公开(公告)号：US20150293847A1

公开(公告)日：2015-10-15

申请号：US14251628

申请日：2014-04-13

Applicant: QUALCOMM Incorporated

Inventor： George PATSILARAS ,  Moinul H. KHAN ,  Pankaj CHAURASIA ,  Bohuslav RYCHLIK ,  Feng WANG ,  Anwar Q. ROHILLAH ,  Subbarao PALACHARLA

IPC: G06F12/08 ,  G06F12/12

CPC classification number: G06F12/0833 ,  G06F1/3275 ,  G06F12/0808 ,  G06F12/0868 ,  G06F12/126 ,  G06F12/128 ,  G06F2212/62 ,  Y02D10/13 ,  Y02D10/14

Abstract: Ephemeral data stored in a cache is read when needed but is not written to system memory so as to save power and bandwidth. In an embodiment, a no-writeback bit associated with the ephemeral data is set in response to a read-no-writeback instruction. Data in a cache line for which its no-writeback bit has been set is not written back into system memory. Accordingly, when evicting cache lines, if a cache line has a no-writeback bit set, then the data in that cache line is discarded without being written back to system memory.

Abstract translation: 存储在缓存中的短暂数据在需要时被读取，但不会写入系统内存，以节省功耗和带宽。 在一个实施例中，响应于无写回指令来设置与短暂数据相关联的无回写位。 已设置其无回写位的高速缓存行中的数据不会写入系统内存。 因此，当驱逐高速缓存行时，如果高速缓存行具有无回写位设置，则该高速缓存行中的数据被丢弃而不被写回系统存储器。