common/lib/libc/arch/arm/quad/__aeabi_ulcmp.c

   1 /*-
   2  * Copyright (c) 2012 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 #include <sys/cdefs.h>
  30
  31 __RCSID("$NetBSD: __aeabi_ulcmp.c,v 1.2 2012/08/06 02:15:51 matt Exp $");
  32
  33 #include "quad.h"
  34 #include <arm/aeabi.h>
  35
  36 /*
  37  * Return -1, 0, 1 (like strcmp) if a [<, =, >] b
  38  */
  39 int
  40 __aeabi_ulcmp(unsigned long long a, unsigned long long b)
  41 {
  42         const union uu aa = { .uq = a }, bb = { .uq = b };
  43
  44         if (aa.ul[H] < bb.ul[H])
  45                 return -1;
  46         if (aa.ul[H] > bb.ul[H])
  47                 return 1;
  48
  49         if (aa.ul[L] < bb.ul[L])
  50                 return -1;
  51         if (aa.ul[L] > bb.ul[L])
  52                 return 1;
  53
  54         return 0;
  55 }