2008-03-30 21:21:53 +00:00
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/*-
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* Copyright (c) 2005-2008 David Schultz <das@FreeBSD.ORG>
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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/*
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* Based on public-domain remainder routine by J.T. Conklin <jtc@NetBSD.org>.
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*/
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#include <machine/asm.h>
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__FBSDID("$FreeBSD$");
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ENTRY(remquol)
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fldt 24(%rsp)
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fldt 8(%rsp)
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1: fprem1
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fstsw %ax
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btw $10,%ax
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jc 1b
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fstp %st(1)
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/* Extract the three low-order bits of the quotient from C0,C3,C1. */
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shrl $6,%eax
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movl %eax,%ecx
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andl $0x108,%eax
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rorl $7,%eax
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orl %eax,%ecx
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roll $4,%eax
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orl %ecx,%eax
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andl $7,%eax
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/* Negate the quotient bits if x*y<0. Avoid using an unpredictable branch. */
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movl 32(%rsp),%ecx
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xorl 16(%rsp),%ecx
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movsx %cx,%ecx
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sarl $16,%ecx
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sarl $16,%ecx
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xorl %ecx,%eax
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andl $1,%ecx
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addl %ecx,%eax
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/* Store the quotient and return. */
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movl %eax,(%rdi)
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ret
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2011-01-07 16:13:12 +00:00
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.section .note.GNU-stack,"",%progbits
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