About

OpenBLAS is a library providing an optimized implementation of the Basic Linear Algebra Subprograms API. See https://github.com/xianyi/OpenBLAS

Status

Development	COMPLETED	OpenBLAS architecture makes a truly scalable implementation difficult; we have augmented the VLEN=512 implementation with a Neon-comparable VLEN=128
Development Timeline
Upstreaming	COMPLETED
Upstream Version	xianyi/OpenBLAS at risc-v (github.com)
Contacts	Simon Harvey Ken Unger	Ken's PR was merged to the upstream RISC-V branch but is limited to VLEN=512 implementations Imagination would support a general vector implementation
Dependencies

14 Dec 2023

Earlier upstreamed fixes have been merged to risc-v branch
Two new PRs submitted upstream:
- - An implementation supporting a 128-vector length: https://github.com/OpenMathLib/OpenBLAS/pull/4355
  - An improvement to the RVV kernel-generation script to make accurate use of LMUL

30 Oct 2023

Level 3 API implemented for 128-bit vector (separate from existing 512-bit vector)
Upstreaming of remaining work is blocked until 2 existing PRs merged

04 Aug 2023

Upstreamed fix for use of masked intrinsics: https://github.com/xianyi/OpenBLAS/pull/4125
Upstreamed fix for tail policy handling: https://github.com/xianyi/OpenBLAS/pull/4159
With the above changes, level 1 and level 2 routines now work with VLEN other than 512-bits
Further work ongoing to make level 3 API to be VLEN agnostic.

27 Jun 2023