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/****************************************************************************** |
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* Top contributors (to current version): |
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* Aina Niemetz, Martin Brain, Mathias Preiner |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* The class representing a floating-point format. |
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*/ |
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#include "cvc5_public.h" |
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#ifndef CVC5__FLOATINGPOINT_SIZE_H |
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#define CVC5__FLOATINGPOINT_SIZE_H |
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namespace cvc5 { |
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// Inline these! |
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inline bool validExponentSize(uint32_t e) { return e >= 2; } |
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inline bool validSignificandSize(uint32_t s) { return s >= 2; } |
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/** |
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* Floating point sorts are parameterised by two constants > 1 giving the |
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* width (in bits) of the exponent and significand (including the hidden bit). |
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* So, IEEE-754 single precision, a.k.a. float, is described as 8 24. |
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*/ |
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class FloatingPointSize |
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{ |
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public: |
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/** Constructors. */ |
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FloatingPointSize(uint32_t exp_size, uint32_t sig_size); |
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FloatingPointSize(const FloatingPointSize& old); |
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/** Operator overload for equality comparison. */ |
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bool operator==(const FloatingPointSize& fps) const |
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{ |
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return (d_exp_size == fps.d_exp_size) && (d_sig_size == fps.d_sig_size); |
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} |
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/** Implement the interface that symfpu uses for floating-point formats. */ |
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/** Get the exponent bit-width of this floating-point format. */ |
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inline uint32_t exponentWidth(void) const { return d_exp_size; } |
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/** Get the significand bit-width of this floating-point format. */ |
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inline uint32_t significandWidth(void) const { return d_sig_size; } |
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/** |
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* Get the bit-width of the packed representation of this floating-point |
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* format (= exponent + significand bit-width, convenience wrapper). |
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*/ |
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inline uint32_t packedWidth(void) const |
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{ |
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return exponentWidth() + significandWidth(); |
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} |
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/** |
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* Get the exponent bit-width of the packed representation of this |
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* floating-point format (= exponent bit-width). |
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*/ |
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inline uint32_t packedExponentWidth(void) const { return exponentWidth(); } |
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/** |
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* Get the significand bit-width of the packed representation of this |
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* floating-point format (= significand bit-width - 1). |
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*/ |
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inline uint32_t packedSignificandWidth(void) const |
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{ |
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return significandWidth() - 1; |
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} |
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private: |
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/** Exponent bit-width. */ |
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uint32_t d_exp_size; |
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/** Significand bit-width. */ |
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uint32_t d_sig_size; |
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}; /* class FloatingPointSize */ |
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/** |
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* Hash function for floating point formats. |
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*/ |
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struct FloatingPointSizeHashFunction |
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{ |
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static inline size_t ROLL(size_t X, size_t N) |
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{ |
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return (((X) << (N)) | ((X) >> (8 * sizeof((X)) - (N)))); |
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} |
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inline size_t operator()(const FloatingPointSize& t) const |
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{ |
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return size_t(ROLL(t.exponentWidth(), 4 * sizeof(uint32_t)) |
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| t.significandWidth()); |
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} |
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}; /* struct FloatingPointSizeHashFunction */ |
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} // namespace cvc5 |
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#endif |