11.1Sriastrad/* $NetBSD: n_frexpf.c,v 1.1 2024/05/09 14:42:10 riastradh Exp $ */ 21.1Sriastrad 31.1Sriastrad/*- 41.1Sriastrad * Copyright (c) 2024 The NetBSD Foundation, Inc. 51.1Sriastrad * All rights reserved. 61.1Sriastrad * 71.1Sriastrad * Redistribution and use in source and binary forms, with or without 81.1Sriastrad * modification, are permitted provided that the following conditions 91.1Sriastrad * are met: 101.1Sriastrad * 1. Redistributions of source code must retain the above copyright 111.1Sriastrad * notice, this list of conditions and the following disclaimer. 121.1Sriastrad * 2. Redistributions in binary form must reproduce the above copyright 131.1Sriastrad * notice, this list of conditions and the following disclaimer in the 141.1Sriastrad * documentation and/or other materials provided with the distribution. 151.1Sriastrad * 161.1Sriastrad * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 171.1Sriastrad * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 181.1Sriastrad * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 191.1Sriastrad * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 201.1Sriastrad * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 211.1Sriastrad * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 221.1Sriastrad * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 231.1Sriastrad * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 241.1Sriastrad * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 251.1Sriastrad * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 261.1Sriastrad * POSSIBILITY OF SUCH DAMAGE. 271.1Sriastrad */ 281.1Sriastrad 291.1Sriastrad#include <sys/cdefs.h> 301.1Sriastrad__RCSID("$NetBSD: n_frexpf.c,v 1.1 2024/05/09 14:42:10 riastradh Exp $"); 311.1Sriastrad 321.1Sriastrad#include "namespace.h" 331.1Sriastrad 341.1Sriastrad#include <math.h> 351.1Sriastrad 361.1Sriastradfloat 371.1Sriastradfrexpf(float x, int *e) 381.1Sriastrad{ 391.1Sriastrad 401.1Sriastrad /* 411.1Sriastrad * We assume every value representable by float is also 421.1Sriastrad * representable by double. The normalized result of frexp 431.1Sriastrad * differs only by the exponent, which is set to -1 (result 441.1Sriastrad * lies in [1/2, 1) or is zero), so it is also still 451.1Sriastrad * representable by float. 461.1Sriastrad * 471.1Sriastrad * This can't simply be a symbol alias, however, because the 481.1Sriastrad * ABI of float frexpf(float, int *) is different from the ABI 491.1Sriastrad * of double frexp(double, int *). 501.1Sriastrad */ 511.1Sriastrad return frexp(x, e); 521.1Sriastrad} 53