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/* The assembly function for memcpy. C-SKY ABIV2 version.
Copyright (C) 2018-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
ENTRY (memcpy)
/* Test if len less than 4 bytes. */
mov r12, r0
cmplti r2, 4
bt .L_copy_by_byte
andi r13, r0, 3
movi r19, 4
/* Test if dest is not 4 bytes aligned. */
bnez r13, .L_dest_not_aligned
.L_dest_aligned:
/* If dest is aligned, then copy. */
zext r18, r2, 31, 4
/* Test if len less than 16 bytes. */
bez r18, .L_len_less_16bytes
movi r19, 0
LABLE_ALIGN
.L_len_larger_16bytes:
#if defined (__CSKY_VDSPV2__)
vldx.8 vr0, (r1), r19
PRE_BNEZAD (r18)
addi r1, 16
vstx.8 vr0, (r0), r19
addi r0, 16
#elif defined (__csky_fpuv2__) && defined(__CK810__)
fldd fr4, (r1, 0)
PRE_BNEZAD (r18)
fstd fr4, (r0, 0)
fldd fr4, (r1, 8)
addi r1, 16
fstd fr4, (r0, 8)
addi r0, 16
#elif defined (__CK860__)
ldw r3, (r1, 0)
stw r3, (r0, 0)
ldw r3, (r1, 4)
stw r3, (r0, 4)
ldw r3, (r1, 8)
stw r3, (r0, 8)
ldw r3, (r1, 12)
addi r1, 16
stw r3, (r0, 12)
addi r0, 16
#else
ldw r20, (r1, 0)
ldw r21, (r1, 4)
ldw r22, (r1, 8)
ldw r23, (r1, 12)
stw r20, (r0, 0)
stw r21, (r0, 4)
stw r22, (r0, 8)
stw r23, (r0, 12)
PRE_BNEZAD (r18)
addi r1, 16
addi r0, 16
#endif
BNEZAD (r18, .L_len_larger_16bytes)
.L_len_less_16bytes:
zext r18, r2, 3, 2
bez r18, .L_copy_by_byte
.L_len_less_16bytes_loop:
ldw r3, (r1, 0)
PRE_BNEZAD (r18)
addi r1, 4
stw r3, (r0, 0)
addi r0, 4
BNEZAD (r18, .L_len_less_16bytes_loop)
/* Test if len less than 4 bytes. */
.L_copy_by_byte:
zext r18, r2, 1, 0
bez r18, .L_return
.L_copy_by_byte_loop:
ldb r3, (r1, 0)
PRE_BNEZAD (r18)
addi r1, 1
stb r3, (r0, 0)
addi r0, 1
BNEZAD (r18, .L_copy_by_byte_loop)
.L_return:
mov r0, r12
rts
/* If dest is not aligned, just copying some bytes makes the dest
align. */
.L_dest_not_aligned:
sub r13, r19, r13
mov r19, r13
.L_dest_not_aligned_loop:
/* Makes the dest align. */
ldb r3, (r1, 0)
PRE_BNEZAD (r13)
addi r1, 1
stb r3, (r0, 0)
addi r0, 1
BNEZAD (r13, .L_dest_not_aligned_loop)
sub r2, r19
cmplti r2, 4
bt .L_copy_by_byte
/* Check whether the src is aligned. */
br .L_dest_aligned
END (memcpy)
libc_hidden_builtin_def (memcpy)
.weak memcpy
ENTRY (memmove)
subu r3, r0, r1
cmphs r3, r2
bt memcpy
mov r12, r0
addu r0, r0, r2
addu r1, r1, r2
/* Test if len less than 4 bytes. */
cmplti r2, 4
bt .L_copy_by_byte_m
andi r13, r0, 3
/* Test if dest is not 4 bytes aligned. */
bnez r13, .L_dest_not_aligned_m
.L_dest_aligned_m:
/* If dest is aligned, then copy. */
zext r18, r2, 31, 4
/* Test if len less than 16 bytes. */
bez r18, .L_len_less_16bytes_m
movi r19, 0
/* len > 16 bytes */
LABLE_ALIGN
.L_len_larger_16bytes_m:
subi r1, 16
subi r0, 16
#if defined (__CSKY_VDSPV2__)
vldx.8 vr0, (r1), r19
PRE_BNEZAD (r18)
vstx.8 vr0, (r0), r19
#elif defined (__csky_fpuv2__) && defined(__CK810__)
fldd fr4, (r1, 8)
PRE_BNEZAD (r18)
fstd fr4, (r0, 8)
fldd fr4, (r1, 0)
fstd fr4, (r0, 0)
#elif defined (__CK860__)
ldw r3, (r1, 12)
stw r3, (r0, 12)
ldw r3, (r1, 8)
stw r3, (r0, 8)
ldw r3, (r1, 4)
stw r3, (r0, 4)
ldw r3, (r1, 0)
stw r3, (r0, 0)
#else
ldw r20, (r1, 0)
ldw r21, (r1, 4)
ldw r22, (r1, 8)
ldw r23, (r1, 12)
stw r20, (r0, 0)
stw r21, (r0, 4)
stw r22, (r0, 8)
stw r23, (r0, 12)
PRE_BNEZAD (r18)
#endif
BNEZAD (r18, .L_len_larger_16bytes_m)
.L_len_less_16bytes_m:
zext r18, r2, 3, 2
bez r18, .L_copy_by_byte_m
.L_len_less_16bytes_loop_m:
subi r1, 4
subi r0, 4
ldw r3, (r1, 0)
PRE_BNEZAD (r18)
stw r3, (r0, 0)
BNEZAD (r18, .L_len_less_16bytes_loop_m)
/* Test if len less than 4 bytes. */
.L_copy_by_byte_m:
zext r18, r2, 1, 0
bez r18, .L_return_m
.L_copy_by_byte_loop_m:
subi r1, 1
subi r0, 1
ldb r3, (r1, 0)
PRE_BNEZAD (r18)
stb r3, (r0, 0)
BNEZAD (r18, .L_copy_by_byte_loop_m)
.L_return_m:
mov r0, r12
rts
/* If dest is not aligned, just copying some bytes makes the dest
align. */
.L_dest_not_aligned_m:
sub r2, r13
.L_dest_not_aligned_loop_m:
subi r1, 1
subi r0, 1
/* Makes the dest align. */
ldb r3, (r1, 0)
PRE_BNEZAD (r13)
stb r3, (r0, 0)
BNEZAD (r13, .L_dest_not_aligned_loop_m)
cmplti r2, 4
bt .L_copy_by_byte_m
/* Check whether the src is aligned. */
br .L_dest_aligned_m
END (memmove)
libc_hidden_builtin_def (memmove)
.weak memmove
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