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/*
* Copyright 2017 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: AMD
*
*/
#include "dcn_calc_math.h"
#define isNaN(number) ((number) != (number))
/*
* NOTE:
* This file is gcc-parseable HW gospel, coming straight from HW engineers.
*
* It doesn't adhere to Linux kernel style and sometimes will do things in odd
* ways. Unless there is something clearly wrong with it the code should
* remain as-is as it provides us with a guarantee from HW that it is correct.
*/
float dcn_bw_mod(const float arg1, const float arg2)
{
if (isNaN(arg1))
return arg2;
if (isNaN(arg2))
return arg1;
return arg1 - arg1 * ((int) (arg1 / arg2));
}
float dcn_bw_min2(const float arg1, const float arg2)
{
if (isNaN(arg1))
return arg2;
if (isNaN(arg2))
return arg1;
return arg1 < arg2 ? arg1 : arg2;
}
unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2)
{
return arg1 > arg2 ? arg1 : arg2;
}
float dcn_bw_max2(const float arg1, const float arg2)
{
if (isNaN(arg1))
return arg2;
if (isNaN(arg2))
return arg1;
return arg1 > arg2 ? arg1 : arg2;
}
float dcn_bw_floor2(const float arg, const float significance)
{
if (significance == 0)
return 0;
return ((int) (arg / significance)) * significance;
}
float dcn_bw_floor(const float arg)
{
return ((int) (arg));
}
float dcn_bw_ceil(const float arg)
{
float flr = dcn_bw_floor2(arg, 1);
return flr + 0.00001 >= arg ? arg : flr + 1;
}
float dcn_bw_ceil2(const float arg, const float significance)
{
float flr = dcn_bw_floor2(arg, significance);
if (significance == 0)
return 0;
return flr + 0.00001 >= arg ? arg : flr + significance;
}
float dcn_bw_max3(float v1, float v2, float v3)
{
return v3 > dcn_bw_max2(v1, v2) ? v3 : dcn_bw_max2(v1, v2);
}
float dcn_bw_max5(float v1, float v2, float v3, float v4, float v5)
{
return dcn_bw_max3(v1, v2, v3) > dcn_bw_max2(v4, v5) ? dcn_bw_max3(v1, v2, v3) : dcn_bw_max2(v4, v5);
}
float dcn_bw_pow(float a, float exp)
{
float temp;
/*ASSERT(exp == (int)exp);*/
if ((int)exp == 0)
return 1;
temp = dcn_bw_pow(a, (int)(exp / 2));
if (((int)exp % 2) == 0) {
return temp * temp;
} else {
if ((int)exp > 0)
return a * temp * temp;
else
return (temp * temp) / a;
}
}
double dcn_bw_fabs(double a)
{
if (a > 0)
return (a);
else
return (-a);
}
float dcn_bw_log(float a, float b)
{
int * const exp_ptr = (int *)(&a);
int x = *exp_ptr;
const int log_2 = ((x >> 23) & 255) - 128;
x &= ~(255 << 23);
x += 127 << 23;
*exp_ptr = x;
a = ((-1.0f / 3) * a + 2) * a - 2.0f / 3;
if (b > 2.00001 || b < 1.99999)
return (a + log_2) / dcn_bw_log(b, 2);
else
return (a + log_2);
}
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