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SUBROUTINE PSLASRT( ID, N, D, Q, IQ, JQ, DESCQ, WORK, LWORK,
$ IWORK, LIWORK, INFO )
*
* -- ScaLAPACK auxiliary routine (version 2.0.2) --
* Univ. of Tennessee, Univ. of California Berkeley, Univ. of Colorado Denver
* May 1 2012
*
* .. Scalar Arguments ..
CHARACTER ID
INTEGER INFO, IQ, JQ, LIWORK, LWORK, N
* ..
* .. Array Arguments ..
INTEGER DESCQ( * ), IWORK( * )
REAL D( * ), Q( * ), WORK( * )
* ..
*
* Purpose
* =======
*
* PSLASRT Sort the numbers in D in increasing order and the
* corresponding vectors in Q.
*
* Arguments
* =========
*
* ID (global input) CHARACTER*1
* = 'I': sort D in increasing order;
* = 'D': sort D in decreasing order. (NOT IMPLEMENTED YET)
*
* N (global input) INTEGER
* The number of columns to be operated on i.e the number of
* columns of the distributed submatrix sub( Q ). N >= 0.
*
* D (global input/output) REAL array, dimmension (N)
* On exit, the number in D are sorted in increasing order.
*
* Q (local input) REAL pointer into the local memory
* to an array of dimension (LLD_Q, LOCc(JQ+N-1) ). This array
* contains the local pieces of the distributed matrix sub( A )
* to be copied from.
*
* IQ (global input) INTEGER
* The row index in the global array A indicating the first
* row of sub( Q ).
*
* JQ (global input) INTEGER
* The column index in the global array A indicating the
* first column of sub( Q ).
*
* DESCQ (global and local input) INTEGER array of dimension DLEN_.
* The array descriptor for the distributed matrix A.
*
* WORK (local workspace/local output) REAL array,
* dimension (LWORK)
* LWORK (local or global input) INTEGER
* The dimension of the array WORK.
* LWORK = MAX( N, NP * ( NB + NQ ))
* where
* NP = NUMROC( N, NB, MYROW, IAROW, NPROW ),
* NQ = NUMROC( N, NB, MYCOL, DESCQ( CSRC_ ), NPCOL )
*
* IWORK (local workspace/local output) INTEGER array,
* dimension (LIWORK)
*
* LIWORK (local or global input) INTEGER
* The dimension of the array IWORK.
* LIWORK = N + 2*NB + 2*NPCOL
*
* INFO (global output) INTEGER
* = 0: successful exit
* < 0: If the i-th argument is an array and the j-entry had
* an illegal value, then INFO = -(i*100+j), if the i-th
* argument is a scalar and had an illegal value, then
* INFO = -i.
*
* =====================================================================
*
* .. Parameters ..
INTEGER BLOCK_CYCLIC_2D, DLEN_, DTYPE_, CTXT_, M_, N_,
$ MB_, NB_, RSRC_, CSRC_, LLD_
PARAMETER ( BLOCK_CYCLIC_2D = 1, DLEN_ = 9, DTYPE_ = 1,
$ CTXT_ = 2, M_ = 3, N_ = 4, MB_ = 5, NB_ = 6,
$ RSRC_ = 7, CSRC_ = 8, LLD_ = 9 )
* ..
* .. Local Scalars ..
INTEGER CL, COL, DUMMY, I, ICTXT, IID, IIQ, INDCOL,
$ INDX, INDXC, INDXG, IPQ, IPQ2, IPW, IPWORK, J,
$ JJQ, K, L, LDQ, LEND, LIWMIN, LWMIN, MYCOL,
$ MYROW, NB, ND, NP, NPCOL, NPROW, NQ, PSQ, QCOL,
$ QTOT, SBUF
* ..
* .. External Functions ..
LOGICAL LSAME
INTEGER INDXG2L, INDXG2P, NUMROC
EXTERNAL INDXG2L, INDXG2P, LSAME, NUMROC
* ..
* .. External Subroutines ..
EXTERNAL BLACS_GRIDINFO, CHK1MAT, PXERBLA, SCOPY,
$ SGERV2D, SGESD2D, SLAMOV, SLAPST
* ..
* .. Intrinsic Functions ..
INTRINSIC MAX, MIN, MOD
* ..
* .. Executable Statements ..
