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Diffstat (limited to '2.3-1/src/fortran/lapack/ilaenv.f')
| -rw-r--r-- | 2.3-1/src/fortran/lapack/ilaenv.f | 552 |
1 files changed, 552 insertions, 0 deletions
diff --git a/2.3-1/src/fortran/lapack/ilaenv.f b/2.3-1/src/fortran/lapack/ilaenv.f new file mode 100644 index 00000000..c375031b --- /dev/null +++ b/2.3-1/src/fortran/lapack/ilaenv.f @@ -0,0 +1,552 @@ + INTEGER FUNCTION ILAENV( ISPEC, NAME, OPTS, N1, N2, N3, N4 ) +* +* -- LAPACK auxiliary routine (version 3.1) -- +* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. +* November 2006 +* +* .. Scalar Arguments .. + CHARACTER*( * ) NAME, OPTS + INTEGER ISPEC, N1, N2, N3, N4 +* .. +* +* Purpose +* ======= +* +* ILAENV is called from the LAPACK routines to choose problem-dependent +* parameters for the local environment. See ISPEC for a description of +* the parameters. +* +* This version provides a set of parameters which should give good, +* but not optimal, performance on many of the currently available +* computers. Users are encouraged to modify this subroutine to set +* the tuning parameters for their particular machine using the option +* and problem size information in the arguments. +* +* This routine will not function correctly if it is converted to all +* lower case. Converting it to all upper case is allowed. +* +* Arguments +* ========= +* +* ISPEC (input) INTEGER +* Specifies the parameter to be returned as the value of +* ILAENV. +* = 1: the optimal blocksize; if this value is 1, an unblocked +* algorithm will give the best performance. +* = 2: the minimum block size for which the block routine +* should be used; if the usable block size is less than +* this value, an unblocked routine should be used. +* = 3: the crossover point (in a block routine, for N less +* than this value, an unblocked routine should be used) +* = 4: the number of shifts, used in the nonsymmetric +* eigenvalue routines (DEPRECATED) +* = 5: the minimum column dimension for blocking to be used; +* rectangular blocks must have dimension at least k by m, +* where k is given by ILAENV(2,...) and m by ILAENV(5,...) +* = 6: the crossover point for the SVD (when reducing an m by n +* matrix to bidiagonal form, if max(m,n)/min(m,n) exceeds +* this value, a QR factorization is used first to reduce +* the matrix to a triangular form.) +* = 7: the number of processors +* = 8: the crossover point for the multishift QR method +* for nonsymmetric eigenvalue problems (DEPRECATED) +* = 9: maximum size of the subproblems at the bottom of the +* computation tree in the divide-and-conquer algorithm +* (used by xGELSD and xGESDD) +* =10: ieee NaN arithmetic can be trusted not to trap +* =11: infinity arithmetic can be trusted not to trap +* 12 <= ISPEC <= 16: +* xHSEQR or one of its subroutines, +* see IPARMQ for detailed explanation +* +* NAME (input) CHARACTER*(*) +* The name of the calling subroutine, in either upper case or +* lower case. +* +* OPTS (input) CHARACTER*(*) +* The character options to the subroutine NAME, concatenated +* into a single character string. For example, UPLO = 'U', +* TRANS = 'T', and DIAG = 'N' for a triangular routine would +* be specified as OPTS = 'UTN'. +* +* N1 (input) INTEGER +* N2 (input) INTEGER +* N3 (input) INTEGER +* N4 (input) INTEGER +* Problem dimensions for the subroutine NAME; these may not all +* be required. +* +* (ILAENV) (output) INTEGER +* >= 0: the value of the parameter specified by ISPEC +* < 0: if ILAENV = -k, the k-th argument had an illegal value. +* +* Further Details +* =============== +* +* The following conventions have been used when calling ILAENV from the +* LAPACK routines: +* 1) OPTS is a concatenation of all of the character options to +* subroutine NAME, in the same order that they appear in the +* argument list for NAME, even if they are not used in determining +* the value of the parameter specified by ISPEC. +* 2) The problem dimensions N1, N2, N3, N4 are specified in the order +* that they appear in the argument list for NAME. N1 is used +* first, N2 second, and so on, and unused problem dimensions are +* passed a value of -1. +* 3) The parameter value returned by ILAENV is checked for validity in +* the calling subroutine. For example, ILAENV is used to retrieve +* the optimal blocksize for STRTRI as follows: +* +* NB = ILAENV( 1, 'STRTRI', UPLO // DIAG, N, -1, -1, -1 ) +* IF( NB.LE.1 ) NB = MAX( 1, N ) +* +* ===================================================================== +* +* .. Local Scalars .. + INTEGER I, IC, IZ, NB, NBMIN, NX + LOGICAL CNAME, SNAME + CHARACTER C1*1, C2*2, C4*2, C3*3, SUBNAM*6 +* .. +* .. Intrinsic Functions .. + INTRINSIC CHAR, ICHAR, INT, MIN, REAL +* .. +* .. External Functions .. + INTEGER IEEECK, IPARMQ + EXTERNAL IEEECK, IPARMQ +* .. +* .. Executable Statements .. +* + GO TO ( 10, 10, 10, 80, 90, 100, 110, 120, + $ 130, 140, 150, 160, 160, 160, 160, 160 )ISPEC +* +* Invalid value for ISPEC +* + ILAENV = -1 + RETURN +* + 10 CONTINUE +* +* Convert NAME to upper case if the first character is lower case. +* + ILAENV = 1 + SUBNAM = NAME + IC = ICHAR( SUBNAM( 1: 1 ) ) + IZ = ICHAR( 'Z' ) + IF( IZ.EQ.90 .OR. IZ.EQ.122 ) THEN +* +* ASCII character set +* + IF( IC.GE.97 .AND. IC.LE.122 ) THEN + SUBNAM( 1: 1 ) = CHAR( IC-32 ) + DO 20 I = 2, 6 + IC = ICHAR( SUBNAM( I: I ) ) + IF( IC.GE.97 .AND. IC.LE.122 ) + $ SUBNAM( I: I ) = CHAR( IC-32 ) + 20 CONTINUE + END IF +* + ELSE IF( IZ.EQ.233 .OR. IZ.EQ.169 ) THEN +* +* EBCDIC character set +* + IF( ( IC.GE.129 .AND. IC.LE.137 ) .OR. + $ ( IC.GE.145 .AND. IC.LE.153 ) .OR. + $ ( IC.GE.162 .AND. IC.LE.169 ) ) THEN + SUBNAM( 1: 1 ) = CHAR( IC+64 ) + DO 30 I = 2, 6 + IC = ICHAR( SUBNAM( I: I ) ) + IF( ( IC.GE.129 .AND. IC.LE.137 ) .OR. + $ ( IC.GE.145 .AND. IC.LE.153 ) .OR. + $ ( IC.GE.162 .AND. IC.LE.169 ) )SUBNAM( I: + $ I ) = CHAR( IC+64 ) + 30 CONTINUE + END IF +* + ELSE IF( IZ.EQ.218 .OR. IZ.EQ.250 ) THEN +* +* Prime machines: ASCII+128 +* + IF( IC.GE.225 .AND. IC.LE.250 ) THEN + SUBNAM( 1: 1 ) = CHAR( IC-32 ) + DO 40 I = 2, 6 + IC = ICHAR( SUBNAM( I: I ) ) + IF( IC.GE.225 .AND. IC.LE.250 ) + $ SUBNAM( I: I ) = CHAR( IC-32 ) + 40 CONTINUE + END IF + END IF +* + C1 = SUBNAM( 1: 1 ) + SNAME = C1.EQ.'S' .OR. C1.EQ.'D' + CNAME = C1.EQ.'C' .OR. C1.EQ.'Z' + IF( .NOT.( CNAME .OR. SNAME ) ) + $ RETURN + C2 = SUBNAM( 2: 3 ) + C3 = SUBNAM( 4: 6 ) + C4 = C3( 2: 3 ) +* + GO TO ( 50, 60, 70 )ISPEC +* + 50 CONTINUE +* +* ISPEC = 1: block size +* +* In these examples, separate code is provided for setting NB for +* real and complex. We assume that NB will take the same value in +* single or double precision. +* + NB = 1 +* + IF( C2.EQ.'GE' ) THEN + IF( C3.EQ.'TRF' ) THEN + IF( SNAME ) THEN + NB = 64 + ELSE + NB = 64 + END IF + ELSE IF( C3.EQ.'QRF' .OR. C3.EQ.'RQF' .OR. C3.EQ.'LQF' .OR. + $ C3.EQ.'QLF' ) THEN + IF( SNAME ) THEN + NB = 32 + ELSE + NB = 32 + END IF + ELSE IF( C3.EQ.'HRD' ) THEN + IF( SNAME ) THEN + NB = 32 + ELSE + NB = 32 + END IF + ELSE IF( C3.EQ.'BRD' ) THEN + IF( SNAME ) THEN + NB = 32 + ELSE + NB = 32 + END IF + ELSE IF( C3.EQ.'TRI' ) THEN + IF( SNAME ) THEN + NB = 64 + ELSE + NB = 64 + END IF + END IF + ELSE IF( C2.EQ.'PO' ) THEN + IF( C3.EQ.'TRF' ) THEN + IF( SNAME ) THEN + NB = 64 + ELSE + NB = 64 + END IF + END IF + ELSE IF( C2.EQ.'SY' ) THEN + IF( C3.EQ.'TRF' ) THEN + IF( SNAME ) THEN + NB = 64 + ELSE + NB = 64 + END IF + ELSE IF( SNAME .AND. C3.EQ.'TRD' ) THEN + NB = 32 + ELSE IF( SNAME .AND. C3.EQ.'GST' ) THEN + NB = 64 + END IF + ELSE IF( CNAME .AND. C2.EQ.'HE' ) THEN + IF( C3.EQ.'TRF' ) THEN + NB = 64 + ELSE IF( C3.EQ.'TRD' ) THEN + NB = 32 + ELSE IF( C3.EQ.'GST' ) THEN + NB = 64 + END IF + ELSE IF( SNAME .AND. C2.EQ.'OR' ) THEN + IF( C3( 1: 1 ).EQ.'G' ) THEN + IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. + $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) + $ THEN + NB = 32 + END IF + ELSE IF( C3( 1: 1 ).EQ.'M' ) THEN + IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. + $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) + $ THEN + NB = 32 + END IF + END IF + ELSE IF( CNAME .AND. C2.EQ.'UN' ) THEN + IF( C3( 1: 1 ).EQ.'G' ) THEN + IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. + $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) + $ THEN + NB = 32 + END IF + ELSE IF( C3( 1: 1 ).EQ.'M' ) THEN + IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. + $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) + $ THEN + NB = 32 + END IF + END IF + ELSE IF( C2.EQ.'GB' ) THEN + IF( C3.EQ.'TRF' ) THEN + IF( SNAME ) THEN + IF( N4.LE.64 ) THEN + NB = 1 + ELSE + NB = 32 + END IF + ELSE + IF( N4.LE.64 ) THEN + NB = 1 + ELSE + NB = 32 + END IF + END IF + END IF + ELSE IF( C2.EQ.'PB' ) THEN + IF( C3.EQ.'TRF' ) THEN + IF( SNAME ) THEN + IF( N2.LE.64 ) THEN + NB = 1 + ELSE + NB = 32 + END IF + ELSE + IF( N2.LE.64 ) THEN + NB = 1 + ELSE + NB = 32 + END IF + END IF + END IF + ELSE IF( C2.EQ.'TR' ) THEN + IF( C3.EQ.'TRI' ) THEN + IF( SNAME ) THEN + NB = 64 + ELSE + NB = 64 + END IF + END IF + ELSE IF( C2.EQ.'LA' ) THEN + IF( C3.EQ.'UUM' ) THEN + IF( SNAME ) THEN + NB = 64 + ELSE + NB = 64 + END IF + END IF + ELSE IF( SNAME .AND. C2.EQ.'ST' ) THEN + IF( C3.EQ.'EBZ' ) THEN + NB = 1 + END IF + END IF + ILAENV = NB + RETURN +* + 60 CONTINUE +* +* ISPEC = 2: minimum block size +* + NBMIN = 2 + IF( C2.EQ.'GE' ) THEN + IF( C3.EQ.'QRF' .OR. C3.EQ.'RQF' .OR. C3.EQ.'LQF' .OR. C3.EQ. + $ 'QLF' ) THEN + IF( SNAME ) THEN + NBMIN = 2 + ELSE + NBMIN = 2 + END IF + ELSE IF( C3.EQ.'HRD' ) THEN + IF( SNAME ) THEN + NBMIN = 2 + ELSE + NBMIN = 2 + END IF + ELSE IF( C3.EQ.'BRD' ) THEN + IF( SNAME ) THEN + NBMIN = 2 + ELSE + NBMIN = 2 + END IF + ELSE IF( C3.EQ.'TRI' ) THEN + IF( SNAME ) THEN + NBMIN = 2 + ELSE + NBMIN = 2 + END IF + END IF + ELSE IF( C2.EQ.'SY' ) THEN + IF( C3.EQ.'TRF' ) THEN + IF( SNAME ) THEN + NBMIN = 8 + ELSE + NBMIN = 8 + END IF + ELSE IF( SNAME .AND. C3.EQ.'TRD' ) THEN + NBMIN = 2 + END IF + ELSE IF( CNAME .AND. C2.EQ.'HE' ) THEN + IF( C3.EQ.'TRD' ) THEN + NBMIN = 2 + END IF + ELSE IF( SNAME .AND. C2.EQ.'OR' ) THEN + IF( C3( 1: 1 ).EQ.'G' ) THEN + IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. + $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) + $ THEN + NBMIN = 2 + END IF + ELSE IF( C3( 1: 1 ).EQ.'M' ) THEN + IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. + $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) + $ THEN + NBMIN = 2 + END IF + END IF + ELSE IF( CNAME .AND. C2.EQ.'UN' ) THEN + IF( C3( 1: 1 ).EQ.'G' ) THEN + IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. + $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) + $ THEN + NBMIN = 2 + END IF + ELSE IF( C3( 1: 1 ).EQ.'M' ) THEN + IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. + $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) + $ THEN + NBMIN = 2 + END IF + END IF + END IF + ILAENV = NBMIN + RETURN +* + 70 CONTINUE +* +* ISPEC = 3: crossover point +* + NX = 0 + IF( C2.EQ.'GE' ) THEN + IF( C3.EQ.'QRF' .OR. C3.EQ.'RQF' .OR. C3.EQ.'LQF' .OR. C3.EQ. + $ 'QLF' ) THEN + IF( SNAME ) THEN + NX = 128 + ELSE + NX = 128 + END IF + ELSE IF( C3.EQ.'HRD' ) THEN + IF( SNAME ) THEN + NX = 128 + ELSE + NX = 128 + END IF + ELSE IF( C3.EQ.'BRD' ) THEN + IF( SNAME ) THEN + NX = 128 + ELSE + NX = 128 + END IF + END IF + ELSE IF( C2.EQ.'SY' ) THEN + IF( SNAME .AND. C3.EQ.'TRD' ) THEN + NX = 32 + END IF + ELSE IF( CNAME .AND. C2.EQ.'HE' ) THEN + IF( C3.EQ.'TRD' ) THEN + NX = 32 + END IF + ELSE IF( SNAME .AND. C2.EQ.'OR' ) THEN + IF( C3( 1: 1 ).EQ.'G' ) THEN + IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. + $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) + $ THEN + NX = 128 + END IF + END IF + ELSE IF( CNAME .AND. C2.EQ.'UN' ) THEN + IF( C3( 1: 1 ).EQ.'G' ) THEN + IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. + $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) + $ THEN + NX = 128 + END IF + END IF + END IF + ILAENV = NX + RETURN +* + 80 CONTINUE +* +* ISPEC = 4: number of shifts (used by xHSEQR) +* + ILAENV = 6 + RETURN +* + 90 CONTINUE +* +* ISPEC = 5: minimum column dimension (not used) +* + ILAENV = 2 + RETURN +* + 100 CONTINUE +* +* ISPEC = 6: crossover point for SVD (used by xGELSS and xGESVD) +* + ILAENV = INT( REAL( MIN( N1, N2 ) )*1.6E0 ) + RETURN +* + 110 CONTINUE +* +* ISPEC = 7: number of processors (not used) +* + ILAENV = 1 + RETURN +* + 120 CONTINUE +* +* ISPEC = 8: crossover point for multishift (used by xHSEQR) +* + ILAENV = 50 + RETURN +* + 130 CONTINUE +* +* ISPEC = 9: maximum size of the subproblems at the bottom of the +* computation tree in the divide-and-conquer algorithm +* (used by xGELSD and xGESDD) +* + ILAENV = 25 + RETURN +* + 140 CONTINUE +* +* ISPEC = 10: ieee NaN arithmetic can be trusted not to trap +* +* ILAENV = 0 + ILAENV = 1 + IF( ILAENV.EQ.1 ) THEN + ILAENV = IEEECK( 0, 0.0, 1.0 ) + END IF + RETURN +* + 150 CONTINUE +* +* ISPEC = 11: infinity arithmetic can be trusted not to trap +* +* ILAENV = 0 + ILAENV = 1 + IF( ILAENV.EQ.1 ) THEN + ILAENV = IEEECK( 1, 0.0, 1.0 ) + END IF + RETURN +* + 160 CONTINUE +* +* 12 <= ISPEC <= 16: xHSEQR or one of its subroutines. +* + ILAENV = IPARMQ( ISPEC, NAME, OPTS, N1, N2, N3, N4 ) + RETURN +* +* End of ILAENV +* + END |