From 2bcd96f3fa94e3aba02c1867d8c7e810d5d3e431 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Olivier=20Fl=C3=BCckiger?= <olivf@chromium.org>
Date: Thu, 2 Feb 2023 19:32:59 +0100
Subject: [PATCH] [static-roots][x64] Load tagged root as quad word
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Experiment to see if this resolves a particular regression.

Bug: chromium:1407581
Bug: v8:13466
Change-Id: I45d68a14fab43775fae65dbe710d24db504f5486
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4218393
Reviewed-by: Jakob Linke <jgruber@chromium.org>
Commit-Queue: Jakob Linke <jgruber@chromium.org>
Auto-Submit: Olivier Flückiger <olivf@chromium.org>
Cr-Commit-Position: refs/heads/main@{#85667}
---
 src/codegen/x64/macro-assembler-x64.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/codegen/x64/macro-assembler-x64.cc b/src/codegen/x64/macro-assembler-x64.cc
index 53cdb123b2..75891c3237 100644
--- a/src/codegen/x64/macro-assembler-x64.cc
+++ b/src/codegen/x64/macro-assembler-x64.cc
@@ -165,7 +165,7 @@ Operand MacroAssembler::RootAsOperand(RootIndex index) {
 
 void MacroAssembler::LoadTaggedRoot(Register destination, RootIndex index) {
   if (V8_STATIC_ROOTS_BOOL && RootsTable::IsReadOnly(index)) {
-    mov_tagged(destination, Immediate(ReadOnlyRootPtr(index)));
+    movq(destination, Immediate(ReadOnlyRootPtr(index)));
     return;
   }
   DCHECK(root_array_available_);