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
dcn_bw_mod(const float arg1,const float arg2)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
dcn_bw_min2(const float arg1,const float arg2)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
dcn_bw_max(const unsigned int arg1,const unsigned int arg2)57 unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2)
58 {
59 return arg1 > arg2 ? arg1 : arg2;
60 }
dcn_bw_max2(const float arg1,const float arg2)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
dcn_bw_floor2(const float arg,const float significance)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 }
dcn_bw_floor(const float arg)76 float dcn_bw_floor(const float arg)
77 {
78 return ((int) (arg));
79 }
80
dcn_bw_ceil(const float arg)81 float dcn_bw_ceil(const float arg)
82 {
83 float flr = dcn_bw_floor2(arg, 1);
84
85 return flr + 0.00001 >= arg ? arg : flr + 1;
86 }
87
dcn_bw_ceil2(const float arg,const float significance)88 float dcn_bw_ceil2(const float arg, const float significance)
89 {
90 float flr = dcn_bw_floor2(arg, significance);
91 if (significance == 0)
92 return 0;
93 return flr + 0.00001 >= arg ? arg : flr + significance;
94 }
95
dcn_bw_max3(float v1,float v2,float v3)96 float dcn_bw_max3(float v1, float v2, float v3)
97 {
98 return v3 > dcn_bw_max2(v1, v2) ? v3 : dcn_bw_max2(v1, v2);
99 }
100
dcn_bw_max5(float v1,float v2,float v3,float v4,float v5)101 float dcn_bw_max5(float v1, float v2, float v3, float v4, float v5)
102 {
103 return dcn_bw_max3(v1, v2, v3) > dcn_bw_max2(v4, v5) ? dcn_bw_max3(v1, v2, v3) : dcn_bw_max2(v4, v5);
104 }
105
dcn_bw_pow(float a,float exp)106 float dcn_bw_pow(float a, float exp)
107 {
108 float temp;
109 /*ASSERT(exp == (int)exp);*/
110 if ((int)exp == 0)
111 return 1;
112 temp = dcn_bw_pow(a, (int)(exp / 2));
113 if (((int)exp % 2) == 0) {
114 return temp * temp;
115 } else {
116 if ((int)exp > 0)
117 return a * temp * temp;
118 else
119 return (temp * temp) / a;
120 }
121 }
122
dcn_bw_fabs(double a)123 double dcn_bw_fabs(double a)
124 {
125 if (a > 0)
126 return (a);
127 else
128 return (-a);
129 }
130
131
dcn_bw_log(float a,float b)132 float dcn_bw_log(float a, float b)
133 {
134 int * const exp_ptr = (int *)(&a);
135 int x = *exp_ptr;
136 const int log_2 = ((x >> 23) & 255) - 128;
137 x &= ~(255 << 23);
138 x += 127 << 23;
139 *exp_ptr = x;
140
141 a = ((-1.0f / 3) * a + 2) * a - 2.0f / 3;
142
143 if (b > 2.00001 || b < 1.99999)
144 return (a + log_2) / dcn_bw_log(b, 2);
145 else
146 return (a + log_2);
147 }
148