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/* $NetBSD: s_modf.S,v 1.1 2006/03/22 20:45:58 drochner Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Sean Eric Fagan.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)modf.s 5.5 (Berkeley) 3/18/91
*/
#include <machine/asm.h>
#if defined(LIBC_SCCS)
RCSID("$NetBSD: s_modf.S,v 1.1 2006/03/22 20:45:58 drochner Exp $")
#endif
/*
* modf(value, iptr): return fractional part of value, and stores the
* integral part into iptr (a pointer to double).
*
* Written by Sean Eric Fagan (sef@kithrup.COM)
* Sun Mar 11 20:27:30 PST 1990
*/
/* With CHOP mode on, frndint behaves as TRUNC does. Useful. */
ENTRY(modf)
#ifdef __x86_64__
pushq %rbp
movq %rsp,%rbp
subq $24,%rsp
/* Set chop mode. */
fnstcw -12(%rbp)
movw -12(%rbp),%dx
orw $3072,%dx
movw %dx,-16(%rbp)
fldcw -16(%rbp)
/* Get integral part. */
movsd %xmm0,-24(%rbp)
fldl -24(%rbp)
frndint
fstpl -8(%rbp)
/* Restore control word. */
fldcw -12(%rbp)
/* Store integral part. */
movsd -8(%rbp),%xmm0
movsd %xmm0,(%rdi)
/* Get fractional part and return it. */
fldl -24(%rbp)
fsubl -8(%rbp)
fstpl -24(%rbp)
movsd -24(%rbp),%xmm0
#else
pushl %ebp
movl %esp,%ebp
subl $16,%esp
fnstcw -12(%ebp)
movw -12(%ebp),%dx
orw $3072,%dx
movw %dx,-16(%ebp)
fldcw -16(%ebp)
fldl 8(%ebp)
frndint
fstpl -8(%ebp)
fldcw -12(%ebp)
movl 16(%ebp),%eax
movl -8(%ebp),%edx
movl -4(%ebp),%ecx
movl %edx,(%eax)
movl %ecx,4(%eax)
fldl 8(%ebp)
fsubl -8(%ebp)
jmp L1
L1:
#endif
leave
ret
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