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      1 #ifndef _TCUFLOATFORMAT_HPP
      2 #define _TCUFLOATFORMAT_HPP
      3 /*-------------------------------------------------------------------------
      4  * drawElements Quality Program Tester Core
      5  * ----------------------------------------
      6  *
      7  * Copyright 2014 The Android Open Source Project
      8  *
      9  * Licensed under the Apache License, Version 2.0 (the "License");
     10  * you may not use this file except in compliance with the License.
     11  * You may obtain a copy of the License at
     12  *
     13  *      http://www.apache.org/licenses/LICENSE-2.0
     14  *
     15  * Unless required by applicable law or agreed to in writing, software
     16  * distributed under the License is distributed on an "AS IS" BASIS,
     17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     18  * See the License for the specific language governing permissions and
     19  * limitations under the License.
     20  *
     21  *//*!
     22  * \file
     23  * \brief Adjustable-precision floating point operations.
     24  *//*--------------------------------------------------------------------*/
     25 
     26 #include "tcuDefs.hpp"
     27 
     28 #include "tcuInterval.hpp"
     29 
     30 #include <string>
     31 
     32 namespace tcu
     33 {
     34 
     35 enum YesNoMaybe
     36 {
     37 	NO,
     38 	MAYBE,
     39 	YES
     40 };
     41 
     42 class FloatFormat
     43 {
     44 public:
     45 
     46 						FloatFormat	(int		minExp,
     47 									 int		maxExp,
     48 									 int		fractionBits,
     49 									 bool		exactPrecision,
     50 									 YesNoMaybe	hasSubnormal	= MAYBE,
     51 									 YesNoMaybe	hasInf			= MAYBE,
     52 									 YesNoMaybe	hasNaN			= MAYBE);
     53 
     54 	int					getMinExp		(void) const { return m_minExp; }
     55 	int					getMaxExp		(void) const { return m_maxExp; }
     56 	double				getMaxValue		(void) const { return m_maxValue; }
     57 	int					getFractionBits	(void) const { return m_fractionBits; }
     58 	YesNoMaybe			hasInf			(void) const { return m_hasInf; }
     59 	YesNoMaybe			hasSubnormal	(void) const { return m_hasSubnormal; }
     60 
     61 	double				ulp				(double x, double count = 1.0) const;
     62 	Interval			roundOut		(const Interval& x, bool roundUnderOverflow) const;
     63 	double				round			(double d, bool upward) const;
     64 	double				roundOut		(double d, bool upward, bool roundUnderOverflow) const;
     65 	Interval			convert			(const Interval& x) const;
     66 
     67 	std::string			floatToHex		(double x) const;
     68 	std::string 		intervalToHex	(const Interval& interval) const;
     69 
     70 	static FloatFormat	nativeFloat		(void);
     71 	static FloatFormat	nativeDouble	(void);
     72 
     73 private:
     74 	int					exponentShift 	(int exp) const;
     75 	Interval			clampValue		(double d) const;
     76 
     77 	int					m_minExp;			// Minimum exponent, inclusive
     78 	int					m_maxExp;			// Maximum exponent, inclusive
     79 	int					m_fractionBits;		// Number of fractional bits in significand
     80 	YesNoMaybe			m_hasSubnormal;		// Does the format support denormalized numbers?
     81 	YesNoMaybe			m_hasInf;			// Does the format support infinities?
     82 	YesNoMaybe			m_hasNaN;			// Does the format support NaNs?
     83 	bool				m_exactPrecision;	// Are larger precisions disallowed?
     84 	double				m_maxValue;			// Largest representable finite value.
     85 } DE_WARN_UNUSED_TYPE;
     86 
     87 void		FloatFormat_selfTest	(void);
     88 
     89 } // tcu
     90 
     91 #endif // _TCUFLOATFORMAT_HPP
     92