SpMM demo errors out on several Suitesparse matrices

[reikdas]

I tried the spmm_demo executable on several randomly chosen Suitesparse matrices and I found some that give an error.

I have gotten 2 different types of errors with these matrices.

Some matrices give the error SpMM DDT code != reference solution.:
https://sparse.tamu.edu/VDOL/tumorAntiAngiogenesis_2
https://sparse.tamu.edu/VDOL/tumorAntiAngiogenesis_8
https://sparse.tamu.edu/HB/wm1

Some matrices give a segmentation fault:
https://sparse.tamu.edu/Meszaros/baxter
https://sparse.tamu.edu/Schenk_IBMNA/c-49
https://sparse.tamu.edu/Meszaros/aa5
https://sparse.tamu.edu/VDOL/freeFlyingRobot_9
https://sparse.tamu.edu/Rommes/juba40k
https://sparse.tamu.edu/FIDAP/ex24
https://sparse.tamu.edu/PARSEC/SiH4
https://sparse.tamu.edu/Mycielski/mycielskian2

On debugging, it seems like the segmentation fault happens at this line:

partially-strided-codelet/src/spmm_codelets/SpMMGenericCode.cpp

Line 169 in c03d059

double xj = Bx[j + k * bRows];

Are these errors expected since there are certain classes of matrices that this repository cannot handle?

[cheshmi]

Some of these matrices have large values and we found existing libraries such as MKL produce some rounding error.
I am not sure about the seg fault. Tag @cetiniz to see if he can help.

[cetiniz]

I think the segfaults are probably caused by some unhandled edge cases (i.e. boundary conditions). For example, https://sparse.tamu.edu/Mycielski/mycielskian2 only has 2 rows + 2 columns which may be revealing an unsupported edge case in the psc_t1_2D4R_gemm codelet type.