public static void Vext(ArmEmitterContext context)
{
OpCode32SimdExt op = (OpCode32SimdExt)context.CurrOp;
int elems = op.GetBytesCount();
int byteOff = op.Immediate;
Operand res = GetVecA32(op.Qd);
for (int index = 0; index < elems; index++)
{
Operand extract;
if (byteOff >= elems)
{
extract = EmitVectorExtractZx32(context, op.Qm, op.Im + (byteOff - elems), op.Size);
}
else
{
extract = EmitVectorExtractZx32(context, op.Qn, op.In + byteOff, op.Size);
}
byteOff++;
res = EmitVectorInsert(context, res, extract, op.Id + index, op.Size);
}
context.Copy(GetVecA32(op.Qd), res);
}
public static void Vext(ArmEmitterContext context)
{
OpCode32SimdExt op = (OpCode32SimdExt)context.CurrOp;
int elems = op.GetBytesCount();
int byteOff = op.Immediate;
if (Optimizations.UseSsse3)
{
EmitVectorBinaryOpSimd32(context, (n, m) =>
{
// Writing low to high of d: start <imm> into n, overlap into m.
// Then rotate n down by <imm>, m up by (elems)-imm.
// Then OR them together for the result.
(long nMaskHigh, long nMaskLow) = MaskHelperByteSequence(0, elems - byteOff, byteOff);
(long mMaskHigh, long mMaskLow) = MaskHelperByteSequence(elems - byteOff, byteOff, 0);
Operand nMask, mMask;
if (!op.Q)
{
// Do the same operation to the bytes in the top doubleword too, as our target could be in either.
nMaskHigh = nMaskLow + 0x0808080808080808L;
mMaskHigh = mMaskLow + 0x0808080808080808L;
}
nMask = X86GetElements(context, nMaskHigh, nMaskLow);
mMask = X86GetElements(context, mMaskHigh, mMaskLow);
Operand nPart = context.AddIntrinsic(Intrinsic.X86Pshufb, n, nMask);
Operand mPart = context.AddIntrinsic(Intrinsic.X86Pshufb, m, mMask);
return(context.AddIntrinsic(Intrinsic.X86Por, nPart, mPart));
});
}
else
{
Operand res = GetVecA32(op.Qd);
for (int index = 0; index < elems; index++)
{
Operand extract;
if (byteOff >= elems)
{
extract = EmitVectorExtractZx32(context, op.Qm, op.Im + (byteOff - elems), op.Size);
}
else
{
extract = EmitVectorExtractZx32(context, op.Qn, op.In + byteOff, op.Size);
}
byteOff++;
res = EmitVectorInsert(context, res, extract, op.Id + index, op.Size);
}
context.Copy(GetVecA32(op.Qd), res);
}
}
