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Strip UTF8 byte order marker from source files

powerpc: Optimized SHGEMM kernel for POWER10

Add cpu detection support for comet lake U

Fix for #2671

This patch introduces new optimized version of SHGEMM kernel
using power10 Matrix-Multiply Assist (MMA) feature introduced in
POWER ISA v3.1. This patch makes use of new POWER10 compute instructions
for matrix multiplication operation.

Tested on simulator and there are no new test failures.

Comet Lake U CPUs have family: 6, model: 6, extended family: 0, and
extended model: 10 were not being correctly detected by GETARCH during
openblas builds and would show CORE=UNKNOWN and LIBCORE=unknown. This
commit adds the necessary information to cpuid_x86 to detect extended
family 10 model 6 and return the proper core information. It's
essentially just a skylake cpu, not skylake x, so I just took the used
the same return fields as skylake.

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POWER10 Optimized GEMM kernels

address vs2019 C4293 warning

This patch introduces new optimized version of ZGEMM kernel
using power10 Matrix-Multiply Assist (MMA) feature introduced in
POWER ISA v3.1. This patch makes use of new POWER10 compute instructions
for matrix multiplication operation.

Tested on simulator and there are no new test failures.
Cycles count reduced by 30-50%  compared to POWER9 version depending on
M/N/K sizes.

This patch introduces new optimized version of SGEMM, CGEMM and DGEMM
using power10 Matrix-Multiply Assist (MMA) feature introduced in
POWER ISA v3.1. This patch makes use of new POWER10 compute instructions
for matrix multiplication operation.

Tested on simulator and there are no new test failures.
Cycles count reduced by 30-50%  compared to POWER9 version depending on
M/N/K sizes.
MMA GCC patch for reference:
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=8ee2640bfdc62f835ec9740278f948034bc7d9f1

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AVX512 DGEMM TCOPY_16 Function

powerpc: Add support for future processor

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Zarch fix gcc detection

cpp_thread_test: Change adjustment of concurrency on systems with <52 hw threads

The two test cases dgemv_tester and dgemm_tester accept the degree of
concurrency as command line argument (amongst others). Fail early if
value 0 has been specified, instead of later with less-clear symptoms.

Signed-off-by: Marius Hillenbrand <mhillen@linux.ibm.com>

... instead of (number of hw threads - 4) to avoid invalid numbers on
smaller systems. Currently, systems with 4 or fewer CPUs (e.g., small CI
VMs) would fail the test. Fixes one of the issues discussed in #2668

Signed-off-by: Marius Hillenbrand <mhillen@linux.ibm.com>

... to bring unified gcc version detection with common variables to the
one remaining spot in Makefile.system.

Signed-off-by: Marius Hillenbrand <mhillen@linux.ibm.com>

Employ common variables for gcc version detection and fix the broken
check for gcc >= 5.2.
Fixes #2668

Signed-off-by: Marius Hillenbrand <mhillen@linux.ibm.com>

Fix spelling of flang option -Mrecursive, add -Kieee and workaround for AOCC optimizer bug

Update BLAS tests to what netlib 3.9.0 uses

Add missing exported symbols.

Respect predefined defaults for AR, AS, LD and RANLIB

Report selected DYNAMIC_ARCH kernel rather than one of its aliases in gotoblas_corename

replaces calculation of machine precision with call to epsilon intrinsic and removes the requirement for previous output files to be removed before rerunning tests

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