rebase

* Add dedicated POWER9 build (using new syntax to ensure it runs as a P9-only containerized job rather than a VM that
might end up on P8 hardware half of the time)
* Bump gcc version for POWER9 build

Add memory barrier to the PPC blas_lock implementation for Linux

Fix Makefiles still mishandling NO_CBLAS=0 and NO_LAPACKE=0

s390x: GEMM tuning for z14

rebase

We recently changed the register blocking for SGEMM on s390x to 16x4.
However, we did not adjust Q to a multiple of 16 and thus fell back to
the 8x4 kernel at each block's margin, without need. Adjust P and Q to
multiples of 16 to employ the faster 16x4 kernel for complete full-sized
blocks.

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

For small register blockings that are too small to fill up vector
registers with column vectors, we currently use a generic code block.
Replace that with instantiations of the generic code as individual
functions, so that the compiler can optimize each one separately.

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

Improve performance of SGEMM and DGEMM on z14 and z15 by unrolling and
interleaving the inner loop of the SGEMM 16x4 and DGEMM 8x4 blocks.
Specifically, we explicitly interleave vector register loads and
computation of two iterations.

Note that this change only adds one C function, since SGEMM 16x4 and
DGEMM 8x4 actually map to the same C code: they both hold intermediate
results in a 4x4 grid of vector registers, and the C implementation is
built around that.

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

Fix array overruns in the LIN part of the LAPACK testsuite

as recommended by cparrott73 in #2760

Remove extra symbol in Makefile

While trying out different unroll values, noted that
make failed due to this extra symbol.

Fix GCC ubsan warnings in x86_64 complex dot and gemv_t kernels

Fix lapack-tests linking to a suffixed libopenblas in cmake builds

fixes GCC ubsan warning in the BLAS tests

fixes GCC ubsan report in the BLAS tests

fixes GCC ubsan report of "left shift of negative value -2" in the BLAS tests

fixes GCC ubsan report of "left shift of negative value -2" in the BLAS tests

rebase

Add SYMBOLPREFIX and/or SYMBOLSUFFIX to cblas prototypes

Protect against inadvertent activation of USE_CUDA

Use systemcfg APIs for CPU detection on AIX

AIX libc already provides ready access to an integer that contains a bit
identifying the CPU it's running on, so there's no need to call a
program and grep its output. Additionally, prtconf is not available in
the PASE runtime, which provides an AIX emulation layer on the IBM i
operating system.

The AIX systemcfg.h also provides macro definitions like POWER_8,
POWER_9, etc for all the bits defining the CPUs as well as macros like
__power_8(), __power_9_andup() that return booleans, but I did not use
them. Since these macros depend on the level of the OS in which it is
built, they may not be defined and instead the associated hex literals
are used directly.

Reorganize OpenMP build options for POWER and allow compiling for POWER9 with old gcc

dgemv optimization for POWER10

Making use of new vector pair POWER10 instructions in dgemv_n and dgemv_t.
Also adding a new block 4x128 to make use of Matrix-Multiply Assist (MMA)
feature introduced in POWER ISA v3.1.  Tested on simulator and there
are no new test failures.