private static void EmitFrecps(AILEmitterCtx Context, int Index, bool Scalar)
{
AOpCodeSimdReg Op = (AOpCodeSimdReg)Context.CurrOp;
int SizeF = Op.Size & 1;
if (SizeF == 0)
{
Context.EmitLdc_R4(2);
}
else /* if (SizeF == 1) */
{
Context.EmitLdc_R8(2);
}
EmitVectorExtractF(Context, Op.Rn, Index, SizeF);
EmitVectorExtractF(Context, Op.Rm, Index, SizeF);
Context.Emit(OpCodes.Mul);
Context.Emit(OpCodes.Sub);
if (Scalar)
{
EmitVectorZeroAll(Context, Op.Rd);
}
EmitVectorInsertF(Context, Op.Rd, Index, SizeF);
}
private static void EmitFcmp(AILEmitterCtx Context, OpCode ILOp, int Index, bool Scalar)
{
AOpCodeSimd Op = (AOpCodeSimd)Context.CurrOp;
int SizeF = Op.Size & 1;
ulong SzMask = ulong.MaxValue >> (64 - (32 << SizeF));
EmitVectorExtractF(Context, Op.Rn, Index, SizeF);
if (Op is AOpCodeSimdReg BinOp)
{
EmitVectorExtractF(Context, BinOp.Rm, Index, SizeF);
}
else if (SizeF == 0)
{
Context.EmitLdc_R4(0);
}
else /* if (SizeF == 1) */
{
Context.EmitLdc_R8(0);
}
AILLabel LblTrue = new AILLabel();
AILLabel LblEnd = new AILLabel();
Context.Emit(ILOp, LblTrue);
if (Scalar)
{
EmitVectorZeroAll(Context, Op.Rd);
}
else
{
EmitVectorInsert(Context, Op.Rd, Index, SizeF + 2, 0);
}
Context.Emit(OpCodes.Br_S, LblEnd);
Context.MarkLabel(LblTrue);
if (Scalar)
{
EmitVectorInsert(Context, Op.Rd, Index, 3, (long)SzMask);
EmitVectorZeroUpper(Context, Op.Rd);
}
else
{
EmitVectorInsert(Context, Op.Rd, Index, SizeF + 2, (long)SzMask);
}
Context.MarkLabel(LblEnd);
}
private static void EmitLdcImmF(AILEmitterCtx Context, double ImmF, int Size)
{
if (Size == 0)
{
Context.EmitLdc_R4((float)ImmF);
}
else if (Size == 1)
{
Context.EmitLdc_R8(ImmF);
}
else
{
throw new ArgumentOutOfRangeException(nameof(Size));
}
}
private static void EmitI2fFBitsMul(AILEmitterCtx Context, int Size, int FBits)
{
if (FBits != 0)
{
if (Size == 0)
{
Context.EmitLdc_R4(1f / MathF.Pow(2, FBits));
}
else if (Size == 1)
{
Context.EmitLdc_R8(1 / Math.Pow(2, FBits));
}
else
{
throw new ArgumentOutOfRangeException(nameof(Size));
}
Context.Emit(OpCodes.Mul);
}
}
public static void Fcmp_S(AILEmitterCtx Context)
{
AOpCodeSimdReg Op = (AOpCodeSimdReg)Context.CurrOp;
bool CmpWithZero = !(Op is AOpCodeSimdFcond) ? Op.Bit3 : false;
//Handle NaN case.
//If any number is NaN, then NZCV = 0011.
if (CmpWithZero)
{
EmitNaNCheck(Context, Op.Rn);
}
else
{
EmitNaNCheck(Context, Op.Rn);
EmitNaNCheck(Context, Op.Rm);
Context.Emit(OpCodes.Or);
}
AILLabel LblNaN = new AILLabel();
AILLabel LblEnd = new AILLabel();
Context.Emit(OpCodes.Brtrue_S, LblNaN);
void EmitLoadOpers()
{
EmitVectorExtractF(Context, Op.Rn, 0, Op.Size);
if (CmpWithZero)
{
if (Op.Size == 0)
{
Context.EmitLdc_R4(0);
}
else /* if (SizeF == 1) */
{
Context.EmitLdc_R8(0);
}
}
else
{
EmitVectorExtractF(Context, Op.Rm, 0, Op.Size);
}
}
//Z = Rn == Rm
EmitLoadOpers();
Context.Emit(OpCodes.Ceq);
Context.Emit(OpCodes.Dup);
Context.EmitStflg((int)APState.ZBit);
//C = Rn >= Rm
EmitLoadOpers();
Context.Emit(OpCodes.Cgt);
Context.Emit(OpCodes.Or);
Context.EmitStflg((int)APState.CBit);
//N = Rn < Rm
EmitLoadOpers();
Context.Emit(OpCodes.Clt);
Context.EmitStflg((int)APState.NBit);
//V = 0
Context.EmitLdc_I4(0);
Context.EmitStflg((int)APState.VBit);
Context.Emit(OpCodes.Br_S, LblEnd);
Context.MarkLabel(LblNaN);
EmitSetNZCV(Context, 0b0011);
Context.MarkLabel(LblEnd);
}
