TEXT    memcmp(SB),$0

       MOVL    n+8(FP), BX
       CMPL    BX, $0
       JEQ     none
       MOVL    p1+0(FP), DI
       MOVL    p2+4(FP), SI
       CLD
/*
* first by longs
*/

       MOVL    BX, CX
       SHRL    $2, CX

       REP;    CMPSL
       JNE     found

/*
* then by bytes
*/
       ANDL    $3, BX
       MOVL    BX, CX
       REP;    CMPSB
       JNE     found1

none:
       MOVL    $0, AX
       RET

/*
* if long found,
* back up and look by bytes
*/
found:
       MOVL    $4, CX
       SUBL    CX, DI
       SUBL    CX, SI
       REP;    CMPSB

found1:
       JLS     lt
       MOVL    $-1, AX
       RET
lt:
       MOVL    $1, AX
       RET

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