From b89681c5964c4d0b0ac53a36ec119ce4379c7e37 Mon Sep 17 00:00:00 2001
From: Unknown <gregoire.hage@gmail.com>
Date: Wed, 18 Jul 2018 01:55:23 +0200
Subject: [PATCH] Implement Sqshrun_V & Sqshrun_S

---
 ChocolArm64/AOpCodeTable.cs                   |  2 +
 ChocolArm64/Instruction/AInstEmitSimdShift.cs | 44 +++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/ChocolArm64/AOpCodeTable.cs b/ChocolArm64/AOpCodeTable.cs
index 0e979aa44..c22dc22e9 100644
--- a/ChocolArm64/AOpCodeTable.cs
+++ b/ChocolArm64/AOpCodeTable.cs
@@ -373,6 +373,8 @@ namespace ChocolArm64
             SetA64("0x001110<<1xxxxx100000xxxxxxxxxx", AInstEmit.Smlal_V,       typeof(AOpCodeSimdReg));
             SetA64("0x001110<<1xxxxx101000xxxxxxxxxx", AInstEmit.Smlsl_V,       typeof(AOpCodeSimdReg));
             SetA64("0x001110<<1xxxxx110000xxxxxxxxxx", AInstEmit.Smull_V,       typeof(AOpCodeSimdReg));
+            SetA64("0111111100>>>xxx100001xxxxxxxxxx", AInstEmit.Sqshrun_S,     typeof(AOpCodeSimdShImm));
+            SetA64("0x10111100>>>xxx100001xxxxxxxxxx", AInstEmit.Sqshrun_V,     typeof(AOpCodeSimdShImm));
             SetA64("0x00111100>>>xxx100111xxxxxxxxxx", AInstEmit.Sqrshrn_V,     typeof(AOpCodeSimdShImm));
             SetA64("01011110<<100001010010xxxxxxxxxx", AInstEmit.Sqxtn_S,       typeof(AOpCodeSimd));
             SetA64("0x001110<<100001010010xxxxxxxxxx", AInstEmit.Sqxtn_V,       typeof(AOpCodeSimd));
diff --git a/ChocolArm64/Instruction/AInstEmitSimdShift.cs b/ChocolArm64/Instruction/AInstEmitSimdShift.cs
index 6f6b56068..71d74f708 100644
--- a/ChocolArm64/Instruction/AInstEmitSimdShift.cs
+++ b/ChocolArm64/Instruction/AInstEmitSimdShift.cs
@@ -80,6 +80,50 @@ namespace ChocolArm64.Instruction
                 EmitVectorZeroUpper(Context, Op.Rd);
             }
         }
+		
+        public static void Sqshrun_S(AILEmitterCtx Context)
+        {
+            AOpCodeSimdShImm Op = (AOpCodeSimdShImm)Context.CurrOp;
+
+            int Shift = GetImmShr(Op);
+
+            long RoundConst = 1L << (Shift - 1);
+
+            Action Emit = () =>
+            {
+                Context.EmitLdc_I8(RoundConst);
+
+                Context.Emit(OpCodes.Add);
+
+                Context.EmitLdc_I4(Shift);
+
+                Context.Emit(OpCodes.Shr);
+            };
+
+            EmitScalarSaturatingNarrowOpSxZx(Context, Emit);
+        }
+		
+        public static void Sqshrun_V(AILEmitterCtx Context)
+        {
+            AOpCodeSimdShImm Op = (AOpCodeSimdShImm)Context.CurrOp;
+
+            int Shift = GetImmShr(Op);
+
+            long RoundConst = 1L << (Shift - 1);
+
+            Action Emit = () =>
+            {
+                Context.EmitLdc_I8(RoundConst);
+
+                Context.Emit(OpCodes.Add);
+
+                Context.EmitLdc_I4(Shift);
+
+                Context.Emit(OpCodes.Shr);
+            };
+
+            EmitVectorSaturatingNarrowOpSxZx(Context, Emit);
+        }
 
         public static void Sqrshrn_V(AILEmitterCtx Context)
         {