From e3f650393744790e24820b2d6d99dd1da1a44de6 Mon Sep 17 00:00:00 2001
From: Aleksey Shipilev <shade@openjdk.org>
Date: Mon, 14 Oct 2024 07:55:38 +0000
Subject: [PATCH] 8341893: AArch64: Micro-optimize compressed ptr decoding

Reviewed-by: aph, fyang
---
 src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp b/src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp
index 16473b09fff..9835fb5aca1 100644
--- a/src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp
+++ b/src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp
@@ -5011,8 +5011,10 @@ void  MacroAssembler::decode_heap_oop(Register d, Register s) {
   verify_heapbase("MacroAssembler::decode_heap_oop: heap base corrupted?");
 #endif
   if (CompressedOops::base() == nullptr) {
-    if (CompressedOops::shift() != 0 || d != s) {
+    if (CompressedOops::shift() != 0) {
       lsl(d, s, CompressedOops::shift());
+    } else if (d != s) {
+      mov(d, s);
     }
   } else {
     Label done;