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613 lines
20 KiB
C#
613 lines
20 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 System.Diagnostics;
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using static ARMeilleure.Instructions.InstEmitHelper;
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using static ARMeilleure.IntermediateRepresentation.Operand.Factory;
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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 bool ShouldSetFlags(ArmEmitterContext context)
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{
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IOpCode32HasSetFlags op = (IOpCode32HasSetFlags)context.CurrOp;
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if (op.SetFlags == null)
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{
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return !context.IsInIfThenBlock;
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}
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return op.SetFlags.Value;
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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 EmitReverseBits32Op(ArmEmitterContext context, Operand op)
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{
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Debug.Assert(op.Type == OperandType.I32);
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Operand val = context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(op, Const(0xaaaaaaaau)), Const(1)),
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context.ShiftLeft(context.BitwiseAnd(op, Const(0x55555555u)), Const(1)));
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val = context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(val, Const(0xccccccccu)), Const(2)),
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context.ShiftLeft(context.BitwiseAnd(val, Const(0x33333333u)), Const(2)));
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val = context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(val, Const(0xf0f0f0f0u)), Const(4)),
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context.ShiftLeft(context.BitwiseAnd(val, Const(0x0f0f0f0fu)), Const(4)));
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val = context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(val, Const(0xff00ff00u)), Const(8)),
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context.ShiftLeft(context.BitwiseAnd(val, Const(0x00ff00ffu)), Const(8)));
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return context.BitwiseOr(context.ShiftRightUI(val, Const(16)), context.ShiftLeft(val, Const(16)));
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}
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public static Operand EmitReverseBytes16_64Op(ArmEmitterContext context, Operand op)
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{
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Debug.Assert(op.Type == OperandType.I64);
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return context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(op, Const(0xff00ff00ff00ff00ul)), Const(8)),
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context.ShiftLeft(context.BitwiseAnd(op, Const(0x00ff00ff00ff00fful)), Const(8)));
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}
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public static Operand EmitReverseBytes16_32Op(ArmEmitterContext context, Operand op)
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{
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Debug.Assert(op.Type == OperandType.I32);
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Operand val = EmitReverseBytes16_64Op(context, context.ZeroExtend32(OperandType.I64, op));
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return context.ConvertI64ToI32(val);
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}
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private static void EmitAluWritePc(ArmEmitterContext context, Operand value)
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{
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Debug.Assert(value.Type == OperandType.I32);
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if (((OpCode32)context.CurrOp).IsThumb)
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{
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bool isReturn = IsA32Return(context);
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if (!isReturn)
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{
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context.StoreToContext();
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}
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InstEmitFlowHelper.EmitVirtualJump(context, value, isReturn);
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}
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else
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{
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EmitBxWritePc(context, value);
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}
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}
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public static void EmitGenericAluStoreA32(ArmEmitterContext context, int rd, bool setFlags, Operand value)
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{
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Debug.Assert(value.Type == OperandType.I32);
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if (rd == RegisterAlias.Aarch32Pc && setFlags)
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{
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if (setFlags)
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{
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// TODO: Load SPSR etc.
