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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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