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146 lines
3.1 KiB
146 lines
3.1 KiB
2 years ago
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*> \brief \b ICOPY
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*
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* =========== DOCUMENTATION ===========
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*
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* Online html documentation available at
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* http://www.netlib.org/lapack/explore-html/
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*
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* Definition:
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* ===========
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*
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* SUBROUTINE ICOPY( N, SX, INCX, SY, INCY )
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*
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* .. Scalar Arguments ..
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* INTEGER INCX, INCY, N
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* ..
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* .. Array Arguments ..
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* INTEGER SX( * ), SY( * )
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* ..
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*
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*
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*> \par Purpose:
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* =============
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*>
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*> \verbatim
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*>
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*> ICOPY copies an integer vector x to an integer vector y.
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*> Uses unrolled loops for increments equal to 1.
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*> \endverbatim
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*
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* Arguments:
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* ==========
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*
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*> \param[in] N
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*> \verbatim
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*> N is INTEGER
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*> The length of the vectors SX and SY.
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*> \endverbatim
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*>
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*> \param[in] SX
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*> \verbatim
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*> SX is INTEGER array, dimension (1+(N-1)*abs(INCX))
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*> The vector X.
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*> \endverbatim
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*>
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*> \param[in] INCX
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*> \verbatim
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*> INCX is INTEGER
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*> The spacing between consecutive elements of SX.
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*> \endverbatim
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*>
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*> \param[out] SY
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*> \verbatim
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*> SY is INTEGER array, dimension (1+(N-1)*abs(INCY))
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*> The vector Y.
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*> \endverbatim
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*>
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*> \param[in] INCY
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*> \verbatim
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*> INCY is INTEGER
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*> The spacing between consecutive elements of SY.
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*> \endverbatim
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*
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* Authors:
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* ========
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*
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*> \author Univ. of Tennessee
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*> \author Univ. of California Berkeley
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*> \author Univ. of Colorado Denver
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*> \author NAG Ltd.
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*
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*> \ingroup aux_lin
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*
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* =====================================================================
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SUBROUTINE ICOPY( N, SX, INCX, SY, INCY )
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*
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* -- LAPACK test routine --
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* -- LAPACK is a software package provided by Univ. of Tennessee, --
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* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
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*
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* .. Scalar Arguments ..
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INTEGER INCX, INCY, N
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* ..
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* .. Array Arguments ..
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INTEGER SX( * ), SY( * )
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* ..
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*
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* =====================================================================
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*
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* .. Local Scalars ..
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INTEGER I, IX, IY, M, MP1
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* ..
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* .. Intrinsic Functions ..
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INTRINSIC MOD
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* ..
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* .. Executable Statements ..
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*
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IF( N.LE.0 )
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$ RETURN
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IF( INCX.EQ.1 .AND. INCY.EQ.1 )
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$ GO TO 20
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*
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* Code for unequal increments or equal increments not equal to 1
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*
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IX = 1
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IY = 1
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IF( INCX.LT.0 )
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$ IX = ( -N+1 )*INCX + 1
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IF( INCY.LT.0 )
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$ IY = ( -N+1 )*INCY + 1
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DO 10 I = 1, N
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SY( IY ) = SX( IX )
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IX = IX + INCX
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IY = IY + INCY
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10 CONTINUE
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RETURN
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*
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* Code for both increments equal to 1
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*
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* Clean-up loop
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*
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20 CONTINUE
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M = MOD( N, 7 )
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IF( M.EQ.0 )
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$ GO TO 40
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DO 30 I = 1, M
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SY( I ) = SX( I )
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30 CONTINUE
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IF( N.LT.7 )
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$ RETURN
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40 CONTINUE
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MP1 = M + 1
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DO 50 I = MP1, N, 7
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SY( I ) = SX( I )
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SY( I+1 ) = SX( I+1 )
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SY( I+2 ) = SX( I+2 )
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SY( I+3 ) = SX( I+3 )
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SY( I+4 ) = SX( I+4 )
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SY( I+5 ) = SX( I+5 )
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SY( I+6 ) = SX( I+6 )
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50 CONTINUE
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RETURN
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*
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* End of ICOPY
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*
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END
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