FoRUmS

How to access branch prediction tables from the GSHARE predictor in the SweRV EH2 core used in the labs

Last Post

prvbharadwaj98

(@prvbharadwaj98)

New Member

Joined: 10 months ago

Posts: 1

26/11/2021 9:36 pm

One of my projects require evaluating the performance of the branch predictor onboard the EH2 core, for which I need access to the global branch history table maintained inside the core. How do I access this data using OpenOCD ? Additionally, how do I remove/disable branch prediction for the same core ?

ReplyQuote

Topic Tags

branch prediction EH2 core Nexys A7-100T

dchaver

(@dchaver)

Member Moderator

Joined: 2 years ago

Posts: 43

30/11/2021 8:14 am

Hi prvbharadwaj98,
We are very close to the release of RVfpga v2.0 ( https://university.imgtec.com/rvfpga/). In this new version of the RVfpga materials, among many other things, we explain in detail how to enable/disable the different structures of the SweRV EH1 core (including the Branch Predictor), according to Table 10-1 of the PRM ( https://github.com/chipsalliance/Cores-SweRV/blob/master/docs/RISC-V_SweRV_EH1_PRM.pdf). Also, in Lab 16, we perform a detailed analysis of branch instructions and the Branch Predictor used in SweRV EH1. In future RVfpga versions, we plan to include some analysis and exercises about exporting the information of the different core structures (including the Branch Predictor) in simulation.
I hope you find this information useful. If you have any other questions, please let us know.
Best regards
Daniel

RCWO liked

ReplyQuote

Forum Statistics

6 Forums

87 Topics

390 Posts

0 Online

4,387 Members

Latest Post: How to simulate SweRV core in vivado Our newest member: kelvinmarrero Recent Posts Unread Posts Tags

Forum Icons: Forum contains no unread posts Forum contains unread posts Mark all read

Topic Icons: Not Replied Replied Active Hot Sticky Unapproved Solved Private Closed

Super Globals

Requests: Array ( )

Server: Array ( )

Options and Features

permastruct: forums
use_home_url: 0
url: https://university.imgtec.com/forums/
Array
(
    [title] => Imagination University Programme Forum
    [description] => Imagination University Programme Discussion Board
    [menu_position] => 23
    [lang] => 1
)
pageid:41
default_groupid: 3
Array
(
    [layout_extended_intro_topics_toggle] => 0
    [layout_extended_intro_topics_count] => 5
    [layout_extended_intro_topics_length] => 45
    [layout_qa_intro_topics_toggle] => 1
    [layout_qa_intro_topics_count] => 3
    [layout_qa_intro_topics_length] => 90
    [layout_threaded_intro_topics_toggle] => 0
    [layout_threaded_filter_buttons] => 1
    [layout_threaded_add_topic_button] => 1
    [layout_threaded_intro_topics_count] => 10
    [layout_threaded_intro_topics_length] => 0
    [display_current_viewers] => 1
    [layout_threaded_display_subforums] => 1
)
Array
(
    [layout_extended_intro_posts_toggle] => 1
    [layout_extended_intro_posts_count] => 4
    [layout_extended_intro_posts_length] => 50
    [layout_qa_posts_per_page] => 15
    [layout_qa_comments_limit_count] => 3
    [layout_qa_first_post_reply] => 1
    [comment_body_min_length] => 2
    [comment_body_max_length] => 0
    [layout_threaded_posts_per_page] => 5
    [layout_threaded_nesting_level] => 5
    [layout_threaded_first_post_reply] => 1
    [union_first_post] => Array
        (
            [1] => 0
            [2] => 0
            [3] => 1
            [4] => 0
        )

