OpenBLAS Files

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