/*- * Copyright (c) 2005-2008 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(remquol) fldt 24(%rsp) fldt 8(%rsp) 1: fprem1 fstsw %ax btw $10,%ax jc 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 32(%rsp),%ecx xorl 16(%rsp),%ecx movsx %cx,%ecx sarl $16,%ecx sarl $16,%ecx xorl %ecx,%eax andl $1,%ecx addl %ecx,%eax /* Store the quotient and return. */ movl %eax,(%rdi) ret .section .note.GNU-stack,"",%progbits |