| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970 |
- // 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:
|
