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Use hardware remainder on amd64 since it is 5 to 10 times faster than

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software remainder and is already used for remquo().
This commit is contained in:
Bruce Evans 2008-02-13 06:01:48 +00:00
parent a2c4cd4549
commit 02ef796d23
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=176227
3 changed files with 78 additions and 1 deletions
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3
lib/msun/amd64/Makefile.inc
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@ -2,6 +2,7 @@
ARCH_SRCS = e_sqrt.S e_sqrtf.S s_llrint.S s_llrintf.S s_llrintl.S \
s_logbl.S s_lrint.S s_lrintf.S s_lrintl.S \
s_remquo.S s_remquof.S s_rintl.S s_scalbn.S s_scalbnf.S s_scalbnl.S
e_remainder.S e_remainderf.S s_remquo.S s_remquof.S \
s_rintl.S s_scalbn.S s_scalbnf.S s_scalbnl.S
LDBL_PREC = 64
SYM_MAPS += ${.CURDIR}/amd64/Symbol.map

53
lib/msun/amd64/e_remainder.S Normal file
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@ -0,0 +1,53 @@
/*
* Copyright (c) 1993,94 Winning Strategies, Inc.
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Winning Strategies, Inc.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 the i387 version written by:
* J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
*/
#include <machine/asm.h>
RCSID("from: FreeBSD: src/lib/msun/i387/e_remainder.S,v 1.8 2005/02/04 14:08:32 das Exp")
__FBSDID("$FreeBSD$")
ENTRY(remainder)
movsd %xmm0,-8(%rsp)
movsd %xmm1,-16(%rsp)
fldl -16(%rsp)
fldl -8(%rsp)
1: fprem1
fstsw %ax
testw $0x400,%ax
jne 1b
fstpl -8(%rsp)
movsd -8(%rsp),%xmm0
fstp %st
ret

23
lib/msun/amd64/e_remainderf.S Normal file
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@ -0,0 +1,23 @@
/*
* Based on the i387 version written by J.T. Conklin <jtc@netbsd.org>.
* Public domain.
*/
#include <machine/asm.h>
RCSID("from: $NetBSD: e_remainderf.S,v 1.2 1995/05/08 23:49:47 jtc Exp $")
__FBSDID("$FreeBSD$")
ENTRY(remainderf)
movss %xmm0,-4(%rsp)
movss %xmm1,-8(%rsp)
flds -8(%rsp)
flds -4(%rsp)
1: fprem1
fstsw %ax
testw $0x400,%ax
jne 1b
fstps -4(%rsp)
movss -4(%rsp),%xmm0
fstp %st
ret