OpenBLAS Files

general:

• Reworked the unfinished implementation of HUGETLB from GotoBLAS for allocating huge memory pages as buffers on suitable systems
• Changed the unfinished implementation of GEMM3M for the generic target on all architectures to at least forward to regular GEMM
• Improved multithreaded GEMM performance for large non-skinny matrices
• Improved BLAS3 performance on larger multicore systems through improved parallelism
• Improved performance of the initial memory allocation by reducing locking overhead
• Improved performance of GBMV at small problem sizes by introducing a size barrier for the switch to multithreading
• Added an implementation of the CBLAS_GEMM_BATCH extension
• Fixed miscompilation of CAXPYC and ZAXPYC on all architectures in CMAKE builds (error introduced in 0.3.27)
• Fixed corner cases involving the handling of NAN and INFINITY arguments in ?SCAL on all architectures
• Added support for cross-compiling to WEBM with CMAKE (in addition to the already present makefile support)
• Fixed NAN handling and potential accuracy issues in compilations with Intel ICX by supplying a suitable fp-model option by default
• The contents of the github project wiki have been converted into a new set of documentation included with the source code.
• It is now possible to register a callback function that replaces the built-in support for multithreading with an external backend like TBB (openblas_set_threads_callback_function)
• Fixed potential duplication of suffixes in shared library naming
• Improved C compiler detection by the build system to tolerate more naming variants for gcc builds
• Fixed an unnecessary dependency of the utest on CBLAS
• Fixed spurious error reports from the BLAS extensions utest
• Fixed unwanted invocation of the GEMM3M tests in cross-compilation
• Fixed a flaw in the makefile build that could lead to the pkgconfig file containing an entry of UNKNOWN for the target cpu after installing
• Integrated fixes from the Reference-LAPACK project:
• Fixed uninitialized variables in the LAPACK tests for ?QP3RK (PR 961)
• Fixed potential bounds error in ?UNHR_COL/?ORHR_COL (PR 1018)
• Fixed potential infinite loop in the LAPACK testsuite (PR 1024)
• Make the variable type used for hidden length arguments configurable (PR 1025)
• Fixed SYTRD workspace computation and various typos (PR 1030)
• Prevent compiler use of FMA that could increase numerical error in ?GEEVX (PR 1033)

x86_64:

• reverted thread management under Windows to its state before 0.3.26 due to signs of race conditions in some circumstances now under study
• fixed accidental selection of the unoptimized generic SBGEMM kernel in CMAKE builds for CooperLake and SapphireRapids targets
• fixed a potential thread buffer overrun in SBSTOBF16 on small systems
• fixed an accuracy issue in ZSCAL introduced in 0.3.26
• fixed compilation with CMAKE and recent releases of LLVM
• added support for Intel Emerald Rapids and Meteor Lake cpus
• added autodetection support for the Zhaoxin KX-7000 cpu
• fixed autodetection of Intel Prescott (probably broken since 0.3.19)
• fixed compilation for older targets with the Yocto SDK
• fixed compilation of the converter-generated C versions of the LAPACK sources with gcc-14
• improved compiler options when building with CMAKE and LLVM for AVX512-capable targets
• added support for supplying the L2 cache size via an environment variable (OPENBLAS_L2_SIZE) in case it is not correctly reported (as in some VM configurations)
• improved the error message shown when thread creation fails on startup
• fixed setting the rpath entry of the dylib in CMAKE builds on MacOS

arm:

• fixed building for baremetal targets with make

arm64:

• Added a fast path forwarding SGEMM and DGEMM calls with a 1xN or Mx1 matrix to the corresponding GEMV kernel
• added optimized SGEMV and DGEMV kernels for A64FX
• added optimized SVE kernels for small-matrix GEMM
• added A64FX to the cpu list for DYNAMIC_ARCH
• fixed building with support for cpu affinity
• worked around accuracy problems with C/ZNRM2 on NeoverseN1 and Apple M targets
• improved GEMM performance on Neoverse V1
• fixed compilation for NEOVERSEN2 with older compilers
• fixed potential miscompilation of the SVE SDOT and DDOT kernels
• fixed potential miscompilation of the non-SVE CDOT and ZDOT kernels
• fixed a potential overflow when using very large user-defined BUFFERSIZE
• fixed setting the rpath entry of the dylib in CMAKE builds on MacOS

power:

• Added a fast path forwarding SGEMM and DGEMM calls with a 1xN or Mx1 matrix to the corresponding GEMV kernel
• significantly improved performance of SBGEMM on POWER10
• fixed compilation with OpenMP and the XLF compiler
• fixed building of the BLAS extension utests under AIX
• fixed building of parts of the LAPACK testsuite with XLF
• fixed CSWAP/ZSWAP on big-endian POWER10 targets
• fixed a performance regression in SAXPY on POWER10 with OpenXL
• fixed accuracy issues in CSCAL/ZSCAL when compiled with LLVM
• fixed building for POWER9 under FreeBSD
• fixed a potential overflow when using very large user-defined BUFFERSIZE
• fixed an accuracy issue in the POWER6 kernels for GEMM and GEMV

riscv64:

• Added a fast path forwarding SGEMM and DGEMM calls with a 1xN or Mx1 matrix to the corresponding GEMV kernel
• fixed building for RISCV64_GENERIC with OpenMP enabled
• added DYNAMIC_ARCH support (comprising GENERIC_RISCV64 and the two RVV 1.0 targets with vector length of 128 and 256)
• worked around the ZVL128B kernels for AXPBY mishandling the special case of zero Y increment

loongarch64:

• improved GEMM performance on servers of the 3C5000 generation
• improved performance and stability of DGEMM
• improved GEMV and TRSM kernels for LSX and LASX vector ABIs
• fixed CMAKE compilation with the INTERFACE64 option set
• fixed compilation with CMAKE
• worked around spurious errors flagged by the BLAS3 tests
• worked around a miscompilation of the POTRS utest by gcc 14.1 mips64:
• fixed ASUM and SUM kernels to accept negative step sizes in X
• fixed complex GEMV kernels for MSA

md5sums: 0f54185b6ef804173c01b9a40520a0e8 OpenBLAS-0.3.28.tar.gz 2b3bb81f49453b12c4a563579bfc1e9f OpenBLAS-0.3.28.zip 80001511e2af8265ca88acaf8d37f308 OpenBLAS-0.3.28-x64-64.zip a526ff1012d4a5dd1ec1130704195a73 OpenBLAS-0.3.28-x64.zip 660158a21ffe9c7e65877b6c358a4aca OpenBLAS-0.3.28-x86.zip