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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2005-2017 Andes Technology Corporation
beq $r1, $r0, quit_memcpy
beqz $r2, quit_memcpy
srli $r3, $r2, #5 ! check if len < cache-line size 32
beqz $r3, word_copy_entry
andi $r4, $r0, #0x3 ! check byte-align
beqz $r4, unalign_word_copy_entry
addi $r4, $r4,#-4
abs $r4, $r4 ! check how many un-align byte to copy
sub $r2, $r2, $r4 ! update $R2
unalign_byte_copy:
lbi1 $r3, $r1, #1
addi $r4, $r4, #-1
sbi1 $r3, $r0, #1
bnez $r4, unalign_byte_copy
beqz $r2, quit_memcpy
unalign_word_copy_entry:
andi $r3, $r0, 0x1f ! check cache-line unaligncount
beqz $r3, cache_copy
addi $r3, $r3, #-32
abs $r3, $r3
sub $r2, $r2, $r3 ! update $R2
unalign_word_copy:
lmw1 $r4, $r1, $r4
addi $r3, $r3, #-4
smw1 $r4, $r0, $r4
bnez $r3, unalign_word_copy
beqz $r2, quit_memcpy
addi $r3, $r2, #-32 ! to check $r2< cache_line , than go to word_copy
bltz $r3, word_copy_entry
cache_copy:
srli $r3, $r2, #5
beqz $r3, word_copy_entry
3:
lmw1 $r17, $r1, $r24
addi $r3, $r3, #-1
smw1 $r17, $r0, $r24
bnez $r3, 3b
word_copy_entry:
andi $r2, $r2, #31
beqz $r2, quit_memcpy
5:
srli $r3, $r2, #2
beqz $r3, byte_copy
word_copy:
lmw1 $r4, $r1, $r4
addi $r3, $r3, #-1
smw1 $r4, $r0, $r4
bnez $r3, word_copy
andi $r2, $r2, #3
beqz $r2, quit_memcpy
byte_copy:
lbi1 $r3, $r1, #1
addi $r2, $r2, #-1
sbi1 $r3, $r0, #1
bnez $r2, byte_copy
quit_memcpy:
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