ref: 4983adfa2cd403eda22d862917c2ff5ed35b48b3
dir: /sys/src/libc/arm64/memmove.s/
TEXT memcpy(SB), $-4 TEXT memmove(SB), $-4 MOV from+8(FP), R1 MOVWU n+16(FP), R2 CMP R0, R1 BEQ _done BLT _backward _forward: MOV R0, R7 ADD R0, R2, R3 BIC $15, R2, R4 CBZ R4, _floop1 ADD R0, R4, R4 _floop16: MOVP (R1)16!, R5, R6 MOVP R5, R6, (R7)16! CMP R4, R7 BNE _floop16 _floop1: CMP R3, R7 BEQ _done MOVBU (R1)1!, R5 MOVBU R5, (R7)1! B _floop1 _done: RETURN _backward: ADD R2, R1, R1 ADD R2, R0, R3 BIC $15, R2, R4 CBZ R4, _bloop1 SUB R4, R3, R4 _bloop16: MOVP -16(R1)!, R5, R6 MOVP R5, R6, -16(R3)! CMP R4, R3 BNE _bloop16 _bloop1: CMP R0, R3 BEQ _done MOVBU -1(R1)!, R5 MOVBU R5, -1(R3)! B _bloop1