1 /* 2 * Copyright 2017 Advanced Micro Devices, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: AMD 23 * 24 */ 25 26 #include "dcn_calc_math.h" 27 28 #define isNaN(number) ((number) != (number)) 29 30 /* 31 * NOTE: 32 * This file is gcc-parseable HW gospel, coming straight from HW engineers. 33 * 34 * It doesn't adhere to Linux kernel style and sometimes will do things in odd 35 * ways. Unless there is something clearly wrong with it the code should 36 * remain as-is as it provides us with a guarantee from HW that it is correct. 37 */ 38 39 float dcn_bw_mod(const float arg1, const float arg2) 40 { 41 if (isNaN(arg1)) 42 return arg2; 43 if (isNaN(arg2)) 44 return arg1; 45 return arg1 - arg1 * ((int) (arg1 / arg2)); 46 } 47 48 float dcn_bw_min2(const float arg1, const float arg2) 49 { 50 if (isNaN(arg1)) 51 return arg2; 52 if (isNaN(arg2)) 53 return arg1; 54 return arg1 < arg2 ? arg1 : arg2; 55 } 56 57 unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2) 58 { 59 return arg1 > arg2 ? arg1 : arg2; 60 } 61 float dcn_bw_max2(const float arg1, const float arg2) 62 { 63 if (isNaN(arg1)) 64 return arg2; 65 if (isNaN(arg2)) 66 return arg1; 67 return arg1 > arg2 ? arg1 : arg2; 68 } 69 70 float dcn_bw_floor2(const float arg, const float significance) 71 { 72 if (significance == 0) 73 return 0; 74 return ((int) (arg / significance)) * significance; 75 } 76 77 float dcn_bw_ceil2(const float arg, const float significance) 78 { 79 float flr = dcn_bw_floor2(arg, significance); 80 if (significance == 0) 81 return 0; 82 return flr + 0.00001 >= arg ? arg : flr + significance; 83 } 84 85 float dcn_bw_max3(float v1, float v2, float v3) 86 { 87 return v3 > dcn_bw_max2(v1, v2) ? v3 : dcn_bw_max2(v1, v2); 88 } 89 90 float dcn_bw_max5(float v1, float v2, float v3, float v4, float v5) 91 { 92 return dcn_bw_max3(v1, v2, v3) > dcn_bw_max2(v4, v5) ? dcn_bw_max3(v1, v2, v3) : dcn_bw_max2(v4, v5); 93 } 94 95 float dcn_bw_pow(float a, float exp) 96 { 97 float temp; 98 /*ASSERT(exp == (int)exp);*/ 99 if ((int)exp == 0) 100 return 1; 101 temp = dcn_bw_pow(a, (int)(exp / 2)); 102 if (((int)exp % 2) == 0) { 103 return temp * temp; 104 } else { 105 if ((int)exp > 0) 106 return a * temp * temp; 107 else 108 return (temp * temp) / a; 109 } 110 } 111 112 float dcn_bw_log(float a, float b) 113 { 114 int * const exp_ptr = (int *)(&a); 115 int x = *exp_ptr; 116 const int log_2 = ((x >> 23) & 255) - 128; 117 x &= ~(255 << 23); 118 x += 127 << 23; 119 *exp_ptr = x; 120 121 a = ((-1.0f / 3) * a + 2) * a - 2.0f / 3; 122 123 if (b > 2.00001 || b < 1.99999) 124 return (a + log_2) / dcn_bw_log(b, 2); 125 else 126 return (a + log_2); 127 } 128