ref: dbd01bfc19ff9d22b81e0525f7bdccc4e8adde35
dir: /sys/src/libc/386/strcat.s/
TEXT strcat(SB),$0 MOVL $0, AX MOVL $-1, CX CLD /* * find length of second string */ MOVL p2+4(FP), DI REPN; SCASB MOVL DI, BX SUBL p2+4(FP), BX /* * find end of first string */ MOVL p1+0(FP), DI REPN; SCASB /* * copy the memory */ SUBL $1, DI MOVL p2+4(FP), SI /* * copy whole longs */ MOVL BX, CX SHRL $2, CX REP; MOVSL /* * copy the rest, by bytes */ ANDL $3, BX MOVL BX, CX REP; MOVSB MOVL p1+0(FP), AX RET