| // |
| // 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); |