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Add SSAT, SSAT16, USAT and USAT16 ARM32 instructions (#954)

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* Implement SMULWB, SMULWT, SMLAWB, SMLAWT, and add tests for some multiply instructions

* Improve test descriptions

* Rename SMULH to SMUL__

* Add SSAT, SSAT16, USAT and USAT16 ARM32 instructions

* Fix new tests

* Replace AND 0xFFFF with 16-bits zero extension (more efficient)
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gdkchan 2020-02-29 17:51:55 -03:00 • committed by GitHub
parent b8ee5b15ab
commit fb0939f9b6
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12 changed files with 666 additions and 195 deletions
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137
ARMeilleure/Instructions/InstEmitAlu32.cs
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@ -389,6 +389,20 @@ namespace ARMeilleure.Instructions
EmitDiv(context, false);
}
public static void Ssat(ArmEmitterContext context)
{
OpCode32Sat op = (OpCode32Sat)context.CurrOp;
EmitSat(context, -(1 << op.SatImm), (1 << op.SatImm) - 1);
}
public static void Ssat16(ArmEmitterContext context)
{
OpCode32Sat16 op = (OpCode32Sat16)context.CurrOp;
EmitSat16(context, -(1 << op.SatImm), (1 << op.SatImm) - 1);
}
public static void Sub(ArmEmitterContext context)
{
IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
@ -460,6 +474,20 @@ namespace ARMeilleure.Instructions
EmitDiv(context, true);
}
public static void Usat(ArmEmitterContext context)
{
OpCode32Sat op = (OpCode32Sat)context.CurrOp;
EmitSat(context, 0, op.SatImm == 32 ? (int)(~0) : (1 << op.SatImm) - 1);
}
public static void Usat16(ArmEmitterContext context)
{
OpCode32Sat16 op = (OpCode32Sat16)context.CurrOp;
EmitSat16(context, 0, (1 << op.SatImm) - 1);
}
public static void Uxtb(ArmEmitterContext context)
{
EmitSignExtend(context, false, 8);
@ -553,7 +581,7 @@ namespace ARMeilleure.Instructions
lowAdd = context.ZeroExtend16(OperandType.I32, n);
highAdd = context.ZeroExtend16(OperandType.I32, context.ShiftRightUI(n, Const(16)));
}
low16 = context.Add(low16, lowAdd);
high16 = context.Add(high16, highAdd);
}
@ -615,9 +643,116 @@ namespace ARMeilleure.Instructions
context.MarkLabel(lblEnd);
}
private static void EmitSat(ArmEmitterContext context, int intMin, int intMax)
{
OpCode32Sat op = (OpCode32Sat)context.CurrOp;
Operand n = GetIntA32(context, op.Rn);
int shift = DecodeImmShift(op.ShiftType, op.Imm5);
switch (op.ShiftType)
{
case ShiftType.Lsl:
if (shift == 32)
{
n = Const(0);
}
else
{
n = context.ShiftLeft(n, Const(shift));
}
break;
case ShiftType.Asr:
if (shift == 32)
{
n = context.ShiftRightSI(n, Const(31));
}
else
{
n = context.ShiftRightSI(n, Const(shift));
}
break;
}
Operand lblCheckLtIntMin = Label();
Operand lblNoSat = Label();
Operand lblEnd = Label();
context.BranchIfFalse(lblCheckLtIntMin, context.ICompareGreater(n, Const(intMax)));
SetFlag(context, PState.QFlag, Const(1));
SetIntA32(context, op.Rd, Const(intMax));
context.Branch(lblEnd);
context.MarkLabel(lblCheckLtIntMin);
context.BranchIfFalse(lblNoSat, context.ICompareLess(n, Const(intMin)));
SetFlag(context, PState.QFlag, Const(1));
SetIntA32(context, op.Rd, Const(intMin));
context.Branch(lblEnd);
context.MarkLabel(lblNoSat);
SetIntA32(context, op.Rd, n);
context.MarkLabel(lblEnd);
}
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);
}
}
private static void EmitAluStore(ArmEmitterContext context, Operand value)
{
IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
EmitGenericAluStoreA32(context, op.Rd, op.SetFlags, value);
}
}