From fcc9c8d570396506068e0a1d4123e32b195e6653 Mon Sep 17 00:00:00 2001
From: Fredrik Bredberg <fbredberg@openjdk.org>
Date: Wed, 9 Oct 2024 16:45:56 +0000
Subject: [PATCH] 8341854: Incorrect clearing of ZF in fast_unlock_lightweight
 on x86

Reviewed-by: stefank, aboldtch, pchilanomate, dcubed
---
 src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp b/src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp
index 839745f76ec..aba5344b7e4 100644
--- a/src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp
+++ b/src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp
@@ -822,7 +822,7 @@ void C2_MacroAssembler::fast_unlock_lightweight(Register obj, Register reg_rax,
     }
     movptr(Address(thread, JavaThread::unlocked_inflated_monitor_offset()), monitor);
 
-    testl(monitor, monitor);            // Fast Unlock ZF = 0
+    orl(t, 1); // Fast Unlock ZF = 0
     jmpb(slow_path);
 
     // Recursive unlock.