ChocolArm64/Instructions/InstEmitCsel.cs

59 lines
1.7 KiB
C#
Raw Permalink Normal View History

using ChocolArm64.Decoders;
using ChocolArm64.IntermediateRepresentation;
using ChocolArm64.Translation;
using System.Reflection.Emit;
namespace ChocolArm64.Instructions
{
static partial class InstEmit
{
private enum CselOperation
{
None,
Increment,
Invert,
Negate
}
public static void Csel(ILEmitterCtx context) => EmitCsel(context, CselOperation.None);
public static void Csinc(ILEmitterCtx context) => EmitCsel(context, CselOperation.Increment);
public static void Csinv(ILEmitterCtx context) => EmitCsel(context, CselOperation.Invert);
public static void Csneg(ILEmitterCtx context) => EmitCsel(context, CselOperation.Negate);
private static void EmitCsel(ILEmitterCtx context, CselOperation cselOp)
{
OpCodeCsel64 op = (OpCodeCsel64)context.CurrOp;
ILLabel lblTrue = new ILLabel();
ILLabel lblEnd = new ILLabel();
context.EmitCondBranch(lblTrue, op.Cond);
context.EmitLdintzr(op.Rm);
if (cselOp == CselOperation.Increment)
{
context.EmitLdc_I(1);
context.Emit(OpCodes.Add);
}
else if (cselOp == CselOperation.Invert)
{
context.Emit(OpCodes.Not);
}
else if (cselOp == CselOperation.Negate)
{
context.Emit(OpCodes.Neg);
}
context.Emit(OpCodes.Br_S, lblEnd);
context.MarkLabel(lblTrue);
context.EmitLdintzr(op.Rn);
context.MarkLabel(lblEnd);
context.EmitStintzr(op.Rd);
}
}
}