root / src / lapack / util / ilaenv.f @ 7
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| 1 | 1 | pfleura2 | INTEGER FUNCTION ILAENV( ISPEC, NAME, OPTS, N1, N2, N3, N4 ) |
|---|---|---|---|
| 2 | 1 | pfleura2 | * |
| 3 | 1 | pfleura2 | * -- LAPACK auxiliary routine (version 3.2.1) -- |
| 4 | 1 | pfleura2 | * |
| 5 | 1 | pfleura2 | * -- April 2009 -- |
| 6 | 1 | pfleura2 | * |
| 7 | 1 | pfleura2 | * -- LAPACK is a software package provided by Univ. of Tennessee, -- |
| 8 | 1 | pfleura2 | * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- |
| 9 | 1 | pfleura2 | * |
| 10 | 1 | pfleura2 | * .. Scalar Arguments .. |
| 11 | 1 | pfleura2 | CHARACTER*( * ) NAME, OPTS |
| 12 | 1 | pfleura2 | INTEGER ISPEC, N1, N2, N3, N4 |
| 13 | 1 | pfleura2 | * .. |
| 14 | 1 | pfleura2 | * |
| 15 | 1 | pfleura2 | * Purpose |
| 16 | 1 | pfleura2 | * ======= |
| 17 | 1 | pfleura2 | * |
| 18 | 1 | pfleura2 | * ILAENV is called from the LAPACK routines to choose problem-dependent |
| 19 | 1 | pfleura2 | * parameters for the local environment. See ISPEC for a description of |
| 20 | 1 | pfleura2 | * the parameters. |
| 21 | 1 | pfleura2 | * |
| 22 | 1 | pfleura2 | * ILAENV returns an INTEGER |
| 23 | 1 | pfleura2 | * if ILAENV >= 0: ILAENV returns the value of the parameter specified by ISPEC |
| 24 | 1 | pfleura2 | * if ILAENV < 0: if ILAENV = -k, the k-th argument had an illegal value. |
| 25 | 1 | pfleura2 | * |
| 26 | 1 | pfleura2 | * This version provides a set of parameters which should give good, |
| 27 | 1 | pfleura2 | * but not optimal, performance on many of the currently available |
| 28 | 1 | pfleura2 | * computers. Users are encouraged to modify this subroutine to set |
| 29 | 1 | pfleura2 | * the tuning parameters for their particular machine using the option |
| 30 | 1 | pfleura2 | * and problem size information in the arguments. |
| 31 | 1 | pfleura2 | * |
| 32 | 1 | pfleura2 | * This routine will not function correctly if it is converted to all |
| 33 | 1 | pfleura2 | * lower case. Converting it to all upper case is allowed. |
| 34 | 1 | pfleura2 | * |
| 35 | 1 | pfleura2 | * Arguments |
| 36 | 1 | pfleura2 | * ========= |
| 37 | 1 | pfleura2 | * |
| 38 | 1 | pfleura2 | * ISPEC (input) INTEGER |
| 39 | 1 | pfleura2 | * Specifies the parameter to be returned as the value of |
| 40 | 1 | pfleura2 | * ILAENV. |
| 41 | 1 | pfleura2 | * = 1: the optimal blocksize; if this value is 1, an unblocked |
| 42 | 1 | pfleura2 | * algorithm will give the best performance. |
| 43 | 1 | pfleura2 | * = 2: the minimum block size for which the block routine |
