common:

• Added a generic bfloat16 SBGEMV kernel
• Fixed a potentially severe memory leak after fork in OpenMP builds
  that was introduced in 0.3.12
• Added detection of the Fujitsu Fortran compiler
• Added detection of the (e)gfortran compiler on OpenBSD
• Added support for overriding the default name of the library independently
  from symbol suffixing in the gmake builds (already supported in cmake)

RISC V:

• Added a RISC V port optimized for C910V

POWER:

• Added optimized POWER10 kernels for SAXPY, CAXPY, SDOT, DDOT and DGEMV_N
• Improved DGEMM performance on POWER10
• Improved STRSM and DTRSM performance on POWER9 and POWER10
• Fixed segmemtation faults in DYNAMIC_ARCH builds
• Fixed compilation with the PGI compiler

x86:

• Fixed compilation of kernels that require SSE2 intrinsics since 0.3.12

x86_64:

• Added an optimized bfloat16 SBGEMV kernel for SkylakeX and Cooperlake
• Improved the performance of SASUM and DASUM kernels through parallelization
• Improved the performance of SROT and DROT kernels
• Improved the performance of multithreaded xSYRK
• Fixed OpenMP builds that use the LLVM Clang compiler together with GNU gfortran
  (where linking of both the LLVM libomp and GNU libgomp could lead to lockups or
  wrong results)
• Fixed miscompilations by old gcc 4.6
• Fixed misdetection of AVX2 capability in some Sandybridge cpus
• Fixed lockups in builds combining DYNAMIC_ARCH with TARGET=GENERIC on OpenBSD

ARM64:

• Fixed segmentation faults in DYNAMIC_ARCH builds

MIPS:

• Improved kernels for Loongson 3R3 ("3A") and 3R4 ("3B") models, including MSA
• Fixed bugs in the MSA kernels for CGEMM, CTRMM, CGEMV and ZGEMV
• Added handling of zero increments in the MSA kernels for SSWAP and DSWAP
• Added DYNAMIC_ARCH support for MIPS64 (currently Loongson3R3/3R4 only)

SPARC:

• Fixed building 32 and 64 bit SPARC kernels with the SolarisStudio compilers

md5sum:
2ca05b9cee97f0d1a8ab15bd6ea2b747 OpenBLAS-0.3.13.tar.gz
ab433ae7ed37ad282a67c2cfcc7c4301 OpenBLAS-0.3.13.zip
855469f768c6e32cf68f9cdb6f5fa69e OpenBLAS-0.3.13-x64.zip
467463847f57f54b94242fb6393a0bf9 OpenBLAS-0.3.13-x86.zip

common:

• Fixed missing BLAS/LAPACK functions (inadvertently dropped during
  the build system restructuring to support selective compilation)
• Fixed argument conversion macro in LAPACKE_zgesvdq (LAPACK #458)

POWER:

• Added optimized SCOPY/CCOPY kernels for POWER10
• Increased and unified the default size of the GEMM buffer
• Fixed building for POWER10 in DYNAMIC_ARCH mode
• POWER10 compatibility test now checks binutils version as well
• Cleaned up compiler warnings

x86_64:

• corrected compiler version checks for AVX2 compatibility
• added compiler option -mavx2 for building with flang
• fixed direct SGEMM pathway for small matrix sizes (broken by
  the code refactoring in 0.3.11)
• fixed unhandled partial register clobbers in several kernels
  for AXPY,DOT,GEMV_N and GEMV_T flagged by gcc10 tree-vectorizer

ARMV8:

• improved Apple Vortex support to include cross-compiling

md5sums:
03bff4558fc701b7d0e689814055ecb2 OpenBLAS-0.3.12.zip
baf8c58c0ef6ebe0f9eb74a5c4acd662 OpenBLAS-0.3.12.tar.gz
4df4ebb7b5c4f1b5ec8fa58f48be6a51 OpenBLAS-0.3.12-x64.zip

common:

