66 lines
2.1 KiB
ArmAsm
66 lines
2.1 KiB
ArmAsm
/*-
|
|
* Copyright (c) 2005 David Schultz <das@FreeBSD.ORG>
|
|
* All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
|
|
*/
|
|
|
|
/*
|
|
* Based on public-domain remainder routine by J.T. Conklin <jtc@NetBSD.org>.
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
ENTRY(remquo)
|
|
fldl 12(%esp)
|
|
fldl 4(%esp)
|
|
1: fprem1
|
|
fstsw %ax
|
|
sahf
|
|
jp 1b
|
|
fstp %st(1)
|
|
/* Extract the three low-order bits of the quotient from C0,C3,C1. */
|
|
shrl $6,%eax
|
|
movl %eax,%ecx
|
|
andl $0x108,%eax
|
|
rorl $7,%eax
|
|
orl %eax,%ecx
|
|
roll $4,%eax
|
|
orl %ecx,%eax
|
|
andl $7,%eax
|
|
/* Negate the quotient bits if x*y<0. Avoid using an unpredictable branch. */
|
|
movl 16(%esp),%ecx
|
|
xorl 8(%esp),%ecx
|
|
sarl $16,%ecx
|
|
sarl $16,%ecx
|
|
xorl %ecx,%eax
|
|
andl $1,%ecx
|
|
addl %ecx,%eax
|
|
/* Store the quotient and return. */
|
|
movl 20(%esp),%ecx
|
|
movl %eax,(%ecx)
|
|
ret
|
|
END(remquo)
|
|
|
|
.section .note.GNU-stack,"",%progbits
|