rjx-mirror/ChocolArm64/Instruction/AInstEmitCsel.cs

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2018-02-04 23:08:20 +00:00
using ChocolArm64.Decoder;
using ChocolArm64.Translation;
using System.Reflection.Emit;
namespace ChocolArm64.Instruction
{
static partial class AInstEmit
{
private enum CselOperation
{
None,
Increment,
Invert,
Negate
}
public static void Csel(AILEmitterCtx Context) => EmitCsel(Context, CselOperation.None);
public static void Csinc(AILEmitterCtx Context) => EmitCsel(Context, CselOperation.Increment);
public static void Csinv(AILEmitterCtx Context) => EmitCsel(Context, CselOperation.Invert);
public static void Csneg(AILEmitterCtx Context) => EmitCsel(Context, CselOperation.Negate);
private static void EmitCsel(AILEmitterCtx Context, CselOperation CselOp)
{
AOpCodeCsel Op = (AOpCodeCsel)Context.CurrOp;
AILLabel LblTrue = new AILLabel();
AILLabel LblEnd = new AILLabel();
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);
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}
}
}