sys/src/ape/lib/ap/arm64/memmove.s

   1 TEXT memcpy(SB), $-4
   2 TEXT memmove(SB), $-4
   3         MOV     from+8(FP), R1
   4         MOVWU   n+16(FP), R2
   5
   6         CMP     R0, R1
   7         BEQ     _done
   8         BLT     _backward
   9
  10 _forward:
  11         ADD     R0, R2, R3
  12         BIC     $15, R2, R4
  13         CBZ     R4, _floop1
  14         ADD     R0, R4, R4
  15
  16 _floop16:
  17         MOVP    (R1)16!, R5, R6
  18         MOVP    R5, R6, (R0)16!
  19         CMP     R4, R0
  20         BNE     _floop16
  21
  22 _floop1:
  23         CMP     R3, R0
  24         BEQ     _done
  25         MOVBU   (R1)1!, R5
  26         MOVBU   R5, (R0)1!
  27         B       _floop1
  28
  29 _done:
  30         RETURN
  31
  32 _backward:
  33         ADD     R2, R1, R1
  34         ADD     R2, R0, R3
  35         BIC     $15, R2, R4
  36         CBZ     R4, _bloop1
  37         SUB     R4, R3, R4
  38
  39 _bloop16:
  40         MOVP    -16(R1)!, R5, R6
  41         MOVP    R5, R6, -16(R3)!
  42         CMP     R4, R3
  43         BNE     _bloop16
  44
  45 _bloop1:
  46         CMP     R0, R3
  47         BEQ     _done
  48         MOVBU   -1(R1)!, R5
  49         MOVBU   R5, -1(R3)!
  50         B       _bloop1