private static void EmitSat16(ArmEmitterContext context, int intMin, int intMax)
{
OpCode32Sat16 op = (OpCode32Sat16)context.CurrOp;
void SetD(int part, Operand value)
{
if (part == 0)
{
SetIntA32(context, op.Rd, context.ZeroExtend16(OperandType.I32, value));
}
else
{
SetIntA32(context, op.Rd, context.BitwiseOr(GetIntA32(context, op.Rd), context.ShiftLeft(value, Const(16))));
}
}
Operand n = GetIntA32(context, op.Rn);
Operand nLow = context.SignExtend16(OperandType.I32, n);
Operand nHigh = context.ShiftRightSI(n, Const(16));
for (int part = 0; part < 2; part++)
{
Operand nPart = part == 0 ? nLow : nHigh;
Operand lblCheckLtIntMin = Label();
Operand lblNoSat = Label();
Operand lblEnd = Label();
context.BranchIfFalse(lblCheckLtIntMin, context.ICompareGreater(nPart, Const(intMax)));
SetFlag(context, PState.QFlag, Const(1));
SetD(part, Const(intMax));
context.Branch(lblEnd);
context.MarkLabel(lblCheckLtIntMin);
context.BranchIfFalse(lblNoSat, context.ICompareLess(nPart, Const(intMin)));
SetFlag(context, PState.QFlag, Const(1));
SetD(part, Const(intMin));
context.Branch(lblEnd);
context.MarkLabel(lblNoSat);
SetD(part, nPart);
context.MarkLabel(lblEnd);
}
}
public static void Usat16(ArmEmitterContext context)
{
OpCode32Sat16 op = (OpCode32Sat16)context.CurrOp;
EmitSat16(context, 0, (1 << op.SatImm) - 1);
}
