From e4777717cdf70c61365494cdb91568172fa5bfe8 Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Mon, 12 Oct 2020 21:46:04 -0300
Subject: [PATCH] Implement LEA.HI shader instruction (#1609)

---
 .../Decoders/OpCodeTable.cs                   |  2 +
 .../Instructions/InstEmitAlu.cs               | 45 +++++++++++++++++++
 .../Instructions/InstEmitAluHelper.cs         | 10 +++++
 3 files changed, 57 insertions(+)

diff --git a/Ryujinx.Graphics.Shader/Decoders/OpCodeTable.cs b/Ryujinx.Graphics.Shader/Decoders/OpCodeTable.cs
index eef36a954..edbd8bb29 100644
--- a/Ryujinx.Graphics.Shader/Decoders/OpCodeTable.cs
+++ b/Ryujinx.Graphics.Shader/Decoders/OpCodeTable.cs
@@ -179,6 +179,8 @@ namespace Ryujinx.Graphics.Shader.Decoders
             Set("010010111101xx", InstEmit.Lea,     typeof(OpCodeAluCbuf));
             Set("0011011x11010x", InstEmit.Lea,     typeof(OpCodeAluImm));
             Set("0101101111010x", InstEmit.Lea,     typeof(OpCodeAluReg));
+            Set("000110xxxxxxxx", InstEmit.Lea_Hi,  typeof(OpCodeAluCbuf));
+            Set("0101101111011x", InstEmit.Lea_Hi,  typeof(OpCodeAluReg));
             Set("0100110001000x", InstEmit.Lop,     typeof(OpCodeLopCbuf));
             Set("0011100001000x", InstEmit.Lop,     typeof(OpCodeLopImm));
             Set("000001xxxxxxxx", InstEmit.Lop,     typeof(OpCodeLopImm32));
diff --git a/Ryujinx.Graphics.Shader/Instructions/InstEmitAlu.cs b/Ryujinx.Graphics.Shader/Instructions/InstEmitAlu.cs
index b883edc13..5d00adb56 100644
--- a/Ryujinx.Graphics.Shader/Instructions/InstEmitAlu.cs
+++ b/Ryujinx.Graphics.Shader/Instructions/InstEmitAlu.cs
@@ -405,6 +405,51 @@ namespace Ryujinx.Graphics.Shader.Instructions
             // TODO: CC, X
         }
 
+        public static void Lea_Hi(EmitterContext context)
+        {
+            OpCodeAlu op = (OpCodeAlu)context.CurrOp;
+
+            bool isReg = op is OpCodeAluReg;
+            bool negateA;
+            int shift;
+
+            if (isReg)
+            {
+                negateA = op.RawOpCode.Extract(37);
+                shift   = op.RawOpCode.Extract(28, 5);
+            }
+            else
+            {
+                negateA = op.RawOpCode.Extract(56);
+                shift   = op.RawOpCode.Extract(51, 5);
+            }
+
+            Operand srcA = GetSrcA(context);
+            Operand srcB = GetSrcB(context);
+            Operand srcC = GetSrcC(context);
+
+            Operand aLow = context.ShiftLeft(srcA, Const(shift));
+            Operand aHigh = shift == 0 ? Const(0) : context.ShiftRightU32(srcA, Const(32 - shift));
+            aHigh = context.BitwiseOr(aHigh, context.ShiftLeft(srcC, Const(shift)));
+
+            if (negateA)
+            {
+                // Perform 64-bit negation by doing bitwise not of the value,
+                // then adding 1 and carrying over from low to high.
+                aLow = context.BitwiseNot(aLow);
+                aHigh = context.BitwiseNot(aHigh);
+
+                aLow = AddWithCarry(context, aLow, Const(1), out Operand aLowCOut);
+                aHigh = context.IAdd(aHigh, aLowCOut);
+            }
+
+            Operand res = context.IAdd(aHigh, srcB);
+
+            context.Copy(GetDest(context), res);
+
+            // TODO: CC, X
+        }
+
         public static void Lop(EmitterContext context)
         {
             IOpCodeLop op = (IOpCodeLop)context.CurrOp;
diff --git a/Ryujinx.Graphics.Shader/Instructions/InstEmitAluHelper.cs b/Ryujinx.Graphics.Shader/Instructions/InstEmitAluHelper.cs
index 588ec2163..7fe969a0e 100644
--- a/Ryujinx.Graphics.Shader/Instructions/InstEmitAluHelper.cs
+++ b/Ryujinx.Graphics.Shader/Instructions/InstEmitAluHelper.cs
@@ -100,5 +100,15 @@ namespace Ryujinx.Graphics.Shader.Instructions
                 context.Copy(GetNF(), context.FPCompareLess (dest, zero, fpType));
             }
         }
+
+        public static Operand AddWithCarry(EmitterContext context, Operand lhs, Operand rhs, out Operand carryOut)
+        {
+            Operand result = context.IAdd(lhs, rhs);
+
+            // C = Rd < Rn
+            carryOut = context.INegate(context.ICompareLessUnsigned(result, lhs));
+
+            return result;
+        }
     }
 }
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