Invention Grant
- Patent Title: Branch target address cache including address type tag bit
- Patent Title (中): 分支目标地址缓存包括地址类型标签位
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Application No.: US12024203Application Date: 2008-02-01
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Publication No.: US07865705B2Publication Date: 2011-01-04
- Inventor: David S. Levitan , Lixin Zhang
- Applicant: David S. Levitan , Lixin Zhang
- Applicant Address: US NY Armonk
- Assignee: International Business Machines Corporation
- Current Assignee: International Business Machines Corporation
- Current Assignee Address: US NY Armonk
- Agency: Dillon & Yudell LLP
- Main IPC: G06F9/35
- IPC: G06F9/35 ; G06F9/355

Abstract:
In at least one embodiment, a processor includes an execution unit and instruction sequencing logic that fetches instructions from a memory system for execution by the execution unit. The instruction sequencing logic includes branch logic that outputs predicted branch target addresses for use as instruction fetch addresses. The branch logic includes a branch target address prediction circuitry concurrently holding a first entry providing storage for a first branch target address prediction associating a first instruction fetch address with a first branch target address to be used as an instruction fetch address and a second entry providing storage for a second branch target address prediction associating the first instruction fetch address with a different second branch target address. The first entry indicates a first instruction address type for the first instruction fetch address, and the second entry indicates a second instruction address type for the first instruction fetch address.
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