpCacheIRTranspiler.cpp
index 33f2c900db94..a608d8875ea6 100644
--- a/js/src/jit/WarpCacheIRTranspiler.cpp
+++ b/js/src/jit/WarpCacheIRTranspiler.cpp
@@ -416,6 +416,16 @@ bool WarpCacheIRTranspiler::emitLoadInt32ArrayLengthResult(ObjOperandId objId) {
   return true;
 }
 
+bool WarpCacheIRTranspiler::emitLoadTypedArrayLengthResult(ObjOperandId objId) {
+  MDefinition* obj = getOperand(objId);
+
+  auto* length = MTypedArrayLength::New(alloc(), obj);
+  add(length);
+
+  pushResult(length);
+  return true;
+}
+
 bool WarpCacheIRTranspiler::emitLoadStringLengthResult(StringOperandId strId) {
   MDefinition* str = getOperand(strId);