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/*
* Copyright 2012-15 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 "dm_services.h"
#include "include/fixed32_32.h"
static uint64_t u64_div(uint64_t n, uint64_t d)
{
uint32_t i = 0;
uint64_t r;
uint64_t q = div64_u64_rem(n, d, &r);
for (i = 0; i < 32; ++i) {
uint64_t sbit = q & (1ULL<<63);
r <<= 1;
r |= sbit ? 1 : 0;
q <<= 1;
if (r >= d) {
r -= d;
q |= 1;
}
}
if (2*r >= d)
q += 1;
return q;
}
struct fixed32_32 dal_fixed32_32_from_fraction(uint32_t n, uint32_t d)
{
struct fixed32_32 fx;
fx.value = u64_div((uint64_t)n << 32, (uint64_t)d << 32);
return fx;
}
struct fixed32_32 dal_fixed32_32_add(
struct fixed32_32 lhs,
struct fixed32_32 rhs)
{
struct fixed32_32 fx = {lhs.value + rhs.value};
ASSERT(fx.value >= rhs.value);
return fx;
}
struct fixed32_32 dal_fixed32_32_add_int(struct fixed32_32 lhs, uint32_t rhs)
{
struct fixed32_32 fx = {lhs.value + ((uint64_t)rhs << 32)};
ASSERT(fx.value >= (uint64_t)rhs << 32);
return fx;
}
struct fixed32_32 dal_fixed32_32_sub(
struct fixed32_32 lhs,
struct fixed32_32 rhs)
{
struct fixed32_32 fx;
ASSERT(lhs.value >= rhs.value);
fx.value = lhs.value - rhs.value;
return fx;
}
struct fixed32_32 dal_fixed32_32_sub_int(struct fixed32_32 lhs, uint32_t rhs)
{
struct fixed32_32 fx;
ASSERT(lhs.value >= ((uint64_t)rhs<<32));
fx.value = lhs.value - ((uint64_t)rhs<<32);
return fx;
}
struct fixed32_32 dal_fixed32_32_mul(
struct fixed32_32 lhs,
struct fixed32_32 rhs)
{
struct fixed32_32 fx;
uint64_t lhs_int = lhs.value>>32;
uint64_t lhs_frac = (uint32_t)lhs.value;
uint64_t rhs_int = rhs.value>>32;
uint64_t rhs_frac = (uint32_t)rhs.value;
uint64_t ahbh = lhs_int * rhs_int;
uint64_t ahbl = lhs_int * rhs_frac;
uint64_t albh = lhs_frac * rhs_int;
uint64_t albl = lhs_frac * rhs_frac;
ASSERT((ahbh>>32) == 0);
fx.value = (ahbh<<32) + ahbl + albh + (albl>>32);
return fx;
}
struct fixed32_32 dal_fixed32_32_mul_int(struct fixed32_32 lhs, uint32_t rhs)
{
struct fixed32_32 fx;
uint64_t lhsi = (lhs.value>>32) * (uint64_t)rhs;
uint64_t lhsf;
ASSERT((lhsi>>32) == 0);
lhsf = ((uint32_t)lhs.value) * (uint64_t)rhs;
ASSERT((lhsi<<32) + lhsf >= lhsf);
fx.value = (lhsi<<32) + lhsf;
return fx;
}
struct fixed32_32 dal_fixed32_32_div(
struct fixed32_32 lhs,
struct fixed32_32 rhs)
{
struct fixed32_32 fx;
fx.value = u64_div(lhs.value, rhs.value);
return fx;
}
struct fixed32_32 dal_fixed32_32_div_int(struct fixed32_32 lhs, uint32_t rhs)
{
struct fixed32_32 fx;
fx.value = u64_div(lhs.value, (uint64_t)rhs << 32);
return fx;
}
uint32_t dal_fixed32_32_ceil(struct fixed32_32 v)
{
ASSERT((uint32_t)v.value ? (v.value >> 32) + 1 >= 1 : true);
return (v.value>>32) + ((uint32_t)v.value ? 1 : 0);
}
uint32_t dal_fixed32_32_round(struct fixed32_32 v)
{
ASSERT(v.value + (1ULL<<31) >= (1ULL<<31));
return (v.value + (1ULL<<31))>>32;
}
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