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Implement Arm32 VSHLL and QADD16 instructions (#7301)

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gdkchan 2024-09-12 18:22:30 -03:00 • committed by GitHub
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113
src/ARMeilleure/Instructions/InstEmitAlu32.cs
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@ -292,6 +292,16 @@ namespace ARMeilleure.Instructions
EmitAluStore(context, res);
}
public static void Qadd16(ArmEmitterContext context)
{
OpCode32AluReg op = (OpCode32AluReg)context.CurrOp;
SetIntA32(context, op.Rd, EmitSigned16BitPair(context, GetIntA32(context, op.Rn), GetIntA32(context, op.Rm), (d, n, m) =>
{
EmitSaturateRange(context, d, context.Add(n, m), 16, unsigned: false, setQ: false);
}));
}
public static void Rbit(ArmEmitterContext context)
{
Operand m = GetAluM(context);
@ -976,6 +986,94 @@ namespace ARMeilleure.Instructions
}
}
private static void EmitSaturateRange(ArmEmitterContext context, Operand result, Operand value, uint saturateTo, bool unsigned, bool setQ = true)
{
Debug.Assert(saturateTo <= 32);
Debug.Assert(!unsigned || saturateTo < 32);
if (!unsigned && saturateTo == 32)
{
// No saturation possible for this case.
context.Copy(result, value);
return;
}
else if (saturateTo == 0)
{
// Result is always zero if we saturate 0 bits.
context.Copy(result, Const(0));
return;
}
Operand satValue;
if (unsigned)
{
// Negative values always saturate (to zero).
// So we must always ignore the sign bit when masking, so that the truncated value will differ from the original one.
satValue = context.BitwiseAnd(value, Const((int)(uint.MaxValue >> (32 - (int)saturateTo))));
}
else
{
satValue = context.ShiftLeft(value, Const(32 - (int)saturateTo));
satValue = context.ShiftRightSI(satValue, Const(32 - (int)saturateTo));
}
// If the result is 0, the values are equal and we don't need saturation.
Operand lblNoSat = Label();
context.BranchIfFalse(lblNoSat, context.Subtract(value, satValue));
// Saturate and set Q flag.
if (unsigned)
{
if (saturateTo == 31)
{
// Only saturation case possible when going from 32 bits signed to 32 or 31 bits unsigned
// is when the signed input is negative, as all positive values are representable on a 31 bits range.
satValue = Const(0);
}
else
{
satValue = context.ShiftRightSI(value, Const(31));
satValue = context.BitwiseNot(satValue);
satValue = context.ShiftRightUI(satValue, Const(32 - (int)saturateTo));
}
}
else
{
if (saturateTo == 1)
{
satValue = context.ShiftRightSI(value, Const(31));
}
else
{
satValue = Const(uint.MaxValue >> (33 - (int)saturateTo));
satValue = context.BitwiseExclusiveOr(satValue, context.ShiftRightSI(value, Const(31)));
}
}
if (setQ)
{
SetFlag(context, PState.QFlag, Const(1));
}
context.Copy(result, satValue);
Operand lblExit = Label();
context.Branch(lblExit);
context.MarkLabel(lblNoSat);
context.Copy(result, value);
context.MarkLabel(lblExit);
}
private static void EmitSaturateUqadd(ArmEmitterContext context, Operand result, Operand value, uint saturateTo)
{
Debug.Assert(saturateTo <= 32);
@ -1053,6 +1151,21 @@ namespace ARMeilleure.Instructions
context.MarkLabel(lblExit);
}
private static Operand EmitSigned16BitPair(ArmEmitterContext context, Operand rn, Operand rm, Action<Operand, Operand, Operand> elementAction)
{
Operand tempD = context.AllocateLocal(OperandType.I32);
Operand tempN = context.SignExtend16(OperandType.I32, rn);
Operand tempM = context.SignExtend16(OperandType.I32, rm);
elementAction(tempD, tempN, tempM);
Operand tempD2 = context.ZeroExtend16(OperandType.I32, tempD);
tempN = context.ShiftRightSI(rn, Const(16));
tempM = context.ShiftRightSI(rm, Const(16));
elementAction(tempD, tempN, tempM);
return context.BitwiseOr(tempD2, context.ShiftLeft(tempD, Const(16)));
}
private static Operand EmitUnsigned16BitPair(ArmEmitterContext context, Operand rn, Operand rm, Action<Operand, Operand, Operand> elementAction)
{
Operand tempD = context.AllocateLocal(OperandType.I32);