From c785131ca5a6d24adc519e5e0bf1b69b671d912f Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Sun, 24 Jun 2018 13:18:03 +0200
Subject: [PATCH] ARM64: Fix write barrier in BC_USETS.

Contributed by Javier Guerra Giraldez.
---
 src/vm_arm64.dasc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/vm_arm64.dasc b/src/vm_arm64.dasc
index c55794a6..fb226e35 100644
--- a/src/vm_arm64.dasc
+++ b/src/vm_arm64.dasc
@@ -2780,7 +2780,7 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
     |2:  // Check if string is white and ensure upvalue is closed.
     |  ldrb TMP0w, UPVAL:CARG1->closed
     |    tst TMP1w, #LJ_GC_WHITES	// iswhite(str)
-    |  ccmp TMP0w, #0, #0, ne
+    |  ccmp TMP0w, #0, #4, ne
     |  beq <1
     |  // Crossed a write barrier. Move the barrier forward.
     |  mov CARG1, GL