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    • 4. 发明申请
    • EXPANSION OF A STACKED REGISTER FILE USING SHADOW REGISTERS
    • 使用阴影寄存器扩展堆栈寄存器文件
    • WO2007059475A2
    • 2007-05-24
    • PCT/US2006/060849
    • 2006-11-13
    • QUALCOMM INCORPORATEDBABBAR, Uppinder SinghKAPOOR, Rohit
    • BABBAR, Uppinder SinghKAPOOR, Rohit
    • G06F9/30
    • G06F9/30123G06F9/30101G06F9/30116G06F9/30134G06F9/30138
    • One or more Shadow Register Files (SRF) are interposed between a Physical Register File (PRF) and a Backing Store (BS) in a shadow register file system. The SRFs comprise dual-port registers connected serially in a chain of arbitrary depth from the PRF. A Register Save Engine has random access to one port of the registers in the final SRF in the chain, and saves/restores data between the final SRF and the BS, e.g., RAM. As PRF registers are deallocated from calling procedures for use by called procedures, data are serially shifted from multi-port registers in the PRF through successive corresponding dual-port registers in SRFs, and are serially shifted back toward the multi-port registers as the PRF registers are reallocated to calling procedures. Since no procedure can access more than the number of registers in the PRF, the effective size of the PRF is increased, using less costly dual-port registers.
    • 一个或多个影子寄存器文件(SRF)插入在影子寄存器文件系统中的物理寄存器文件(PRF)和备份存储(BS)之间。 SRF包括串行连接在与PRF任意深度的链中的双端口寄存器。 寄存器保存引擎具有对链中最终SRF中的寄存器的一个端口的随机访问,并且在最终SRF和BS之间保存/恢复数据,例如RAM。 由于PRF寄存器被从被调用过程使用的调用过程中分配,数据从PRF中的多端口寄存器通过SRF中的连续对应的双端口寄存器串行移位,并且作为PRF连续地向多端口寄存器移回 寄存器被重新分配给调用过程。 由于没有任何程序可以访问PRF中的寄存器数量,所以使用较便宜的双端口寄存器来增加PRF的有效大小。