467 lines
9.3 KiB
C
467 lines
9.3 KiB
C
/*
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* Copyright 2012-15 Advanced Micro Devices, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: AMD
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*
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*/
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#ifndef __DAL_FIXED31_32_H__
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#define __DAL_FIXED31_32_H__
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#include "os_types.h"
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#define FIXED31_32_BITS_PER_FRACTIONAL_PART 32
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/*
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* @brief
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* Arithmetic operations on real numbers
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* represented as fixed-point numbers.
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* There are: 1 bit for sign,
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* 31 bit for integer part,
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* 32 bits for fractional part.
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*
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* @note
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* Currently, overflows and underflows are asserted;
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* no special result returned.
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*/
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struct fixed31_32 {
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int64_t value;
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};
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/*
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* @brief
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* Useful constants
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*/
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static const struct fixed31_32 dal_fixed31_32_zero = { 0 };
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static const struct fixed31_32 dal_fixed31_32_epsilon = { 1LL };
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static const struct fixed31_32 dal_fixed31_32_half = { 0x80000000LL };
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static const struct fixed31_32 dal_fixed31_32_one = { 0x100000000LL };
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static const struct fixed31_32 dal_fixed31_32_pi = { 13493037705LL };
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static const struct fixed31_32 dal_fixed31_32_two_pi = { 26986075409LL };
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static const struct fixed31_32 dal_fixed31_32_e = { 11674931555LL };
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static const struct fixed31_32 dal_fixed31_32_ln2 = { 2977044471LL };
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static const struct fixed31_32 dal_fixed31_32_ln2_div_2 = { 1488522236LL };
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/*
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* @brief
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* Initialization routines
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*/
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/*
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* @brief
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* result = numerator / denominator
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*/
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struct fixed31_32 dal_fixed31_32_from_fraction(
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int64_t numerator,
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int64_t denominator);
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/*
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* @brief
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* result = arg
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*/
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struct fixed31_32 dal_fixed31_32_from_int_nonconst(int64_t arg);
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static inline struct fixed31_32 dal_fixed31_32_from_int(int64_t arg)
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{
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if (__builtin_constant_p(arg)) {
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struct fixed31_32 res;
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BUILD_BUG_ON((LONG_MIN > arg) || (arg > LONG_MAX));
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res.value = arg << FIXED31_32_BITS_PER_FRACTIONAL_PART;
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return res;
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} else
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return dal_fixed31_32_from_int_nonconst(arg);
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}
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/*
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* @brief
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* Unary operators
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*/
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/*
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* @brief
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* result = -arg
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*/
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static inline struct fixed31_32 dal_fixed31_32_neg(struct fixed31_32 arg)
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{
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struct fixed31_32 res;
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res.value = -arg.value;
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return res;
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}
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/*
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* @brief
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* result = abs(arg) := (arg >= 0) ? arg : -arg
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*/
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static inline struct fixed31_32 dal_fixed31_32_abs(struct fixed31_32 arg)
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{
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if (arg.value < 0)
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return dal_fixed31_32_neg(arg);
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else
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return arg;
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}
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/*
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* @brief
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* Binary relational operators
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*/
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/*
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* @brief
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* result = arg1 < arg2
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*/
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static inline bool dal_fixed31_32_lt(struct fixed31_32 arg1,
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struct fixed31_32 arg2)
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{
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return arg1.value < arg2.value;
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}
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/*
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* @brief
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* result = arg1 <= arg2
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*/
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static inline bool dal_fixed31_32_le(struct fixed31_32 arg1,
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struct fixed31_32 arg2)
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{
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return arg1.value <= arg2.value;
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}
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/*
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* @brief
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* result = arg1 == arg2
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*/
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static inline bool dal_fixed31_32_eq(struct fixed31_32 arg1,
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struct fixed31_32 arg2)
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{
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return arg1.value == arg2.value;
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}
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/*
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* @brief
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* result = min(arg1, arg2) := (arg1 <= arg2) ? arg1 : arg2
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*/
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static inline struct fixed31_32 dal_fixed31_32_min(struct fixed31_32 arg1,
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struct fixed31_32 arg2)
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{
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if (arg1.value <= arg2.value)
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return arg1;
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else
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return arg2;
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}
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/*
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* @brief
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* result = max(arg1, arg2) := (arg1 <= arg2) ? arg2 : arg1
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*/
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static inline struct fixed31_32 dal_fixed31_32_max(struct fixed31_32 arg1,
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struct fixed31_32 arg2)
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{
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if (arg1.value <= arg2.value)
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return arg2;
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else
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return arg1;
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}
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/*
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* @brief
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* | min_value, when arg <= min_value
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* result = | arg, when min_value < arg < max_value
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* | max_value, when arg >= max_value
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*/
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static inline struct fixed31_32 dal_fixed31_32_clamp(
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struct fixed31_32 arg,
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struct fixed31_32 min_value,
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struct fixed31_32 max_value)
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{
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if (dal_fixed31_32_le(arg, min_value))
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return min_value;
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else if (dal_fixed31_32_le(max_value, arg))
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return max_value;
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else
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return arg;
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}
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/*
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* @brief
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* Binary shift operators
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*/
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/*
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* @brief
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* result = arg << shift
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*/
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struct fixed31_32 dal_fixed31_32_shl(
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struct fixed31_32 arg,
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uint8_t shift);
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/*
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* @brief
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* result = arg >> shift
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*/
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static inline struct fixed31_32 dal_fixed31_32_shr(
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struct fixed31_32 arg,
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uint8_t shift)
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{
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struct fixed31_32 res;
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res.value = arg.value >> shift;
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return res;
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}
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/*
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* @brief
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* Binary additive operators
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*/
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/*
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* @brief
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* result = arg1 + arg2
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*/
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struct fixed31_32 dal_fixed31_32_add(
