From 708761963e09ceb4619f8f21fffc7af051a8f020 Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Mon, 26 Feb 2018 15:56:34 -0300
Subject: [PATCH] Fix corner cases of ADCS and SBFM

---
 ChocolArm64/Instruction/AInstEmitAlu.cs       |  2 +-
 ChocolArm64/Instruction/AInstEmitAluHelper.cs | 25 +++++++++++++++++++
 ChocolArm64/Instruction/AInstEmitBfm.cs       |  9 -------
 3 files changed, 26 insertions(+), 10 deletions(-)

diff --git a/ChocolArm64/Instruction/AInstEmitAlu.cs b/ChocolArm64/Instruction/AInstEmitAlu.cs
index 71d9a660..57020364 100644
--- a/ChocolArm64/Instruction/AInstEmitAlu.cs
+++ b/ChocolArm64/Instruction/AInstEmitAlu.cs
@@ -39,7 +39,7 @@ namespace ChocolArm64.Instruction
             {
                 Context.EmitZNFlagCheck();
 
-                EmitAddsCCheck(Context);
+                EmitAdcsCCheck(Context);
                 EmitAddsVCheck(Context);
             }
 
diff --git a/ChocolArm64/Instruction/AInstEmitAluHelper.cs b/ChocolArm64/Instruction/AInstEmitAluHelper.cs
index b2ea92a6..ef9dd7a7 100644
--- a/ChocolArm64/Instruction/AInstEmitAluHelper.cs
+++ b/ChocolArm64/Instruction/AInstEmitAluHelper.cs
@@ -7,6 +7,31 @@ namespace ChocolArm64.Instruction
 {
     static class AInstEmitAluHelper
     {
+        public static void EmitAdcsCCheck(AILEmitterCtx Context)
+        {
+            //C = (Rd == Rn && CIn) || Rd < Rn
+            Context.EmitSttmp();
+            Context.EmitLdtmp();
+            Context.EmitLdtmp();
+
+            EmitDataLoadRn(Context);
+
+            Context.Emit(OpCodes.Ceq);
+
+            Context.EmitLdflg((int)APState.CBit);
+
+            Context.Emit(OpCodes.And);
+
+            Context.EmitLdtmp();
+
+            EmitDataLoadRn(Context);
+
+            Context.Emit(OpCodes.Clt_Un);
+            Context.Emit(OpCodes.Or);
+
+            Context.EmitStflg((int)APState.CBit);
+        }
+
         public static void EmitAddsCCheck(AILEmitterCtx Context)
         {
             //C = Rd < Rn
diff --git a/ChocolArm64/Instruction/AInstEmitBfm.cs b/ChocolArm64/Instruction/AInstEmitBfm.cs
index 823af738..2e8f2508 100644
--- a/ChocolArm64/Instruction/AInstEmitBfm.cs
+++ b/ChocolArm64/Instruction/AInstEmitBfm.cs
@@ -54,15 +54,6 @@ namespace ChocolArm64.Instruction
             {
                 EmitSbfmCast(Context, OpCodes.Conv_I4);
             }
-            else if (Op.Shift == 0)
-            {
-                Context.EmitLdintzr(Op.Rn);
-
-                Context.EmitLsl(BitsCount - 1 - Op.Pos);
-                Context.EmitAsr(BitsCount - 1);
-
-                Context.EmitStintzr(Op.Rd);
-            }
             else
             {
                 EmitBfmLoadRn(Context);