104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
#ifndef _TCUFLOATFORMAT_HPP
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#define _TCUFLOATFORMAT_HPP
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/*-------------------------------------------------------------------------
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* drawElements Quality Program Tester Core
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* ----------------------------------------
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*
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* Copyright 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*//*!
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* \file
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* \brief Adjustable-precision floating point operations.
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*//*--------------------------------------------------------------------*/
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#include "tcuDefs.hpp"
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#include "tcuInterval.hpp"
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#include <string>
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namespace tcu
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{
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enum YesNoMaybe
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{
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NO,
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MAYBE,
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YES
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};
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class FloatFormat
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{
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public:
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FloatFormat (int minExp,
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int maxExp,
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int fractionBits,
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bool exactPrecision,
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YesNoMaybe hasSubnormal = MAYBE,
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YesNoMaybe hasInf = MAYBE,
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YesNoMaybe hasNaN = MAYBE);
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virtual ~FloatFormat() {}
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int getMinExp (void) const { return m_minExp; }
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int getMaxExp (void) const { return m_maxExp; }
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double getMaxValue (void) const { return m_maxValue; }
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int getFractionBits (void) const { return m_fractionBits; }
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YesNoMaybe hasInf (void) const { return m_hasInf; }
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YesNoMaybe hasSubnormal (void) const { return m_hasSubnormal; }
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virtual double ulp (double x, double count = 1.0) const;
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Interval roundOut (const Interval& x, bool roundUnderOverflow) const;
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virtual double round (double d, bool upward) const;
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virtual double roundOut (double d, bool upward, bool roundUnderOverflow) const;
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Interval convert (const Interval& x) const;
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std::string floatToHex (double x) const;
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std::string intervalToHex (const Interval& interval) const;
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static FloatFormat nativeFloat (void);
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static FloatFormat nativeDouble (void);
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private:
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int exponentShift (int exp) const;
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Interval clampValue (double d) const;
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int m_minExp; // Minimum exponent, inclusive
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int m_maxExp; // Maximum exponent, inclusive
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int m_fractionBits; // Number of fractional bits in significand
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YesNoMaybe m_hasSubnormal; // Does the format support denormalized numbers?
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YesNoMaybe m_hasInf; // Does the format support infinities?
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YesNoMaybe m_hasNaN; // Does the format support NaNs?
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bool m_exactPrecision; // Are larger precisions disallowed?
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double m_maxValue; // Largest representable finite value.
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} DE_WARN_UNUSED_TYPE;
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class NormalizedFormat : public FloatFormat
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{
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public:
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NormalizedFormat (int fractionBits);
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~NormalizedFormat () {}
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double ulp (double x, double count = 1.0) const override;
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double round (double d, bool upward) const override;
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double roundOut (double d, bool upward, bool roundUnderOverflow) const override;
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} DE_WARN_UNUSED_TYPE;
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void FloatFormat_selfTest (void);
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} // tcu
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#endif // _TCUFLOATFORMAT_HPP
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