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EmitBxWritePc(context, value);
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}
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else
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{
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EmitAluWritePc(context, value);
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}
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}
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else
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{
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SetIntA32(context, rd, value);
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}
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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 IOpCode32AluImm op:
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{
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if (ShouldSetFlags(context) && op.IsRotated && setCarry)
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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 IOpCode32AluImm16 op: return Const(op.Immediate);
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case IOpCode32AluRsImm op: return GetMShiftedByImmediate(context, op, setCarry);
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case IOpCode32AluRsReg op: return GetMShiftedByReg(context, op, setCarry);
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case IOpCode32AluReg op: return GetIntA32(context, op.Rm);
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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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public static Operand GetMShiftedByImmediate(ArmEmitterContext context, IOpCode32AluRsImm op, bool setCarry)
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{
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Operand m = GetIntA32(context, op.Rm);
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int shift = op.Immediate;
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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 &= ShouldSetFlags(context);
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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.Immediate != 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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public static int DecodeImmShift(ShiftType shiftType, int shift)
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{
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if (shift == 0)
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{
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switch (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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return shift;
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}
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public static Operand GetMShiftedByReg(ArmEmitterContext context, IOpCode32AluRsReg op, bool setCarry)
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{
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Operand m = GetIntA32(context, op.Rm);
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Operand s = context.ZeroExtend8(OperandType.I32, GetIntA32(context, op.Rs));
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Operand shiftIsZero = context.ICompareEqual(s, Const(0));
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Operand zeroResult = m;
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Operand shiftResult = m;
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setCarry &= ShouldSetFlags(context);
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switch (op.ShiftType)
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{
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case ShiftType.Lsl: shiftResult = EmitLslC(context, m, setCarry, s, shiftIsZero); break;
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case ShiftType.Lsr: shiftResult = EmitLsrC(context, m, setCarry, s, shiftIsZero); break;
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case ShiftType.Asr: shiftResult = EmitAsrC(context, m, setCarry, s, shiftIsZero); break;
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case ShiftType.Ror: shiftResult = EmitRorC(context, m, setCarry, s, shiftIsZero); break;
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}
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return context.ConditionalSelect(shiftIsZero, zeroResult, shiftResult);
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}
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public static void EmitIfHelper(ArmEmitterContext context, Operand boolValue, Action action, bool expected = true)
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{
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Debug.Assert(boolValue.Type == OperandType.I32);
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Operand endLabel = Label();
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if (expected)
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{
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context.BranchIfFalse(endLabel, boolValue);
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}
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else
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{
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context.BranchIfTrue(endLabel, boolValue);
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}
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action();
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context.MarkLabel(endLabel);
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}
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public static Operand EmitLslC(ArmEmitterContext context, Operand m, bool setCarry, Operand shift, Operand shiftIsZero)
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{
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Debug.Assert(m.Type == OperandType.I32 && shift.Type == OperandType.I32 && shiftIsZero.Type == OperandType.I32);
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Operand shiftLarge = context.ICompareGreaterOrEqual(shift, Const(32));
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Operand result = context.ShiftLeft(m, shift);
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if (setCarry)
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{
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EmitIfHelper(context, shiftIsZero, () =>
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{
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Operand cOut = context.ShiftRightUI(m, context.Subtract(Const(32), shift));
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cOut = context.BitwiseAnd(cOut, Const(1));
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cOut = context.ConditionalSelect(context.ICompareGreater(shift, Const(32)), Const(0), cOut);
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SetFlag(context, PState.CFlag, cOut);
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}, false);
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}
