From 03a7ebca4f6819658cdaa12ba3af54a17b8035e9 Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Fri, 25 Sep 2020 22:49:23 +0200
Subject: [PATCH] x64: Fix 64 bit shift code generation.

Reported by Philipp Kutin.
Fix contributed by Peter Cawley.
---
 src/lj_asm_x86.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lj_asm_x86.h b/src/lj_asm_x86.h
index e40b5e54..146371c1 100644
--- a/src/lj_asm_x86.h
+++ b/src/lj_asm_x86.h
@@ -2300,7 +2300,7 @@ static void asm_bitshift(ASMState *as, IRIns *ir, x86Shift xs, x86Op xv)
     dest = ra_dest(as, ir, rset_exclude(RSET_GPR, RID_ECX));
     if (dest == RID_ECX) {
       dest = ra_scratch(as, rset_exclude(RSET_GPR, RID_ECX));
-      emit_rr(as, XO_MOV, RID_ECX, dest);
+      emit_rr(as, XO_MOV, REX_64IR(ir, RID_ECX), dest);
     }
     right = irr->r;
     if (ra_noreg(right))