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    • 3. 发明授权
    • Method and apparatus for implementing a branch target buffer cache with
multiple BTB banks
    • 用于实现具有多个BTB组的分支目标缓冲器高速缓存的方法和装置
    • US5842008A
    • 1998-11-24
    • US665516
    • 1996-06-18
    • Simcha GochmanNicolas Kacevas
    • Simcha GochmanNicolas Kacevas
    • G06F9/38
    • G06F9/3806
    • A Branch Target Buffer Circuit in a computer processor that predicts branch instructions within a stream of computer instructions is disclosed. The Branch Target Buffer Circuit uses a Branch Target Buffer Cache with multiple BTB banks that store branch information about previously executed branch instructions. The branch information stored in each bank of the Branch Target Buffer Cache is addressed by the last byte of each branch instruction When an Instruction Fetch Unit in the computer processor fetches a block of instructions it sends the Branch Target Buffer Circuit an instruction pointer. Based on the instruction pointer, the Branch Target Buffer Circuit looks in the Branch Target Buffer Cache banks to see if any of the instructions in the block being fetched is a branch instruction. When the Branch Target Buffer Circuit finds an upcoming branch instruction in the Branch Target Buffer Cache, the Branch Target Buffer Circuit informs an instruction Fetch Unit about the upcoming branch instruction.
    • 公开了一种计算机处理器中的分支目标缓冲器电路,其预测计算机指令流内的分支指令。 分支目标缓冲器电路使用具有多个BTB组的分支目标缓冲器高速缓存,其存储关于先前执行的分支指令的分支信息。 存储在分支目标缓冲区高速缓冲存储器的每个存储区中的分支信息由每个分支指令的最后一个字节寻址。当计算机处理器中的指令获取单元获取指令块时,它发送分支目标缓冲器电路指令指针。 基于指令指针,分支目标缓冲器电路查找分支目标缓冲区高速缓冲存储区,以查看正在获取的块中的任何指令是否是分支指令。 当分支目标缓冲器电路在分支目标缓冲器高速缓存中发现即将到来的分支指令时,分支目标缓冲器电路通知指令提取单元关于即将到来的分支指令。