| 44 | 1 | pfleura2 | * should be used; if the usable block size is less than |
| 45 | 1 | pfleura2 | * this value, an unblocked routine should be used. |
| 46 | 1 | pfleura2 | * = 3: the crossover point (in a block routine, for N less |
| 47 | 1 | pfleura2 | * than this value, an unblocked routine should be used) |
| 48 | 1 | pfleura2 | * = 4: the number of shifts, used in the nonsymmetric |
| 49 | 1 | pfleura2 | * eigenvalue routines (DEPRECATED) |
| 50 | 1 | pfleura2 | * = 5: the minimum column dimension for blocking to be used; |
| 51 | 1 | pfleura2 | * rectangular blocks must have dimension at least k by m, |
| 52 | 1 | pfleura2 | * where k is given by ILAENV(2,...) and m by ILAENV(5,...) |
| 53 | 1 | pfleura2 | * = 6: the crossover point for the SVD (when reducing an m by n |
| 54 | 1 | pfleura2 | * matrix to bidiagonal form, if max(m,n)/min(m,n) exceeds |
| 55 | 1 | pfleura2 | * this value, a QR factorization is used first to reduce |
| 56 | 1 | pfleura2 | * the matrix to a triangular form.) |
| 57 | 1 | pfleura2 | * = 7: the number of processors |
| 58 | 1 | pfleura2 | * = 8: the crossover point for the multishift QR method |
| 59 | 1 | pfleura2 | * for nonsymmetric eigenvalue problems (DEPRECATED) |
| 60 | 1 | pfleura2 | * = 9: maximum size of the subproblems at the bottom of the |
| 61 | 1 | pfleura2 | * computation tree in the divide-and-conquer algorithm |
| 62 | 1 | pfleura2 | * (used by xGELSD and xGESDD) |
| 63 | 1 | pfleura2 | * =10: ieee NaN arithmetic can be trusted not to trap |
| 64 | 1 | pfleura2 | * =11: infinity arithmetic can be trusted not to trap |
| 65 | 1 | pfleura2 | * 12 <= ISPEC <= 16: |
| 66 | 1 | pfleura2 | * xHSEQR or one of its subroutines, |
| 67 | 1 | pfleura2 | * see IPARMQ for detailed explanation |
| 68 | 1 | pfleura2 | * |
| 69 | 1 | pfleura2 | * NAME (input) CHARACTER*(*) |
| 70 | 1 | pfleura2 | * The name of the calling subroutine, in either upper case or |
| 71 | 1 | pfleura2 | * lower case. |
| 72 | 1 | pfleura2 | * |
| 73 | 1 | pfleura2 | * OPTS (input) CHARACTER*(*) |
| 74 | 1 | pfleura2 | * The character options to the subroutine NAME, concatenated |
| 75 | 1 | pfleura2 | * into a single character string. For example, UPLO = 'U', |
| 76 | 1 | pfleura2 | * TRANS = 'T', and DIAG = 'N' for a triangular routine would |
| 77 | 1 | pfleura2 | * be specified as OPTS = 'UTN'. |
| 78 | 1 | pfleura2 | * |
| 79 | 1 | pfleura2 | * N1 (input) INTEGER |
| 80 | 1 | pfleura2 | * N2 (input) INTEGER |
| 81 | 1 | pfleura2 | * N3 (input) INTEGER |
