/*
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* Copyright 2017 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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#include "dcn_calc_math.h"
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#define isNaN(number) ((number) != (number))
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/*
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* NOTE:
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* This file is gcc-parseable HW gospel, coming straight from HW engineers.
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*
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* It doesn't adhere to Linux kernel style and sometimes will do things in odd
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* ways. Unless there is something clearly wrong with it the code should
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* remain as-is as it provides us with a guarantee from HW that it is correct.
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*/
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float dcn_bw_mod(const float arg1, const float arg2)
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{
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if (isNaN(arg1))
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return arg2;
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if (isNaN(arg2))
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return arg1;
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return arg1 - arg1 * ((int) (arg1 / arg2));
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}
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float dcn_bw_min2(const float arg1, const float arg2)
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{
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if (isNaN(arg1))
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return arg2;
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if (isNaN(arg2))
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return arg1;
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return arg1 < arg2 ? arg1 : arg2;
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}
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unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2)
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{
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return arg1 > arg2 ? arg1 : arg2;
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}
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float dcn_bw_max2(const float arg1, const float arg2)
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{
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if (isNaN(arg1))
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return arg2;
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if (isNaN(arg2))
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return arg1;
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return arg1 > arg2 ? arg1 : arg2;
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}
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float dcn_bw_floor2(const float arg, const float significance)
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{
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if (significance == 0)
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return 0;
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return ((int) (arg / significance)) * significance;
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}
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float dcn_bw_floor(const float arg)
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{
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return ((int) (arg));
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}
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float dcn_bw_ceil(const float arg)
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{
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float flr = dcn_bw_floor2(arg, 1);
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return flr + 0.00001 >= arg ? arg : flr + 1;
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}
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float dcn_bw_ceil2(const float arg, const float significance)
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{
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float flr = dcn_bw_floor2(arg, significance);
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if (significance == 0)
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return 0;
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return flr + 0.00001 >= arg ? arg : flr + significance;
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}
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float dcn_bw_max3(float v1, float v2, float v3)
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{
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return v3 > dcn_bw_max2(v1, v2) ? v3 : dcn_bw_max2(v1, v2);
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}
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float dcn_bw_max5(float v1, float v2, float v3, float v4, float v5)
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{
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return dcn_bw_max3(v1, v2, v3) > dcn_bw_max2(v4, v5) ? dcn_bw_max3(v1, v2, v3) : dcn_bw_max2(v4, v5);
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}
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float dcn_bw_pow(float a, float exp)
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{
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float temp;
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/*ASSERT(exp == (int)exp);*/
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if ((int)exp == 0)
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return 1;
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temp = dcn_bw_pow(a, (int)(exp / 2));
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if (((int)exp % 2) == 0) {
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return temp * temp;
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} else {
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if ((int)exp > 0)
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return a * temp * temp;
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else
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return (temp * temp) / a;
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}
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}
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double dcn_bw_fabs(double a)
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{
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if (a > 0)
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return (a);
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else
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return (-a);
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}
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float dcn_bw_log(float a, float b)
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{
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int * const exp_ptr = (int *)(&a);
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int x = *exp_ptr;
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const int log_2 = ((x >> 23) & 255) - 128;
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x &= ~(255 << 23);
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x += 127 << 23;
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*exp_ptr = x;
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a = ((-1.0f / 3) * a + 2) * a - 2.0f / 3;
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if (b > 2.00001 || b < 1.99999)
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return (a + log_2) / dcn_bw_log(b, 2);
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else
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return (a + log_2);
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}
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