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TEXT mpvecadd(SB),$0
        MOVW    alen+4(FP), R4
        MOVW    b+8(FP), R5
        MOVW    blen+12(FP), R6
        MOVW    sum+16(FP), R7
        MOVW    $0, R8
        MOVW    R8, R3
        CMP     R8, R6
        B.EQ    _add1
        SUB     R6, R4, R4
_addloop1:
        MOVW.P  4(R0), R1
        MOVW.P  4(R5), R2
        CMP     $1, R3
        ADC.S   R2, R1
        ADC     R8, R8, R3
        MOVW.P  R1, 4(R7)
        SUB.S   $1, R6
        B.NE    _addloop1
_add1:
        CMP     R8, R4
        B.EQ    _addend
_addloop2:
        MOVW.P  4(R0), R1
        ADD.S   R3, R1
        ADC     R8, R8, R3
        MOVW.P  R1, 4(R7)
        SUB.S   $1, R4
        B.NE    _addloop2
_addend:
        MOVW    R3, (R7)
        RET
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