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)
 32struct 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
 42static 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
 48static 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
 54static 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
 61static 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
 68struct bw_fixed bw_int_to_fixed_nonconst(int64_t value);
 69static 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
 80static inline int32_t bw_fixed_to_int(struct bw_fixed value)
 81{
 82	return BW_FIXED_GET_INTEGER_PART(value.value);
 83}
 84
 85struct bw_fixed bw_frc_to_fixed(int64_t num, int64_t denum);
 86
 87static 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
101static 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
111static 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
120struct bw_fixed bw_mul(const struct bw_fixed arg1, const struct bw_fixed arg2);
121static 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
126static 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
133struct bw_fixed bw_floor2(const struct bw_fixed arg, const struct bw_fixed significance);
134struct bw_fixed bw_ceil2(const struct bw_fixed arg, const struct bw_fixed significance);
135
136static inline bool bw_equ(const struct bw_fixed arg1, const struct bw_fixed arg2)
137{
138	return arg1.value == arg2.value;
139}
140
141static inline bool bw_neq(const struct bw_fixed arg1, const struct bw_fixed arg2)
142{
143	return arg1.value != arg2.value;
144}
145
146static inline bool bw_leq(const struct bw_fixed arg1, const struct bw_fixed arg2)
147{
148	return arg1.value <= arg2.value;
149}
150
151static inline bool bw_meq(const struct bw_fixed arg1, const struct bw_fixed arg2)
152{
153	return arg1.value >= arg2.value;
154}
155
156static inline bool bw_ltn(const struct bw_fixed arg1, const struct bw_fixed arg2)
157{
158	return arg1.value < arg2.value;
159}
160
161static 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_