1/*- 2 * Copyright (c) 2005-2008 David Schultz <das@FreeBSD.ORG> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27/* 28 * Based on public-domain remainder routine by J.T. Conklin <jtc@NetBSD.org>. 29 */ 30 31#include <machine/asm.h> 32ENTRY(remquol) 33 fldt 16(%esp) 34 fldt 4(%esp) 351: fprem1 36 fstsw %ax 37 sahf 38 jp 1b 39 fstp %st(1) 40/* Extract the three low-order bits of the quotient from C0,C3,C1. */ 41 shrl $6,%eax 42 movl %eax,%ecx 43 andl $0x108,%eax 44 rorl $7,%eax 45 orl %eax,%ecx 46 roll $4,%eax 47 orl %ecx,%eax 48 andl $7,%eax 49/* Negate the quotient bits if x*y<0. Avoid using an unpredictable branch. */ 50 movl 24(%esp),%ecx 51 xorl 12(%esp),%ecx 52 movsx %cx,%ecx 53 sarl $16,%ecx 54 sarl $16,%ecx 55 xorl %ecx,%eax 56 andl $1,%ecx 57 addl %ecx,%eax 58/* Store the quotient and return. */ 59 movl 28(%esp),%ecx 60 movl %eax,(%ecx) 61 ret 62END(remquol) 63 64 .section .note.GNU-stack,"",%progbits 65