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gemv: call scal for degenerate matrices #569

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Jan 17, 2020
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gemv: call scal for degenerate matrices #569

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12 changes: 4 additions & 8 deletions src/blas/KokkosBlas2_gemv.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,8 @@
#include <sstream>
#include <type_traits> // requires C++11, but so does Kokkos

#include <KokkosBlas1_scal.hpp>

namespace KokkosBlas {

/// \brief Dense matrix-vector multiply: y = beta*y + alpha*A*x.
Expand Down Expand Up @@ -139,15 +141,9 @@ gemv (const char trans[],
typename YViewType::device_type,
Kokkos::MemoryTraits<Kokkos::Unmanaged> > YVT;

if ((trans[0] == 'T' || trans[0] == 't') && A.extent(0) == 0
#ifdef KOKKOS_ENABLE_CUDA
&& !std::is_same<typename AViewType::device_type::execution_space, Kokkos::Cuda>::value
#endif
)
if (A.extent(0) == 0 || A.extent(1) == 0)
{
const bool eti_spec_avail = KokkosBlas::Impl::gemv_eti_spec_avail<AVT, XVT, YVT>::value;
typedef Impl::GEMV<AVT, XVT, YVT, false, eti_spec_avail> fallback_impl_type;
fallback_impl_type::gemv (trans, alpha, A, x, beta, y);
KokkosBlas::scal(y, beta, y);
}
else
{
Expand Down