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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:
|
|
