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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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