Function fma

dnn/include/megdnn/dtype/bfloat16.hpp:1753–1755

Fused multiply add. \param x first operand \param y second operand \param z third operand \return ( \a x * \a y ) + \a z rounded as one operation. template typename enable ::type fma(T x, U y, V z) { return functions::fma(x, y, z); }

// z);
//}
MEGDNN_HOST MEGDNN_DEVICE inline expr fma(bfloat16 x, bfloat16 y, bfloat16 z) {
    return functions::fma(x, y, z);
}
MEGDNN_HOST MEGDNN_DEVICE inline expr fma(bfloat16 x, bfloat16 y, expr z) {
    return functions::fma(x, y, z);
}