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SSWAP

       SUBROUTINE  SSWAP (N,SX,INCX,SY,INCY)
 C$    (BLAS - Swap Vectors)
 C$
 C$    Interchanges two vectors.
 C$    Uses unrolled loops for increments equal to 1.
 C$    Jack Dongarra, LINPACK, 3/11/78.
 C$
 C$    (03-APR-82)