Here, the decrementing condition occurs when an issued non speculative store is drained from {HEAD ~ the store buffer} 552 via {TAIL ~ line} 555 to main memory, etc 
Here , the decrementing condition occurs when an issued non speculative store is drained from { HEAD ~ the store buffer } 552 via { TAIL ~ line } 555 to main memory , etc
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH