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/* memcpy.S: optimised assembly memcpy
*
* Copyright (C) 2003, 2004 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <features.h>
.text
.p2align 4
###############################################################################
#
# void *memcpy(void *to, const char *from, size_t count)
#
# - NOTE: must not use any stack. exception detection performs function return
# to caller's fixup routine, aborting the remainder of the copy
#
###############################################################################
.globl memcpy
.type memcpy,@function
memcpy:
or.p gr8,gr9,gr4
orcc gr10,gr0,gr0,icc3
or.p gr10,gr4,gr4
beqlr icc3,#0
# optimise based on best common alignment for to, from & count
andicc.p gr4,#0x1f,gr0,icc0
setlos #8,gr11
andicc.p gr4,#0x0f,gr0,icc1
beq icc0,#0,memcpy_32
andicc.p gr4,#0x07,gr0,icc0
beq icc1,#0,memcpy_16
andicc.p gr4,#0x03,gr0,icc1
beq icc0,#0,memcpy_8
andicc.p gr4,#0x01,gr0,icc0
beq icc1,#0,memcpy_4
setlos.p #1,gr11
beq icc0,#0,memcpy_2
# do byte by byte copy
sub.p gr8,gr11,gr3
sub gr9,gr11,gr9
0: ldubu.p @(gr9,gr11),gr4
subicc gr10,#1,gr10,icc0
stbu.p gr4,@(gr3,gr11)
bne icc0,#2,0b
bralr
# do halfword by halfword copy
memcpy_2:
setlos #2,gr11
sub.p gr8,gr11,gr3
sub gr9,gr11,gr9
0: lduhu.p @(gr9,gr11),gr4
subicc gr10,#2,gr10,icc0
sthu.p gr4,@(gr3,gr11)
bne icc0,#2,0b
bralr
# do word by word copy
memcpy_4:
setlos #4,gr11
sub.p gr8,gr11,gr3
sub gr9,gr11,gr9
0: ldu.p @(gr9,gr11),gr4
subicc gr10,#4,gr10,icc0
stu.p gr4,@(gr3,gr11)
bne icc0,#2,0b
bralr
# do double-word by double-word copy
memcpy_8:
sub.p gr8,gr11,gr3
sub gr9,gr11,gr9
0: lddu.p @(gr9,gr11),gr4
subicc gr10,#8,gr10,icc0
stdu.p gr4,@(gr3,gr11)
bne icc0,#2,0b
bralr
# do quad-word by quad-word copy
memcpy_16:
sub.p gr8,gr11,gr3
sub gr9,gr11,gr9
0: lddu @(gr9,gr11),gr4
lddu.p @(gr9,gr11),gr6
subicc gr10,#16,gr10,icc0
stdu gr4,@(gr3,gr11)
stdu.p gr6,@(gr3,gr11)
bne icc0,#2,0b
bralr
# do eight-word by eight-word copy
memcpy_32:
sub.p gr8,gr11,gr3
sub gr9,gr11,gr9
0: lddu @(gr9,gr11),gr4
lddu @(gr9,gr11),gr6
lddu @(gr9,gr11),gr12
lddu.p @(gr9,gr11),gr14
subicc gr10,#32,gr10,icc0
stdu gr4,@(gr3,gr11)
stdu gr6,@(gr3,gr11)
stdu gr12,@(gr3,gr11)
stdu.p gr14,@(gr3,gr11)
bne icc0,#2,0b
bralr
.size memcpy, .-memcpy
libc_hidden_def(memcpy)
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