title: Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° Ð¼Ð¾Ð´ÑÐ»Ñ Ð¿ÑÐµÐ´ÑÐºÐ°Ð·Ð°ÑÐµÐ»Ñ Ð¸Ð½ÑÑÑÑÐºÑÐ¸Ð¹ Ð¿ÐµÑÐµÑ Ð¾Ð´Ð° Ð´Ð»Ñ RISC-V Ð¿ÑÐ¾ÑÐµÑÑÐ¾ÑÐ° Ñ Ð¼Ð½Ð¾Ð¶ÐµÑÑÐ²ÐµÐ½Ð½Ð¾Ð¹ Ð²ÑÐ±Ð¾ÑÐºÐ¾Ð¹ Ð¸Ð½ÑÑÑÑÐºÑÐ¸Ð¹
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Branch predictor implementation for the multiple-issue RISC-V CPU
Creators: name: ÐÐ½Ð¸ÐºÐµÐµÐ², ÐÐ¸ÑÐ¸Ð»Ð»
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2020
Subjects: Ð¿ÑÐµÐ´ÑÐºÐ°Ð·Ð°Ð½Ð¸Ðµ Ð²ÐµÑÐ²Ð»ÐµÐ½Ð¸Ð¹
ÐºÐ¾Ð¼Ð¿ÑÑÑÐµÑÐ½Ð°Ñ Ð°ÑÑ Ð¸ÑÐµÐºÑÑÑÐ°
risc-v
Ð°Ð»Ð³Ð¾ÑÐ¸ÑÐ¼Ñ Ð¿ÑÐµÐ´ÑÐºÐ°Ð·Ð°Ð½Ð¸Ñ Ð¸Ð½ÑÑÑÑÐºÑÐ¸Ð¹ Ð¿ÐµÑÐµÑ Ð¾Ð´Ð°
Ð½ÐµÐ¹ÑÐ¾Ð½Ð½ÑÐ¹ Ð¿ÑÐµÐ´ÑÐºÐ°Ð·Ð°ÑÐµÐ»Ñ Ð²ÐµÑÐ²Ð»ÐµÐ½Ð¸Ð¹
tage Ð¿ÑÐµÐ´ÑÐºÐ°Ð·Ð°ÑÐµÐ»Ñ Ð²ÐµÑÐ²Ð»ÐµÐ½Ð¸Ð¹
ÑÐ¸Ð½ÑÐµÑÐ¸ÑÐµÑÐºÐ¸Ðµ ÑÐµÑÑÑ Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´Ð¸ÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸
ÑÑÐ½ÐºÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½Ð¾Ðµ Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ
Ð¼Ð¸ÐºÑÐ¾Ð°ÑÑ Ð¸ÑÐµÐºÑÑÑÐ°
branch prediction
computer architecture
prediction algorithms
neural branch predictor
tage branch predictor
benchmark testing
functional modeling
microarchitecture

description: Ð¢ÐµÐ¼Ð° Ð²ÑÐ¿ÑÑÐºÐ½Ð¾Ð¹ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð¾Ð¹ ÑÐ°Ð±Ð¾ÑÑ: Â«Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° Ð¼Ð¾Ð´ÑÐ»Ñ Ð¿ÑÐµÐ´-ÑÐºÐ°Ð·Ð°ÑÐµÐ»Ñ Ð¸Ð½ÑÑÑÑÐºÑÐ¸Ð¹ Ð¿ÐµÑÐµÑÐ¾Ð´Ð° Ð´Ð»Ñ RISC-V Ð¿ÑÐ¾ÑÐµÑÑÐ¾ÑÐ° Ñ Ð¼Ð½Ð¾Ð¶ÐµÑÑÐ²ÐµÐ½Ð½Ð¾Ð¹ Ð²Ñ-Ð±Ð¾ÑÐºÐ¾Ð¹ Ð¸Ð½ÑÑÑÑÐºÑÐ¸Ð¹Â». ÐÐ°Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¿Ð¾ÑÐ²ÑÑÐµÐ½Ð° ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐºÐµ ÑÐ»ÑÑÑÐµÐ½Ð½Ð¾Ð³Ð¾ Ð¼Ð¾Ð´ÑÐ»Ñ Ð¿ÑÐµÐ´ÑÐºÐ°Ð·Ð°ÑÐµÐ»Ñ Ð¸Ð½ÑÑÑÑÐºÑÐ¸Ð¹ Ð¿ÐµÑÐµÑÐ¾Ð´Ð° Ñ Ð¿Ð¾Ð²ÑÑÐµÐ½Ð½Ð¾Ð¹ ÑÐ¾ÑÐ½Ð¾ÑÑÑÑ Ð¿ÑÐµÐ´ÑÐºÐ°Ð·Ð°Ð½Ð¸Ð¹ Ð´Ð»Ñ ÑÐ²ÐµÐ»Ð¸ÑÐµÐ½Ð¸Ñ Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´Ð¸ÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸ Ð¿ÑÐ¾ÑÐµÑÑÐ¾ÑÐ°. ÐÐ°Ð´Ð°ÑÐ¸, ÐºÐ¾ÑÐ¾ÑÑÐµ ÑÐµÑÐ°Ð»Ð¸ÑÑ Ð² ÑÐ¾Ð´Ðµ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°-Ð½Ð¸Ñ: 1. ÐÐ·ÑÑÐµÐ½Ð¸Ðµ Ð°Ð»Ð³Ð¾ÑÐ¸ÑÐ¼Ð¾Ð² Ð¿ÑÐµÐ´ÑÐºÐ°Ð·Ð°Ð½Ð¸Ñ Ð²ÐµÑÐ²Ð»ÐµÐ½Ð¸Ð¹ Ð¸ ÐºÐ¾Ð½ÑÐ»Ð¸ÐºÑÐ¾Ð² Ð¿Ð¾ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ Ð² RISC-V Ð¿ÑÐ¾ÑÐµÑÑÐ¾ÑÐµ Ñ ÐºÐ¾Ð½Ð²ÐµÐ¹ÐµÑÐ½Ð¾Ð¹ Ð°ÑÑÐ¸ÑÐµÐºÑÑÑÐ¾Ð¹. 2. Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° Ð¸ ÑÐ¸Ð¼ÑÐ»ÑÑÐ¸Ñ Ð¿ÑÐ¾Ð³ÑÐ°Ð¼Ð¼Ð½ÑÑ ÑÑÐ½ÐºÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½ÑÑ Ð¼Ð¾Ð´ÐµÐ»ÐµÐ¹ Ð°Ð»-Ð³Ð¾ÑÐ¸ÑÐ¼Ð¾Ð² Ð¿ÑÐµÐ´ÑÐºÐ°Ð·Ð°Ð½Ð¸Ñ Ð²ÐµÑÐ²Ð»ÐµÐ½Ð¸Ð¹. 3. Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° Ð¼Ð¸ÐºÑÐ¾Ð°ÑÑÐ¸ÑÐµÐºÑÑÑÑ Ð¼Ð¾Ð´ÑÐ»Ñ Ð¿ÑÐµÐ´ÑÐºÐ°Ð·Ð°ÑÐµÐ»Ñ Ð¸Ð½ÑÑÑÑÐºÑÐ¸Ð¹ Ð¿Ðµ-ÑÐµÑÐ¾Ð´Ð° Ð´Ð»Ñ RISC-V Ð¿ÑÐ¾ÑÐµÑÑÐ¾ÑÐ°. 4. ÐÐ¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ Ð¸ ÑÐ°ÑÐ°ÐºÑÐµÑÐ¸Ð·Ð°ÑÐ¸Ñ ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½Ð½Ð¾Ð³Ð¾ Ð¼Ð¾Ð´ÑÐ»Ñ Ð¿ÑÐµÐ´ÑÐºÐ°Ð·Ð°ÑÐµ-Ð»Ñ Ð²ÐµÑÐ²Ð»ÐµÐ½Ð¸Ð¹. Ð Ð°Ð±Ð¾ÑÐ° Ð¿ÑÐ¾Ð²ÐµÐ´ÐµÐ½Ð° Ð½Ð° Ð±Ð°Ð·Ðµ ÐÐÐ Â«Ð¡Ð¸Ð½ÑÐ°ÐºÐ¾ÑÂ», Ð³Ð´Ðµ ÑÐ¾Ð±Ð¸ÑÐ°Ð»Ð°ÑÑ Ð·Ð½Ð°ÑÐ¸ÑÐµÐ»ÑÐ½Ð°Ñ ÑÐ°ÑÑÑ ÑÐ°ÐºÑÐ¸ÑÐµÑÐºÐ¾Ð³Ð¾ Ð¼Ð°ÑÐµÑÐ¸Ð°Ð»Ð°: ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÑ ÑÐ¸Ð½ÑÐµÑÐ¸ÑÐµÑÐºÐ¸Ñ ÑÐµÑÑÐ¾Ð² Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´Ð¸-ÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸, Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ Ð¿ÑÐ¾Ð³ÑÐ°Ð¼Ð¼Ð½ÑÑ ÑÑÐ½ÐºÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½ÑÑ Ð¼Ð¾Ð´ÐµÐ»ÐµÐ¹ Ð¸ Ð¼Ð¸ÐºÑÐ¾-Ð°ÑÑÐ¸ÑÐµÐºÑÑÑÐ½Ð¾Ð¹ ÑÐµÐ°Ð»Ð¸Ð·Ð°ÑÐ¸Ð¸ Ð¼Ð¾Ð´ÑÐ»Ñ Ð¿ÑÐµÐ´ÑÐºÐ°Ð·Ð°ÑÐµÐ»Ñ Ð²ÐµÑÐ²Ð»ÐµÐ½Ð¸Ð¹. ÐÑÐ»Ð¾ Ð¿ÑÐ¾Ð²ÐµÐ´ÐµÐ½Ð¾ ÑÐ½ÑÑÐ¸Ðµ ÑÐ°ÑÐ°ÐºÑÐµÑÐ¸ÑÑÐ¸Ðº ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½Ð½Ð¾Ð³Ð¾ Ð¼Ð¾Ð´ÑÐ»Ñ Ð¿ÑÐµÐ´ÑÐºÐ°Ð·Ð°ÑÐµÐ»Ñ Ð¸Ð½ÑÑÑÑÐºÑÐ¸Ð¹ Ð¿ÐµÑÐµ-ÑÐ¾Ð´Ð¾Ð², Ð¿Ð¾ÐºÐ°Ð·ÑÐ²Ð°ÑÑÐµÐµ ÑÐ²ÐµÐ»Ð¸ÑÐµÐ½Ð¸Ðµ Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´Ð¸ÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸ ÑÐ°ÑÑÐ¼Ð°ÑÑÐ¸Ð²Ð°ÐµÐ¼Ð¾Ð³Ð¾ Ð¦ÐÐ£. Ð ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÐµ Ð±ÑÐ»Ð¸ ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½Ñ ÑÑÐ½ÐºÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½ÑÐµ Ð¼Ð¾Ð´ÐµÐ»Ð¸ Ð°Ð»Ð³Ð¾ÑÐ¸ÑÐ¼Ð¾Ð² Ð¿ÑÐµÐ´ÑÐºÐ°Ð·Ð°Ð½Ð¸Ñ Ð²ÐµÑÐ²Ð»ÐµÐ½Ð¸Ð¹, Ð¿ÑÐ¾Ð²ÐµÐ´ÐµÐ½Ñ Ð¸Ñ ÑÐ¸Ð¼ÑÐ»ÑÑÐ¸Ñ Ð¸ Ð°Ð½Ð°Ð»Ð¸Ð·. ÐÐ° Ð¾ÑÐ½Ð¾Ð²Ð°Ð½Ð¸Ð¸ ÑÐµ-Ð·ÑÐ»ÑÑÐ°ÑÐ¾Ð² ÑÑÐ½ÐºÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½Ð¾Ð³Ð¾ Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ, Ð´Ð»Ñ RISC-V Ð¿ÑÐ¾ÑÐµÑÑÐ¾ÑÐ° Ð±ÑÐ»Ð¸ ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½Ñ Ð¼Ð¸ÐºÑÐ¾Ð°ÑÑÐ¸ÑÐµÐºÑÑÑÐ½ÑÐµ ÑÐµÐ°Ð»Ð¸Ð·Ð°ÑÐ¸Ð¸ Ð´Ð²ÑÑ Ð°Ð»Ð³Ð¾ÑÐ¸ÑÐ¼Ð¾Ð² Ð¿ÑÐµÐ´ÑÐºÐ°Ð·Ð°Ð½Ð¸Ñ Ð¸Ð½ÑÑÑÑÐºÑÐ¸Ð¹ Ð¿ÐµÑÐµÑÐ¾Ð´Ð¾Ð² Ñ Ð½Ð°Ð¸Ð»ÑÑÑÐ¸Ð¼Ð¸ Ð¿Ð¾ÐºÐ°Ð·Ð°ÑÐµÐ»ÑÐ¼Ð¸ ÑÐ¾ÑÐ½Ð¾ÑÑÐ¸. ÐÐ°Ðº ÑÐµÐ·ÑÐ»ÑÑÐ°Ñ Ð¿ÑÐ¾Ð²ÐµÐ´ÐµÐ½Ð½ÑÑ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ð¹ Ð² ÐÐÐ Â«Ð¡Ð¸Ð½ÑÐ°ÐºÐ¾ÑÂ», Ð±ÑÐ» ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½ Ð¼Ð¾Ð´ÑÐ»Ñ Ð¿ÑÐµÐ´-ÑÐºÐ°Ð·Ð°ÑÐµÐ»Ñ Ð²ÐµÑÐ²Ð»ÐµÐ½Ð¸Ð¹ Ñ ÑÐ»ÑÑÑÐµÐ½Ð½ÑÐ¼ Ð¿Ð¾ÐºÐ°Ð·Ð°ÑÐµÐ»ÐµÐ¼ ÑÐ¾ÑÐ½Ð¾ÑÑÐ¸. ÐÐ°Ð½Ð½ÑÐ¹ Ð¼Ð¾Ð´ÑÐ»Ñ ÑÐ»ÑÑÑÐ°ÐµÑ Ð±ÑÑÑÑÐ¾Ð´ÐµÐ¹ÑÑÐ²Ð¸Ðµ Ð¦ÐÐ£.
description: The subject of the graduate qualification work is âBranch predictor implemen-tation for the multiple-issue RISC-V CPUâ. The given work is devoted to the implementation of the enhanced branch pre-diction unit to increase RISC-V CPU performance. The research set the following goals: 1. Studying branch prediction algorithms and control hazards in pipelined RISC-V processor; 2. Implementation and simulation of software functional models of branch prediction algorithms; 3. Microarchitecture design of branch predictor unit as a part of RISC-V CPU; 4. Simulation and performance analysis of implemented branch prediction unit. The work was fulfilled on the premises of Syntacore LLC, which included CPU benchmark testing, branch predictors software and hardware design and im-plementation as well as simulation and performance measurements. Branch predictor unit, implemented during the research, increases performance of the processor. The study resulted into simulation and analysis of branch prediction algo-rithms, with software and hardware implementations being made. There were devel-oped microarchitectures for two best-performing modern branch prediction algo-rithms as a part of RISC-V processor pipeline. The outcome of the research at Syn-tacore LLC was an enhanced branch prediction unit, which increases processor per-formance.