Break out of potentially infinite rescaling loop in LAPACK xLARGV/xLARTG/xLARTGP

Small fixes for flang in general and the AMD AOCC version of it in particular

Miscellaneous fixes

Reference-LAPACK issue 411

Optimize AVX512 parallel DGEMM performance

to prevent miscompilation of LAPACK codes and tests on Ryzen

rebase

Add CMAKE support for MAX_STACK_ALLOC setting

Improve performance of SGEMM on Arm Cortex-A53

Add Github Actions test for DYNAMIC_ARCH builds on Linux and macOS

Signed-off-by: ZhangDanfeng <467688405@qq.com>

Signed-off-by: ZhangDanfeng <467688405@qq.com>

Work around PPC G4 test failures

in response to test failures seen in #2628 and BLAS-Tester

Fix CMAKE build Issues on OS X

BUG: Fix the loop range in ZHEEQUB.f

to fix linking problems with (at least) the AMD version of flang that creates dependencies on more than just the fortran runtime.

at least the AMD (aocc) flavor of flang wants to link to a (real or dummy) libomp by default

rebase

Add powerpc (32-bit)

make GCC version detection OS-independent

Only powerpc64 is present.

Previous design put GCC version detection inside of OSNAME 'WINNT'.
However, such detections are required for 'Linux' and possibly other
OS'es as well. For example, there is usage of the GCC versions
in Makefile.arm64. When compiling on Linux machine, in the previous
design, Markfile.arm64 will not know the correct GCC version.

The fix is to move GCC version detection into common part, not
wrapped by anything.

Signed-off-by: Guodong Xu <guodong.xu@linaro.com>

Improve performance of SGEMM and STRMM on Arm Cortex-A53