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

/*-
 * 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);
}