49 lines
2.2 KiB
C
49 lines
2.2 KiB
C
/****************************************************************************
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** Copyright (c) 2016, Fougue Ltd. <http://www.fougue.pro>
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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**
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** 2. Redistributions in binary form must reproduce the above
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** copyright notice, this list of conditions and the following
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** disclaimer in the documentation and/or other materials provided
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** with the distribution.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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****************************************************************************/
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#include "numeric_utils.h"
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bool gmio_float32_ulp_equals(float a, float 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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