TEXT    mpdigdiv(SB),$0

       MOVL    dividend+0(FP),BX
       MOVL    0(BX),AX
       MOVL    4(BX),DX
       MOVL    divisor+4(FP),BX
       MOVL    quotient+8(FP),BP
       XORL    CX,CX
       CMPL    DX,BX           /* dividend >= 2^32 * divisor */
       JHS     _divovfl
       CMPL    BX,CX           /* divisor == 0 */
       JE      _divovfl
       DIVL    BX              /* AX = DX:AX/BX */
       MOVL    AX,0(BP)
       RET

       /* return all 1's */
_divovfl:
       NOTL    CX
       MOVL    CX,0(BP)
       RET

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