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177 lines
5.8 KiB
Fortran
177 lines
5.8 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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SUBROUTINE CSRSV (UPLO,TRANS,DIAG,N,AS,JA,IA,B,X)
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use psb_const_mod
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use psb_string_mod
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complex(psb_spk_) ZERO
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PARAMETER (ZERO = (0.0, 0.0))
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INTEGER N
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CHARACTER DIAG, TRANS, UPLO
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complex(psb_spk_) AS(*), B(*), X(*)
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INTEGER IA(*), JA(*)
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complex(psb_spk_) ACC
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INTEGER I, J, K
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LOGICAL LOW, TRA, COTRA, UNI
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UNI = (psb_toupper(DIAG).EQ.'U')
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TRA = (psb_toupper(TRANS).EQ.'T')
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COTRA = (psb_toupper(TRANS).EQ.'C')
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LOW = (psb_toupper(UPLO).EQ.'L')
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IF ((.NOT.TRA).AND.(.NOT.COTRA)) THEN
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IF (LOW) THEN
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IF (.NOT.UNI) THEN
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DO 40 I = 1, N
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ACC = ZERO
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DO 20 J = IA(I), IA(I+1) - 2
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ACC = ACC + AS(J)*X(JA(J))
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20 CONTINUE
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X(I) = (B(I)-ACC)/AS(IA(I+1)-1)
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40 CONTINUE
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ELSE IF (UNI) THEN
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DO 80 I = 1, N
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ACC = ZERO
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DO 60 J = IA(I), IA(I+1) - 1
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ACC = ACC + AS(J)*X(JA(J))
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60 CONTINUE
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X(I) = B(I) - ACC
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80 CONTINUE
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END IF
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ELSE IF (.NOT.LOW) THEN
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IF (.NOT.UNI) THEN
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DO 120 I = N, 1, -1
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ACC = ZERO
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DO 100 J = IA(I) + 1, IA(I+1) - 1
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ACC = ACC + AS(J)*X(JA(J))
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100 CONTINUE
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X(I) = (B(I)-ACC)/AS(IA(I))
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120 CONTINUE
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ELSE IF (UNI) THEN
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DO 160 I = N, 1, -1
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ACC = ZERO
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DO 140 J = IA(I), IA(I+1) - 1
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ACC = ACC + AS(J)*X(JA(J))
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140 CONTINUE
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X(I) = B(I) - ACC
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160 CONTINUE
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END IF
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END IF
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ELSE IF (TRA) THEN
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DO 180 I = 1, N
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X(I) = B(I)
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180 CONTINUE
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IF (LOW) THEN
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IF (.NOT.UNI) THEN
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DO 220 I = N, 1, -1
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X(I) = X(I)/AS(IA(I+1)-1)
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ACC = X(I)
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DO 200 J = IA(I), IA(I+1) - 2
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K = JA(J)
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X(K) = X(K) - AS(J)*ACC
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200 CONTINUE
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220 CONTINUE
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ELSE IF (UNI) THEN
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DO 260 I = N, 1, -1
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ACC = X(I)
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DO 240 J = IA(I), IA(I+1) - 1
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K = JA(J)
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X(K) = X(K) - AS(J)*ACC
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240 CONTINUE
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260 CONTINUE
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END IF
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ELSE IF (.NOT.LOW) THEN
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IF (.NOT.UNI) THEN
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DO 300 I = 1, N
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X(I) = X(I)/AS(IA(I))
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ACC = X(I)
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DO 280 J = IA(I) + 1, IA(I+1) - 1
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K = JA(J)
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X(K) = X(K) - AS(J)*ACC
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280 CONTINUE
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300 CONTINUE
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ELSE IF (UNI) THEN
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DO 340 I = 1, N
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ACC = X(I)
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DO 320 J = IA(I), IA(I+1) - 1
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K = JA(J)
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X(K) = X(K) - AS(J)*ACC
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320 CONTINUE
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340 CONTINUE
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END IF
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END IF
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ELSE IF (COTRA) THEN
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DO 580 I = 1, N
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X(I) = B(I)
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580 CONTINUE
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IF (LOW) THEN
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IF (.NOT.UNI) THEN
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DO 620 I = N, 1, -1
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X(I) = X(I)/CONJG(AS(IA(I+1)-1))
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ACC = X(I)
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DO 600 J = IA(I), IA(I+1) - 2
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K = JA(J)
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X(K) = X(K) - CONJG(AS(J))*ACC
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600 CONTINUE
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620 CONTINUE
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ELSE IF (UNI) THEN
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DO 660 I = N, 1, -1
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ACC = X(I)
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DO 640 J = IA(I), IA(I+1) - 1
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K = JA(J)
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X(K) = X(K) - CONJG(AS(J))*ACC
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640 CONTINUE
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660 CONTINUE
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END IF
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ELSE IF (.NOT.LOW) THEN
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IF (.NOT.UNI) THEN
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DO 700 I = 1, N
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X(I) = X(I)/CONJG(AS(IA(I)))
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ACC = X(I)
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DO 680 J = IA(I) + 1, IA(I+1) - 1
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K = JA(J)
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X(K) = X(K) - CONJG(AS(J))*ACC
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680 CONTINUE
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700 CONTINUE
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ELSE IF (UNI) THEN
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DO 740 I = 1, N
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ACC = X(I)
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DO 720 J = IA(I), IA(I+1) - 1
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K = JA(J)
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X(K) = X(K) - CONJG(AS(J))*ACC
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720 CONTINUE
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740 CONTINUE
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END IF
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END IF
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END IF
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RETURN
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END
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