Invention Application
- Patent Title: IMMEDIATE BRANCH RECODE THAT HANDLES ALIASING
- Patent Title (中): 立即分配掌握手柄
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Application No.: US14491149Application Date: 2014-09-19
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Publication No.: US20160085550A1Publication Date: 2016-03-24
- Inventor: Shyam Sundar , Richard F. Russo , Ronald P. Hall , Conrado Blasco
- Applicant: Apple Inc.
- Main IPC: G06F9/30
- IPC: G06F9/30 ; G06F12/08 ; G06F12/10 ; G06F9/38

Abstract:
A system and method for efficiently indicating branch target addresses. A semiconductor chip predecodes instructions of a computer program prior to installing the instructions in an instruction cache. In response to determining a particular instruction is a control flow instruction with a displacement relative to a program counter address (PC), the chip replaces a portion of the PC relative displacement in the particular instruction with a subset of a target address. The subset of the target address is an untranslated physical subset of the full target address. When the recoded particular instruction is fetched and decoded, the remaining portion of the PC relative displacement is added to a virtual portion of the PC used to fetch the particular instruction. The result is concatenated with the portion of the target address embedded in the fetched particular instruction to form a full target address.
Public/Granted literature
- US09940262B2 Immediate branch recode that handles aliasing Public/Granted day:2018-04-10
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