mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
5980be9b3c
This work is based in part on code from NetBSD libm, libc and kernel. The library is partly public domain and partly BSD-style licensed.
106 lines
3 KiB
ArmAsm
106 lines
3 KiB
ArmAsm
/* $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
|