ref: 29c7ca80c9df8f805217be9bb9a9a083ff12912d
dir: /sys/src/libmp/mips/_mpdigdiv.s/
/* * This only works on R[45]000 chips that allow 64 bit * integer arithmetic even when uding 32 bit addresses * * R1 = dividend* * R2 = dividend[low] * R3 = dividend[high] * R4 = 32 bit divisor * R5 = quotient* */ TEXT mpdigdiv(SB),$0 MOVW 0(R1),R2 MOVW 4(R1),R3 MOVW divisor+4(FP),R4 MOVW quotient+8(FP),R5 /* divisor == 0 */ BEQ R4,_digovfl /* dividend >= 2^32 * divisor */ SGTU R4,R3,R7 BEQ R7,_digovfl _digdiv1: SLLV $32,R2 SLLV $32,R3 SRLV $32,R2 ADDVU R2,R3 SLLV $32,R4 SRLV $32,R4 DIVVU R4,R3 MOVW LO,R1 MOVW R1,0(R5) RET _digovfl: MOVW $-1,R1 MOVW R1,0(R5) RET