https://github.com/wavefunction91/scalapackpp/blob/6397f52cf11c0dfd82a79698ee198a2fce515d81/include/scalapackpp/pblas/gemm.hpp#L24 These two lines check if A and C or B and C are the same pointer. However, there is a situation where A, B, and C are all `nullptr` for no computation being necessary on a certain rank. These assertions will cause a failure in debug mode.