| 82 | 1 | pfleura2 | * N4 (input) INTEGER |
| 83 | 1 | pfleura2 | * Problem dimensions for the subroutine NAME; these may not all |
| 84 | 1 | pfleura2 | * be required. |
| 85 | 1 | pfleura2 | * |
| 86 | 1 | pfleura2 | * Further Details |
| 87 | 1 | pfleura2 | * =============== |
| 88 | 1 | pfleura2 | * |
| 89 | 1 | pfleura2 | * The following conventions have been used when calling ILAENV from the |
| 90 | 1 | pfleura2 | * LAPACK routines: |
| 91 | 1 | pfleura2 | * 1) OPTS is a concatenation of all of the character options to |
| 92 | 1 | pfleura2 | * subroutine NAME, in the same order that they appear in the |
| 93 | 1 | pfleura2 | * argument list for NAME, even if they are not used in determining |
| 94 | 1 | pfleura2 | * the value of the parameter specified by ISPEC. |
| 95 | 1 | pfleura2 | * 2) The problem dimensions N1, N2, N3, N4 are specified in the order |
| 96 | 1 | pfleura2 | * that they appear in the argument list for NAME. N1 is used |
| 97 | 1 | pfleura2 | * first, N2 second, and so on, and unused problem dimensions are |
| 98 | 1 | pfleura2 | * passed a value of -1. |
| 99 | 1 | pfleura2 | * 3) The parameter value returned by ILAENV is checked for validity in |
| 100 | 1 | pfleura2 | * the calling subroutine. For example, ILAENV is used to retrieve |
| 101 | 1 | pfleura2 | * the optimal blocksize for STRTRI as follows: |
| 102 | 1 | pfleura2 | * |
| 103 | 1 | pfleura2 | * NB = ILAENV( 1, 'STRTRI', UPLO // DIAG, N, -1, -1, -1 ) |
| 104 | 1 | pfleura2 | * IF( NB.LE.1 ) NB = MAX( 1, N ) |
| 105 | 1 | pfleura2 | * |
| 106 | 1 | pfleura2 | * ===================================================================== |
| 107 | 1 | pfleura2 | * |
| 108 | 1 | pfleura2 | * .. Local Scalars .. |
| 109 | 1 | pfleura2 | INTEGER I, IC, IZ, NB, NBMIN, NX |
| 110 | 1 | pfleura2 | LOGICAL CNAME, SNAME |
| 111 | 1 | pfleura2 | CHARACTER C1*1, C2*2, C4*2, C3*3, SUBNAM*6 |
| 112 | 1 | pfleura2 | * .. |
| 113 | 1 | pfleura2 | * .. Intrinsic Functions .. |
| 114 | 1 | pfleura2 | INTRINSIC CHAR, ICHAR, INT, MIN, REAL |
| 115 | 1 | pfleura2 | * .. |
| 116 | 1 | pfleura2 | * .. External Functions .. |
| 117 | 1 | pfleura2 | INTEGER IEEECK, IPARMQ |
| 118 | 1 | pfleura2 | EXTERNAL IEEECK, IPARMQ |
| 119 | 1 | pfleura2 | * .. |
| 120 | 1 | pfleura2 | * .. Executable Statements .. |
| 121 | 1 | pfleura2 | * |
| 122 | 1 | pfleura2 | GO TO ( 10, 10, 10, 80, 90, 100, 110, 120, |
| 123 | 1 | pfleura2 | $ 130, 140, 150, 160, 160, 160, 160, 160 )ISPEC |
| 124 | 1 | pfleura2 | * |
| 125 | 1 | pfleura2 | * Invalid value for ISPEC |
