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117 lines
3.9 KiB
Fortran
117 lines
3.9 KiB
Fortran
C
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C Parallel Sparse BLAS version 2.2
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C (C) Copyright 2006/2007/2008
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C Salvatore Filippone University of Rome Tor Vergata
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C Alfredo Buttari University of Rome Tor Vergata
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C
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C Redistribution and use in source and binary forms, with or without
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C modification, are permitted provided that the following conditions
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C are met:
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C 1. Redistributions of source code must retain the above copyright
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C notice, this list of conditions and the following disclaimer.
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C 2. Redistributions in binary form must reproduce the above copyright
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C notice, this list of conditions, and the following disclaimer in the
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C documentation and/or other materials provided with the distribution.
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C 3. The name of the PSBLAS group or the names of its contributors may
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C not be used to endorse or promote products derived from this
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C software without specific written permission.
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C
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C THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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C ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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C TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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C PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
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C BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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C CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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C SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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C INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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C CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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C ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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C POSSIBILITY OF SUCH DAMAGE.
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C
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C
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C Subroutine SLPUPD(M,N,PERM,B,LDB,BETA,C,LDC,IERROR)
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C Purpose
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C =======
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C
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C Computing C <-- PERM B + BETA C
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C where PERM is a permutation matrix.
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C
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C Parameters
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C ==========
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C
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C M - INTEGER
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C On entry M specifies the number of rows of matrices
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C B and C.
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C Unchanged on exit.
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C
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C N - INTEGER
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C On entry N specifies the number of columns of matrices
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C B and C.
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C Unchanged on exit.
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C
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C PERM - INTEGER array of dimension (N)
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C On entry PERM specifies the values of a permutation matrix.
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C Unchanged on exit.
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C
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C B - DOUBLE PRECISION matrix of dimension (LDB,*)
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C On entry: dense matrix.
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C Unchanged on exit.
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C
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C LDB - INTEGER
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C On entry LDB holds the value of the leading dimension of B
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C Unchanged on exit.
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C
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C BETA - DOUBLE PRECISION
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C On entry: multiplicative constant.
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C Unchanged on exit.
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C
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C C - DOUBLE PRECISION matrix of dimension (LDC,*)
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C On entry: dense matrix.
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C On exit is updated as shown above.
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C
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C LDC - INTEGER
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C On entry LDC holds the value of the leading dimension of C
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C Unchanged on exit.
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C
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C Note
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C ====
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C All checks on argument are performed in the calling routines.
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C
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C
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SUBROUTINE SLPUPD(M,N,PERM,B,LDB,BETA,C,LDC)
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use psb_const_mod
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C .. Scalar Arguments ..
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INTEGER M, N, LDB, LDC
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real(psb_spk_) BETA
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C .. Array Arguments ..
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INTEGER PERM(*)
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real(psb_spk_) B(LDB,*), C(LDC,*)
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C .. Local Scalars ..
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INTEGER I,J
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C
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C .. Executable Statements ..
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C
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C Switching on BETA
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C
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IF (BETA.NE.SZERO) THEN
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C
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C Performing left permutation and update
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C
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DO 40 J = 1, N
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DO 30 I = 1, M
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C(I,J) = B(PERM(I),J) + BETA*C(I,J)
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30 CONTINUE
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40 CONTINUE
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ELSE IF(BETA.EQ.SZERO) THEN
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C
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C Performing right or left permutation
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C
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DO 160 J = 1, N
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DO 150 I = 1, M
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C(I,J) = B(PERM(I),J)
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150 CONTINUE
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160 CONTINUE
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ENDIF
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RETURN
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END
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