Microprocessor that performs a two-pass breakpoint check for a cache line-crossing load/store operation

摘要

A microprocessor breakpoint-checks a load/store operation specifying a load/store virtual address of data whose first and second pieces are within first and second cache lines. A queue of entries each include first storage for an address associated with the operation and second storage for an indicator indicating whether there is a match between a page address portion of the virtual address and a page address portion of a breakpoint address. During a first pass through a load/store unit pipeline, the unit performs a first piece breakpoint check using the virtual address, populates the second storage indicator, and populates the first storage with a physical address translated from the virtual address. During the second pass, the unit performs a second piece breakpoint check using the indicator received from the second storage and an incremented version of a page offset portion of the load/store physical address received from the first storage.