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LOADoperation.cs
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LOADoperation.cs
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// ------------------------------------------------------------------------------------------------------------------------
// File name: LOADoperation.cs
// Project name: ISA
// Project description: Decoder for our awesome Detached-Toe 16-bit RISC ISA.
// ------------------------------------------------------------------------------------------------------------------------
// Creation Date: 03/31/2021
// ------------------------------------------------------------------------------------------------------------------------
namespace ISA_Decoder_16Bit {
/// <summary>
/// this one operand operation that loads indirectly from a register into another register
/// </summary>
class LOADoperation: Operation {
string verb = "Load"; // The main verb used for the message
int operandOneEndBit = 11; // The end bit of operand one
int operandOneStartBit = 8; // The starting bit of operand one
int operandOneValue; // The value of operand one
string operandOneMeaning; // The meaning of operand one
int operandTwoEndBit = 7; // The end bit of operand two
int operandTwoStartBit = 4; // The start bit of operand two
int operandTwoValue; // The value of operand two
string operandTwoMeaning; // The meaning of operand two
/// <summary>
/// default constructor
/// </summary>
public LOADoperation() {
}
/// <summary>
/// Decodes the input bits. This calls all the other functions.
/// </summary>
/// <param name="inputBits">a bit stream of the instruction</param>
/// <returns>a text translation of the instruction</returns>
public override string DecodeOperation(int inputBits) {
// Decode Immediate
// Decode Operand One
DecodeFirstOperand(inputBits);
// Decode Operand Two
DecodeSecondOperand(inputBits);
// Get readable text
return GetHumanText();
}
/// <summary>
/// Decode the first operand of this instruction by masking it and
/// 1) Determining its value
/// 2) Assigning it a textual meaning. (FIX THIS)
/// </summary>
/// <param name="inputBits">instruction bits</param>
private void DecodeFirstOperand(int inputBits) {
operandOneValue = BitUtilities.MaskInput(inputBits, operandOneStartBit, operandOneEndBit);
if (operandOneValue < 0 || operandOneValue > 15) {
operandTwoMeaning = $"OP1: Ya messed* up";
}
else {
operandOneMeaning = $"r{operandOneValue}";
}
}
/// <summary>
/// Decode the second operand of this instruction by maskign it and
/// 1)deteriming its value
/// 2)assigning it a textual meaning.
/// </summary>
/// <param name="inputBits"></param>
private void DecodeSecondOperand(int inputBits) {
operandTwoValue = BitUtilities.MaskInput(inputBits, operandTwoStartBit, operandTwoEndBit);
if (operandTwoValue < 0 || operandTwoValue > 15) { //used to check if valid register
operandTwoMeaning = $"OP2: Ya messed* up";
}
operandTwoMeaning = $"r{operandTwoValue}";
}
/// <summary>
/// This badboy looks through ALL our available fields and constructs an English sentence.
/// </summary>
private string GetHumanText() {
return $"{verb} the value pointed to by {operandTwoMeaning} into {operandOneMeaning}";
}
}
}