• Improved thread locking behaviour in blas_server and parallel getrf
• Imported bugfix 394 from LAPACK (spurious reference to "XERBL"
  due to overlong lines)
• Imported bugfix 403 from LAPACK (compile option "recursive" required
  for correctness with Intel and PGI)
• Imported bugfix 408 from LAPACK (wrong scaling in ZHEEQUB)
• Imported bugfix 411 from LAPACK (infinite loop in LARGV/LARTG/LARTGP)
• Fixed mismatches between BUFFERSIZE and GEMM_UNROLL parameters that
  could lead to crashes at large matrix sizes
• Restored internal soname in dynamic libraries on FreeBSD and Dragonfly
• Added API (openblas_setaffinity) to set thread affinity
  programmatically on Linux
• Added initial infrastructure for half-precision floating point
  (bfloat16) support with a generic implementation of SHGEMM
• Added CMAKE build system support for building the cblas_Xgemm3m
  functions
• Fixed CMAKE support for building in a path with embedded spaces
• Fixed CMAKE (non)handling of NO_EXPRECISION and MAX_STACK_ALLOC
• Fixed GCC version detection in the Makefiles
• Allowed overriding the names of AR, AS and LD in Makefile builds

POWER:

• fixed big-endian POWER8 ELFv2 builds on FreeBSD
• Fixed GCC version checks and DYNAMIC_ARCH builds on POWER9
• Fixed CMAKE build support for POWER9
• fixed a potential race condition in the thread buffer allocation
• Worked around LAPACK test failures on PPC G4

MIPS:

• fixed a potential race condition in the thread buffer allocation
• Added support for MIPS 24K/24KE family based on P5600 kernels

MIPS64:

• fixed a potential race condition in the thread buffer allocation
• Added TARGET=GENERIC

ARMV7:

• fixed a race condition in the thread buffer allocation

ARMV8:

• Fixed a race condition in the thread buffer allocation
• Fixed zero initialisation in the assembly for SGEMM and DGEMM BETA
• Improved performance of the ThunderX2 DAXPY kernel
• Added an optimized SGEMM kernel for Cortex A53
• Fixed Makefile support for INTERFACE64 (8-byte integer)

x86_64:

• Fixed a syntax error in the CMAKE setup for SkylakeX
• Improved performance of STRSM on Haswell, SkylakeX and Ryzen
• Improved SGEMM performance on SGEMM for workloads with ldc a
  multiple of 1024
• Improved DGEMM performance on Skylake X
• Fixed unwanted AVX512-dependency of SGEMM in DYNAMIC_ARCH
  builds created on SkylakeX
• Removed data alignment requirement in the SSE2 copy kernels
  that could cause spurious crashes
• Added a workaround for an optimizer bug in AppleClang 11.0.3
• Fixed LAPACK-TEST failures with Intel Fortran
• Fixed compilation and LAPACK test results with recent Flang
  and AMD AOCC
• Fixed DYNAMIC_ARCH builds with CMAKE on OS X
• Fixed missing exports of cblas_i?amin, cblas_i?min, cblas_i?max,
  cblas_?sum, cblas_?gemm3m in the shared library on OS X
• Fixed reporting of cpu name in DYNAMIC_ARCH builds (would sometimes
  show the name of an older generation chip supported by the same kernels)

IBM Z:

• Improved performance of SGEMM/STRMM and DGEMM/DTRMM on Z14

common:

• Fixed a miscompilation of the GETRF functions with CMAKE
• The size of the memory buffer used for splitting GEMM tasks across
  multiple threads can now be configured in the build system.
• Imported bugfix 390 from LAPACK (missing NaN propagation in xCOMBSSQ)

POWER:

• fixed several compilation problems related to endianness and
  ELF version support on POWER8 and POWER9.
• fixed misuse of the absolute value IAMIN/IAMAX in place of IMIN/IMAX
• fixed a race condition in the level3 blas code

MIPS64:

• fixed misuse of the absolute value IAMIN/IAMAX in place of IMIN/IMAX

ARMV7:

• fixed a race condition in the level3 blas code
• fixed a compilation problem on Android

ARMV8:

• Added support for Ampere EMAG8180
• Added support for Neoverse N1
• improved performance of the blas_lock function
• fixed a race condition in the level3 blas code
• Fixed a performance regression on TSV110 servers

x86_64:

