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Implement UQADD16, UQADD8, UQSUB16, UQSUB8, VQRDMULH, VSLI and VSWP Arm32 instructions (#7174)

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gdkchan 2024-08-08 17:07:24 -03:00 • committed by GitHub
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12 changed files with 445 additions and 13 deletions
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184
src/ARMeilleure/Instructions/InstEmitAlu32.cs
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@ -2,6 +2,8 @@ using ARMeilleure.Decoders;
using ARMeilleure.IntermediateRepresentation;
using ARMeilleure.State;
using ARMeilleure.Translation;
using System;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using static ARMeilleure.Instructions.InstEmitAluHelper;
using static ARMeilleure.Instructions.InstEmitHelper;
@ -558,6 +560,46 @@ namespace ARMeilleure.Instructions
EmitHsub8(context, unsigned: true);
}
public static void Uqadd16(ArmEmitterContext context)
{
OpCode32AluReg op = (OpCode32AluReg)context.CurrOp;
SetIntA32(context, op.Rd, EmitUnsigned16BitPair(context, GetIntA32(context, op.Rn), GetIntA32(context, op.Rm), (d, n, m) =>
{
EmitSaturateUqadd(context, d, context.Add(n, m), 16);
}));
}
public static void Uqadd8(ArmEmitterContext context)
{
OpCode32AluReg op = (OpCode32AluReg)context.CurrOp;
SetIntA32(context, op.Rd, EmitUnsigned8BitPair(context, GetIntA32(context, op.Rn), GetIntA32(context, op.Rm), (d, n, m) =>
{
EmitSaturateUqadd(context, d, context.Add(n, m), 8);
}));
}
public static void Uqsub16(ArmEmitterContext context)
{
OpCode32AluReg op = (OpCode32AluReg)context.CurrOp;
SetIntA32(context, op.Rd, EmitUnsigned16BitPair(context, GetIntA32(context, op.Rn), GetIntA32(context, op.Rm), (d, n, m) =>
{
EmitSaturateUqsub(context, d, context.Subtract(n, m), 16);
}));
}
public static void Uqsub8(ArmEmitterContext context)
{
OpCode32AluReg op = (OpCode32AluReg)context.CurrOp;
SetIntA32(context, op.Rd, EmitUnsigned8BitPair(context, GetIntA32(context, op.Rn), GetIntA32(context, op.Rm), (d, n, m) =>
{
EmitSaturateUqsub(context, d, context.Subtract(n, m), 8);
}));
}
public static void Usat(ArmEmitterContext context)
{
OpCode32Sat op = (OpCode32Sat)context.CurrOp;
@ -934,6 +976,148 @@ namespace ARMeilleure.Instructions
}
}
private static void EmitSaturateUqadd(ArmEmitterContext context, Operand result, Operand value, uint saturateTo)
{
Debug.Assert(saturateTo <= 32);
if (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;
}
// If the result is 0, the values are equal and we don't need saturation.
Operand lblNoSat = Label();
context.BranchIfFalse(lblNoSat, context.ShiftRightUI(value, Const((int)saturateTo)));
// Saturate.
context.Copy(result, Const(uint.MaxValue >> (32 - (int)saturateTo)));
Operand lblExit = Label();
context.Branch(lblExit);
context.MarkLabel(lblNoSat);
context.Copy(result, value);
context.MarkLabel(lblExit);
}
private static void EmitSaturateUqsub(ArmEmitterContext context, Operand result, Operand value, uint saturateTo)
{
Debug.Assert(saturateTo <= 32);
if (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;
}
// If the result is 0, the values are equal and we don't need saturation.
Operand lblNoSat = Label();
context.BranchIf(lblNoSat, value, Const(0), Comparison.GreaterOrEqual);
// Saturate.
// Assumes that the value can only underflow, since this is only used for unsigned subtraction.
context.Copy(result, Const(0));
Operand lblExit = Label();
context.Branch(lblExit);
context.MarkLabel(lblNoSat);
context.Copy(result, value);
context.MarkLabel(lblExit);
}
private static Operand EmitUnsigned16BitPair(ArmEmitterContext context, Operand rn, Operand rm, Action<Operand, Operand, Operand> elementAction)
{
Operand tempD = context.AllocateLocal(OperandType.I32);
Operand tempN = context.ZeroExtend16(OperandType.I32, rn);
Operand tempM = context.ZeroExtend16(OperandType.I32, rm);
elementAction(tempD, tempN, tempM);
Operand tempD2 = context.ZeroExtend16(OperandType.I32, tempD);
tempN = context.ShiftRightUI(rn, Const(16));
tempM = context.ShiftRightUI(rm, Const(16));
elementAction(tempD, tempN, tempM);
return context.BitwiseOr(tempD2, context.ShiftLeft(tempD, Const(16)));
}
private static Operand EmitSigned8BitPair(ArmEmitterContext context, Operand rn, Operand rm, Action<Operand, Operand, Operand> elementAction)
{
return Emit8BitPair(context, rn, rm, elementAction, unsigned: false);
}
private static Operand EmitUnsigned8BitPair(ArmEmitterContext context, Operand rn, Operand rm, Action<Operand, Operand, Operand> elementAction)
{
return Emit8BitPair(context, rn, rm, elementAction, unsigned: true);
}
private static Operand Emit8BitPair(ArmEmitterContext context, Operand rn, Operand rm, Action<Operand, Operand, Operand> elementAction, bool unsigned)
{
Operand tempD = context.AllocateLocal(OperandType.I32);
Operand result = default;
for (int b = 0; b < 4; b++)
{
Operand nByte = b != 0 ? context.ShiftRightUI(rn, Const(b * 8)) : rn;
Operand mByte = b != 0 ? context.ShiftRightUI(rm, Const(b * 8)) : rm;
if (unsigned)
{
nByte = context.ZeroExtend8(OperandType.I32, nByte);
mByte = context.ZeroExtend8(OperandType.I32, mByte);
}
else
{
nByte = context.SignExtend8(OperandType.I32, nByte);
mByte = context.SignExtend8(OperandType.I32, mByte);
}
elementAction(tempD, nByte, mByte);
if (b == 0)
{
result = context.ZeroExtend8(OperandType.I32, tempD);
}
else if (b < 3)
{
result = context.BitwiseOr(result, context.ShiftLeft(context.ZeroExtend8(OperandType.I32, tempD), Const(b * 8)));
}
else
{
result = context.BitwiseOr(result, context.ShiftLeft(tempD, Const(24)));
}
}
return result;
}
private static void EmitAluStore(ArmEmitterContext context, Operand value)
{
IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;