A LOCK-BASED AND SYNCH-BASED METHOD FOR OUT OF ORDER LOADS IN A MEMORY CONSISTENCY MODEL USING SHARED MEMORY RESOURCES

摘要

In a processor, a lock-based method for out of order loads in a memory consistency model using shared memory resources. The method includes implementing a memory resource that can be accessed by a plurality of cores; and implementing an access mask that functions by tracking which words of a cache line are accessed via a load, wherein the cache line includes the memory resource, wherein the load sets a mask bit within the access mask when accessing a word of the cache line, and wherein the mask bit blocks accesses from other loads from a plurality of cores. The method further includes checking the access mask upon execution of subsequent stores from the plurality of cores to the cache line; and causing a miss prediction when a subsequent store to the portion of the cache line sees a prior mark from a load in the access mask, wherein the subsequent store will signal a load queue entry corresponding to that load by using a tracker register and a thread ID register.