diff options
Diffstat (limited to 'src/cpu/inorder/reg_dep_map.cc')
| -rw-r--r-- | src/cpu/inorder/reg_dep_map.cc | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/src/cpu/inorder/reg_dep_map.cc b/src/cpu/inorder/reg_dep_map.cc index 7fac0a905..cd1c3450c 100644 --- a/src/cpu/inorder/reg_dep_map.cc +++ b/src/cpu/inorder/reg_dep_map.cc @@ -161,7 +161,7 @@ RegDepMap::canRead(unsigned idx, DynInstPtr inst) } ThePipeline::DynInstPtr -RegDepMap::canForward(unsigned reg_idx, unsigned src_idx, DynInstPtr inst) +RegDepMap::canForward(unsigned reg_idx, DynInstPtr inst) { std::list<DynInstPtr>::iterator list_it = regMap[reg_idx].begin(); std::list<DynInstPtr>::iterator list_end = regMap[reg_idx].end(); @@ -176,13 +176,23 @@ RegDepMap::canForward(unsigned reg_idx, unsigned src_idx, DynInstPtr inst) } if (forward_inst) { + int dest_reg_idx = forward_inst->getDestIdxNum(reg_idx); + assert(dest_reg_idx != -1); + if (forward_inst->isExecuted() && - forward_inst->readResultTime(src_idx) < curTick) { + forward_inst->readResultTime(dest_reg_idx) < curTick) { return forward_inst; } else { - DPRINTF(RegDepMap, "[sn:%i] Can't get value through forwarding, " - " [sn:%i] has not been executed yet.\n", - inst->seqNum, forward_inst->seqNum); + if (!forward_inst->isExecuted()) { + DPRINTF(RegDepMap, "[sn:%i] Can't get value through forwarding, " + " [sn:%i] has not been executed yet.\n", + inst->seqNum, forward_inst->seqNum); + } else if (forward_inst->readResultTime(dest_reg_idx) >= curTick) { + DPRINTF(RegDepMap, "[sn:%i] Can't get value through forwarding, " + " [sn:%i] executed on tick:%i.\n", + inst->seqNum, forward_inst->seqNum, forward_inst->readResultTime(dest_reg_idx)); + } + return NULL; } } else { |