*
* This is just to keep ftnchek and toolpack/1 happy
IF( BLOCK_CYCLIC_2D*CSRC_*CTXT_*DLEN_*DTYPE_*LLD_*MB_*M_*NB_*N_*
$ RSRC_.LT.0 )RETURN
*
IF( N.EQ.0 )
$ RETURN
*
ICTXT = DESCQ( CTXT_ )
CALL BLACS_GRIDINFO( ICTXT, NPROW, NPCOL, MYROW, MYCOL )
*
* Test the input parameters
*
INFO = 0
IF( NPROW.EQ.-1 ) THEN
INFO = -( 600+CTXT_ )
ELSE
CALL CHK1MAT( N, 1, N, 1, IQ, JQ, DESCQ, 6, INFO )
IF( INFO.EQ.0 ) THEN
NB = DESCQ( NB_ )
LDQ = DESCQ( LLD_ )
NP = NUMROC( N, NB, MYROW, DESCQ( RSRC_ ), NPROW )
NQ = NUMROC( N, NB, MYCOL, DESCQ( CSRC_ ), NPCOL )
LWMIN = MAX( N, NP*( NB+NQ ) )
LIWMIN = N + 2*( NB+NPCOL )
IF( .NOT.LSAME( ID, 'I' ) ) THEN
INFO = -1
ELSE IF( N.LT.0 ) THEN
INFO = -2
ELSE IF( LWORK.LT.LWMIN ) THEN
INFO = -9
ELSE IF( LIWORK.LT.LIWMIN ) THEN
INFO = -11
END IF
END IF
END IF
*
IF( INFO.NE.0 ) THEN
CALL PXERBLA( ICTXT, 'PSLASRT', -INFO )
RETURN
END IF
*
* Set Pointers
*
INDXC = 1
INDX = INDXC + N
INDXG = INDX
INDCOL = INDXG + NB
QTOT = INDCOL + NB
PSQ = QTOT + NPCOL
*
IID = 1
IPQ2 = 1
IPW = IPQ2 + NP*NQ
*
DUMMY = 0
IIQ = INDXG2L( IQ, NB, DUMMY, DUMMY, NPROW )
*
* Sort the eigenvalues in D
*
CALL SLAPST( 'I', N, D, IWORK( INDX ), INFO )
*
DO 10 L = 0, N - 1
WORK( IID+L ) = D( IWORK( INDX+L ) )
IWORK( INDXC-1+IWORK( INDX+L ) ) = IID + L
10 CONTINUE
CALL SCOPY( N, WORK, 1, D, 1 )
*
ND = 0
20 CONTINUE
IF( ND.LT.N ) THEN
LEND = MIN( NB, N-ND )
J = JQ + ND
QCOL = INDXG2P( J, NB, DUMMY, DESCQ( CSRC_ ), NPCOL )
K = 0
DO 30 L = 0, LEND - 1
I = JQ - 1 + IWORK( INDXC+ND+L )
CL = INDXG2P( I, NB, DUMMY, DESCQ( CSRC_ ), NPCOL )
IWORK( INDCOL+L ) = CL
IF( MYCOL.EQ.CL ) THEN
IWORK( INDXG+K ) = IWORK( INDXC+ND+L )
K = K + 1
END IF
30 CONTINUE
*
IF( MYCOL.EQ.QCOL ) THEN
DO 40 CL = 0, NPCOL - 1
IWORK( QTOT+CL ) = 0
40 CONTINUE
DO 50 L = 0, LEND - 1
IWORK( QTOT+IWORK( INDCOL+L ) ) = IWORK( QTOT+
$ IWORK( INDCOL+L ) ) + 1
50 CONTINUE
IWORK( PSQ ) = 1
DO 60 CL = 1, NPCOL - 1
IWORK( PSQ+CL ) = IWORK( PSQ+CL-1 ) + IWORK( QTOT+CL-1 )
60 CONTINUE
DO 70 L = 0, LEND - 1
CL = IWORK( INDCOL+L )
I = JQ + ND + L
JJQ = INDXG2L( I, NB, DUMMY, DUMMY, NPCOL )
IPQ = IIQ + ( JJQ-1 )*LDQ
IPWORK = IPW + ( IWORK( PSQ+CL )-1 )*NP
CALL SCOPY( NP, Q( IPQ ), 1, WORK( IPWORK ), 1 )
IWORK( PSQ+CL ) = IWORK( PSQ+CL ) + 1
70 CONTINUE
IWORK( PSQ ) = 1
DO 80 CL = 1, NPCOL - 1
IWORK( PSQ+CL ) = IWORK( PSQ+CL-1 ) + IWORK( QTOT+CL-1 )
80 CONTINUE
DO 90 L = 0, K - 1
I = IWORK( INDXG+L )
JJQ = INDXG2L( I, NB, DUMMY, DUMMY, NPCOL )
IPQ = IPQ2 + ( JJQ-1 )*NP
IPWORK = IPW + ( IWORK( PSQ+MYCOL )-1 )*NP
CALL SCOPY( NP, WORK( IPWORK ), 1, WORK( IPQ ), 1 )
IWORK( PSQ+MYCOL ) = IWORK( PSQ+MYCOL ) + 1
90 CONTINUE
DO 100 CL = 1, NPCOL - 1
COL = MOD( MYCOL+CL, NPCOL )
SBUF = IWORK( QTOT+COL )
IF( SBUF.NE.0 ) THEN
IPWORK = IPW + ( IWORK( PSQ+COL )-1 )*NP
CALL SGESD2D( DESCQ( CTXT_ ), NP, SBUF,
$ WORK( IPWORK ), NP, MYROW, COL )
END IF
100 CONTINUE
*
ELSE
*
IF( K.NE.0 ) THEN
CALL SGERV2D( DESCQ( CTXT_ ), NP, K, WORK( IPW ), NP,
$ MYROW, QCOL )
DO 110 L = 0, K - 1
I = JQ - 1 + IWORK( INDXG+L )
JJQ = INDXG2L( I, NB, DUMMY, DUMMY, NPCOL )
IPQ = 1 + ( JJQ-1 )*NP
IPWORK = IPW + L*NP
CALL SCOPY( NP, WORK( IPWORK ), 1, WORK( IPQ ), 1 )
110 CONTINUE
END IF
END IF
ND = ND + NB
GO TO 20
END IF
CALL SLAMOV( 'Full', NP, NQ, WORK, NP, Q( IIQ ), LDQ )
*
* End of PSLASRT
*
END
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