diff options
Diffstat (limited to 'src/sim/if.cc')
| -rw-r--r-- | src/sim/if.cc | 33 |
1 files changed, 25 insertions, 8 deletions
diff --git a/src/sim/if.cc b/src/sim/if.cc index deed8e1..7d3291b 100644 --- a/src/sim/if.cc +++ b/src/sim/if.cc @@ -2,18 +2,35 @@ #include "accessor.h" #include "instrDTO.h" #include "response.h" +#include "stage.h" -Response IF::advance(InstrDTO &i) +IF::IF(Stage *stage) : Stage(stage) { this->id = FETCH; } + +Response IF::advance(InstrDTO &next_instr, Response p) +{ + this->advance_helper(); + if (this->status == OK && p == OK) { + // mutual consent + ++this->pc; + this->curr_instr->set_time_of(this->id, this->clock_cycle); + next_instr = *this->curr_instr; + curr_instr = nullptr; + } + return this->status; +} + +void IF::advance_helper() { Response r; signed int bits; - r = this->storage->read_word(this->id, this->pc, bits); - if (r == OK) { - ++this->pc; - i.set_if_cycle(this->clock_cycle); - i.set_instr_bits(bits); + if (this->curr_instr == nullptr) { + r = this->storage->read_word(this->id, this->pc, bits); + if (r == OK) { + this->status = r; + this->curr_instr = std::make_unique<InstrDTO>(); + this->curr_instr->set_instr_bits(bits); + } else + this->status = STALLED; } - - return r; } |