101 lines
3.8 KiB
C#
101 lines
3.8 KiB
C#
using ARMeilleure.Decoders;
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using ARMeilleure.IntermediateRepresentation;
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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.InstEmitSimdHelper32;
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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 partial class InstEmit32
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{
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public static void Vshl(ArmEmitterContext context)
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{
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OpCode32SimdShImm op = (OpCode32SimdShImm)context.CurrOp;
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EmitVectorUnaryOpZx32(context, (op1) => context.ShiftLeft(op1, Const(op.Shift)));
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}
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public static void Vshl_I(ArmEmitterContext context)
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{
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OpCode32SimdReg op = (OpCode32SimdReg)context.CurrOp;
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if (op.U)
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{
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EmitVectorBinaryOpZx32(context, (op1, op2) => EmitShlRegOp(context, op2, op1, op.Size, true));
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}
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else
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{
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EmitVectorBinaryOpSx32(context, (op1, op2) => EmitShlRegOp(context, op2, op1, op.Size, false));
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}
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}
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public static void Vshr(ArmEmitterContext context)
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{
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OpCode32SimdShImm op = (OpCode32SimdShImm)context.CurrOp;
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int shift = (8 << op.Size) - op.Shift; // Shr amount is flipped.
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int maxShift = (8 << op.Size) - 1;
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if (op.U)
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{
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EmitVectorUnaryOpZx32(context, (op1) => (shift > maxShift) ? Const(op1.Type, 0) : context.ShiftRightUI(op1, Const(shift)));
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}
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else
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{
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EmitVectorUnaryOpSx32(context, (op1) => context.ShiftRightSI(op1, Const(Math.Min(maxShift, shift))));
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}
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}
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public static void Vshrn(ArmEmitterContext context)
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{
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OpCode32SimdShImm op = (OpCode32SimdShImm)context.CurrOp;
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int shift = (8 << op.Size) - op.Shift; // Shr amount is flipped.
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EmitVectorUnaryNarrowOp32(context, (op1) => context.ShiftRightUI(op1, Const(shift)));
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}
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private static Operand EmitShlRegOp(ArmEmitterContext context, Operand op, Operand shiftLsB, int size, bool unsigned)
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{
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if (shiftLsB.Type == OperandType.I64)
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{
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shiftLsB = context.ConvertI64ToI32(shiftLsB);
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}
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shiftLsB = context.SignExtend8(OperandType.I32, shiftLsB);
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Debug.Assert((uint)size < 4u);
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Operand negShiftLsB = context.Negate(shiftLsB);
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Operand isPositive = context.ICompareGreaterOrEqual(shiftLsB, Const(0));
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Operand shl = context.ShiftLeft(op, shiftLsB);
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Operand shr = unsigned ? context.ShiftRightUI(op, negShiftLsB) : context.ShiftRightSI(op, negShiftLsB);
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Operand res = context.ConditionalSelect(isPositive, shl, shr);
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if (unsigned)
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{
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Operand isOutOfRange = context.BitwiseOr(
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context.ICompareGreaterOrEqual(shiftLsB, Const(8 << size)),
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context.ICompareGreaterOrEqual(negShiftLsB, Const(8 << size)));
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return context.ConditionalSelect(isOutOfRange, Const(op.Type, 0), res);
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}
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else
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{
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Operand isOutOfRange0 = context.ICompareGreaterOrEqual(shiftLsB, Const(8 << size));
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Operand isOutOfRangeN = context.ICompareGreaterOrEqual(negShiftLsB, Const(8 << size));
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// Also zero if shift is too negative, but value was positive.
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isOutOfRange0 = context.BitwiseOr(isOutOfRange0, context.BitwiseAnd(isOutOfRangeN, context.ICompareGreaterOrEqual(op, Const(op.Type, 0))));
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Operand min = (op.Type == OperandType.I64) ? Const(-1L) : Const(-1);
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return context.ConditionalSelect(isOutOfRange0, Const(op.Type, 0), context.ConditionalSelect(isOutOfRangeN, min, res));
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}
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}
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}
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}
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