d3937f3b37
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.
120 lines
4 KiB
C
120 lines
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_cvfd_class(const char *name, double fin)
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{
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test_diag("converting '%e' -> fp80...", fin);
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fp80_t v = fp80_cvfd(fin);
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int class_ok;
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int fp64_class = fpclassify(fin);
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int class = fp64_class == FP_SUBNORMAL ? FP_NORMAL : fp64_class;
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int fp80_class = fp80_classify(v);
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printf("# ");
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fp80_debug_dump(stdout, v);
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test_diag("isnan: %i, isinf: %i, iszero: %i, isnormal: %i, issubnormal: %i",
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fp80_isnan(v), fp80_isinf(v), fp80_iszero(v),
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fp80_isnormal(v), fp80_issubnormal(v));
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test_diag("class(fp64): %i, expected class: %i, class(fp80): %i",
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fp64_class, class, fp80_classify(v));
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switch (class) {
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case FP_NAN:
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class_ok = fp80_isnan(v) && !fp80_isinf(v) && !fp80_iszero(v) &&
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!fp80_isnormal(v) && !fp80_issubnormal(v);
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break;
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case FP_INFINITE:
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class_ok = !fp80_isnan(v) && fp80_isinf(v) && !fp80_iszero(v) &&
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!fp80_isnormal(v) && !fp80_issubnormal(v);
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break;
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case FP_ZERO:
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class_ok = !fp80_isnan(v) && !fp80_isinf(v) && fp80_iszero(v) &&
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!fp80_isnormal(v) && !fp80_issubnormal(v);
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break;
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case FP_SUBNORMAL:
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class_ok = !fp80_isnan(v) && !fp80_isinf(v) && !fp80_iszero(v) &&
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!fp80_isnormal(v) && fp80_issubnormal(v);
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break;
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case FP_NORMAL:
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class_ok = !fp80_isnan(v) && !fp80_isinf(v) && !fp80_iszero(v) &&
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fp80_isnormal(v) && !fp80_issubnormal(v);
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break;
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default:
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test_bail("unexpected FP class (%i)", class);
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}
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if (!class_ok) {
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test_diag("inconsistent classification");
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test_fail(name);
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} else if (fp80_class != class) {
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test_diag("class mismatch");
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test_fail(name);
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} else {
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test_ok(name);
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}
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}
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static void
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test_cvfd_class_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_cvfd_class(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_cvfd_class("double->fp80 +inf", -INFINITY);
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test_cvfd_class("double->fp80 -inf", INFINITY);
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test_cvfd_class("double->fp80 +nan", NAN);
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test_cvfd_class("double->fp80 -nan", -NAN);
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test_cvfd_class("double->fp80 +0", 0);
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test_cvfd_class("double->fp80 PI", M_PI);
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test_cvfd_class_exp("double->fp80 smallest normal", 1.0, -1022);
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test_cvfd_class_exp("double->fp80 denormal1", 0.5, -1022);
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test_cvfd_class_exp("double->fp80 denormal2", 0.25, -1022);
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test_exit();
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}
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