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struct fixed31_32 arg1,
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struct fixed31_32 arg2);
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/*
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* @brief
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* result = arg1 + arg2
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*/
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static inline struct fixed31_32 dal_fixed31_32_add_int(struct fixed31_32 arg1,
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int32_t arg2)
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{
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return dal_fixed31_32_add(arg1,
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dal_fixed31_32_from_int(arg2));
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}
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/*
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* @brief
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* result = arg1 - arg2
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*/
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struct fixed31_32 dal_fixed31_32_sub(
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struct fixed31_32 arg1,
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struct fixed31_32 arg2);
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/*
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* @brief
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* result = arg1 - arg2
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*/
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static inline struct fixed31_32 dal_fixed31_32_sub_int(struct fixed31_32 arg1,
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int32_t arg2)
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{
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return dal_fixed31_32_sub(arg1,
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dal_fixed31_32_from_int(arg2));
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}
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/*
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* @brief
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* Binary multiplicative operators
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*/
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/*
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* @brief
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* result = arg1 * arg2
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*/
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struct fixed31_32 dal_fixed31_32_mul(
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struct fixed31_32 arg1,
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struct fixed31_32 arg2);
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/*
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* @brief
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* result = arg1 * arg2
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*/
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static inline struct fixed31_32 dal_fixed31_32_mul_int(struct fixed31_32 arg1,
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int32_t arg2)
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{
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return dal_fixed31_32_mul(arg1,
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dal_fixed31_32_from_int(arg2));
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}
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/*
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* @brief
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* result = square(arg) := arg * arg
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*/
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struct fixed31_32 dal_fixed31_32_sqr(
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struct fixed31_32 arg);
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/*
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* @brief
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* result = arg1 / arg2
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*/
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static inline struct fixed31_32 dal_fixed31_32_div_int(struct fixed31_32 arg1,
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int64_t arg2)
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{
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return dal_fixed31_32_from_fraction(arg1.value,
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dal_fixed31_32_from_int(arg2).value);
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}
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/*
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* @brief
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* result = arg1 / arg2
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*/
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static inline struct fixed31_32 dal_fixed31_32_div(struct fixed31_32 arg1,
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struct fixed31_32 arg2)
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{
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return dal_fixed31_32_from_fraction(arg1.value,
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arg2.value);
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}
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/*
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* @brief
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* Reciprocal function
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*/
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/*
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* @brief
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* result = reciprocal(arg) := 1 / arg
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*
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* @note
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* No special actions taken in case argument is zero.
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*/
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struct fixed31_32 dal_fixed31_32_recip(
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struct fixed31_32 arg);
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/*
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* @brief
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* Trigonometric functions
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*/
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/*
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* @brief
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* result = sinc(arg) := sin(arg) / arg
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*
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* @note
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* Argument specified in radians,
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* internally it's normalized to [-2pi...2pi] range.
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*/
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struct fixed31_32 dal_fixed31_32_sinc(
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struct fixed31_32 arg);
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/*
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* @brief
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* result = sin(arg)
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*
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* @note
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* Argument specified in radians,
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* internally it's normalized to [-2pi...2pi] range.
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*/
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struct fixed31_32 dal_fixed31_32_sin(
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struct fixed31_32 arg);
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/*
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* @brief
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* result = cos(arg)
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*
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* @note
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* Argument specified in radians
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* and should be in [-2pi...2pi] range -
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* passing arguments outside that range
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* will cause incorrect result!
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*/
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struct fixed31_32 dal_fixed31_32_cos(
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struct fixed31_32 arg);
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/*
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* @brief
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* Transcendent functions
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*/
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/*
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* @brief
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* result = exp(arg)
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*
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* @note
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* Currently, function is verified for abs(arg) <= 1.
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*/
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struct fixed31_32 dal_fixed31_32_exp(
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struct fixed31_32 arg);
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/*
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* @brief
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* result = log(arg)
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*
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* @note
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* Currently, abs(arg) should be less than 1.
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* No normalization is done.
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* Currently, no special actions taken
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* in case of invalid argument(s). Take care!
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*/
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struct fixed31_32 dal_fixed31_32_log(
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struct fixed31_32 arg);
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/*
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* @brief
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* Power function
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*/
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/*
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* @brief
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* result = pow(arg1, arg2)
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*
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* @note
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* Currently, abs(arg1) should be less than 1. Take care!
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*/
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struct fixed31_32 dal_fixed31_32_pow(
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struct fixed31_32 arg1,
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struct fixed31_32 arg2);
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/*
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* @brief
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* Rounding functions
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*/
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/*
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* @brief
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* result = floor(arg) := greatest integer lower than or equal to arg
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*/
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int32_t dal_fixed31_32_floor(
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struct fixed31_32 arg);
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/*
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* @brief
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* result = round(arg) := integer nearest to arg
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*/
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int32_t dal_fixed31_32_round(
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struct fixed31_32 arg);
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/*
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* @brief
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* result = ceil(arg) := lowest integer greater than or equal to arg
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*/
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int32_t dal_fixed31_32_ceil(
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struct fixed31_32 arg);
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/* the following two function are used in scaler hw programming to convert fixed
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* point value to format 2 bits from integer part and 19 bits from fractional
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* part. The same applies for u0d19, 0 bits from integer part and 19 bits from
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* fractional
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*/
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uint32_t dal_fixed31_32_u2d19(
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struct fixed31_32 arg);
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uint32_t dal_fixed31_32_u0d19(
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struct fixed31_32 arg);
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#endif
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