This changeset includes libfputils from revision bbf0d61d75. This library can be used to convert to and from 80-bit floats and query the type of an 80-bit float, which is needed to support the x87 FPU.
82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/*
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* Copyright (c) 2013, Andreas Sandberg
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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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* 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
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <fputils/fp80.h>
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#include "test_helper.h"
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#include <assert.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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static void
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test_cvtf(const char *name, double fin)
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{
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fp80_t v80 = fp80_cvfd(fin);
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double v64 = fp80_cvtd(v80);
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test_diag("Conversion '%e' -> fp80 -> double: %e", fin, v64);
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printf("# ");
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fp80_debug_dump(stdout, v80);
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if (v64 == fin ||
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(isnan(fin) && isnan(v64) && signbit(fin) == signbit(v64))) {
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test_ok(name);
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} else {
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test_diag("MISMATCH: %e != %e", fin, v64);
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test_fail(name);
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}
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}
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static void
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test_cvtf_exp(const char *name, double x, int exp)
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{
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double val = ldexp(x, exp);
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test_cvtf(name, val);
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}
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int
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main(int argc, char *argv[])
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{
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test_init(9);
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test_cvtf("+inf", -INFINITY);
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test_cvtf("-inf", INFINITY);
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test_cvtf("+nan", NAN);
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test_cvtf("-nan", -NAN);
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test_cvtf("+0", 0);
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test_cvtf("PI", M_PI);
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test_cvtf_exp("smallest normal", 1.0, -1022);
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test_cvtf_exp("denormal1", 0.5, -1022);
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test_cvtf_exp("denormal2", 0.25, -1022);
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test_exit();
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}
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