ref: 897140071501dca8d2e54a943a451f2f61d4d51d dir: /memcpyf.s/
TEXT memcpyf(SB),1,$0 MOVQ RARG, DI MOVQ DI, AX MOVQ p2+8(FP), SI MOVL n+16(FP), CX CLD; REP; MOVSB RET