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authorGabe Black <gblack@eecs.umich.edu>2006-12-16 07:35:56 -0500
committerGabe Black <gblack@eecs.umich.edu>2006-12-16 07:35:56 -0500
commitc6944e320cfa86d3f2ce628457aff4bc431e7189 (patch)
treec8752f8f6d8fbf92d2417c4fb958096303dfbcdc /src/cpu/o3
parent244506ae12d079e012ec40fe85b68f54d3fd91c6 (diff)
downloadgem5-c6944e320cfa86d3f2ce628457aff4bc431e7189.tar.xz
Add in capability to return to unblocking after a squash. This is needed because if you don't squash -all- the instructions, you need to keep clearing out whatever is left in the skid buffer.
--HG-- extra : convert_revision : 7308eda27f4366348cf5fce71ddfa4b217bc172d
Diffstat (limited to 'src/cpu/o3')
-rw-r--r--src/cpu/o3/rename.hh4
-rw-r--r--src/cpu/o3/rename_impl.hh44
2 files changed, 40 insertions, 8 deletions
diff --git a/src/cpu/o3/rename.hh b/src/cpu/o3/rename.hh
index 1ede6f355..6b4628f92 100644
--- a/src/cpu/o3/rename.hh
+++ b/src/cpu/o3/rename.hh
@@ -415,6 +415,10 @@ class DefaultRename
* after squashing. */
bool resumeSerialize;
+ /** Whether or not rename needs to resume clearing out the skidbuffer
+ * after squashing. */
+ bool resumeUnblocking;
+
/** The number of threads active in rename. */
unsigned numThreads;
diff --git a/src/cpu/o3/rename_impl.hh b/src/cpu/o3/rename_impl.hh
index 0c211b183..7a7234965 100644
--- a/src/cpu/o3/rename_impl.hh
+++ b/src/cpu/o3/rename_impl.hh
@@ -44,6 +44,7 @@ DefaultRename<Impl>::DefaultRename(Params *params)
renameWidth(params->renameWidth),
commitWidth(params->commitWidth),
resumeSerialize(false),
+ resumeUnblocking(false),
numThreads(params->numberOfThreads),
maxPhysicalRegs(params->numPhysIntRegs + params->numPhysFloatRegs)
{
@@ -405,6 +406,9 @@ DefaultRename<Impl>::squash(const InstSeqNum &squash_seq_num, unsigned tid)
}
slist_it++;
}
+ resumeUnblocking = (skidBuffer[tid].size() != 0);
+ DPRINTF(Rename, "Resume unblocking set to %s\n",
+ resumeUnblocking ? "true" : "false");
#else
skidBuffer[tid].clear();
#endif
@@ -496,6 +500,12 @@ DefaultRename<Impl>::rename(bool &status_change, unsigned tid)
block(tid);
toDecode->renameUnblock[tid] = false;
}
+ } else if (renameStatus[tid] == Unblocking) {
+ if (resumeUnblocking) {
+ block(tid);
+ resumeUnblocking = false;
+ toDecode->renameUnblock[tid] = false;
+ }
}
if (renameStatus[tid] == Running ||
@@ -761,7 +771,17 @@ DefaultRename<Impl>::skidInsert(unsigned tid)
}
if (skidBuffer[tid].size() > skidBufferMax)
+ {
+ typename InstQueue::iterator it;
+ warn("Skidbuffer contents:\n");
+ for(it = skidBuffer[tid].begin(); it != skidBuffer[tid].end(); it++)
+ {
+ warn("[tid:%u]: %s [sn:%i].\n", tid,
+ (*it)->staticInst->disassemble(inst->readPC()),
+ (*it)->seqNum);
+ }
panic("Skidbuffer Exceeded Max Size");
+ }
}
template <class Impl>
@@ -848,7 +868,10 @@ DefaultRename<Impl>::block(unsigned tid)
// Only signal backwards to block if the previous stages do not think
// rename is already blocked.
if (renameStatus[tid] != Blocked) {
- if (renameStatus[tid] != Unblocking) {
+ // If resumeUnblocking is set, we unblocked during the squash,
+ // but now we're have unblocking status. We need to tell earlier
+ // stages to block.
+ if (resumeUnblocking || renameStatus[tid] != Unblocking) {
toDecode->renameBlock[tid] = true;
toDecode->renameUnblock[tid] = false;
wroteToTimeBuffer = true;
@@ -1264,18 +1287,23 @@ DefaultRename<Impl>::checkSignalsAndUpdate(unsigned tid)
if (renameStatus[tid] == Squashing) {
// Switch status to running if rename isn't being told to block or
// squash this cycle.
- if (!resumeSerialize) {
- DPRINTF(Rename, "[tid:%u]: Done squashing, switching to running.\n",
- tid);
-
- renameStatus[tid] = Running;
- return false;
- } else {
+ if (resumeSerialize) {
DPRINTF(Rename, "[tid:%u]: Done squashing, switching to serialize.\n",
tid);
renameStatus[tid] = SerializeStall;
return true;
+ } else if (resumeUnblocking) {
+ DPRINTF(Rename, "[tid:%u]: Done squashing, switching to unblocking.\n",
+ tid);
+ renameStatus[tid] = Unblocking;
+ return true;
+ } else {
+ DPRINTF(Rename, "[tid:%u]: Done squashing, switching to running.\n",
+ tid);
+
+ renameStatus[tid] = Running;
+ return false;
}
}