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

   1 /*-
   2  * Copyright (c) 2013 The NetBSD Foundation, Inc.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to The NetBSD Foundation
   6  * by Matt Thomas of 3am Software Foundry.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  20  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  27  * POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 #if defined(LIBC_SCCS) && !defined(lint)
  32 __RCSID("$NetBSD: __aeabi_dcmpun.c,v 1.1 2013/01/26 07:04:22 matt Exp $");
  33 #endif /* LIBC_SCCS and not lint */
  34
  35 #include <arm/aeabi.h>
  36 #include <arm/ieee.h>
  37
  38 #include <math.h>
  39
  40 /*
  41  * result (1, 0) denotes (?, <=>) [2], use for C99 isunordered()
  42  */
  43
  44 int
  45 __aeabi_dcmpun(double x, double y)
  46 {
  47         const union ieee_double_u ux = { .dblu_d = x };
  48         const union ieee_double_u uy = { .dblu_d = y };
  49
  50         return (ux.dblu_dbl.dbl_exp == DBL_EXP_INFNAN
  51                 && (ux.dblu_dbl.dbl_frach|ux.dblu_dbl.dbl_fracl) != 0)
  52             || (uy.dblu_dbl.dbl_exp == DBL_EXP_INFNAN
  53                 && (uy.dblu_dbl.dbl_frach|uy.dblu_dbl.dbl_fracl) != 0);
  54 }