1 /*
2  * Copyright 2015 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 #ifndef BW_FIXED_H_
27 #define BW_FIXED_H_
28 
29 #define BW_FIXED_BITS_PER_FRACTIONAL_PART 24
30 
31 #define BW_FIXED_GET_INTEGER_PART(x) ((x) >> BW_FIXED_BITS_PER_FRACTIONAL_PART)
32 struct bw_fixed {
33 	int64_t value;
34 };
35 
36 #define BW_FIXED_MIN_I32 \
37 	(int64_t)(-(1LL << (63 - BW_FIXED_BITS_PER_FRACTIONAL_PART)))
38 
39 #define BW_FIXED_MAX_I32 \
40 	(int64_t)((1ULL << (63 - BW_FIXED_BITS_PER_FRACTIONAL_PART)) - 1)
41 
42 static inline struct bw_fixed bw_min2(const struct bw_fixed arg1,
43 				      const struct bw_fixed arg2)
44 {
45 	return (arg1.value <= arg2.value) ? arg1 : arg2;
46 }
47 
48 static inline struct bw_fixed bw_max2(const struct bw_fixed arg1,
49 				      const struct bw_fixed arg2)
50 {
51 	return (arg2.value <= arg1.value) ? arg1 : arg2;
52 }
53 
54 static inline struct bw_fixed bw_min3(struct bw_fixed v1,
55 				      struct bw_fixed v2,
56 				      struct bw_fixed v3)
57 {
58 	return bw_min2(bw_min2(v1, v2), v3);
59 }
60 
61 static inline struct bw_fixed bw_max3(struct bw_fixed v1,
62 				      struct bw_fixed v2,
63 				      struct bw_fixed v3)
64 {
65 	return bw_max2(bw_max2(v1, v2), v3);
66 }
67 
68 struct bw_fixed bw_int_to_fixed_nonconst(int64_t value);
69 static inline struct bw_fixed bw_int_to_fixed(int64_t value)
70 {
71 	if (__builtin_constant_p(value)) {
72 		struct bw_fixed res;
73 		BUILD_BUG_ON(value > BW_FIXED_MAX_I32 || value < BW_FIXED_MIN_I32);
74 		res.value = value << BW_FIXED_BITS_PER_FRACTIONAL_PART;
75 		return res;
76 	} else
77 		return bw_int_to_fixed_nonconst(value);
78 }
79 
80 static inline int32_t bw_fixed_to_int(struct bw_fixed value)
81 {
82 	return BW_FIXED_GET_INTEGER_PART(value.value);
83 }
84 
85 struct bw_fixed bw_frc_to_fixed(int64_t num, int64_t denum);
86 
87 static inline struct bw_fixed fixed31_32_to_bw_fixed(int64_t raw)
88 {
89 	struct bw_fixed result = { 0 };
90 
91 	if (raw < 0) {
92 		raw = -raw;
93 		result.value = -(raw >> (32 - BW_FIXED_BITS_PER_FRACTIONAL_PART));
94 	} else {
95 		result.value = raw >> (32 - BW_FIXED_BITS_PER_FRACTIONAL_PART);
96 	}
97 
98 	return result;
99 }
100 
101 static inline struct bw_fixed bw_add(const struct bw_fixed arg1,
102 				     const struct bw_fixed arg2)
103 {
104 	struct bw_fixed res;
105 
106 	res.value = arg1.value + arg2.value;
107 
108 	return res;
109 }
110 
111 static inline struct bw_fixed bw_sub(const struct bw_fixed arg1, const struct bw_fixed arg2)
112 {
113 	struct bw_fixed res;
114 
115 	res.value = arg1.value - arg2.value;
116 
117 	return res;
118 }
119 
120 struct bw_fixed bw_mul(const struct bw_fixed arg1, const struct bw_fixed arg2);
121 static inline struct bw_fixed bw_div(const struct bw_fixed arg1, const struct bw_fixed arg2)
122 {
123 	return bw_frc_to_fixed(arg1.value, arg2.value);
124 }
125 
126 static inline struct bw_fixed bw_mod(const struct bw_fixed arg1, const struct bw_fixed arg2)
127 {
128 	struct bw_fixed res;
129 	div64_u64_rem(arg1.value, arg2.value, (uint64_t *)&res.value);
130 	return res;
131 }
132 
133 struct bw_fixed bw_floor2(const struct bw_fixed arg, const struct bw_fixed significance);
134 struct bw_fixed bw_ceil2(const struct bw_fixed arg, const struct bw_fixed significance);
135 
136 static inline bool bw_equ(const struct bw_fixed arg1, const struct bw_fixed arg2)
137 {
138 	return arg1.value == arg2.value;
139 }
140 
141 static inline bool bw_neq(const struct bw_fixed arg1, const struct bw_fixed arg2)
142 {
143 	return arg1.value != arg2.value;
144 }
145 
146 static inline bool bw_leq(const struct bw_fixed arg1, const struct bw_fixed arg2)
147 {
148 	return arg1.value <= arg2.value;
149 }
150 
151 static inline bool bw_meq(const struct bw_fixed arg1, const struct bw_fixed arg2)
152 {
153 	return arg1.value >= arg2.value;
154 }
155 
156 static inline bool bw_ltn(const struct bw_fixed arg1, const struct bw_fixed arg2)
157 {
158 	return arg1.value < arg2.value;
159 }
160 
161 static inline bool bw_mtn(const struct bw_fixed arg1, const struct bw_fixed arg2)
162 {
163 	return arg1.value > arg2.value;
164 }
165 
166 #endif //BW_FIXED_H_
167