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 "os_types.h" |
27 | #include "dcn_calc_math.h" |
28 | |
29 | #define isNaN(number) ((number) != (number)) |
30 | |
31 | /* |
32 | * NOTE: |
33 | * This file is gcc-parseable HW gospel, coming straight from HW engineers. |
34 | * |
35 | * It doesn't adhere to Linux kernel style and sometimes will do things in odd |
36 | * ways. Unless there is something clearly wrong with it the code should |
37 | * remain as-is as it provides us with a guarantee from HW that it is correct. |
38 | */ |
39 | |
40 | float dcn_bw_mod(const float arg1, const float arg2) |
41 | { |
42 | if (isNaN(arg1)) |
43 | return arg2; |
44 | if (isNaN(arg2)) |
45 | return arg1; |
46 | return arg1 - arg1 * ((int) (arg1 / arg2)); |
47 | } |
48 | |
49 | float dcn_bw_min2(const float arg1, const float arg2) |
50 | { |
51 | if (isNaN(arg1)) |
52 | return arg2; |
53 | if (isNaN(arg2)) |
54 | return arg1; |
55 | return arg1 < arg2 ? arg1 : arg2; |
56 | } |
57 | |
58 | unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2) |
59 | { |
60 | return arg1 > arg2 ? arg1 : arg2; |
61 | } |
62 | float dcn_bw_max2(const float arg1, const float arg2) |
63 | { |
64 | if (isNaN(arg1)) |
65 | return arg2; |
66 | if (isNaN(arg2)) |
67 | return arg1; |
68 | return arg1 > arg2 ? arg1 : arg2; |
69 | } |
70 | |
71 | float dcn_bw_floor2(const float arg, const float significance) |
72 | { |
73 | ASSERT(significance != 0); |
74 | |
75 | return ((int) (arg / significance)) * significance; |
76 | } |
77 | float dcn_bw_floor(const float arg) |
78 | { |
79 | return ((int) (arg)); |
80 | } |
81 | |
82 | float dcn_bw_ceil(const float arg) |
83 | { |
84 | return (int) (arg + 0.99999); |
85 | } |
86 | |
87 | float dcn_bw_ceil2(const float arg, const float significance) |
88 | { |
89 | ASSERT(significance != 0); |
90 | |
91 | return ((int) (arg / significance + 0.99999)) * significance; |
92 | } |
93 | |
94 | float dcn_bw_max3(float v1, float v2, float v3) |
95 | { |
96 | return v3 > dcn_bw_max2(arg1: v1, arg2: v2) ? v3 : dcn_bw_max2(arg1: v1, arg2: v2); |
97 | } |
98 | |
99 | float dcn_bw_max5(float v1, float v2, float v3, float v4, float v5) |
100 | { |
101 | return dcn_bw_max3(v1, v2, v3) > dcn_bw_max2(arg1: v4, arg2: v5) ? dcn_bw_max3(v1, v2, v3) : dcn_bw_max2(arg1: v4, arg2: v5); |
102 | } |
103 | |
104 | float dcn_bw_pow(float a, float exp) |
105 | { |
106 | float temp; |
107 | /*ASSERT(exp == (int)exp);*/ |
108 | if ((int)exp == 0) |
109 | return 1; |
110 | temp = dcn_bw_pow(a, exp: (int)(exp / 2)); |
111 | if (((int)exp % 2) == 0) { |
112 | return temp * temp; |
113 | } else { |
114 | if ((int)exp > 0) |
115 | return a * temp * temp; |
116 | else |
117 | return (temp * temp) / a; |
118 | } |
119 | } |
120 | |
121 | double dcn_bw_fabs(double a) |
122 | { |
123 | if (a > 0) |
124 | return (a); |
125 | else |
126 | return (-a); |
127 | } |
128 | |
129 | |
130 | float dcn_bw_log(float a, float b) |
131 | { |
132 | int * const exp_ptr = (int *)(&a); |
133 | int x = *exp_ptr; |
134 | const int log_2 = ((x >> 23) & 255) - 128; |
135 | x &= ~(255 << 23); |
136 | x += 127 << 23; |
137 | *exp_ptr = x; |
138 | |
139 | a = ((-1.0f / 3) * a + 2) * a - 2.0f / 3; |
140 | |
141 | if (b > 2.00001 || b < 1.99999) |
142 | return (a + log_2) / dcn_bw_log(a: b, b: 2); |
143 | else |
144 | return (a + log_2); |
145 | } |
146 | |