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8c85bdf2ed
* cpu-misc_opt * B = ~b * ;
351 lines
11 KiB
C#
351 lines
11 KiB
C#
using ARMeilleure.Decoders;
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using ARMeilleure.IntermediateRepresentation;
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using ARMeilleure.State;
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using ARMeilleure.Translation;
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using System;
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using static ARMeilleure.Instructions.InstEmitHelper;
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using static ARMeilleure.IntermediateRepresentation.OperandHelper;
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namespace ARMeilleure.Instructions
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{
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static class InstEmitAluHelper
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{
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public static void EmitNZFlagsCheck(ArmEmitterContext context, Operand d)
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{
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SetFlag(context, PState.NFlag, context.ICompareLess (d, Const(d.Type, 0)));
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SetFlag(context, PState.ZFlag, context.ICompareEqual(d, Const(d.Type, 0)));
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}
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public static void EmitAdcsCCheck(ArmEmitterContext context, Operand n, Operand d)
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{
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// C = (Rd == Rn && CIn) || Rd < Rn
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Operand cIn = GetFlag(PState.CFlag);
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Operand cOut = context.BitwiseAnd(context.ICompareEqual(d, n), cIn);
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cOut = context.BitwiseOr(cOut, context.ICompareLessUI(d, n));
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SetFlag(context, PState.CFlag, cOut);
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}
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public static void EmitAddsCCheck(ArmEmitterContext context, Operand n, Operand d)
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{
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// C = Rd < Rn
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SetFlag(context, PState.CFlag, context.ICompareLessUI(d, n));
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}
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public static void EmitAddsVCheck(ArmEmitterContext context, Operand n, Operand m, Operand d)
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{
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// V = (Rd ^ Rn) & ~(Rn ^ Rm) < 0
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Operand vOut = context.BitwiseExclusiveOr(d, n);
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vOut = context.BitwiseAnd(vOut, context.BitwiseNot(context.BitwiseExclusiveOr(n, m)));
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vOut = context.ICompareLess(vOut, Const(vOut.Type, 0));
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SetFlag(context, PState.VFlag, vOut);
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}
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public static void EmitSbcsCCheck(ArmEmitterContext context, Operand n, Operand m)
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{
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// C = (Rn == Rm && CIn) || Rn > Rm
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Operand cIn = GetFlag(PState.CFlag);
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Operand cOut = context.BitwiseAnd(context.ICompareEqual(n, m), cIn);
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cOut = context.BitwiseOr(cOut, context.ICompareGreaterUI(n, m));
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SetFlag(context, PState.CFlag, cOut);
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}
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public static void EmitSubsCCheck(ArmEmitterContext context, Operand n, Operand m)
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{
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// C = Rn >= Rm
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SetFlag(context, PState.CFlag, context.ICompareGreaterOrEqualUI(n, m));
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}
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public static void EmitSubsVCheck(ArmEmitterContext context, Operand n, Operand m, Operand d)
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{
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// V = (Rd ^ Rn) & (Rn ^ Rm) < 0
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Operand vOut = context.BitwiseExclusiveOr(d, n);
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vOut = context.BitwiseAnd(vOut, context.BitwiseExclusiveOr(n, m));
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vOut = context.ICompareLess(vOut, Const(vOut.Type, 0));
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SetFlag(context, PState.VFlag, vOut);
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}
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public static Operand GetAluN(ArmEmitterContext context)
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{
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if (context.CurrOp is IOpCodeAlu op)
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{
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if (op.DataOp == DataOp.Logical || op is IOpCodeAluRs)
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{
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return GetIntOrZR(context, op.Rn);
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}
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else
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{
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return GetIntOrSP(context, op.Rn);
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}
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}
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else if (context.CurrOp is IOpCode32Alu op32)
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{
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return GetIntA32(context, op32.Rn);
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}
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else
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{
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throw InvalidOpCodeType(context.CurrOp);
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}
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}
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public static Operand GetAluM(ArmEmitterContext context, bool setCarry = true)
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{
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switch (context.CurrOp)
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{
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// ARM32.
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case OpCode32AluImm op:
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{
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if (op.SetFlags && op.IsRotated)
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{
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SetFlag(context, PState.CFlag, Const((uint)op.Immediate >> 31));
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}
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return Const(op.Immediate);
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}
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case OpCode32AluRsImm op: return GetMShiftedByImmediate(context, op, setCarry);
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case OpCodeT16AluImm8 op: return Const(op.Immediate);
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// ARM64.
