ref: 543e6478226a896bfff8e749c53dc41cfc42ed4d
dir: /sys/src/ape/lib/ap/68020/memset.s/
TEXT memset(SB), $0 MOVL n+8(FP), R0 BLE return MOVL s1+0(FP), A1 CLRL R1 MOVB c+7(FP), R1 BEQ l1 /* * create 4 replicated copies * of the byte in R1 */ MOVL R1, R2 ASLL $8, R2 ORL R2, R1 MOVL R1, R2 SWAP R2 ORL R2, R1 /* * quad-long-at-a-time set * destination allignment is not * very important. */ l1: SUBL $16, R0 BLT l2 MOVL R1, (A1)+ MOVL R1, (A1)+ MOVL R1, (A1)+ MOVL R1, (A1)+ BRA l1 /* * cleanup byte-at-a-time */ l2: ADDL $15, R0 BLT return l3: MOVB R1, (A1)+ SUBL $1, R0 BGE l3 return: MOVL s1+0(FP),R0 RTS