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 2005 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28 
  29         .file "remainder.s"
  30 
  31 #include "libm.h"
  32 LIBM_ANSI_PRAGMA_WEAK(remainder,function)
  33 #include "libm_protos.h"
  34 
  35         ENTRY(remainder)
  36         pushl   %ebp
  37         movl    %esp,%ebp
  38         fldl    16(%esp)                / load arg y
  39         fldl    8(%esp)                 / load arg x
  40         fucom
  41         fnstsw  %ax
  42         sahf
  43         jp      .rem_loop               / if x or y is NaN, use fprem1
  44 
  45         movl    20(%esp),%eax           / eax <-- hi_32(y)
  46         andl    $0x7fffffff,%eax        / eax <-- hi_32(|y|)
  47         orl     16(%esp),%eax           / eax <-- lo_32(y)|hi_32(|y|)
  48         je      .yzero_or_xinf
  49 
  50         movl    12(%esp),%eax           / eax <-- hi_32(x)
  51         andl    $0x7fffffff,%eax        / eax <-- hi_32(|x|)
  52         cmpl    $0x7ff00000,%eax
  53         jne     .rem_loop
  54         cmpl    $0,8(%esp)
  55         je      .yzero_or_xinf
  56 
  57 .rem_loop:
  58         fprem1                          / partial remainder
  59         fstsw   %ax                     / store status word
  60         andw    $0x400,%ax              / check for incomplete reduction
  61         jne     .rem_loop               / while incomplete, do fprem1 again
  62         fstp    %st(1)
  63         leave
  64         ret
  65 
  66 .yzero_or_xinf:
  67         PIC_SETUP(1)
  68         fstp    %st(0)                  / x
  69         fstp    %st(0)                  / empty NPX stack
  70         pushl   $28                     / case 28 in _SVID_libm_err
  71         pushl   20(%ebp)                / pass y
  72         pushl   16(%ebp)
  73         pushl   12(%ebp)                / pass x
  74         pushl   8(%ebp)
  75         call    PIC_F(_SVID_libm_err)
  76         addl    $20,%esp
  77         PIC_WRAPUP
  78         leave
  79         ret
  80         .align  4
  81         SET_SIZE(remainder)