[topic_body_min_length] => 2
    [topic_body_max_length] => 0
    [post_body_min_length] => 2
    [post_body_max_length] => 0
    [recent_posts_type] => topics
    [tags] => 1
    [max_tags] => 5
    [tags_per_page] => 100
    [edit_topic] => 1
    [edit_post] => 1
    [edit_log_display_limit] => 0
    [display_current_viewers] => 1
    [display_recent_viewers] => 1
    [display_admin_viewers] => 1
    [topics_per_page] => 10
    [eot_durr] => 300
    [dot_durr] => 300
    [posts_per_page] => 15
    [eor_durr] => 300
    [dor_durr] => 300
    [search_max_results] => 100
    [max_upload_size] => 10485760
    [attach_cant_view_msg] => You are not permitted to view this attachment
    [toolbar_location_topic] => top
    [toolbar_location_reply] => top
)
Array
(
    [custom_title_is_on] => 1
    [default_title] => Member
    [members_per_page] => 15
    [online_status_timeout] => 240
    [url_structure] => nicename
    [search_type] => filter
    [login_url] => 
    [register_url] => 
    [lost_password_url] => 
    [redirect_url_after_login] => https://university.imgtec.com/
    [redirect_url_after_register] => https://university.imgtec.com/forums/account/
    [redirect_url_after_confirm_sbscrb] => https://university.imgtec.com/forums/account/
    [title_usergroup] => Array
        (
            [1] => 1
            [5] => 1
            [4] => 1
            [2] => 1
        )

[title_second_usergroup] => Array
        (
            [3] => 1
        )

[rating] => Array
        (
            [0] => Array
                (
                    [points] => 0
                    [title] => New Member
                    [color] => #d2d2d2
                    [icon] => far fa-star-half
                )

[1] => Array
                (
                    [points] => 5
                    [title] => Active Member
                    [color] => #4dca5c
                    [icon] => fas fa-star
                )

[2] => Array
                (
                    [points] => 20
                    [title] => Eminent Member
                    [color] => #4dca5c
                    [icon] => fas fa-star
                )

[3] => Array
                (
                    [points] => 50
                    [title] => Trusted Member
                    [color] => #4dca5c
                    [icon] => fas fa-star
                )

[4] => Array
                (
                    [points] => 100
                    [title] => Estimable Member
                    [color] => #4dca5c
                    [icon] => fas fa-star
                )

[5] => Array
                (
                    [points] => 250
                    [title] => Reputable Member
                    [color] => #4dca5c
                    [icon] => fas fa-star
                )

[6] => Array
                (
                    [points] => 500
                    [title] => Honorable Member
                    [color] => #e5d600
                    [icon] => fas fa-certificate
                )

[7] => Array
                (
                    [points] => 750
                    [title] => Prominent Member
                    [color] => #e5d600
                    [icon] => fas fa-certificate
                )

[8] => Array
                (
                    [points] => 1000
                    [title] => Noble Member
                    [color] => #e5d600
                    [icon] => fas fa-certificate
                )

[9] => Array
                (
                    [points] => 2500
                    [title] => Famed Member
                    [color] => #ff812d
                    [icon] => fas fa-shield-alt
                )

[10] => Array
                (
                    [points] => 5000
                    [title] => Illustrious Member
                    [color] => #e04a47
                    [icon] => fas fa-trophy
                )

)

[rating_title_ug] => Array
        (
            [5] => 1
            [4] => 1
            [3] => 1
        )

[rating_badge_ug] => Array
        (
            [1] => 1
            [5] => 1
            [4] => 1
            [2] => 1
            [3] => 1
        )

