| /* |
| * Copyright 2017 Advanced Micro Devices, Inc. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| * |
| * Authors: AMD |
| * |
| */ |
| |
| #include "dcn_calc_math.h" |
| |
| #define isNaN(number) ((number) != (number)) |
| |
| /* |
| * NOTE: |
| * This file is gcc-parseable HW gospel, coming straight from HW engineers. |
| * |
| * It doesn't adhere to Linux kernel style and sometimes will do things in odd |
| * ways. Unless there is something clearly wrong with it the code should |
| * remain as-is as it provides us with a guarantee from HW that it is correct. |
| */ |
| |
| float dcn_bw_mod(const float arg1, const float arg2) |
| { |
| if (isNaN(arg1)) |
| return arg2; |
| if (isNaN(arg2)) |
| return arg1; |
| return arg1 - arg1 * ((int) (arg1 / arg2)); |
| } |
| |
| float dcn_bw_min2(const float arg1, const float arg2) |
| { |
| if (isNaN(arg1)) |
| return arg2; |
| if (isNaN(arg2)) |
| return arg1; |
| return arg1 < arg2 ? arg1 : arg2; |
| } |
| |
| unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2) |
| { |
| return arg1 > arg2 ? arg1 : arg2; |
| } |
| float dcn_bw_max2(const float arg1, const float arg2) |
| { |
| if (isNaN(arg1)) |
| return arg2; |
| if (isNaN(arg2)) |
| return arg1; |
| return arg1 > arg2 ? arg1 : arg2; |
| } |
| |
| float dcn_bw_floor2(const float arg, const float significance) |
| { |
| if (significance == 0) |
| return 0; |
| return ((int) (arg / significance)) * significance; |
| } |
| float dcn_bw_floor(const float arg) |
| { |
| return ((int) (arg)); |
| } |
| |
| float dcn_bw_ceil(const float arg) |
| { |
| float flr = dcn_bw_floor2(arg, 1); |
| |
| return flr + 0.00001 >= arg ? arg : flr + 1; |
| } |
| |
| float dcn_bw_ceil2(const float arg, const float significance) |
| { |
| float flr = dcn_bw_floor2(arg, significance); |
| if (significance == 0) |
| return 0; |
| return flr + 0.00001 >= arg ? arg : flr + significance; |
| } |
| |
| float dcn_bw_max3(float v1, float v2, float v3) |
| { |
| return v3 > dcn_bw_max2(v1, v2) ? v3 : dcn_bw_max2(v1, v2); |
| } |
| |
| float dcn_bw_max5(float v1, float v2, float v3, float v4, float v5) |
| { |
| return dcn_bw_max3(v1, v2, v3) > dcn_bw_max2(v4, v5) ? dcn_bw_max3(v1, v2, v3) : dcn_bw_max2(v4, v5); |
| } |
| |
| float dcn_bw_pow(float a, float exp) |
| { |
| float temp; |
| /*ASSERT(exp == (int)exp);*/ |
| if ((int)exp == 0) |
| return 1; |
| temp = dcn_bw_pow(a, (int)(exp / 2)); |
| if (((int)exp % 2) == 0) { |
| return temp * temp; |
| } else { |
| if ((int)exp > 0) |
| return a * temp * temp; |
| else |
| return (temp * temp) / a; |
| } |
| } |
| |
| double dcn_bw_fabs(double a) |
| { |
| if (a > 0) |
| return (a); |
| else |
| return (-a); |
| } |
| |
| |
| float dcn_bw_log(float a, float b) |
| { |
| int * const exp_ptr = (int *)(&a); |
| int x = *exp_ptr; |
| const int log_2 = ((x >> 23) & 255) - 128; |
| x &= ~(255 << 23); |
| x += 127 << 23; |
| *exp_ptr = x; |
| |
| a = ((-1.0f / 3) * a + 2) * a - 2.0f / 3; |
| |
| if (b > 2.00001 || b < 1.99999) |
| return (a + log_2) / dcn_bw_log(b, 2); |
| else |
| return (a + log_2); |
| } |