Initial work

1 files changed, 88 insertions, 0 deletions

diff --git a/Ryujinx.Graphics.Shader/Instructions/InstEmitAluHelper.cs b/Ryujinx.Graphics.Shader/Instructions/InstEmitAluHelper.cs
new file mode 100644
index 00000000..5c4f5398
--- /dev/null
+++ b/Ryujinx.Graphics.Shader/Instructions/InstEmitAluHelper.cs
@@ -0,0 +1,88 @@
+using Ryujinx.Graphics.Shader.Decoders;
+using Ryujinx.Graphics.Shader.IntermediateRepresentation;
+using Ryujinx.Graphics.Shader.Translation;
+using System;
+
+using static Ryujinx.Graphics.Shader.Instructions.InstEmitHelper;
+using static Ryujinx.Graphics.Shader.IntermediateRepresentation.OperandHelper;
+
+namespace Ryujinx.Graphics.Shader.Instructions
+{
+    static class InstEmitAluHelper
+    {
+        public static int GetIntMin(IntegerType type)
+        {
+            switch (type)
+            {
+                case IntegerType.U8:  return byte.MinValue;
+                case IntegerType.S8:  return sbyte.MinValue;
+                case IntegerType.U16: return ushort.MinValue;
+                case IntegerType.S16: return short.MinValue;
+                case IntegerType.U32: return (int)uint.MinValue;
+                case IntegerType.S32: return int.MinValue;
+            }
+
+            throw new ArgumentException($"The type \"{type}\" is not a supported int type.");
+        }
+
+        public static int GetIntMax(IntegerType type)
+        {
+            switch (type)
+            {
+                case IntegerType.U8:  return byte.MaxValue;
+                case IntegerType.S8:  return sbyte.MaxValue;
+                case IntegerType.U16: return ushort.MaxValue;
+                case IntegerType.S16: return short.MaxValue;
+                case IntegerType.U32: return unchecked((int)uint.MaxValue);
+                case IntegerType.S32: return int.MaxValue;
+            }
+
+            throw new ArgumentException($"The type \"{type}\" is not a supported int type.");
+        }
+
+        public static Operand GetPredLogicalOp(
+            EmitterContext   context,
+            LogicalOperation logicalOp,
+            Operand          input,
+            Operand          pred)
+        {
+            switch (logicalOp)
+            {
+                case LogicalOperation.And:         return context.BitwiseAnd        (input, pred);
+                case LogicalOperation.Or:          return context.BitwiseOr         (input, pred);
+                case LogicalOperation.ExclusiveOr: return context.BitwiseExclusiveOr(input, pred);
+            }
+
+            return input;
+        }
+
+        public static void SetZnFlags(EmitterContext context, Operand dest, bool setCC, bool extended = false)
+        {
+            if (!setCC)
+            {
+                return;
+            }
+
+            if (extended)
+            {
+                // When the operation is extended, it means we are doing
+                // the operation on a long word with any number of bits,
+                // so we need to AND the zero flag from result with the
+                // previous result when extended is specified, to ensure
+                // we have ZF set only if all words are zero, and not just
+                // the last one.
+                Operand oldZF = GetZF(context);
+
+                Operand res = context.BitwiseAnd(context.ICompareEqual(dest, Const(0)), oldZF);
+
+                context.Copy(GetZF(context), res);
+            }
+            else
+            {
+                context.Copy(GetZF(context), context.ICompareEqual(dest, Const(0)));
+            }
+
+            context.Copy(GetNF(context), context.ICompareLess(dest, Const(0)));
+        }
+    }
+}
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