)
Array
(
 [from_name] => Imagination University Programme - Forum
 [from_email] => iup@imgtec.com
 [admin_emails] => iup@imgtec.com
 [new_topic_notify] => 1
 [new_reply_notify] => 1
 [confirmation_email_subject] => Please confirm subscription to [entry_title]
 [confirmation_email_message] => Hello [member_name]! Thank you for subscribing. This is an automated response. We are glad to inform you that after confirmation you will get updates from - [entry_title]. Please click on link below to complete this step. [confirm_link]
 [new_topic_notification_email_subject] => New Topic
 [new_topic_notification_email_message] => Hello [member_name]! New topic has been created on your subscribed forum - [forum].[topic_title]<blockquote>[topic_desc]</blockquote> <hr />If you want to unsubscribe from this forum please use the link below. [unsubscribe_link]
 [new_post_notification_email_subject] => New Reply
 [new_post_notification_email_message] => Hello [member_name]! New reply has been posted on your subscribed topic - [topic].[reply_title]<blockquote>[reply_desc]</blockquote> <hr />If you want to unsubscribe from this topic please use the link below. [unsubscribe_link]
 [report_email_subject] => Forum Post Report
 [report_email_message] => Report details: Reporter: [reporter], Message: [message],[post_url]
 [overwrite_new_user_notification_admin] => 1
 [wp_new_user_notification_email_admin_subject] => [blogname] New User Registration
 [wp_new_user_notification_email_admin_message] => New user registration with [blogname]:Username: [user_login] Personal Email: [user_email]When the user sets their password you will receive a full summary of their profile information.
 [overwrite_new_user_notification] => 1
 [wp_new_user_notification_email_subject] => Welcome to the Imagination University Programme
 [wp_new_user_notification_email_message] => Dear user [user_login]Welcome to the Imagination University Programme (IUP)You must now Set Your Password using the following link and then you can Log In to your account. [set_password_url]After Log-In, you can update your profile via the ''My Account'' link under your username.The benefits of joining the IUP include:- High-quality Teaching materials in English, Chinese and other languages on our Teaching Resources page - Access to our IUP Support Forum - Exclusive video tutorials for our Teaching Materials - Links to our Hardware, Software and Training Partners - Regular updates on the IUP and news about Imagination Technologies - Invitations to Seminars and Training Events specifically for TeachersIf you have any questions, please email: iup@imgtec.comThank you very much for joining our IUP community.Best Wishes, The Imagination University Programme Team尊敬的 [user_login]欢迎加入Imagination大学项目(IUP)， 您现在需要使用下方的链接设置您的账户密码， 方可激活您的账户。 登陆后您可在您用户名下拉菜单中的'My Account'中更新你的个人信息。[set_password_url]加入IUP的利益包括但不限于:-访问我们的教材页面提供的高质量的中、英文教材 -访问我们的IUP论坛 -观看为我们教材定制的独家视频教程 -访问我们的硬件、软件和培训合作伙伴 -定期获取关于IUP和Imagination Technologies的新闻 -受邀参加专门为教师举办的研讨会和培训活动如果您有任何疑问， 请发邮件至iup@imgtec.com非常感谢您加入我们的IUP社区。祝好 Imagination大学项目团队
 [overwrite_reset_password_email_message] => 1
 [reset_password_email_message] => Hello!You asked us to reset your password for your account using the email address [user_login].If this was a mistake, or you didn't ask for a password reset, just ignore this email and nothing will happen.To reset your password, visit the following address:[reset_password_url]Thanks!
 [user_mention_notify] => 1
 [user_mention_email_subject] => You have been mentioned in forum post
 [user_mention_email_message] => Hi [mentioned-user-name]!You have been mentioned in a post on "[topic-title]" by [author-user-name].Post URL: [post-url]
)
Array
(
 [user-admin-bar] => 0
 [page-title] => 0
 [top-bar] => 1
 [top-bar-search] => 1
 [breadcrumb] => 0
 [footer-stat] => 1
 [mention-nicknames] => 1
 [content-do_shortcode] => 0
 [view-logging] => 1
 [track-logging] => 1
 [goto-unread] => 1
 [goto-unread-button] => 0
 [profile] => 1
 [user-register] => 1
 [user-register-email-confirm] => 1
 [disable_new_user_admin_notification] => 0
 [register-url] => 1
 [login-url] => 1
 [resetpass-url] => 0
 [replace-avatar] => 1
 [avatars] => 1
 [custom-avatars] => 1
 [signature] => 1
 [rating] => 1
 [rating_title] => 1
 [member_cashe] => 1
 [object_cashe] => 1
 [memory_cashe] => 1
 [seo-title] => 1
 [seo-meta] => 1
 [seo-profile] => 1
 [rss-feed] => 0
 [user-synch] => 0
 [notifications] => 1
 [notifications-live] => 0
 [notifications-bar] => 1
 [bp_activity] => 0
 [bp_notification] => 0
 [bp_forum_tab] => 0
 [um_notification] => 0
 [um_forum_tab] => 0
 [font-awesome] => 2
 [output-buffer] => 1
 [wp-date-format] => 0
 [subscribe_conf] => 1
 [subscribe_checkbox_on_post_editor] => 1
 [subscribe_checkbox_default_status] => 0
 [role-synch] => 0
 [attach-media-lib] => 1
 [admin-cp] => 1
 [debug-mode] => 1
 [copyright] => 1
 [option_cache] => 1
 [html_cashe] => 0
)
Array
(
 [font_size_forum] => 17
 [font_size_topic] => 16
 [font_size_post_content] => 14
 [custom_css] => #wpforo #wpforo-wrap {
 font-size: 13px; width: 100%; padding:50px 0; margin:0px;
}

