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#include "if.h"
#include "cache.h"
#include "controller.h"
#include "dram.h"
#include "instrDTO.h"
#include <catch2/catch_test_macros.hpp>
class IFPipeFixture
{
public:
IFPipeFixture()
{
Dram *d;
d = new Dram(this->m_delay);
// 0xC00 is a nop
p = {0xC000, 0xC001, 0xC002, 0xC003};
d->load(p);
this->c = new Cache(d, this->c_delay);
this->f = new IF(nullptr);
this->ct = new Controller(this->f, this->c, true);
}
~IFPipeFixture()
{
delete this->ct;
delete this->c;
};
/**
* Fetch a clean line not in cache.
*/
InstrDTO *fetch_through()
{
InstrDTO *r;
int i;
for (i = 0; i < this->m_delay + 1; ++i) {
r = this->ct->advance(OK);
// check response
CHECK(r == nullptr);
}
return this->fetch_cache();
}
/**
* Fetch a line in cache.
*/
InstrDTO *fetch_cache()
{
InstrDTO *r;
int i;
for (i = 0; i < this->c_delay; ++i) {
r = this->ct->advance(OK);
// check response
CHECK(r == nullptr);
}
r = this->ct->advance(OK);
// check response
CHECK(r != nullptr);
return r;
}
int m_delay = 3;
int c_delay = 1;
std::vector<signed int> p;
Cache *c;
IF *f;
Controller *ct;
};
TEST_CASE_METHOD(IFPipeFixture, "fetch returns single instuction", "[if_pipe]")
{
InstrDTO *i;
int expected_cycles;
expected_cycles = this->m_delay + this->c_delay + 2;
i = this->fetch_through();
CHECK(i->get_time_of(FETCH) == expected_cycles);
REQUIRE(i->get_instr_bits() == this->p[0]);
delete i;
}
TEST_CASE_METHOD(IFPipeFixture, "fetch returns two instuctions", "[if_pipe]")
{
InstrDTO *i;
int expected_cycles;
expected_cycles = this->m_delay + this->c_delay + 2;
i = this->fetch_through();
CHECK(i->get_time_of(FETCH) == expected_cycles);
REQUIRE(i->get_instr_bits() == this->p[0]);
delete i;
expected_cycles += this->c_delay + 1;
i = this->fetch_cache();
CHECK(i->get_time_of(FETCH) == expected_cycles);
REQUIRE(i->get_instr_bits() == this->p[1]);
delete i;
}
TEST_CASE_METHOD(IFPipeFixture, "fetch waits with old instruction",
"[if_pipe]")
{
InstrDTO *i;
int j, expected_cycles, fetch_cycles;
fetch_cycles = this->m_delay + this->c_delay + 2;
expected_cycles = this->m_delay + (this->c_delay * 2) + 1;
for (j = 0; j < this->m_delay + 1; ++j) {
i = this->ct->advance(BLOCKED);
// check response
CHECK(i == nullptr);
}
for (j = 0; j < this->c_delay; ++j) {
i = this->ct->advance(BLOCKED);
// check response
CHECK(i == nullptr);
}
for (j = 0; j < expected_cycles - fetch_cycles; ++j) {
i = this->ct->advance(BLOCKED);
// check response
CHECK(i != nullptr);
}
i = this->ct->advance(OK);
CHECK(i->get_time_of(FETCH) == expected_cycles);
REQUIRE(i->get_instr_bits() == this->p[0]);
delete i;
}
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