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   "remquol.s"
  30 
  31 #include "libm.h"
  32 LIBM_ANSI_PRAGMA_WEAK(remquol,function)
  33 #include "libm_protos.h"
  34         ENTRY(remquol)
  35         fldt    24(%rsp)                / load arg y
  36         fldt    8(%rsp)                 / load arg x
  37 .Lreml_loop:
  38         fprem1                          / partial remainder
  39         fstsw   %ax                     / store status word
  40         andw    $0x400,%ax              / check whether reduction complete
  41         jne     .Lreml_loop             / while reduction incomplete, do fprem1
  42         fstsw   %ax
  43         fwait
  44         fstp    %st(1)
  45         movw    %ax,%dx
  46         andw    $0x4000,%dx             / get C3
  47         sarw    $13,%dx
  48         movw    %ax,%cx
  49         andw    $0x100,%cx              / get C0
  50         sarw    $6,%cx
  51         addw    %cx,%dx
  52         andw    $0x200,%ax              / get C1
  53         sarw    $9,%ax
  54         addw    %dx,%ax
  55         cwtl    
  56         movl    16(%rsp),%edx           / sign and bexp of x
  57         movl    32(%rsp),%ecx           / sign and bexp of y
  58         andl    $0x8000,%edx            / edx <- sign(x)
  59         andl    $0x8000,%ecx            / ecx <- sign(y)
  60         cmpl    %edx,%ecx
  61         je      1f
  62         negl    %eax                    / negative n
  63 1:
  64         movl    %eax,(%rdi)             / last 3 significant bits of quotient
  65         ret
  66         .align  16
  67         SET_SIZE(remquol)