#wpforo #wpforo-wrap .wpforo-profile-wrap .wpforo-profile-head-bg {
 background-color: #e2e2e2;
 background-image: none !important;
}

.wpforo-profile-wrap .h-header .wpfy {
    background-color: transparent;
}

#wpforo #wpforo-wrap .wpforo-profile-wrap .wpf-username {
    color: #000000;
}

#wpforo #wpforo-wrap input[type=\"submit\"], #wpforo #wpforo-wrap input[type=\"reset\"], #wpforo #wpforo-wrap input[type=\"reset\"], #wpforo #wpforo-wrap input[type=\"button\"] {
    background: #FF1256;
    color: #FFFFFF;
    border: none;
    padding:8px 15px!important;
}

#wpforo #wpforo-wrap input[type=\"submit\"]:hover, #wpforo #wpforo-wrap input[type=\"reset\"]:hover {
    background: #cc0033;
}
)
Array
(
    [id] => classic
    [name] => Classic
    [version] => 1.4.0
    [description] => Main wpForo Stylesheet
    [author] => gVectors Team
    [url] => http://wpforo.com
    [file] => classic/style.css
    [folder] => classic
    [layouts] => Array
        (
            [2] => Array
                (
                    [id] => 2
                    [name] => Simplified
                    [version] => 1.0.0
                    [description] => Simplified layout looks simple and clean.
                    [author] => gVectors Team
                    [url] => http://gvectors.com/
                    [file] => classic/layouts/2/forum.php
                )

[3] => Array
                (
                    [id] => 3
                    [name] => QA
                    [version] => 1.0.0
                    [description] => Q&A Layout turns your forum to a powerful question and answer discussion board.
                    [author] => gVectors Team
                    [url] => http://gvectors.com/
                    [file] => classic/layouts/3/forum.php
                )

[1] => Array
                (
                    [id] => 1
                    [name] => Extended
                    [version] => 1.0.0
                    [description] => Extended layout displays one level deeper information in advance.
                    [author] => gVectors Team
                    [url] => http://gvectors.com/
                    [file] => classic/layouts/1/forum.php
                )

[4] => Array
                (
                    [id] => 4
                    [name] => Threaded
                    [version] => 1.0.0
                    [description] => Threaded layout turns your forum to a threads list accented on discussion tree view.
                    [author] => gVectors Team
                    [url] => http://gvectors.com/
                    [file] => classic/layouts/4/forum-sub.php
                )

)

[style] => grey
    [styles] => Array
        (
            [default] => Array
                (
                    [0] => #000000
                    [1] => #ffffff
                    [2] => #333333
                    [3] => #555555
                    [4] => #666666
                    [5] => #777777
                    [6] => #999999
                    [7] => #cccccc
                    [8] => #e6e6e6
                    [9] => #f5f5f5
                    [10] => #dadada
                    [11] => #ff1256
                    [12] => #000000
                    [13] => #72ccfc
                    [14] => #0099cc
                    [15] => #ff1256
                    [16] => #4a8eb3
                    [17] => #dff4ff
                    [20] => #ff812d
                    [30] => #4dca5c
                    [31] => #00a636
                    [32] => #86ba4c
                    [33] => #6fa634
                    [40] => #ff9595
                    [41] => #ff7575
                    [42] => #f46464
                )