| 126 | 1 | pfleura2 | * |
| 127 | 1 | pfleura2 | ILAENV = -1 |
| 128 | 1 | pfleura2 | RETURN |
| 129 | 1 | pfleura2 | * |
| 130 | 1 | pfleura2 | 10 CONTINUE |
| 131 | 1 | pfleura2 | * |
| 132 | 1 | pfleura2 | * Convert NAME to upper case if the first character is lower case. |
| 133 | 1 | pfleura2 | * |
| 134 | 1 | pfleura2 | ILAENV = 1 |
| 135 | 1 | pfleura2 | SUBNAM = NAME |
| 136 | 1 | pfleura2 | IC = ICHAR( SUBNAM( 1: 1 ) ) |
| 137 | 1 | pfleura2 | IZ = ICHAR( 'Z' ) |
| 138 | 1 | pfleura2 | IF( IZ.EQ.90 .OR. IZ.EQ.122 ) THEN |
| 139 | 1 | pfleura2 | * |
| 140 | 1 | pfleura2 | * ASCII character set |
| 141 | 1 | pfleura2 | * |
| 142 | 1 | pfleura2 | IF( IC.GE.97 .AND. IC.LE.122 ) THEN |
| 143 | 1 | pfleura2 | SUBNAM( 1: 1 ) = CHAR( IC-32 ) |
| 144 | 1 | pfleura2 | DO 20 I = 2, 6 |
| 145 | 1 | pfleura2 | IC = ICHAR( SUBNAM( I: I ) ) |
| 146 | 1 | pfleura2 | IF( IC.GE.97 .AND. IC.LE.122 ) |
| 147 | 1 | pfleura2 | $ SUBNAM( I: I ) = CHAR( IC-32 ) |
| 148 | 1 | pfleura2 | 20 CONTINUE |
| 149 | 1 | pfleura2 | END IF |
| 150 | 1 | pfleura2 | * |
| 151 | 1 | pfleura2 | ELSE IF( IZ.EQ.233 .OR. IZ.EQ.169 ) THEN |
| 152 | 1 | pfleura2 | * |
| 153 | 1 | pfleura2 | * EBCDIC character set |
| 154 | 1 | pfleura2 | * |
| 155 | 1 | pfleura2 | IF( ( IC.GE.129 .AND. IC.LE.137 ) .OR. |
| 156 | 1 | pfleura2 | $ ( IC.GE.145 .AND. IC.LE.153 ) .OR. |
| 157 | 1 | pfleura2 | $ ( IC.GE.162 .AND. IC.LE.169 ) ) THEN |
| 158 | 1 | pfleura2 | SUBNAM( 1: 1 ) = CHAR( IC+64 ) |
| 159 | 1 | pfleura2 | DO 30 I = 2, 6 |
| 160 | 1 | pfleura2 | IC = ICHAR( SUBNAM( I: I ) ) |
| 161 | 1 | pfleura2 | IF( ( IC.GE.129 .AND. IC.LE.137 ) .OR. |
| 162 | 1 | pfleura2 | $ ( IC.GE.145 .AND. IC.LE.153 ) .OR. |
| 163 | 1 | pfleura2 | $ ( IC.GE.162 .AND. IC.LE.169 ) )SUBNAM( I: |
| 164 | 1 | pfleura2 | $ I ) = CHAR( IC+64 ) |
| 165 | 1 | pfleura2 | 30 CONTINUE |
| 166 | 1 | pfleura2 | END IF |
| 167 | 1 | pfleura2 | * |
| 168 | 1 | pfleura2 | ELSE IF( IZ.EQ.218 .OR. IZ.EQ.250 ) THEN |
| 169 | 1 | pfleura2 | * |
| 170 | 1 | pfleura2 | * Prime machines: ASCII+128 |
| 171 | 1 | pfleura2 | * |
| 172 | 1 | pfleura2 | IF( IC.GE.225 .AND. IC.LE.250 ) THEN |
| 173 | 1 | pfleura2 | SUBNAM( 1: 1 ) = CHAR( IC-32 ) |
| 174 | 1 | pfleura2 | DO 40 I = 2, 6 |
| 175 | 1 | pfleura2 | IC = ICHAR( SUBNAM( I: I ) ) |
| 176 | 1 | pfleura2 | IF( IC.GE.225 .AND. IC.LE.250 ) |
| 177 | 1 | pfleura2 | $ SUBNAM( I: I ) = CHAR( IC-32 ) |
| 178 | 1 | pfleura2 | 40 CONTINUE |
| 179 | 1 | pfleura2 | END IF |
| 180 | 1 | pfleura2 | END IF |
| 181 | 1 | pfleura2 | * |
| 182 | 1 | pfleura2 | C1 = SUBNAM( 1: 1 ) |
