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@Pharap
Created January 21, 2018 21:38
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Save Pharap/eee392c7a1189d6b7c77c765964a44a7 to your computer and use it in GitHub Desktop.
Simple roundFixedHalfToEven implementation compatible with my FixedPoints library
/*
Copyright (C) 2018 Pharap (@Pharap)
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
template< unsigned Integer, unsigned Fraction > constexpr UFixed<Integer, Fraction> roundFixedHalfToEven(const UFixed<Integer, Fraction> & value)
{
using OutputType = UFixed<Integer, Fraction>;
return
((value.getInteger() & 1) != 0)
? ((value.getFraction() >= OutputType(0.5).getFraction()) ? ceilFixed(value) : floorFixed(value))
: ((value.getFraction() <= OutputType(0.5).getFraction()) ? floorFixed(value) : ceilFixed(value));
}
template< unsigned Integer, unsigned Fraction > constexpr SFixed<Integer, Fraction> roundFixedHalfToEven(const SFixed<Integer, Fraction> & value)
{
using OutputType = SFixed<Integer, Fraction>;
return
signbitFixed(value)
?
(
((value.getInteger() & 1) != 0)
? ((value.getFraction() >= OutputType(0.5).getFraction()) ? ceilFixed(value) : floorFixed(value))
: ((value.getFraction() <= OutputType(0.5).getFraction()) ? floorFixed(value) : ceilFixed(value))
)
:
(
((value.getInteger() & 1) != 0)
? ((value.getFraction() >= OutputType(0.5).getFraction()) ? ceilFixed(value) : floorFixed(value))
: ((value.getFraction() <= OutputType(0.5).getFraction()) ? floorFixed(value) : ceilFixed(value))
);
}
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