Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

[BUG] <title> FPU error behavior #2766

Open
1 task done
yutong0505 opened this issue Feb 11, 2025 · 1 comment
Open
1 task done

[BUG] <title> FPU error behavior #2766

yutong0505 opened this issue Feb 11, 2025 · 1 comment
Labels
notCV32A65X It is not an CV32A65X issue PARAM:FPU Issue depends on the FPU parameter Type:Bug For bugs in the RTL, Documentation, Verification environment or Tool and Build system

Comments

@yutong0505
Copy link

Is there an existing CVA6 bug for this?

  • I have searched the existing bug issues

Bug Description

When using the FPU with NUM_OPGROUPS set to 4, if we issue FADD, FSQRT, and FCMP consecutively in different cycles, and two of these instructions complete execution simultaneously, the out_valid_o signal of one instruction drops before out_ready_i is asserted (G31 and G32 out_valid_o at the same time). This causes the commit process to be unable to commit that instruction.

Image

Image

Thanks for your help
@yutong0505 yutong0505 added the Type:Bug For bugs in the RTL, Documentation, Verification environment or Tool and Build system label Feb 11, 2025
@JeanRochCoulon
Copy link
Contributor

Hello @yutong0505
Thank you for your feedback. But this is an FPU issue. As CVA6 reuse FPU subproject, it is better to submit this issue in CVFPU OpenHW projects.

@JeanRochCoulon JeanRochCoulon added notCV32A65X It is not an CV32A65X issue PARAM:FPU Issue depends on the FPU parameter labels Feb 11, 2025
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees
No one assigned
Labels
notCV32A65X It is not an CV32A65X issue PARAM:FPU Issue depends on the FPU parameter Type:Bug For bugs in the RTL, Documentation, Verification environment or Tool and Build system
Projects
None yet
Milestone
No milestone
Development

No branches or pull requests
2 participants
@JeanRochCoulon @yutong0505