usr/src/lib/libm/amd64/src/fmod.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 2005 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28
  29         .file "fmod.s"
  30
  31 #include "libm.h"
  32 LIBM_ANSI_PRAGMA_WEAK(fmod,function)
  33 #include "libm_protos.h"
  34
  35         ENTRY(fmod)
  36         push    %rbp
  37         movq    %rsp,%rbp
  38         subq    $16,%rsp
  39         movlpd  %xmm1,-16(%rbp)
  40         movlpd  %xmm0,-8(%rbp)
  41
  42         movl    -12(%rbp),%eax          / eax <-- hi_32(y)
  43         andl    $0x7fffffff,%eax        / eax <-- hi_32(|y|)
  44         orl     -16(%rbp),%eax          / eax <-- lo_32(y)|hi_32(|y|)
  45         je      .yzero
  46
  47         fldl    -16(%rbp)               / y
  48         fldl    -8(%rbp)                / x
  49 .loop:
  50         fprem                           / partial remainder
  51         fstsw   %ax                     / store status word
  52         andw    $0x400,%ax              / check for incomplete reduction
  53         jne     .loop                   / loop while reduction incomplete
  54         fstpl   -8(%rbp)
  55         movsd   -8(%rbp),%xmm0
  56         fstp    %st(0)
  57         leave
  58         ret
  59
  60 .yzero:
  61         PIC_SETUP(1)
  62         movl    $27,%edi
  63         movl    $2,%eax
  64         call    PIC_F(_SVID_libm_err)
  65         PIC_WRAPUP
  66         leave
  67         ret
  68         .align  4
  69         SET_SIZE(fmod)