[red] => Array
                (
                    [0] => #000000
                    [1] => #ffffff
                    [2] => #333333
                    [3] => #555555
                    [4] => #666666
                    [5] => #777777
                    [6] => #999999
                    [7] => #cccccc
                    [8] => #e6e6e6
                    [9] => #f5f5f5
                    [10] => #dadada
                    [11] => #e0141e
                    [12] => #ee1a26
                    [13] => #fc979c
                    [14] => #e0141e
                    [15] => #99262b
                    [16] => #d61319
                    [17] => #fff7f7
                    [20] => #30b2a7
                    [30] => #4dca5c
                    [31] => #00a636
                    [32] => #86ba4c
                    [33] => #6fa634
                    [40] => #ff9595
                    [41] => #ff7575
                    [42] => #f46464
                )

[green] => Array
                (
                    [0] => #000000
                    [1] => #ffffff
                    [2] => #333333
                    [3] => #555555
                    [4] => #666666
                    [5] => #777777
                    [6] => #999999
                    [7] => #cccccc
                    [8] => #e6e6e6
                    [9] => #f5f5f5
                    [10] => #dadada
                    [11] => #6ea500
                    [12] => #649e2d
                    [13] => #8dce0c
                    [14] => #447714
                    [15] => #5a7f10
                    [16] => #6ea500
                    [17] => #f8fcef
                    [20] => #ff812d
                    [30] => #4dca5c
                    [31] => #00a636
                    [32] => #ff812d
                    [33] => #f47222
                    [40] => #ff9595
                    [41] => #ff7575
                    [42] => #f46464
                )

[orange] => Array
                (
                    [0] => #000000
                    [1] => #ffffff
                    [2] => #333333
                    [3] => #555555
                    [4] => #666666
                    [5] => #777777
                    [6] => #999999
                    [7] => #cccccc
                    [8] => #e6e6e6
                    [9] => #f5f5f5
                    [10] => #dadada
                    [11] => #e0762f
                    [12] => #ff6600
                    [13] => #fc9958
                    [14] => #f26000
                    [15] => #aa4f12
                    [16] => #f26000
                    [17] => #fff4ed
                    [20] => #ff812d
                    [30] => #4dca5c
                    [31] => #00a636
                    [32] => #86ba4c
                    [33] => #6fa634
                    [40] => #ff9595
                    [41] => #ff7575
                    [42] => #f46464
                )

[grey] => Array
                (
                    [0] => #000000
                    [1] => #FFFFFF
                    [2] => #333333
                    [3] => #343434
                    [4] => #666666
                    [5] => #3B3B3B
                    [6] => #FF1256
                    [7] => #999999
                    [8] => #CCCCCC
                    [9] => #E2E2E2
                    [10] => #DADADA
                    [11] => #FF1256
                    [12] => #000000
                    [13] => #7EEA8D
                    [14] => #FF1256
                    [15] => #333333
                    [16] => #555555
                    [17] => #DFF4FF
                    [20] => #00D739
                    [30] => #4DCA5C
                    [31] => #00A636
                    [32] => #86BA4C
                    [33] => #6FA634
                    [40] => #FF9595
                    [41] => #FF7575
                    [42] => #F46464
                )

[dark] => Array
                (
                    [0] => #000000
                    [1] => #141414
                    [2] => #bbbbbb
                    [3] => #000000
                    [4] => #666666
                    [5] => #bcbcbc
                    [6] => #999999
                    [7] => #585858
                    [8] => #727272
                    [9] => #323232
                    [10] => #dadada
                    [11] => #888888
                    [12] => #33779b
                    [13] => #7eea8d
                    [14] => #777777
                    [15] => #e0e0e0
                    [16] => #cecece
                    [17] => #33779b
                    [20] => #ff812d
                    [30] => #4dca5c
                    [31] => #00a636
                    [32] => #86ba4c
                    [33] => #6fa634
                    [40] => #ff9595
                    [41] => #ff7575
                    [42] => #f46464
                )

)

)
classic