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using ARMeilleure.Decoders;
using ARMeilleure.IntermediateRepresentation;
using ARMeilleure.Translation;
using System;
using static ARMeilleure.Instructions.InstEmitHelper;
namespace ARMeilleure.Instructions
{
static partial class InstEmit
{
public static void Madd(ArmEmitterContext context) => EmitMul(context, isAdd: true);
public static void Msub(ArmEmitterContext context) => EmitMul(context, isAdd: false);
private static void EmitMul(ArmEmitterContext context, bool isAdd)
{
OpCodeMul op = (OpCodeMul)context.CurrOp;
Operand a = GetIntOrZR(context, op.Ra);
Operand n = GetIntOrZR(context, op.Rn);
Operand m = GetIntOrZR(context, op.Rm);
Operand res = context.Multiply(n, m);
res = isAdd ? context.Add(a, res) : context.Subtract(a, res);
SetIntOrZR(context, op.Rd, res);
}
public static void Smaddl(ArmEmitterContext context) => EmitMull(context, MullFlags.SignedAdd);
public static void Smsubl(ArmEmitterContext context) => EmitMull(context, MullFlags.SignedSubtract);
public static void Umaddl(ArmEmitterContext context) => EmitMull(context, MullFlags.Add);
public static void Umsubl(ArmEmitterContext context) => EmitMull(context, MullFlags.Subtract);
[Flags]
private enum MullFlags
{
Subtract = 0,
Add = 1 << 0,
Signed = 1 << 1,
SignedAdd = Signed | Add,
SignedSubtract = Signed | Subtract
}
private static void EmitMull(ArmEmitterContext context, MullFlags flags)
{
OpCodeMul op = (OpCodeMul)context.CurrOp;
Operand GetExtendedRegister32(int index)
{
Operand value = GetIntOrZR(context, index);
if ((flags & MullFlags.Signed) != 0)
{
return context.SignExtend32(value.Type, value);
}
else
{
return context.ZeroExtend32(value.Type, value);
}
}
Operand a = GetIntOrZR(context, op.Ra);
Operand n = GetExtendedRegister32(op.Rn);
Operand m = GetExtendedRegister32(op.Rm);
Operand res = context.Multiply(n, m);
res = (flags & MullFlags.Add) != 0 ? context.Add(a, res) : context.Subtract(a, res);
SetIntOrZR(context, op.Rd, res);
}
public static void Smulh(ArmEmitterContext context)
{
OpCodeMul op = (OpCodeMul)context.CurrOp;
Operand n = GetIntOrZR(context, op.Rn);
Operand m = GetIntOrZR(context, op.Rm);
Operand d = context.Multiply64HighSI(n, m);
SetIntOrZR(context, op.Rd, d);
}
public static void Umulh(ArmEmitterContext context)
{
OpCodeMul op = (OpCodeMul)context.CurrOp;
Operand n = GetIntOrZR(context, op.Rn);
Operand m = GetIntOrZR(context, op.Rm);
Operand d = context.Multiply64HighUI(n, m);
SetIntOrZR(context, op.Rd, d);
}
}
}
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