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case IOpCodeAluImm op:
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{
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if (op.GetOperandType() == OperandType.I32)
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{
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return Const((int)op.Immediate);
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}
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else
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{
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return Const(op.Immediate);
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}
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}
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case IOpCodeAluRs op:
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{
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Operand value = GetIntOrZR(context, op.Rm);
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switch (op.ShiftType)
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{
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case ShiftType.Lsl: value = context.ShiftLeft (value, Const(op.Shift)); break;
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case ShiftType.Lsr: value = context.ShiftRightUI(value, Const(op.Shift)); break;
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case ShiftType.Asr: value = context.ShiftRightSI(value, Const(op.Shift)); break;
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case ShiftType.Ror: value = context.RotateRight (value, Const(op.Shift)); break;
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}
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return value;
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}
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case IOpCodeAluRx op:
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{
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Operand value = GetExtendedM(context, op.Rm, op.IntType);
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value = context.ShiftLeft(value, Const(op.Shift));
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return value;
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}
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default: throw InvalidOpCodeType(context.CurrOp);
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}
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}
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private static Exception InvalidOpCodeType(OpCode opCode)
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{
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return new InvalidOperationException($"Invalid OpCode type \"{opCode?.GetType().Name ?? "null"}\".");
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}
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// ARM32 helpers.
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private static Operand GetMShiftedByImmediate(ArmEmitterContext context, OpCode32AluRsImm op, bool setCarry)
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{
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Operand m = GetIntA32(context, op.Rm);
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int shift = op.Imm;
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if (shift == 0)
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{
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switch (op.ShiftType)
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{
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case ShiftType.Lsr: shift = 32; break;
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case ShiftType.Asr: shift = 32; break;
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case ShiftType.Ror: shift = 1; break;
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}
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}
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if (shift != 0)
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{
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setCarry &= op.SetFlags;
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switch (op.ShiftType)
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{
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case ShiftType.Lsl: m = GetLslC(context, m, setCarry, shift); break;
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case ShiftType.Lsr: m = GetLsrC(context, m, setCarry, shift); break;
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case ShiftType.Asr: m = GetAsrC(context, m, setCarry, shift); break;
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case ShiftType.Ror:
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if (op.Imm != 0)
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{
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m = GetRorC(context, m, setCarry, shift);
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}
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else
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{
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m = GetRrxC(context, m, setCarry);
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}
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break;
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}
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}
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return m;
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}
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private static Operand GetLslC(ArmEmitterContext context, Operand m, bool setCarry, int shift)
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{
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if ((uint)shift > 32)
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{
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return GetShiftByMoreThan32(context, setCarry);
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}
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else if (shift == 32)
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{
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if (setCarry)
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{
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SetCarryMLsb(context, m);
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}
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return Const(0);
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}
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else
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{
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if (setCarry)
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{
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Operand cOut = context.ShiftRightUI(m, Const(32 - shift));
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cOut = context.BitwiseAnd(cOut, Const(1));
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SetFlag(context, PState.CFlag, cOut);
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}
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return context.ShiftLeft(m, Const(shift));
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}
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}
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private static Operand GetLsrC(ArmEmitterContext context, Operand m, bool setCarry, int shift)
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{
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if ((uint)shift > 32)
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{
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return GetShiftByMoreThan32(context, setCarry);
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}
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else if (shift == 32)
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{
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if (setCarry)
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{
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SetCarryMMsb(context, m);
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}
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return Const(0);
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}
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else
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{
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if (setCarry)
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{
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SetCarryMShrOut(context, m, shift);
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}
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return context.ShiftRightUI(m, Const(shift));
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}
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}
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private static Operand GetShiftByMoreThan32(ArmEmitterContext context, bool setCarry)
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{
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if (setCarry)
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{
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SetFlag(context, PState.CFlag, Const(0));
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}
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return Const(0);
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}
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private static Operand GetAsrC(ArmEmitterContext context, Operand m, bool setCarry, int shift)
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{
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if ((uint)shift >= 32)
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{
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m = context.ShiftRightSI(m, Const(31));
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if (setCarry)
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{
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SetCarryMLsb(context, m);
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}
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return m;
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}
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else
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{
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if (setCarry)
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{
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SetCarryMShrOut(context, m, shift);
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}
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return context.ShiftRightSI(m, Const(shift));
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}
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}
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private static Operand GetRorC(ArmEmitterContext context, Operand m, bool setCarry, int shift)
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{
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shift &= 0x1f;
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m = context.RotateRight(m, Const(shift));
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if (setCarry)
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{
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SetCarryMMsb(context, m);
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}
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return m;
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}
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private static Operand GetRrxC(ArmEmitterContext context, Operand m, bool setCarry)
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{
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// Rotate right by 1 with carry.
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Operand cIn = context.Copy(GetFlag(PState.CFlag));
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if (setCarry)
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{
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SetCarryMLsb(context, m);
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}
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m = context.ShiftRightUI(m, Const(1));
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m = context.BitwiseOr(m, context.ShiftLeft(cIn, Const(31)));
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return m;
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}
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private static void SetCarryMLsb(ArmEmitterContext context, Operand m)
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{
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SetFlag(context, PState.CFlag, context.BitwiseAnd(m, Const(1)));
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}
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private static void SetCarryMMsb(ArmEmitterContext context, Operand m)
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{
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SetFlag(context, PState.CFlag, context.ShiftRightUI(m, Const(31)));
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}
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private static void SetCarryMShrOut(ArmEmitterContext context, Operand m, int shift)
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{
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Operand cOut = context.ShiftRightUI(m, Const(shift - 1));
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cOut = context.BitwiseAnd(cOut, Const(1));
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SetFlag(context, PState.CFlag, cOut);
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}
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}
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}
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