1 files changed, 81 insertions, 0 deletions
diff --git a/ChocolArm64/Instructions/InstEmitCcmp.cs b/ChocolArm64/Instructions/InstEmitCcmp.cs
new file mode 100644
index 00000000..b91104c9
--- /dev/null
+++ b/ChocolArm64/Instructions/InstEmitCcmp.cs
@@ -0,0 +1,81 @@
+using ChocolArm64.Decoders;
+using ChocolArm64.State;
+using ChocolArm64.Translation;
+using System;
+using System.Reflection.Emit;
+
+using static ChocolArm64.Instructions.InstEmitAluHelper;
+
+namespace ChocolArm64.Instructions
+{
+    static partial class InstEmit
+    {
+        private enum CcmpOp
+        {
+            Cmp,
+            Cmn
+        }
+
+        public static void Ccmn(ILEmitterCtx context) => EmitCcmp(context, CcmpOp.Cmn);
+        public static void Ccmp(ILEmitterCtx context) => EmitCcmp(context, CcmpOp.Cmp);
+
+        private static void EmitCcmp(ILEmitterCtx context, CcmpOp cmpOp)
+        {
+            OpCodeCcmp64 op = (OpCodeCcmp64)context.CurrOp;
+
+            ILLabel lblTrue = new ILLabel();
+            ILLabel lblEnd  = new ILLabel();
+
+            context.EmitCondBranch(lblTrue, op.Cond);
+
+            context.EmitLdc_I4((op.Nzcv >> 0) & 1);
+
+            context.EmitStflg((int)PState.VBit);
+
+            context.EmitLdc_I4((op.Nzcv >> 1) & 1);
+
+            context.EmitStflg((int)PState.CBit);
+
+            context.EmitLdc_I4((op.Nzcv >> 2) & 1);
+
+            context.EmitStflg((int)PState.ZBit);
+
+            context.EmitLdc_I4((op.Nzcv >> 3) & 1);
+
+            context.EmitStflg((int)PState.NBit);
+
+            context.Emit(OpCodes.Br_S, lblEnd);
+
+            context.MarkLabel(lblTrue);
+
+            EmitDataLoadOpers(context);
+
+            if (cmpOp == CcmpOp.Cmp)
+            {
+                context.Emit(OpCodes.Sub);
+
+                context.EmitZnFlagCheck();
+
+                EmitSubsCCheck(context);
+                EmitSubsVCheck(context);
+            }
+            else if (cmpOp == CcmpOp.Cmn)
+            {
+                context.Emit(OpCodes.Add);
+
+                context.EmitZnFlagCheck();
+
+                EmitAddsCCheck(context);
+                EmitAddsVCheck(context);
+            }
+            else
+            {
+                throw new ArgumentException(nameof(cmpOp));
+            }
+
+            context.Emit(OpCodes.Pop);
+
+            context.MarkLabel(lblEnd);
+        }
+    }
+}
+\ No newline at end of file