• Fixed a long-standing error with undeclared register clobbers in
  the DSCAL microkernel for Haswell,SkylakeX and Zen exposed by gcc9.2
• Fixed a long-standing bug in the SSE implementation of the IAMAX functions
• Fixed a cmake build failure with DYNAMIC_ARCH on x86_64
• Fixed an oversight in the cpu detection code for Intel Goldmont+,
  Cannon Lake and Ice Lake
• Fixed compile failure on OSX when the compiler name contains a dash
  (e.g. gcc-9)
• Fixed compilation with MinGW on SkylakeX
• Improved speed of the AVX512 GEMM3M code, added an AVX512 kernel for
  STRMM and improved performance of the AVX2 GEMM kernels

IBM Z:

• fixed compilation of the DYNAMIC_ARCH code

common:

- LAPACK has been updated to 3.9.0 (plus patches up to January 2nd, 2020)
- CMAKE support has been improved in several areas including cross-compilation
- a thread race condition in the GEMM3M kernels was resolved
- the "generic" (plain C) gemm beta kernel used by many targets has been sped up
- an optimized version of the LAPACK trtrs functions has been added
- an incompatibilty between the LAPACK tests and the OpenBLAS implementation of XERBLA
  was resolved, removing the numerous warnings about wrong error exits in the former 
- support for NetBSD has been added
- support for compilation with g95 and non-GNU versions of ld has been improved
- compilation with (upcoming) gcc 10 is now supported

POWER:

- worked around miscompilation of several POWER8 and POWER9 kernels by
  older versions of gcc
- added support for big-endian POWER8 and for compilation on AIX
- corrected bugs in the big-endian support for PPC440 and PPC970
- DYNAMIC_ARCH support is now available in CMAKE builds as well

ARMV8:

- performance of DGEMM_BETA and SGEMM_NCOPY has been improved
- compilation for 32bit works again 
- performance of the RPCC function has been improved
- improved performance on small systems
- DYNAMIC_ARCH support is now available in CMAKE builds as well
- cross-compilation from OSX to IOS was simplified

x86_64:

- a new AVX512 DGEMM kernel was added and the AVX512 SGEMM kernel was
  significantly improved
- optimized AVX512 kernels for CGEMM and ZGEMM have been added
- AVX2 kernels for STRMM, SGEMM, and CGEMM have been significantly
  sped up and optimized CGEMM3M and ZGEMM3M kernels have been added 
- added support for QEMU virtual cpus
- a compilation problem with PGI and SUN compilers was fixed
- Intel "Goldmont plus" is now autodetected
- a potential crash on program exit on MS Windows has been fixed 
   

x86:

- an unwanted case sensitivity in the implementation of LSAME
  on older 32bit AMD cpus was fixed

IBM Z:

- Z15 is now supported as Z14
- DYNAMIC_ARCH is now available on ZARCH as well

common:

• having the gmake special variables TARGET_ARCH or TARGET_MACH defined no longer causes build failures in ctest or utest
• defining NO_AFFINITY or USE_TLS to zero in gmake builds no longer has the same effect as setting them to one
• a new test program was added to allow checking the library for thread safety
• a new option USE_LOCKING was added to ensure thread safety when OpenBLAS itself is built without multithreading but
  will be called from multiple threads.
• a build failure on Linux with glibc versions earlier than 2.5 was fixed
• a runtime error with CPU enumeration (and NO_AFFINITY not set) on glibc 2.6 was fixed
• NO_AFFINITY was added to the CMAKE options (and defaults to being active on Linux, as in the gmake builds)

x86_64

• the build-time logic for detection of AVX512 availability in the processor and compiler was fixed
• gmake builds on OSX now set the internal name of the library to libopenblas.0.dylib (consistent with CMAKE)
• the Haswell DGEMM kernel received a significant speedup through improved prefetch and load instructions
• performance of DGEMM, DTRMM, DTRSM and ZDOT on Zen/Zen2 was markedly increased by avoiding vpermpd instructions
• the SKYLAKEX (AVX512) DGEMM helper functions have now been disabled to fix remaining errors in DGEMM, DSYMM and DTRMM

