From 72c503016c63d88a7ce73e4807defa65d30ec0a6 Mon Sep 17 00:00:00 2001
From: Tillmann Karras <tilkax@gmail.com>
Date: Fri, 5 Aug 2016 01:57:43 +0100
Subject: [PATCH] Fix Pack2x32To1x64

Not sure how to fix this properly.
---
 src/backend_x64/emit_x64.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/backend_x64/emit_x64.cpp b/src/backend_x64/emit_x64.cpp
index 673dcfd5..be3c5faf 100644
--- a/src/backend_x64/emit_x64.cpp
+++ b/src/backend_x64/emit_x64.cpp
@@ -281,7 +281,8 @@ void EmitX64::EmitPack2x32To1x64(IR::Block&, IR::Inst* inst) {
 
 void EmitX64::EmitLeastSignificantWord(IR::Block&, IR::Inst* inst) {
     // TODO: Optimize
-    reg_alloc.UseDefRegister(inst->GetArg(0), inst, any_gpr);
+    auto u64 = reg_alloc.UseDefRegister(inst->GetArg(0), inst, any_gpr);
+    code->MOVZX(64, 32, u64, R(u64));
 }
 
 void EmitX64::EmitMostSignificantWord(IR::Block&, IR::Inst* inst) {