1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
// Simulator for the RISC-V[ECTOR] mini-ISA
// Copyright (C) 2025 Siddarth Suresh
// Copyright (C) 2025 bdunahu
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
#include "wb.h"
#include "instrDTO.h"
#include "response.h"
#include "instr.h"
#include "stage.h"
#include <algorithm>
#include <array>
void WB::advance_helper()
{
if (this->curr_instr->mnemonic != NOP) {
if (this->curr_instr->checked_out > 0)
this->write_handler();
else if (this->should_jump())
this->jump_handler();
}
this->status = OK;
}
void WB::write_handler()
{
signed int reg;
if (this->checked_out.size() < 1)
throw std::runtime_error("instruction tried to pop a register out of "
"an empty queue during writeback.");
if (this->curr_instr->mnemonic == POP) {
// POP performs a second register write
reg = this->checked_out.front();
this->checked_out.pop_front();
this->store_register<signed int>(
reg, this->curr_instr->operands.integer.slot_three);
}
this->checked_out.pop_front();
reg = this->curr_instr->checked_out;
if(this->curr_instr->type != SI_INT) {
if(this->curr_instr->mnemonic != STOREV && this->curr_instr->mnemonic != LOADV) {
this->store_register<std::array<signed int, V_R_LIMIT>>(reg, this->curr_instr->operands.vector.slot_one);
} else {
this->store_register<std::array<signed int, V_R_LIMIT>>(reg, this->curr_instr->operands.i_vector.vector_register);
}
} else{
this->store_register<signed int>(reg, this->curr_instr->operands.integer.slot_one);
}
}
void WB::jump_handler()
{
if (this->curr_instr->operands.integer.slot_one > 0) {
if (this->curr_instr->mnemonic == JAL)
this->gprs[1] = this->curr_instr->slot_B + 1;
;
this->pc = this->curr_instr->operands.integer.slot_one;
this->checked_out = {};
this->next->squash();
}
}
// TODO clean this up...
bool WB::should_jump()
{
vector<Mnemonic> Js = {JMP, JRL, JAL, BEQ, BGT, BUF, BOF, PUSH, POP, RET};
if (find(Js.begin(), Js.end(), this->curr_instr->mnemonic) != Js.end())
return true;
else
return false;
}
|