POWER:

• added support for building on FreeBSD/powerpc64 and FreeBSD/ppc970
• added optimized kernels for POWER9 single and double precision complex BLAS3
• added optimized kernels for POWER9 SGEMM and STRMM

ARMV7:

• fixed the softfp implementations of xAMAX and IxAMAX
• removed the predefined -march= flags on both ARMV5 and ARMV6 as they were appropriate for only a subset of platforms

common:

- the build tools now check that a given cpu TARGET is actually valid
- the build-time check of system features (c_check) has been made
  less dependent on particular perl features (this should mainly
  benefit building on Windows)
- several problems with ReLAPACK and its integration were fixed,
  including INTERFACE64 support and building a shared library
- building with CMAKE on BSD systems was improved
- a non-absolute SUM function was added based on the
  existing optimized code for ASUM
- CBLAS interfaces to the IxMIN and IxMAX functions were added
- a name clash between LAPACKE and BOOST headers was resolved
- CMAKE builds with OpenMP failed to include the appropriate getrf_parallel
  kernels
- a crash on thread (key) deletion with the USE_TLS=1 memory management
  option was fixed
- restored several earlier fixes, in particular for OpenMP performance,
  building on BSD, and calling fork on CYGWIN, which had inadvertently
  been dropped in the 0.3.3 rewrite of the memory management code.
  

POWER:

- single precision BLAS1/2 functions have received optimized POWER8 kernels
- POWER9 is now a separate target, with an optimized DGEMM/DTRMM kernel
- building on PPC970 systems under OSX Leopard or Tiger is now supported
- out-of-bounds memory accesses in the gemm_beta microkernels were fixed
- building a shared library on AIX is now supported for POWER6
- DYNAMIC_ARCH support has been added for POWER6 and newer

ARMV7:

- corrected xDOT behaviour with zero INC_X or INC_Y 
- a bug in the IMIN implementation made it return the result of IMAX

ARMV8:

- added support for HiSilicon TSV110 cpus
- the CMAKE build system now recognizes 32bit userspace on 64bit hardware 
- cross-compilation with CMAKE now works again
- a bug in the IMIN implementation made it return the result of IMAX
- ARMV8 builds with the BINARY=32 option are now automatically handled as ARMV7

x86_64:

- the AVX512 DGEMM kernel has been disabled again due to unsolved problems
- building with old versions of MSVC was fixed
- it is now possible to build a static library on Windows with CMAKE
- accessing environment variables on CYGWIN at run time was fixed
- the CMAKE build system now recognizes 32bit userspace on 64bit hardware
- Intel "Denverton" atom and Hygon "Dhyana" zen CPUs are now autodetected
- building for DYNAMIC_ARCH with a DYNAMIC_LIST of targets is now supported
  with CMAKE as well
- building for DYNAMIC_ARCH with GENERIC as the default target is now supported
- a buffer overflow in the SSE GEMM kernel for Intel Nano targets was fixed
- assembly bugs involving undeclared modification of input operands were fixed
  in the AXPY, DOT, GEMV, GER, SCAL, SYMV and TRSM microkernels for Nehalem, 
  Sandybridge, Haswell, Bulldozer and Piledriver. These would typically cause
  test failures or segfaults when compiled with recent versions of gcc from 8 onward.
- a similar bug was fixed in the blas_quickdivide code used to split workloads
  in most functions
- a bug in the IxMIN implementation for the GENERIC target made it return the result of IxMAX
- fixed building on SkylakeX systems when either the compiler or the (emulated) operating 
  environment does not support AVX512
- improved GEMM performance on ZEN targets

x86:

- build failures caused by the recently added checks for AVX512 were fixed
- an inline assembly bug involving undeclared modification of an input argument was
  fixed in the blas_quickdivide code used to split workloads in most functions
- a bug in the IMIN implementation for the GENERIC target made it return the result of IMAX

MIPS32:

- a bug in the IMIN implementation made it return the result of IMAX

IBM Z:

- optimized microkernels for single precicion BLAS1/2 functions have been added for Z13 and Z14