minix/lib/libc/arch/arm/gen/__aeabi_dcmpun.c

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/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: __aeabi_dcmpun.c,v 1.1 2013/01/26 07:04:22 matt Exp $");
#endif /* LIBC_SCCS and not lint */
#include <arm/aeabi.h>
#include <arm/ieee.h>
#include <math.h>
/*
* result (1, 0) denotes (?, <=>) [2], use for C99 isunordered()
*/
int
__aeabi_dcmpun(double x, double y)
{
const union ieee_double_u ux = { .dblu_d = x };
const union ieee_double_u uy = { .dblu_d = y };
return (ux.dblu_dbl.dbl_exp == DBL_EXP_INFNAN
&& (ux.dblu_dbl.dbl_frach|ux.dblu_dbl.dbl_fracl) != 0)
|| (uy.dblu_dbl.dbl_exp == DBL_EXP_INFNAN
&& (uy.dblu_dbl.dbl_frach|uy.dblu_dbl.dbl_fracl) != 0);
}