10.1 Notes on CACHE Instruction Operations
All CACHE instruction variations are performed serially. From the aspect of the primary cache, this means CACHE instructions can impede the instruction stream. For this reason, load/store speculation is not allowed beyond a CACHE instruction until the CACHE instruction has graduated. All load/store accesses, including writebacks to the external agent, must be complete before the CACHE instruction can graduate, and any load/store following a CACHE instruction cannot be issued speculatively until the CACHE instruction graduates. Uncached operations and instruction fetches are not affected.
Copyright 1995, MIPS Technologies, Inc. -- 29 JAN 96
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