diag_pre_multiply.hpp

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#ifndef STAN_MATH_OPENCL_PRIM_DIAG_PRE_MULTIPLY_HPP
#define STAN_MATH_OPENCL_PRIM_DIAG_PRE_MULTIPLY_HPP
#ifdef STAN_OPENCL
#include <stan/math/opencl/kernel_generator.hpp>
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/err.hpp>
 
namespace stan {
namespace math {
 
template <typename T1, typename T2,
          require_all_kernel_expressions_and_none_scalar_t<T1, T2>* = nullptr>
inline auto diag_pre_multiply(const T1& m1, const T2& m2) {
  check_size_match("diag_pre_multiply", "m1.size()", m1.size(), "m2.rows()",
                   m2.rows());
  check_vector("diag_pre_multiply", "m1", m1);
  // we need to eval - the branches would otherwise return different types
  if (m1.cols() == 1) {
    return eval(elt_multiply(rowwise_broadcast(m1), m2));
  } else {
    return eval(elt_multiply(rowwise_broadcast(transpose(m1)), m2));
  }
}
}  // namespace math
}  // namespace stan
 
#endif
#endif