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expression.cpp
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expression.cpp
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//
// Created by erthax on 15.01.2021.
//
#include "instruction_generators.h"
//______________________________Expression_________________________________
//___________________________ValueExpression_______________________________
void ValueExpression::generateExpressionValue(Register *resultRegister) {
Command::loadValueToRegister(resultRegister, this->value);
}
//____________________________AddExpression________________________________
void AddExpression::generateExpressionValue(Register *resultRegister) {
Register *valueRegister = memory->getFreeRegister();
Command::loadValueToRegister(resultRegister, this->value1);
Command::loadValueToRegister(valueRegister, this->value2);
code->add(resultRegister->getName(), valueRegister->getName());
}
//____________________________SubExpression________________________________
void SubExpression::generateExpressionValue(Register *resultRegister) {
Register *valueRegister = memory->getFreeRegister();
Command::loadValueToRegister(resultRegister, this->value1);
Command::loadValueToRegister(valueRegister, this->value2);
code->sub(resultRegister->getName(), valueRegister->getName());
}
//____________________________MulExpression________________________________
void MulExpression::generateExpressionValue(Register *resultRegister) {
Register *multiplierRegister = memory->getFreeRegister();
Register *multiplicandRegister = memory->getFreeRegister();
code->reset(resultRegister->getName());
Command::loadValueToRegister(multiplierRegister, this->value1);
Command::loadValueToRegister(multiplicandRegister, this->value2);
//we can add jumps to finish if either of them is zero
code->jzero(multiplicandRegister->getName(), 9);
uint jumpAdress = code->getInstructionCount();
//if multiplicand is odd we add multiplier to result
code->jodd(multiplicandRegister->getName(), 4); // here we check if multi is odd, if it it we jump
// here we now that multi is not odd
code->shl(multiplierRegister->getName());
code->shr(multiplicandRegister->getName());
code->jump(-3);
//here we jumped if multi was odd
code->add(resultRegister->getName(), multiplierRegister->getName());
code->shl(multiplierRegister->getName());
code->shr(multiplicandRegister->getName());
// if multiplicand is not zero we jump to start
code->jump(-8);
}
//____________________________DivExpression________________________________
void DivExpression::generateExpressionValue(Register *resultRegister) {
// TODO optymalization for division by powers of 2 and 1.
Register *dividentRegister = memory->getFreeRegister(); // we will have reminder here
Register *divisorRegister = memory->getFreeRegister();
Register *multiplyRegister = memory->getFreeRegister();
Command::loadValueToRegister(dividentRegister, this->value1);
Command::loadValueToRegister(divisorRegister, this->value2);
Register *ifConditionRegister = memory->getFreeRegister();
Register *whileConditionRegister = memory->getFreeRegister();
code->reset(resultRegister->getName());
//if divisor = 0 finish (result is also 0 so its good)
code->jzero(divisorRegister->getName(), 24);
// else do division
// preparing registers
code->reset(multiplyRegister->getName());
code->inc(multiplyRegister->getName());
code->reset(ifConditionRegister->getName());
//while(dividend - divisor > 0) czyli jezeli wynik = 0 top przerywamy
//{
// code->shl(divisorRegister->getName());
// code->shl(multiplyRegister->getName());
//}
code->reset(whileConditionRegister->getName());
code->add(whileConditionRegister->getName(), dividentRegister->getName());
code->sub(whileConditionRegister->getName(), divisorRegister->getName());
code->jzero(whileConditionRegister->getName(), 4);
code->shl(divisorRegister->getName());
code->shl(multiplyRegister->getName());
code->jump(-6);
//do {
// if( 0 >= divisor - divident)
// {
// divident = divident - divisor; FIRST PART
// result = result + multiple;
// divisor = divisor >> 1; // Divide by two.
// multiple = multiple >> 1;
// } else {
// divisor = divisor >> 1; // Divide by two. SECOND PART
// multiple = multiple >> 1;
// }
//} while(multiple != 0);
code->reset(ifConditionRegister->getName());
code->add(ifConditionRegister->getName(), divisorRegister->getName());
code->sub(ifConditionRegister->getName(), dividentRegister->getName());
code->jzero(ifConditionRegister->getName(), 4);
// if it is not 0
code->shr(divisorRegister->getName()); //second part
code->shr(multiplyRegister->getName());
code->jump(5);
// else
code->sub(dividentRegister->getName(), divisorRegister->getName());
code->add(resultRegister->getName(), multiplyRegister->getName());
code->shr(divisorRegister->getName()); // first part
code->shr(multiplyRegister->getName());
code->jzero(multiplyRegister->getName(), 2);
code->jump(-12);
}
//____________________________ModExpression________________________________
void ModExpression::generateExpressionValue(Register *dividentRegister) { // this register has our reminder
// TODO optymalization for division by powers of 2 and 1.
Register *resultRegister = memory->getFreeRegister(); // this is register with relulst of divide
Register *divisorRegister = memory->getFreeRegister();
Register *multiplyRegister = memory->getFreeRegister();
Command::loadValueToRegister(dividentRegister, this->value1);
Command::loadValueToRegister(divisorRegister, this->value2);
Register *ifConditionRegister = memory->getFreeRegister();
Register *whileConditionRegister = memory->getFreeRegister();
code->reset(resultRegister->getName());
//if divisor = 0 finish (result is also 0 so its good)
code->jzero(divisorRegister->getName(), 24);
// else do division
// preparing registers
code->reset(multiplyRegister->getName());
code->inc(multiplyRegister->getName());
code->reset(ifConditionRegister->getName());
//while(dividend - divisor > 0) czyli jezeli wynik = 0 top przerywamy
//{
// code->shl(divisorRegister->getName());
// code->shl(multiplyRegister->getName());
//}
code->reset(whileConditionRegister->getName());
code->add(whileConditionRegister->getName(), dividentRegister->getName());
code->sub(whileConditionRegister->getName(), divisorRegister->getName());
code->jzero(whileConditionRegister->getName(), 4);
code->shl(divisorRegister->getName());
code->shl(multiplyRegister->getName());
code->jump(-6);
//do {
// if( 0 >= divisor - divident)
// {
// divident = divident - divisor; FIRST PART
// result = result + multiple;
// divisor = divisor >> 1; // Divide by two.
// multiple = multiple >> 1;
// } else {
// divisor = divisor >> 1; // Divide by two. SECOND PART
// multiple = multiple >> 1;
// }
//} while(multiple != 0);
code->reset(ifConditionRegister->getName());
code->add(ifConditionRegister->getName(), divisorRegister->getName());
code->sub(ifConditionRegister->getName(), dividentRegister->getName());
code->jzero(ifConditionRegister->getName(), 4);
// if it is not 0
code->shr(divisorRegister->getName()); //second part
code->shr(multiplyRegister->getName());
code->jump(5);
// else
code->sub(dividentRegister->getName(), divisorRegister->getName());
code->add(resultRegister->getName(), multiplyRegister->getName());
code->shr(divisorRegister->getName()); // first part
code->shr(multiplyRegister->getName());
code->jzero(multiplyRegister->getName(), 3);
code->jump(-12);
code->reset(dividentRegister->getName()); // we jump here if divider is 0, we have to set this (our result) to 0
}