usr/src/lib/libc/amd64/gen/abs.s

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27         .file   "abs.s"
  28
  29 /*
  30  *      Assembler program to implement the following C program
  31  *
  32  *      int
  33  *      abs(int arg)
  34  *      {
  35  *              return((arg < 0)? -arg: arg);
  36  *      }
  37  */
  38
  39 #include "SYS.h"
  40
  41         ENTRY(abs)
  42         movl    %edi, %eax
  43         testl   %eax, %eax      /* arg < 0? */
  44         jns     1f
  45         negl    %eax            /* yes, return -arg */
  46 1:
  47         ret
  48         SET_SIZE(abs)
  49
  50         ENTRY(labs)
  51         movq    %rdi, %rax
  52         testq   %rax, %rax      /* arg < 0? */
  53         jns     1f
  54         negq    %rax            /* yes, return -arg */
  55 1:
  56         ret
  57         SET_SIZE(labs)
  58
  59         ENTRY(llabs)
  60         movq    %rdi, %rax
  61         testq   %rax, %rax      /* arg < 0? */
  62         jns     1f
  63         negq    %rax            /* yes, return -arg */
  64 1:
  65         ret
  66         SET_SIZE(llabs)