公开(公告)号：US20190294443A1

公开(公告)日：2019-09-26

申请号：US15926429

申请日：2018-03-20

Applicant: QUALCOMM Incorporated

Inventor： Sandeep Suresh Navada ,  Michael Scott McIlvaine ,  Rodney Wayne Smith ,  Robert Douglas Clancy ,  Yusuf Cagatay Tekmen ,  Niket Choudhary ,  Daren Eugene Streett ,  Richard Doing ,  Ankita Upreti

IPC: G06F9/38

Abstract: Providing early pipeline optimization of conditional instructions in processor-based systems is disclosed. In one aspect, an instruction pipeline of a processor-based system detects a mispredicted branch (i.e., following a misprediction of a condition associated with a speculatively executed conditional branch instruction), and records a current state of one or more condition flags as a condition flags snapshot. After a pipeline flush is initiated and a corrected fetch path is restarted, an instruction decode stage of the instruction pipeline uses the condition flags snapshot to apply optimizations to conditional instructions detected within the corrected fetch path. According to some aspects, the condition flags snapshot is subsequently invalidated upon encountering a condition-flag-writing instruction within the corrected fetch path. In this manner, the condition flags snapshot enables non-speculative (with respect to the corrected fetch path) resolution of conditional instructions earlier within the instruction pipeline, thus conserving system resources and improving processor performance.

公开(公告)号：US20170046154A1

公开(公告)日：2017-02-16

申请号：US14860032

申请日：2015-09-21

Applicant: QUALCOMM Incorporated

Inventor： Anil Krishna ,  Rodney Wayne Smith ,  Sandeep Suresh Navada ,  Shivam Priyadarshi ,  Raguram Damodaran

IPC: G06F9/30

CPC classification number: G06F9/30112 ,  G06F9/3838 ,  G06F9/384 ,  G06F9/3857

Abstract: Storing narrow produced values for instruction operands directly in a register map in an out-of-order processor (OoP) is provided. An OoP is provided that includes an instruction processing system. The instruction processing system includes a number of instruction processing stages configured to pipeline the processing and execution of instructions according to a dataflow execution. The instruction processing system also includes a register map table (RMT) configured to store address pointers mapping logical registers to physical registers in a physical register file (PRF) for storing produced data for use by consumer instructions without overwriting logical registers for later executed, out-of-order instructions. In certain aspects, the instruction processing system is configured to write back (i.e., store) narrow values produced by executed instructions directly into the RMT, as opposed to writing the narrow produced values into the PRF in a write back stage.

Abstract translation: 提供将指令操作数的窄生成值直接存储在乱序处理器（OoP）的寄存器映射中。 提供了包括指令处理系统的OoP。 指令处理系统包括多个指令处理阶段，其被配置为根据数据流执行流水线处理和执行指令。 指令处理系统还包括寄存器映射表（RMT），其被配置为存储将逻辑寄存器映射到物理寄存器文件（PRF）中的物理寄存器的地址指针，用于存储由消费者指令使用的产生数据，而不覆盖用于稍后执行的逻辑寄存器 订单说明。 在某些方面，指令处理系统被配置为将由执行的指令产生的窄值直接写入（即存储）到RMT中，而不是在写回阶段将窄的产生值写入PRF。

公开(公告)号：US09471325B2

公开(公告)日：2016-10-18

申请号：US14091340

申请日：2013-11-27

Applicant: QUALCOMM Incorporated

Inventor： Anil Krishna ,  Sandeep Suresh Navada ,  Niket Kumar Choudhary ,  Michael Scott McIlvaine ,  Thomas Andrew Sartorius ,  Rodney Wayne Smith ,  Kenneth Alan Dockser

IPC: G06F9/38

CPC classification number: G06F9/384 ,  G06F9/3824 ,  G06F9/3842 ,  G06F9/3855 ,  G06F9/3861

Abstract: A method and apparatus for allowing an out-of-order processor to reuse an in-use physical register is disclosed herein. The method and apparatus uses identifiers, such as tokens and/or other identifiers in a rename map table (RMT) and a physical register file (PRF), to indicate whether an instruction result is allowed or disallowed to be written into a physical register.

Abstract translation: 本文公开了一种允许无序处理器重用使用中物理寄存器的方法和装置。 该方法和装置使用诸如重命名映射表（RMT）和物理寄存器文件（PRF）中的令牌和/或其他标识符的标识符来指示是否允许或不允许将指令结果写入物理寄存器。

公开(公告)号：US10108417B2

公开(公告)日：2018-10-23

申请号：US14860032

申请日：2015-09-21

Applicant: QUALCOMM Incorporated

Inventor： Anil Krishna ,  Rodney Wayne Smith ,  Sandeep Suresh Navada ,  Shivam Priyadarshi ,  Raguram Damodaran

IPC: G06F9/30 ,  G06F9/38

Abstract: Storing narrow produced values for instruction operands directly in a register map in an out-of-order processor (OoP) is provided. An OoP is provided that includes an instruction processing system. The instruction processing system includes a number of instruction processing stages configured to pipeline the processing and execution of instructions according to a dataflow execution. The instruction processing system also includes a register map table (RMT) configured to store address pointers mapping logical registers to physical registers in a physical register file (PRF) for storing produced data for use by consumer instructions without overwriting logical registers for later executed, out-of-order instructions. In certain aspects, the instruction processing system is configured to write back (i.e., store) narrow values produced by executed instructions directly into the RMT, as opposed to writing the narrow produced values into the PRF in a write back stage.