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/* $OpenBSD: ldexp_test.c,v 1.1 2017/10/15 12:15:30 visa Exp $ */
/*
* Copyright (c) 2017 Visa Hankala
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <assert.h>
#include <math.h>
int
main(int argc, char *argv[])
{
double f;
/*
* Test that the result has the correct sign.
* Assumes IEEE 754 double-precision arithmetics.
*/
assert(ldexp(1.0, -1022) > 0.0); /* IEEE 754 minimum normal positive */
assert(ldexp(1.0, -1023) > 0.0); /* subnormal positive */
assert(ldexp(1.0, -1024) > 0.0); /* subnormal positive */
assert(ldexp(1.0, -1074) > 0.0); /* minimum subnormal positive */
assert(ldexp(1.0, -1075) >= 0.0); /* zero */
assert(ldexp(ldexp(1.0, -1022), -53) >= 0.0); /* zero */
assert(ldexp(1.0, 1023) > 0.0); /* normal positive */
f = ldexp(1.0, 1024); /* infinite positive */
assert(isinf(f));
assert(!signbit(f));
f = ldexp(ldexp(1.0, 1023), 1); /* infinite positive */
assert(isinf(f));
assert(!signbit(f));
assert(ldexp(-1.0, -1022) < 0.0); /* IEEE 754 maximum normal negative */
assert(ldexp(-1.0, -1023) < 0.0); /* subnormal negative */
assert(ldexp(-1.0, -1024) < 0.0); /* subnormal negative */
assert(ldexp(-1.0, -1074) < 0.0); /* maximum subnormal negative */
assert(ldexp(-1.0, -1075) <= 0.0); /* zero */
assert(ldexp(ldexp(-1.0, -1022), -53) <= 0.0); /* zero */
assert(ldexp(-1.0, 1023) < 0.0); /* normal negative */
f = ldexp(-1.0, 1024); /* infinite negative */
assert(isinf(f));
assert(signbit(f));
f = ldexp(ldexp(-1.0, 1023), 1); /* infinite negative */
assert(isinf(f));
assert(signbit(f));
f = ldexp(NAN, 0);
assert(isnan(f));
assert(!signbit(f));
f = ldexp(-NAN, 0);
assert(isnan(f));
assert(signbit(f));
return 0;
}
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