TEXT    memchr(SB),$0

       MOVL    n+8(FP), CX
       CMPL    CX, $0
       JEQ     none
       MOVL    p+0(FP), DI
       MOVBLZX c+4(FP), AX
       CLD
/*
* SCASB is memchr instruction
*/

       REPN;   SCASB
       JEQ     found

none:
       MOVL    $0, AX
       RET

found:
       MOVL    DI, AX
       SUBL    $1, AX
       RET

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