2015-04-10 20:28:05 +08:00
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/****************************************************************************
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2015-05-28 15:40:24 +08:00
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** gmio
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2015-05-01 00:19:45 +08:00
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** Copyright Fougue (2 Mar. 2015)
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2015-07-13 17:42:03 +08:00
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** contact@fougue.pro
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2015-04-10 20:28:05 +08:00
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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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#include "utils.h"
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gmio_bool_t gmio_float32_equals_by_ulp(
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gmio_float32_t a, gmio_float32_t b, uint32_t max_ulp_diff)
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{
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const int32_t ia = gmio_convert_int32(a);
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const int32_t ib = gmio_convert_int32(b);
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const int32_t slp_diff = ia - ib;
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const uint32_t ulp_diff = slp_diff > 0 ? slp_diff : -slp_diff;
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/* Different signs, we could maybe get difference to 0, but so close to 0
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* using epsilons is better */
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if (gmio_int32_sign(ia) != gmio_int32_sign(ib)) {
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/* Check for equality to make sure +0 == -0 */
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return ia == ib;
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}
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/* Find the difference in ULPs */
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return ulp_diff <= max_ulp_diff;
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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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