Signed-off-by: Hao Chen <chenhao@loongson.cn>

Signed-off-by: Hao Chen <chenhao@loongson.cn>

Signed-off-by: Hao Chen <chenhao@loongson.cn>

Signed-off-by: Hao Chen <chenhao@loongson.cn>

Fixes: https://github.com/OpenMathLib/OpenBLAS/issues/4366

Add some refines and optimizations for LoongArch.

for skylake kernels. This is the same method as used in [sd]asum.
_mm_set1_epi64x was commented out for zasum, but has the advantage
of avoiding possible undefined behaviour (using an uninitialized
variable), optimized out by NVHPC and icx. The new code works
fine with those compilers.

For GCC 12.3 the generated code is identical; no matter what method
you use, the compiler optimizes the code into a compile-time
constant, there is no performance benefit using mm_cmpeq_epi8
since the corresponding instruction (VPCMPEQB) isn't actually
generated!

* Temporarily disable the C/ZASUM microkernels for any version of NVHPC

This kernel is only used on Skylake+ if the kernel with AVX512
intrinsics can't be used, but used the variable x1 incorrectly
in the tail end of the loop, as it is still at the initial
value instead of where x points to.

This caused 55 "other error"s in the LAPACK tests
(https://github.com/OpenMathLib/OpenBLAS/issues/4282)

This change makes casum.c as similar as possible as zasum.c,
because zasum.c does this correctly.

POWER10 optimizations are disabled when using default AIX assembler.
As we have fixed many issues recently, enabling optimization path
for default assembler.

This patch increases the macro size limit from 4096 to 16384 to
allow compiling larger assembly files in AIX.
Tested with GCC and IBM Open XL C.

POWER10: Fix compilation issues with Open XL C

This patch removes intermediate m4 conversions used in sbgemm
compilation as it is not needed for .c files.
Tested on AIX with gcc and IBM Open XL C.