gemm.cpp

#include <migraph/gpu/gemm.hpp>
#include <migraph/operators.hpp>
#include <migraph/manage_ptr.hpp>
#include <migraph/gpu/miopen.hpp>
#include <utility>

namespace migraph {
namespace gpu {

template <class... Ts>
void generic_rocblas_gemm(shape::as<float>, Ts&&... xs)
{
    rocblas_sgemm(std::forward<Ts>(xs)...);
}

template <class... Ts>
void generic_rocblas_gemm(shape::as<double>, Ts&&... xs)
{
    rocblas_dgemm(std::forward<Ts>(xs)...);
}

template <class... Ts>
void generic_rocblas_gemm(shape::as<half>, Ts&&... xs)
{
    rocblas_hgemm(std::forward<Ts>(xs)...);
}

template <class T, class... Ts>
void generic_rocblas_gemm(shape::as<T>, Ts&&...)
{
    MIGRAPH_THROW("Type unsupported by rocblas");
}

template <class T>
T to_rocblas_type(T x)
{
    return x;
}

rocblas_half to_rocblas_type(half x) { return reinterpret_cast<const rocblas_half&>(x); }

shape miopen_gemm::compute_shape(const std::vector<shape>& inputs) const
{
    check_shapes{inputs, *this}.has(3);
    return op.compute_shape({inputs.at(0), inputs.at(1)});
}
argument miopen_gemm::compute(context& ctx,
                              const shape& output_shape,
                              const std::vector<argument>& args) const
{
    float alpha     = 1.0f;
    float beta      = 0.0f;
    bool transa     = args[0].get_shape().transposed();
    bool transb     = args[1].get_shape().transposed();
    rocblas_int lda = args[0].get_shape().strides()[transa ? 1 : 0];
    rocblas_int ldb = args[1].get_shape().strides()[transb ? 1 : 0];
    rocblas_int ldc = args[2].get_shape().strides()[0];
    rocblas_int m   = output_shape.lens()[0];
    rocblas_int n   = output_shape.lens()[1];
    rocblas_int k   = args[0].get_shape().lens()[1];
    output_shape.visit_type([&](auto as) {
        auto alpha_r = to_rocblas_type(as(alpha));
        auto beta_r  = to_rocblas_type(as(beta));
        generic_rocblas_gemm(as,
                             ctx.get_stream().get_rocblas(),
                             transb ? rocblas_operation_transpose : rocblas_operation_none,
                             transa ? rocblas_operation_transpose : rocblas_operation_none,
                             n,
                             m,
                             k,
                             &alpha_r,
                             args[1].implicit(),
                             ldb,
                             args[0].implicit(),
                             lda,
                             &beta_r,
                             args[2].implicit(),
                             ldc);

    });
    return args[2];
}

} // namespace gpu

} // namespace migraph