!>
!>    DAXPY constant times a vector plus a vector.
!>    uses unrolled loops for increments equal to one.
!> 

N

!>          N is INTEGER
!>         number of elements in input vector(s)
!> 

DA

!>          DA is DOUBLE PRECISION
!>           On entry, DA specifies the scalar alpha.
!> 

DX

!>          DX is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
!> 

INCX

!>          INCX is INTEGER
!>         storage spacing between elements of DX
!> 

DY

!>          DY is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCY ) )
!> 

INCY

!>          INCY is INTEGER
!>         storage spacing between elements of DY
!> 

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!>
!>     jack dongarra, linpack, 3/11/78.
!>     modified 12/3/93, array(1) declarations changed to array(*)
!>