67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
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/****************************************************************************
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** gmio
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** Copyright Fougue (2 Mar. 2015)
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** contact@fougue.pro
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**
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** This software is a reusable library whose purpose is to provide complete
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** I/O support for various CAD file formats (eg. STL)
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**
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** This software is governed by the CeCILL-B license under French law and
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** abiding by the rules of distribution of free software. You can use,
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** modify and/ or redistribute the software under the terms of the CeCILL-B
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** license as circulated by CEA, CNRS and INRIA at the following URL
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** "http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.html".
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****************************************************************************/
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#ifndef GMIO_INTERNAL_NUMERIC_UTILS_H
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#define GMIO_INTERNAL_NUMERIC_UTILS_H
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#include "../global.h"
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#include "convert.h"
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#include <stddef.h>
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/*! Does \p a and \p b compares equals by ULP (Units in the Last Place) ?
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*
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* ULP = spacing between floating-point numbers
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*
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* See:
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* http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm
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*/
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gmio_bool_t gmio_float32_ulp_equals(
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gmio_float32_t a, gmio_float32_t b, uint32_t max_ulp_diff);
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/*! Count of ULP between \p a and \p b */
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GMIO_INLINE uint32_t gmio_float32_ulp_diff(gmio_float32_t a, gmio_float32_t b);
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/*! Portable sign-extraction for int32 */
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GMIO_INLINE int gmio_int32_sign(int32_t v);
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/*! Portable sign-extraction for float32 */
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GMIO_INLINE int gmio_float32_sign(gmio_float32_t v);
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/*
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* Implementation
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*/
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uint32_t gmio_float32_ulp_diff(gmio_float32_t a, gmio_float32_t b)
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{
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const uint32_t ua = gmio_convert_uint32(a);
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const uint32_t ub = gmio_convert_uint32(b);
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return ua > ub ? ua - ub : ub - ua;
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}
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int gmio_int32_sign(int32_t v)
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{
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return (v & 0x80000000) != 0 ? -1 : 1;
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}
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int gmio_float32_sign(gmio_float32_t v)
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{
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return gmio_int32_sign(gmio_convert_int32(v));
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}
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#endif /* GMIO_INTERNAL_NUMERIC_UTILS_H */
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