From e73c3909272b620ec6fd66f17857796b8a3fa714 Mon Sep 17 00:00:00 2001
From: Merry <git@mary.rs>
Date: Sat, 30 Jul 2022 12:19:06 +0100
Subject: [PATCH] emit_arm64_packed: Fix signed packed add sub

---
 src/dynarmic/backend/arm64/emit_arm64_packed.cpp | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/dynarmic/backend/arm64/emit_arm64_packed.cpp b/src/dynarmic/backend/arm64/emit_arm64_packed.cpp
index 9297e047..5a10ba74 100644
--- a/src/dynarmic/backend/arm64/emit_arm64_packed.cpp
+++ b/src/dynarmic/backend/arm64/emit_arm64_packed.cpp
@@ -248,9 +248,14 @@ static void EmitPackedAddSub(oaknut::CodeGenerator& code, EmitContext& ctx, IR::
         auto Vge = ctx.reg_alloc.WriteD(ge_inst);
         RegAlloc::Realize(Vge);
 
-        code.CMEQ(Vge->H4(), Vresult->H4(), 0);
-        code.EOR(Vge->B8(), Vge->B8(), V2.B8());
-        code.SHRN(Vge->H4(), Vge->toQ().S4(), 16);
+        if (is_signed) {
+            code.CMGE(Vge->S2(), Vresult->S2(), 0);
+            code.XTN(Vge->H4(), Vge->toQ().S4());
+        } else {
+            code.CMEQ(Vge->H4(), Vresult->H4(), 0);
+            code.EOR(Vge->B8(), Vge->B8(), V2.B8());
+            code.SHRN(Vge->H4(), Vge->toQ().S4(), 16);
+        }
     }
 
     code.XTN(Vresult->H4(), Vresult->toQ().S4());