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
dcn_bw_mod(const float arg1,const float arg2)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
dcn_bw_min2(const float arg1,const float arg2)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
dcn_bw_max(const unsigned int arg1,const unsigned int arg2)58 unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2)
59 {
60 return arg1 > arg2 ? arg1 : arg2;
61 }
dcn_bw_max2(const float arg1,const float arg2)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
dcn_bw_floor2(const float arg,const float significance)71 float dcn_bw_floor2(const float arg, const float significance)
72 {
73 ASSERT(significance != 0);
74
75 return ((int) (arg / significance)) * significance;
76 }
dcn_bw_floor(const float arg)77 float dcn_bw_floor(const float arg)
78 {
79 return ((int) (arg));
80 }
81
dcn_bw_ceil(const float arg)82 float dcn_bw_ceil(const float arg)
83 {
84 return (int) (arg + 0.99999);
85 }
86
dcn_bw_ceil2(const float arg,const float significance)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
dcn_bw_max3(float v1,float v2,float v3)94 float dcn_bw_max3(float v1, float v2, float v3)
95 {
96 return v3 > dcn_bw_max2(v1, v2) ? v3 : dcn_bw_max2(v1, v2);
97 }
98
dcn_bw_max5(float v1,float v2,float v3,float v4,float v5)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(v4, v5) ? dcn_bw_max3(v1, v2, v3) : dcn_bw_max2(v4, v5);
102 }
103
dcn_bw_pow(float a,float exp)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, (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
dcn_bw_fabs(double a)121 double dcn_bw_fabs(double a)
122 {
123 if (a > 0)
124 return (a);
125 else
126 return (-a);
127 }
128
129
dcn_bw_log(float a,float b)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(b, 2);
143 else
144 return (a + log_2);
145 }
146