1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (C) 2005-2017 Andes Technology Corporation 3 4 5 beq $r1, $r0, quit_memcpy 6 beqz $r2, quit_memcpy 7 srli $r3, $r2, #5 ! check if len < cache-line size 32 8 beqz $r3, word_copy_entry 9 andi $r4, $r0, #0x3 ! check byte-align 10 beqz $r4, unalign_word_copy_entry 11 12 addi $r4, $r4,#-4 13 abs $r4, $r4 ! check how many un-align byte to copy 14 sub $r2, $r2, $r4 ! update $R2 15 16 unalign_byte_copy: 17 lbi1 $r3, $r1, #1 18 addi $r4, $r4, #-1 19 sbi1 $r3, $r0, #1 20 bnez $r4, unalign_byte_copy 21 beqz $r2, quit_memcpy 22 23 unalign_word_copy_entry: 24 andi $r3, $r0, 0x1f ! check cache-line unaligncount 25 beqz $r3, cache_copy 26 27 addi $r3, $r3, #-32 28 abs $r3, $r3 29 sub $r2, $r2, $r3 ! update $R2 30 31 unalign_word_copy: 32 lmw1 $r4, $r1, $r4 33 addi $r3, $r3, #-4 34 smw1 $r4, $r0, $r4 35 bnez $r3, unalign_word_copy 36 beqz $r2, quit_memcpy 37 38 addi $r3, $r2, #-32 ! to check $r2< cache_line , than go to word_copy 39 bltz $r3, word_copy_entry 40 cache_copy: 41 srli $r3, $r2, #5 42 beqz $r3, word_copy_entry 43 3: 44 lmw1 $r17, $r1, $r24 45 addi $r3, $r3, #-1 46 smw1 $r17, $r0, $r24 47 bnez $r3, 3b 48 49 word_copy_entry: 50 andi $r2, $r2, #31 51 52 beqz $r2, quit_memcpy 53 5: 54 srli $r3, $r2, #2 55 beqz $r3, byte_copy 56 word_copy: 57 lmw1 $r4, $r1, $r4 58 addi $r3, $r3, #-1 59 smw1 $r4, $r0, $r4 60 bnez $r3, word_copy 61 andi $r2, $r2, #3 62 beqz $r2, quit_memcpy 63 byte_copy: 64 lbi1 $r3, $r1, #1 65 addi $r2, $r2, #-1 66 67 sbi1 $r3, $r0, #1 68 bnez $r2, byte_copy 69 quit_memcpy: 70