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authorBinh Pham <binhpham@cs.rutgers.edu>2014-06-21 10:26:55 -0700
committerBinh Pham <binhpham@cs.rutgers.edu>2014-06-21 10:26:55 -0700
commitb72c8798682d307adfe9c1c2a77ac5a6d6240c15 (patch)
tree0c3c1ad306709bd44d07f9eaca3dac63809f5409
parent0782d92286ded450b7e615fefbd5d6d5e738c8cd (diff)
downloadgem5-b72c8798682d307adfe9c1c2a77ac5a6d6240c15.tar.xz
o3: make dispatch LSQ full check more selective
Dispatch should not check LSQ size/LSQ stall for non load/store instructions. This work was done while Binh was an intern at AMD Research.
-rw-r--r--src/cpu/o3/iew_impl.hh28
1 files changed, 7 insertions, 21 deletions
diff --git a/src/cpu/o3/iew_impl.hh b/src/cpu/o3/iew_impl.hh
index 20d3a1c36..9c6a44bf2 100644
--- a/src/cpu/o3/iew_impl.hh
+++ b/src/cpu/o3/iew_impl.hh
@@ -793,25 +793,6 @@ DefaultIEW<Impl>::checkStall(ThreadID tid)
} else if (instQueue.isFull(tid)) {
DPRINTF(IEW,"[tid:%i]: Stall: IQ is full.\n",tid);
ret_val = true;
- } else if (ldstQueue.isFull(tid)) {
- DPRINTF(IEW,"[tid:%i]: Stall: LSQ is full\n",tid);
-
- if (ldstQueue.numLoads(tid) > 0 ) {
-
- DPRINTF(IEW,"[tid:%i]: LSQ oldest load: [sn:%i] \n",
- tid,ldstQueue.getLoadHeadSeqNum(tid));
- }
-
- if (ldstQueue.numStores(tid) > 0) {
-
- DPRINTF(IEW,"[tid:%i]: LSQ oldest store: [sn:%i] \n",
- tid,ldstQueue.getStoreHeadSeqNum(tid));
- }
-
- ret_val = true;
- } else if (ldstQueue.isStalled(tid)) {
- DPRINTF(IEW,"[tid:%i]: Stall: LSQ stall detected.\n",tid);
- ret_val = true;
}
return ret_val;
@@ -1074,8 +1055,13 @@ DefaultIEW<Impl>::dispatchInsts(ThreadID tid)
++iewIQFullEvents;
break;
- } else if (ldstQueue.isFull(tid)) {
- DPRINTF(IEW, "[tid:%i]: Issue: LSQ has become full.\n",tid);
+ }
+
+ // Check LSQ if inst is LD/ST
+ if ((inst->isLoad() && ldstQueue.lqFull(tid)) ||
+ (inst->isStore() && ldstQueue.sqFull(tid))) {
+ DPRINTF(IEW, "[tid:%i]: Issue: %s has become full.\n",tid,
+ inst->isLoad() ? "LQ" : "SQ");
// Call function to start blocking.
block(tid);