From aacfe50a8236d826f9ac615a3a2611fd1487997d Mon Sep 17 00:00:00 2001
From: Jan de Mooij <jdemooij@mozilla.com>
Date: Mon, 15 Jul 2024 16:46:36 +0800
Subject: [PATCH] Bug 1720031 - Check for SetInitializedLength when reordering. r=iain

Reference:https://hg.mozilla.org/integration/autoland/rev/7528462f1eef91beaf5a97c78c44b3c35b7f5cd1
---
 js/src/jit/InstructionReordering.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/js/src/jit/InstructionReordering.cpp b/js/src/jit/InstructionReordering.cpp
index 191fcb2..224bf0f 100644
--- a/js/src/jit/InstructionReordering.cpp
+++ b/js/src/jit/InstructionReordering.cpp
@@ -141,6 +141,10 @@ bool jit::ReorderInstructions(MIRGraph& graph) {
         if (prev->isInterruptCheck()) {
           break;
         }
+        if (prev->isSetInitializedLength()) {
+          break;
+        }
+
 
         // The instruction can't be moved before any of its uses.
         bool isUse = false;
-- 
2.27.0