cublas<T>gemmBatched and null pointer

Accelerated Computing GPU-Accelerated Libraries
1

The gemm Batched functions have arguments A, B, and C which are 1D arrays of pointers to type T. What happens if one of those pointers is null? Will that result in an invalid_value error or will the function quietly ignore it?

Thanks, Roger

2

It can result in an illegal access in GPU device code (in a cublas kernel), a catastrophic GPU fault. It’s possible that the illegal access does not generate a fault, but the results of the operation would still be undefined in that case.