diff options
Diffstat (limited to 'src/cpu/o3/lsq_unit.hh')
| -rw-r--r-- | src/cpu/o3/lsq_unit.hh | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/src/cpu/o3/lsq_unit.hh b/src/cpu/o3/lsq_unit.hh index b8e895571..a2813b3dc 100644 --- a/src/cpu/o3/lsq_unit.hh +++ b/src/cpu/o3/lsq_unit.hh @@ -1,5 +1,5 @@ /* - * Copyright (c) 2012-2014 ARM Limited + * Copyright (c) 2012-2014,2017 ARM Limited * All rights reserved * * The license below extends only to copyright in the software and shall @@ -650,10 +650,14 @@ LSQUnit<Impl>::read(Request *req, Request *sreqLow, Request *sreqHigh, store_size = storeQueue[store_idx].size; - if (store_size == 0) - continue; - else if (storeQueue[store_idx].inst->strictlyOrdered()) + if (!store_size || storeQueue[store_idx].inst->strictlyOrdered() || + (storeQueue[store_idx].req && + storeQueue[store_idx].req->isCacheMaintenance())) { + // Cache maintenance instructions go down via the store + // path but they carry no data and they shouldn't be + // considered for forwarding continue; + } assert(storeQueue[store_idx].inst->effAddrValid()); @@ -894,9 +898,9 @@ LSQUnit<Impl>::write(Request *req, Request *sreqLow, Request *sreqHigh, storeQueue[store_idx].sreqHigh = sreqHigh; unsigned size = req->getSize(); storeQueue[store_idx].size = size; - storeQueue[store_idx].isAllZeros = req->getFlags() & Request::CACHE_BLOCK_ZERO; - assert(size <= sizeof(storeQueue[store_idx].data) || - (req->getFlags() & Request::CACHE_BLOCK_ZERO)); + bool store_no_data = req->getFlags() & Request::STORE_NO_DATA; + storeQueue[store_idx].isAllZeros = store_no_data; + assert(size <= sizeof(storeQueue[store_idx].data) || store_no_data); // Split stores can only occur in ISAs with unaligned memory accesses. If // a store request has been split, sreqLow and sreqHigh will be non-null. @@ -904,7 +908,8 @@ LSQUnit<Impl>::write(Request *req, Request *sreqLow, Request *sreqHigh, storeQueue[store_idx].isSplit = true; } - if (!(req->getFlags() & Request::CACHE_BLOCK_ZERO)) + if (!(req->getFlags() & Request::CACHE_BLOCK_ZERO) && \ + !req->isCacheMaintenance()) memcpy(storeQueue[store_idx].data, data, size); // This function only writes the data to the store queue, so no fault |