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// 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 "if.h"
#include "instrDTO.h"
#include "response.h"
#include "stage.h"
InstrDTO *IF::advance(Response p)
{
InstrDTO *r = nullptr;
this->advance_helper();
if (this->curr_instr != nullptr && p == READY) {
// don't increment PC if the PC was just set by wb
if (this->curr_instr->is_squashed != 1)
++this->pc;
r = new InstrDTO(*this->curr_instr);
delete curr_instr;
curr_instr = nullptr;
}
return r;
}
void IF::advance_helper()
{
Response r;
int i;
signed int bits;
if (this->curr_instr == nullptr && (this->is_pipelined || this->is_empty)) {
i = this->storage->read_word(this, this->pc, bits);
r = i ? OK : STALLED;
if (r == OK) {
this->curr_instr = new InstrDTO();
this->curr_instr->slot_A = bits;
this->curr_instr->slot_B = this->pc;
this->curr_instr->is_squashed = 0;
this->curr_instr->checked_out = -1;
this->curr_instr->mnemonic = ADD;
this->is_empty = false;
}
}
}
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