ref: c89b0b3c238ff4e288f259be211f3b878bd0c30d
dir: /sys/src/libc/68020/memccpy.s/
TEXT memccpy(SB),$0 MOVL n+12(FP),R0 BEQ ret MOVL s1+0(FP),A2 MOVL s2+4(FP),A1 MOVL c+8(FP),R1 BEQ l2 /* * general case */ l1: MOVB (A1)+,R2 MOVB R2,(A2)+ CMPB R2,R1 BEQ eq SUBL $1,R0 BNE l1 RTS /* * special case for null character */ l2: MOVB (A1)+,(A2)+ BEQ eq SUBL $1,R0 BNE l2 RTS eq: MOVL A2,R0 ret: RTS