2 * Copyright 2017 Advanced Micro Devices, Inc.
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9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
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15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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26 #include "dcn_calc_math.h"
28 #define isNaN(number) ((number) != (number))
32 * This file is gcc-parseable HW gospel, coming straight from HW engineers.
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.
39 float dcn_bw_mod(const float arg1, const float arg2)
45 return arg1 - arg1 * ((int) (arg1 / arg2));
48 float dcn_bw_min2(const float arg1, const float arg2)
54 return arg1 < arg2 ? arg1 : arg2;
57 unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2)
59 return arg1 > arg2 ? arg1 : arg2;
61 float dcn_bw_max2(const float arg1, const float arg2)
67 return arg1 > arg2 ? arg1 : arg2;
70 float dcn_bw_floor2(const float arg, const float significance)
72 if (significance == 0)
74 return ((int) (arg / significance)) * significance;
77 float dcn_bw_ceil2(const float arg, const float significance)
79 float flr = dcn_bw_floor2(arg, significance);
80 if (significance == 0)
82 return flr + 0.00001 >= arg ? arg : flr + significance;
85 float dcn_bw_max3(float v1, float v2, float v3)
87 return v3 > dcn_bw_max2(v1, v2) ? v3 : dcn_bw_max2(v1, v2);
90 float dcn_bw_max5(float v1, float v2, float v3, float v4, float v5)
92 return dcn_bw_max3(v1, v2, v3) > dcn_bw_max2(v4, v5) ? dcn_bw_max3(v1, v2, v3) : dcn_bw_max2(v4, v5);
95 float dcn_bw_pow(float a, float exp)
98 /*ASSERT(exp == (int)exp);*/
101 temp = dcn_bw_pow(a, (int)(exp / 2));
102 if (((int)exp % 2) == 0) {
106 return a * temp * temp;
108 return (temp * temp) / a;
112 float dcn_bw_log(float a, float b)
114 int * const exp_ptr = (int *)(&a);
116 const int log_2 = ((x >> 23) & 255) - 128;
121 a = ((-1.0f / 3) * a + 2) * a - 2.0f / 3;
123 if (b > 2.00001 || b < 1.99999)
124 return (a + log_2) / dcn_bw_log(b, 2);