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 "finitel.s"
  30 
  31 #include "libm.h"
  32 LIBM_ANSI_PRAGMA_WEAK(finitel,function)
  33 #include "libm_synonyms.h"
  34 
  35         ENTRY(finitel)
  36         movl    12(%esp),%eax           / %ax <-- sign&bexp(x)
  37         testl   $0x80000000,8(%esp)     / ZF = 1 iff hi_32(sgnfcnd(x))'s msb = 0
  38         jz      .chk_denormal_or_0
  39         notl    %eax                    / not(bexp) = 0 iff bexp = all 1's
  40         andl    $0x00007fff,%eax        / ZF <-- 1      iff not(bexp) = 0
  41         jz      .done                   / no jump if arg. is finite
  42         movl    $1,%eax                 / ansi needs %eax = 1
  43 .done:
  44         ret
  45 
  46 .chk_denormal_or_0:
  47         andl    $0x00007fff,%eax        / ZF <-- 1 iff bexp = 0 iff denormal or 0
  48         jnz     .unsupported            / jump if arg has unsupported format
  49         movl    $1,%eax                 / ansi needs %eax = 1
  50         ret
  51 
  52 .unsupported:
  53         movl    $0,%eax                 / unsupported format does not represent
  54         ret                             / a finite number
  55         .align  4
  56         SET_SIZE(finitel)