Tpetra_Details_cublasGemm.cpp

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//          Kokkos: Node API and Parallel Node Kernels
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#include "Tpetra_Details_cublasGemm.hpp"
#include "Kokkos_Macros.hpp"
#ifdef KOKKOS_ENABLE_CUDA
#  include <cublas.h>
#endif // KOKKOS_ENABLE_CUDA
#include <sstream>
#include <stdexcept>

namespace Tpetra {
namespace Details {
namespace Blas {
namespace Cublas {
namespace Impl {

void
cgemm (const char transA,
       const char transB,
       const int m,
       const int n,
       const int k,
       const Kokkos::complex<float>& alpha,
       const Kokkos::complex<float> A[],
       const int lda,
       const Kokkos::complex<float> B[],
       const int ldb,
       const Kokkos::complex<float>& beta,
       Kokkos::complex<float> C[],
       const int ldc)
{
#ifdef KOKKOS_ENABLE_CUDA
  const cuComplex alpha_c = make_cuFloatComplex (alpha.real (), alpha.imag ());
  const cuComplex beta_c = make_cuFloatComplex (beta.real (), beta.imag ());
  cublasCgemm (transA, transB,
               m, n, k,
               alpha_c, reinterpret_cast<const cuComplex*> (A), lda,
               reinterpret_cast<const cuComplex*> (B), ldb,
               beta_c, reinterpret_cast<cuComplex*> (C), ldc);
  cublasStatus info = cublasGetError ();
  if (info != CUBLAS_STATUS_SUCCESS) {
    std::ostringstream err;
    err << "cublasCgemm failed with status " << info << ".";
    throw std::runtime_error (err.str ());
  }
#else // NOT KOKKOS_ENABLE_CUDA
  throw std::runtime_error ("You must enable CUDA in your Trilinos build in "
                            "order to invoke cuBLAS functions in Tpetra.");
#endif // KOKKOS_ENABLE_CUDA
}

void
dgemm (const char char_transA,
       const char char_transB,
       const int m,
       const int n,
       const int k,
       const double alpha,
       const double A[],
       const int lda,
       const double B[],
       const int ldb,
       const double beta,
       double C[],
       const int ldc)
{
#ifdef KOKKOS_ENABLE_CUDA
  ::cublasDgemm (char_transA, char_transB, m, n, k,
                 alpha, A, lda, B, ldb, beta, C, ldc);
  cublasStatus info = cublasGetError ();
  if (info != CUBLAS_STATUS_SUCCESS) {
    std::ostringstream err;
    err << "cublasDgemm failed with status " << info << ".";
    throw std::runtime_error (err.str ());
  }
#else // NOT KOKKOS_ENABLE_CUDA
  throw std::runtime_error ("You must enable CUDA in your Trilinos build in "
                            "order to invoke cuBLAS functions in Tpetra.");
#endif // KOKKOS_ENABLE_CUDA
}

void
sgemm (const char char_transA,
       const char char_transB,
       const int m,
       const int n,
       const int k,
       const float alpha,
       const float A[],
       const int lda,
       const float B[],
       const int ldb,
       const float beta,
       float C[],
       const int ldc)
{
#ifdef KOKKOS_ENABLE_CUDA
  ::cublasSgemm (char_transA, char_transB, m, n, k,
                 alpha, A, lda, B, ldb, beta, C, ldc);
  cublasStatus info = cublasGetError ();
  if (info != CUBLAS_STATUS_SUCCESS) {
    std::ostringstream err;
    err << "cublasSgemm failed with status " << info << ".";
    throw std::runtime_error (err.str ());
  }
#else // NOT KOKKOS_ENABLE_CUDA
  throw std::runtime_error ("You must enable CUDA in your Trilinos build in "
                            "order to invoke cuBLAS functions in Tpetra.");
#endif // KOKKOS_ENABLE_CUDA
}

void
zgemm (const char transA,
       const char transB,
       const int m,
       const int n,
       const int k,
       const Kokkos::complex<double>& alpha,
       const Kokkos::complex<double> A[],
       const int lda,
       const Kokkos::complex<double> B[],
       const int ldb,
       const Kokkos::complex<double>& beta,
       Kokkos::complex<double> C[],
       const int ldc)
{
#ifdef KOKKOS_ENABLE_CUDA
  const cuDoubleComplex alpha_c =
    make_cuDoubleComplex (alpha.real (), alpha.imag ());
  const cuDoubleComplex beta_c =
    make_cuDoubleComplex (beta.real (), beta.imag ());
  cublasZgemm (transA, transB,
               m, n, k,
               alpha_c, reinterpret_cast<const cuDoubleComplex*> (A), lda,
               reinterpret_cast<const cuDoubleComplex*> (B), ldb,
               beta_c, reinterpret_cast<cuDoubleComplex*> (C), ldc);
  cublasStatus info = cublasGetError ();
  if (info != CUBLAS_STATUS_SUCCESS) {
    std::ostringstream err;
    err << "cublasCgemm failed with status " << info << ".";
    throw std::runtime_error (err.str ());
  }
#else // NOT KOKKOS_ENABLE_CUDA
  throw std::runtime_error ("You must enable CUDA in your Trilinos build in "
                            "order to invoke cuBLAS functions in Tpetra.");
#endif // KOKKOS_ENABLE_CUDA
}

} // namespace Impl
} // namespace Cublas
} // namespace Blas
} // namespace Details
} // namespace Tpetra