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using Ryujinx.Graphics.Shader.IntermediateRepresentation;
using Ryujinx.Graphics.Shader.Translation;
using static Ryujinx.Graphics.Shader.IntermediateRepresentation.OperandHelper;
namespace Ryujinx.Graphics.Shader.Instructions
{
static class Lop3Expression
{
private enum TruthTable : byte
{
False = 0x00, // false
True = 0xff, // true
In = 0xf0, // a
And2 = 0xc0, // a & b
Or2 = 0xfc, // a | b
Xor2 = 0x3c, // a ^ b
And3 = 0x80, // a & b & c
Or3 = 0xfe, // a | b | c
XorAnd = 0x60, // a & (b ^ c)
XorOr = 0xf6, // a | (b ^ c)
OrAnd = 0xe0, // a & (b | c)
AndOr = 0xf8, // a | (b & c)
Onehot = 0x16, // (a & !b & !c) | (!a & b & !c) | (!a & !b & c) - Only one value is true.
Majority = 0xe8, // Popcount(a, b, c) >= 2
Gamble = 0x81, // (a & b & c) | (!a & !b & !c) - All on or all off
InverseGamble = 0x7e, // Inverse of Gamble
Dot = 0x1a, // a ^ (c | (a & b))
Mux = 0xca, // a ? b : c
AndXor = 0x78, // a ^ (b & c)
OrXor = 0x1e, // a ^ (b | c)
Xor3 = 0x96, // a ^ b ^ c
}
public static Operand GetFromTruthTable(EmitterContext context, Operand srcA, Operand srcB, Operand srcC, int imm)
{
for (int i = 0; i < 0x40; i++)
{
TruthTable currImm = (TruthTable)imm;
Operand x = srcA;
Operand y = srcB;
Operand z = srcC;
if ((i & 0x01) != 0)
{
(x, y) = (y, x);
currImm = PermuteTable(currImm, 7, 6, 3, 2, 5, 4, 1, 0);
}
if ((i & 0x02) != 0)
{
(x, z) = (z, x);
currImm = PermuteTable(currImm, 7, 3, 5, 1, 6, 2, 4, 0);
}
if ((i & 0x04) != 0)
{
(y, z) = (z, y);
currImm = PermuteTable(currImm, 7, 5, 6, 4, 3, 1, 2, 0);
}
if ((i & 0x08) != 0)
{
x = context.BitwiseNot(x);
currImm = PermuteTable(currImm, 3, 2, 1, 0, 7, 6, 5, 4);
}
if ((i & 0x10) != 0)
{
y = context.BitwiseNot(y);
currImm = PermuteTable(currImm, 5, 4, 7, 6, 1, 0, 3, 2);
}
if ((i & 0x20) != 0)
{
z = context.BitwiseNot(z);
currImm = PermuteTable(currImm, 6, 7, 4, 5, 2, 3, 0, 1);
}
Operand result = GetExpr(currImm, context, x, y, z);
if (result != null)
{
return result;
}
Operand notResult = GetExpr((TruthTable)((~(int)currImm) & 0xff), context, x, y, z);
if (notResult != null)
{
return context.BitwiseNot(notResult);
}
}
return null;
}
private static Operand GetExpr(TruthTable imm, EmitterContext context, Operand x, Operand y, Operand z)
{
return imm switch
{
TruthTable.False => Const(0),
TruthTable.True => Const(-1),
TruthTable.In => x,
TruthTable.And2 => context.BitwiseAnd(x, y),
TruthTable.Or2 => context.BitwiseOr(x, y),
TruthTable.Xor2 => context.BitwiseExclusiveOr(x, y),
TruthTable.And3 => context.BitwiseAnd(x, context.BitwiseAnd(y, z)),
TruthTable.Or3 => context.BitwiseOr(x, context.BitwiseOr(y, z)),
TruthTable.XorAnd => context.BitwiseAnd(x, context.BitwiseExclusiveOr(y, z)),
TruthTable.XorOr => context.BitwiseOr(x, context.BitwiseExclusiveOr(y, z)),
TruthTable.OrAnd => context.BitwiseAnd(x, context.BitwiseOr(y, z)),
TruthTable.AndOr => context.BitwiseOr(x, context.BitwiseAnd(y, z)),
TruthTable.Onehot => context.BitwiseExclusiveOr(context.BitwiseOr(x, y), context.BitwiseOr(z, context.BitwiseAnd(x, y))),
TruthTable.Majority => context.BitwiseAnd(context.BitwiseOr(x, y), context.BitwiseOr(z, context.BitwiseAnd(x, y))),
TruthTable.InverseGamble => context.BitwiseOr(context.BitwiseExclusiveOr(x, y), context.BitwiseExclusiveOr(x, z)),
TruthTable.Dot => context.BitwiseAnd(context.BitwiseExclusiveOr(x, z), context.BitwiseOr(context.BitwiseNot(y), z)),
TruthTable.Mux => context.BitwiseOr(context.BitwiseAnd(x, y), context.BitwiseAnd(context.BitwiseNot(x), z)),
TruthTable.AndXor => context.BitwiseExclusiveOr(x, context.BitwiseAnd(y, z)),
TruthTable.OrXor => context.BitwiseExclusiveOr(x, context.BitwiseOr(y, z)),
TruthTable.Xor3 => context.BitwiseExclusiveOr(x, context.BitwiseExclusiveOr(y, z)),
_ => null
};
}
private static TruthTable PermuteTable(TruthTable imm, int bit7, int bit6, int bit5, int bit4, int bit3, int bit2, int bit1, int bit0)
{
int result = 0;
result |= (((int)imm >> 0) & 1) << bit0;
result |= (((int)imm >> 1) & 1) << bit1;
result |= (((int)imm >> 2) & 1) << bit2;
result |= (((int)imm >> 3) & 1) << bit3;
result |= (((int)imm >> 4) & 1) << bit4;
result |= (((int)imm >> 5) & 1) << bit5;
result |= (((int)imm >> 6) & 1) << bit6;
result |= (((int)imm >> 7) & 1) << bit7;
return (TruthTable)result;
}
}
}
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