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SAXPY

       SUBROUTINE SAXPY(N,SA,SX,INCX,SY,INCY)
       REAL SX(1),SY(1),SA
       INTEGER INCX,INCY,N
 C
 C     CONSTANT TIMES A VECTOR PLUS A VECTOR.
 C     USES UNROLLED LOOP FOR INCREMENTS EQUAL TO ONE.
 C     JACK DONGARRA, LINPACK, 3/11/78.
 C