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return context.ConditionalSelect(shiftLarge, Const(0), result);
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}
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public static Operand GetLslC(ArmEmitterContext context, Operand m, bool setCarry, int shift)
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{
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Debug.Assert(m.Type == OperandType.I32);
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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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public static Operand EmitLsrC(ArmEmitterContext context, Operand m, bool setCarry, Operand shift, Operand shiftIsZero)
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{
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Debug.Assert(m.Type == OperandType.I32 && shift.Type == OperandType.I32 && shiftIsZero.Type == OperandType.I32);
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Operand shiftLarge = context.ICompareGreaterOrEqual(shift, Const(32));
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Operand result = context.ShiftRightUI(m, shift);
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if (setCarry)
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{
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EmitIfHelper(context, shiftIsZero, () =>
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{
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Operand cOut = context.ShiftRightUI(m, context.Subtract(shift, Const(1)));
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cOut = context.BitwiseAnd(cOut, Const(1));
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cOut = context.ConditionalSelect(context.ICompareGreater(shift, Const(32)), Const(0), cOut);
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SetFlag(context, PState.CFlag, cOut);
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}, false);
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}
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return context.ConditionalSelect(shiftLarge, Const(0), result);
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}
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public static Operand GetLsrC(ArmEmitterContext context, Operand m, bool setCarry, int shift)
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{
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Debug.Assert(m.Type == OperandType.I32);
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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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public static Operand EmitAsrC(ArmEmitterContext context, Operand m, bool setCarry, Operand shift, Operand shiftIsZero)
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{
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Debug.Assert(m.Type == OperandType.I32 && shift.Type == OperandType.I32 && shiftIsZero.Type == OperandType.I32);
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Operand l32Result;
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Operand ge32Result;
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Operand less32 = context.ICompareLess(shift, Const(32));
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ge32Result = context.ShiftRightSI(m, Const(31));
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if (setCarry)
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{
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EmitIfHelper(context, context.BitwiseOr(less32, shiftIsZero), () =>
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{
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SetCarryMLsb(context, ge32Result);
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}, false);
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}
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l32Result = context.ShiftRightSI(m, shift);
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if (setCarry)
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{
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EmitIfHelper(context, context.BitwiseAnd(less32, context.BitwiseNot(shiftIsZero)), () =>
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{
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Operand cOut = context.ShiftRightUI(m, context.Subtract(shift, Const(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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return context.ConditionalSelect(less32, l32Result, ge32Result);
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}
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public static Operand GetAsrC(ArmEmitterContext context, Operand m, bool setCarry, int shift)
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{
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Debug.Assert(m.Type == OperandType.I32);
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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);
|
|
}
|
|
|
|
return m;
|
|
}
|
|
else
|
|
{
|
|
if (setCarry)
|
|
{
|
|
SetCarryMShrOut(context, m, shift);
|
|
}
|
|
|
|
return context.ShiftRightSI(m, Const(shift));
|
|
}
|
|
}
|
|
|
|
public static Operand EmitRorC(ArmEmitterContext context, Operand m, bool setCarry, Operand shift, Operand shiftIsZero)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32 && shift.Type == OperandType.I32 && shiftIsZero.Type == OperandType.I32);
|
|
|
|
shift = context.BitwiseAnd(shift, Const(0x1f));
|
|
m = context.RotateRight(m, shift);
|
|
|
|
if (setCarry)
|
|
{
|
|
EmitIfHelper(context, shiftIsZero, () =>
|
|
{
|
|
SetCarryMMsb(context, m);
|
|
}, false);
|
|
}
|
|
|
|
return m;
|
|
}
|
|
|
|
public static Operand GetRorC(ArmEmitterContext context, Operand m, bool setCarry, int shift)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32);
|
|
|
|
shift &= 0x1f;
|
|
|
|
m = context.RotateRight(m, Const(shift));
|
|
|
|
if (setCarry)
|
|
{
|
|
SetCarryMMsb(context, m);
|
|
}
|
|
|
|
return m;
|
|
}
|
|
|
|
public static Operand GetRrxC(ArmEmitterContext context, Operand m, bool setCarry)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32);
|
|
|
|
// Rotate right by 1 with carry.
|
|
Operand cIn = context.Copy(GetFlag(PState.CFlag));
|
|
|
|
if (setCarry)
|
|
{
|
|
SetCarryMLsb(context, m);
|
|
}
|
|
|
|
m = context.ShiftRightUI(m, Const(1));
|
|
|
|
m = context.BitwiseOr(m, context.ShiftLeft(cIn, Const(31)));
|
|
|
|
return m;
|
|
}
|
|
|
|
private static void SetCarryMLsb(ArmEmitterContext context, Operand m)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32);
|
|
|
|
SetFlag(context, PState.CFlag, context.BitwiseAnd(m, Const(1)));
|
|
}
|
|
|
|
private static void SetCarryMMsb(ArmEmitterContext context, Operand m)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32);
|
|
|
|
SetFlag(context, PState.CFlag, context.ShiftRightUI(m, Const(31)));
|
|
}
|
|
|
|
private static void SetCarryMShrOut(ArmEmitterContext context, Operand m, int shift)
|
|
{
|
|
Debug.Assert(m.Type == OperandType.I32);
|
|
|
|
Operand cOut = context.ShiftRightUI(m, Const(shift - 1));
|
|
|
|
cOut = context.BitwiseAnd(cOut, Const(1));
|
|
|
|
SetFlag(context, PState.CFlag, cOut);
|
|
}
|
|
}
|
|
}
|