//
// This confidential and proprietary software may be used only as
// authorised by a licensing agreement from ARM Limited
// (C) COPYRIGHT 2020-2024 ARM Limited
// ALL RIGHTS RESERVED
// The entire notice above must be reproduced on all authorised
// copies and copies may only be made to the extent permitted
// by a licensing agreement from ARM Limited.

int16_t tanh_reference(int16_t x) {  // input x range is -256 to +256 inclusive
    fp64_t v = (fp64_t)x/(fp64_t)32;
    v = exp(-2.0*v);
    v = (1.0-v)/(1.0+v);
    return round_to_nearest_int(32768.0 * v);
}

generate_lookup_table(&tanh_table, &tanh_reference);