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/*
Copyright (c) 2015, Synopsys, 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) Neither the name of the Synopsys, Inc., nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
*/
/* This implementation is optimized for performance. For code size a generic
implementation of this function from newlib/libc/string/memcpy.c will be
used. */
#if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED)
#include "asm.h"
#if defined (__ARC601__) || \
(!defined (__ARC_BARREL_SHIFTER__) && !defined (__ARCHS__))
/* Adapted from memcpy-bs.S. */
/* We assume that most sources and destinations are aligned, and
that also lengths are mostly a multiple of four, although to a lesser
extent. */
ENTRY (memcpy)
or r3,r0,r1
bmsk.f 0,r3,1
breq_s r2,0,.Lnil
mov_s r5,r0
bne.d .Lcopy_bytewise
add r6,r0,r2
sub_s r3,r2,1
ld_s r12,[r1,0]
bbit0.d r3,2,.Lnox4
sub r6,r6,8
st.ab r12,[r5,4]
ld.a r12,[r1,4]
.Lnox4:
brlo r2,9,.Lendloop
.Lnox4a:
ld_s r3,[r1,4]
st.ab r12,[r5,8]
ld.a r12,[r1,8]
brlo.d r5,r6,.Lnox4a
st r3,[r5,-4]
.Lendloop:
#ifdef __LITTLE_ENDIAN__
ld r3,[r5,0]
add3 r2,-1,r2
; uses long immediate
xor_s r12,r12,r3
bmsk r12,r12,r2
xor_s r12,r12,r3
#else /* BIG ENDIAN */
bmsk_s r2,r2,1
breq_s r2,0,.Last_store
ld r3,[r5,0]
sub3 r2,31,r2
; uses long immediate
xor_s r3,r3,r12
bmsk r3,r3,r2
xor_s r12,r12,r3
#endif /* ENDIAN */
.Last_store:
j_s.d [blink]
st r12,[r5,0]
.Lnil:
j_s [blink]
.balign 4
.Lcopy_bytewise:
ldb_s r12,[r1,0]
bbit1.d r2,0,.Lnox1
sub r6,r6,2
stb.ab r12,[r5,1]
ldb.a r12,[r1,1]
.Lnox1:
brlo r2,3,.Lendbloop
.Lnox1a:
ldb_s r3,[r1,1]
stb.ab r12,[r5,2]
ldb.a r12,[r1,2]
brlo.d r5,r6,.Lnox1a
stb r3,[r5,-1]
.Lendbloop:
j_s.d [blink]
stb r12,[r5,0]
ENDFUNC (memcpy)
#endif /* __ARC601__ || (!__ARC_BARREL_SHIFTER__ && !__ARCHS__) */
#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */
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