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      1 /*	$NetBSD: amdgpu_dcn_calc_math.c,v 1.2 2021/12/18 23:45:01 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2017 Advanced Micro Devices, Inc.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  * Authors: AMD
     25  *
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 __KERNEL_RCSID(0, "$NetBSD: amdgpu_dcn_calc_math.c,v 1.2 2021/12/18 23:45:01 riastradh Exp $");
     30 
     31 #include "dcn_calc_math.h"
     32 
     33 #define isNaN(number) ((number) != (number))
     34 
     35 /*
     36  * NOTE:
     37  *   This file is gcc-parseable HW gospel, coming straight from HW engineers.
     38  *
     39  * It doesn't adhere to Linux kernel style and sometimes will do things in odd
     40  * ways. Unless there is something clearly wrong with it the code should
     41  * remain as-is as it provides us with a guarantee from HW that it is correct.
     42  */
     43 
     44 float dcn_bw_mod(const float arg1, const float arg2)
     45 {
     46 	if (isNaN(arg1))
     47 		return arg2;
     48 	if (isNaN(arg2))
     49 		return arg1;
     50 	return arg1 - arg1 * ((int) (arg1 / arg2));
     51 }
     52 
     53 float dcn_bw_min2(const float arg1, const float arg2)
     54 {
     55 	if (isNaN(arg1))
     56 		return arg2;
     57 	if (isNaN(arg2))
     58 		return arg1;
     59 	return arg1 < arg2 ? arg1 : arg2;
     60 }
     61 
     62 unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2)
     63 {
     64 	return arg1 > arg2 ? arg1 : arg2;
     65 }
     66 float dcn_bw_max2(const float arg1, const float arg2)
     67 {
     68 	if (isNaN(arg1))
     69 		return arg2;
     70 	if (isNaN(arg2))
     71 		return arg1;
     72 	return arg1 > arg2 ? arg1 : arg2;
     73 }
     74 
     75 float dcn_bw_floor2(const float arg, const float significance)
     76 {
     77 	if (significance == 0)
     78 		return 0;
     79 	return ((int) (arg / significance)) * significance;
     80 }
     81 float dcn_bw_floor(const float arg)
     82 {
     83 	return ((int) (arg));
     84 }
     85 
     86 float dcn_bw_ceil(const float arg)
     87 {
     88 	float flr = dcn_bw_floor2(arg, 1);
     89 
     90 	return flr + 0.00001 >= arg ? arg : flr + 1;
     91 }
     92 
     93 float dcn_bw_ceil2(const float arg, const float significance)
     94 {
     95 	float flr = dcn_bw_floor2(arg, significance);
     96 	if (significance == 0)
     97 		return 0;
     98 	return flr + 0.00001 >= arg ? arg : flr + significance;
     99 }
    100 
    101 float dcn_bw_max3(float v1, float v2, float v3)
    102 {
    103 	return v3 > dcn_bw_max2(v1, v2) ? v3 : dcn_bw_max2(v1, v2);
    104 }
    105 
    106 float dcn_bw_max5(float v1, float v2, float v3, float v4, float v5)
    107 {
    108 	return dcn_bw_max3(v1, v2, v3) > dcn_bw_max2(v4, v5) ? dcn_bw_max3(v1, v2, v3) : dcn_bw_max2(v4, v5);
    109 }
    110 
    111 float dcn_bw_pow(float a, float exp)
    112 {
    113 	float temp;
    114 	/*ASSERT(exp == (int)exp);*/
    115 	if ((int)exp == 0)
    116 		return 1;
    117 	temp = dcn_bw_pow(a, (int)(exp / 2));
    118 	if (((int)exp % 2) == 0) {
    119 		return temp * temp;
    120 	} else {
    121 		if ((int)exp > 0)
    122 			return a * temp * temp;
    123 		else
    124 			return (temp * temp) / a;
    125 	}
    126 }
    127 
    128 double dcn_bw_fabs(double a)
    129 {
    130 	if (a > 0)
    131 		return (a);
    132 	else
    133 		return (-a);
    134 }
    135 
    136 
    137 float dcn_bw_log(float a, float b)
    138 {
    139 	int * const exp_ptr = (int *)(&a);
    140 	int x = *exp_ptr;
    141 	const int log_2 = ((x >> 23) & 255) - 128;
    142 	x &= ~(255 << 23);
    143 	x += 127 << 23;
    144 	*exp_ptr = x;
    145 
    146 	a = ((-1.0f / 3) * a + 2) * a - 2.0f / 3;
    147 
    148 	if (b > 2.00001 || b < 1.99999)
    149 		return (a + log_2) / dcn_bw_log(b, 2);
    150 	else
    151 		return (a + log_2);
    152 }
    153