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o3: make dispatch LSQ full check more selective

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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.
This commit is contained in:
Binh Pham 2014-06-21 10:26:55 -07:00
parent 0782d92286
commit b72c879868
1 changed files with 7 additions and 21 deletions
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28
src/cpu/o3/iew_impl.hh
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@ -793,25 +793,6 @@ DefaultIEW<Impl>::checkStall(ThreadID tid)
} else if (instQueue.isFull(tid)) { } else if (instQueue.isFull(tid)) {
DPRINTF(IEW,"[tid:%i]: Stall: IQ is full.\n",tid); DPRINTF(IEW,"[tid:%i]: Stall: IQ is full.\n",tid);
ret_val = true; 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; return ret_val;
@ -1074,8 +1055,13 @@ DefaultIEW<Impl>::dispatchInsts(ThreadID tid)
++iewIQFullEvents; ++iewIQFullEvents;
break; 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. // Call function to start blocking.
block(tid); block(tid);