96 lines
2.8 KiB
ArmAsm
96 lines
2.8 KiB
ArmAsm
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Sean Eric Fagan.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)modf.s 5.5 (Berkeley) 3/18/91
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*/
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#include <machine/asm.h>
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#if defined(LIBC_SCCS)
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RCSID("$NetBSD: modf.S,v 1.5 1997/07/16 14:37:18 christos Exp $")
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#endif
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__FBSDID("$FreeBSD$");
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/*
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* modf(value, iptr): return fractional part of value, and stores the
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* integral part into iptr (a pointer to double).
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*
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* Written by Sean Eric Fagan (sef@kithrup.COM)
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* Sun Mar 11 20:27:30 PST 1990
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*/
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/* With CHOP mode on, frndint behaves as TRUNC does. Useful. */
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ENTRY(modf)
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pushq %rbp
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movq %rsp,%rbp
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subq $24,%rsp
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/*
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* Set chop mode.
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*/
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fnstcw -12(%rbp)
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movw -12(%rbp),%dx
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orw $3072,%dx
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movw %dx,-16(%rbp)
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fldcw -16(%rbp)
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/*
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* Get integral part.
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*/
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movsd %xmm0,-24(%rbp)
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fldl -24(%rbp)
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frndint
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fstpl -8(%rbp)
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/*
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* Restore control word.
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*/
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fldcw -12(%rbp)
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/*
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* Store integral part.
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*/
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movsd -8(%rbp),%xmm0
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movsd %xmm0,(%rdi)
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/*
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* Get fractional part and return it.
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*/
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fldl -24(%rbp)
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fsubl -8(%rbp)
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movsd -8(%rbp),%xmm0
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leave
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ret
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