usr/src/lib/libm/i386/src/finitef.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  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  23  */
  24 /*
  25  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28
  29         .file "finitef.s"
  30
  31 #include "libm.h"
  32
  33         ENTRY(finitef)
  34         movl    4(%esp),%eax            / eax <-- x
  35         notl    %eax                    / not(bexp) = 0 iff bexp = all 1's
  36         andl    $0x7f800000,%eax        / ZF <-- 1      iff not(bexp) = 0
  37         jz      .done                   / no jump if arg. is finite
  38         movl    $1,%eax                 / %ax was 0; ansi needs %eax = 1
  39 .done:
  40         ret
  41         .align  4
  42         SET_SIZE(finitef)