cpu-o3: fix data pkt initialization for split load

When a split load hits a memory region where IPRs are mapped, the
Writebackevent which is scheduled for that was carrying a data packet
that was not correctly initialized which caused an assertion to fire
when the Writeback event is processed.

Change-Id: I71a4e291f0086f7468d7e8124a0a8f098088972f
Signed-off-by: Matthias Hille <matthiashille8@gmail.com>
Reported-by: Matthias Hille <matthiashille8@gmail.com>
Reviewed-on: https://gem5-review.googlesource.com/4620
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

diff --git a/src/cpu/o3/lsq_unit.hh b/src/cpu/o3/lsq_unit.hh
index 9d885302ba25a0664cda3c658f8b3265d1fea440..b8e8955712bc2352f5a476ca3db45091ef786834 100644 (file)
--- a/src/cpu/o3/lsq_unit.hh
+++ b/src/cpu/o3/lsq_unit.hh
@@ -610,8 +610,8 @@ LSQUnit<Impl>::read(Request *req, Request *sreqLow, Request *sreqHigh,
         Cycles delay(0);
         PacketPtr data_pkt = new Packet(req, MemCmd::ReadReq);
 
+        data_pkt->dataStatic(load_inst->memData);
         if (!TheISA::HasUnalignedMemAcc || !sreqLow) {
-            data_pkt->dataStatic(load_inst->memData);
             delay = TheISA::handleIprRead(thread, data_pkt);
         } else {
             assert(sreqLow->isMmappedIpr() && sreqHigh->isMmappedIpr());