| 183 | 1 | pfleura2 | SNAME = C1.EQ.'S' .OR. C1.EQ.'D' |
| 184 | 1 | pfleura2 | CNAME = C1.EQ.'C' .OR. C1.EQ.'Z' |
| 185 | 1 | pfleura2 | IF( .NOT.( CNAME .OR. SNAME ) ) |
| 186 | 1 | pfleura2 | $ RETURN |
| 187 | 1 | pfleura2 | C2 = SUBNAM( 2: 3 ) |
| 188 | 1 | pfleura2 | C3 = SUBNAM( 4: 6 ) |
| 189 | 1 | pfleura2 | C4 = C3( 2: 3 ) |
| 190 | 1 | pfleura2 | * |
| 191 | 1 | pfleura2 | GO TO ( 50, 60, 70 )ISPEC |
| 192 | 1 | pfleura2 | * |
| 193 | 1 | pfleura2 | 50 CONTINUE |
| 194 | 1 | pfleura2 | * |
| 195 | 1 | pfleura2 | * ISPEC = 1: block size |
| 196 | 1 | pfleura2 | * |
| 197 | 1 | pfleura2 | * In these examples, separate code is provided for setting NB for |
| 198 | 1 | pfleura2 | * real and complex. We assume that NB will take the same value in |
| 199 | 1 | pfleura2 | * single or double precision. |
| 200 | 1 | pfleura2 | * |
| 201 | 1 | pfleura2 | NB = 1 |
| 202 | 1 | pfleura2 | * |
| 203 | 1 | pfleura2 | IF( C2.EQ.'GE' ) THEN |
| 204 | 1 | pfleura2 | IF( C3.EQ.'TRF' ) THEN |
| 205 | 1 | pfleura2 | IF( SNAME ) THEN |
| 206 | 1 | pfleura2 | NB = 64 |
| 207 | 1 | pfleura2 | ELSE |
| 208 | 1 | pfleura2 | NB = 64 |
| 209 | 1 | pfleura2 | END IF |
| 210 | 1 | pfleura2 | ELSE IF( C3.EQ.'QRF' .OR. C3.EQ.'RQF' .OR. C3.EQ.'LQF' .OR. |
| 211 | 1 | pfleura2 | $ C3.EQ.'QLF' ) THEN |
| 212 | 1 | pfleura2 | IF( SNAME ) THEN |
| 213 | 1 | pfleura2 | NB = 32 |
| 214 | 1 | pfleura2 | ELSE |
| 215 | 1 | pfleura2 | NB = 32 |
| 216 | 1 | pfleura2 | END IF |
| 217 | 1 | pfleura2 | ELSE IF( C3.EQ.'HRD' ) THEN |
| 218 | 1 | pfleura2 | IF( SNAME ) THEN |
| 219 | 1 | pfleura2 | NB = 32 |
| 220 | 1 | pfleura2 | ELSE |
| 221 | 1 | pfleura2 | NB = 32 |
| 222 | 1 | pfleura2 | END IF |
| 223 | 1 | pfleura2 | ELSE IF( C3.EQ.'BRD' ) THEN |
| 224 | 1 | pfleura2 | IF( SNAME ) THEN |
| 225 | 1 | pfleura2 | NB = 32 |
| 226 | 1 | pfleura2 | ELSE |
| 227 | 1 | pfleura2 | NB = 32 |
| 228 | 1 | pfleura2 | END IF |
| 229 | 1 | pfleura2 | ELSE IF( C3.EQ.'TRI' ) THEN |
| 230 | 1 | pfleura2 | IF( SNAME ) THEN |
| 231 | 1 | pfleura2 | NB = 64 |
| 232 | 1 | pfleura2 | ELSE |
| 233 | 1 | pfleura2 | NB = 64 |
| 234 | 1 | pfleura2 | END IF |
| 235 | 1 | pfleura2 | END IF |
| 236 | 1 | pfleura2 | ELSE IF( C2.EQ.'PO' ) THEN |
| 237 | 1 | pfleura2 | IF( C3.EQ.'TRF' ) THEN |
| 238 | 1 | pfleura2 | IF( SNAME ) THEN |
| 239 | 1 | pfleura2 | NB = 64 |
| 240 | 1 | pfleura2 | ELSE |
| 241 | 1 | pfleura2 | NB = 64 |
| 242 | 1 | pfleura2 | END IF |
| 243 | 1 | pfleura2 | END IF |
| 244 | 1 | pfleura2 | ELSE IF( C2.EQ.'SY' ) THEN |
| 245 | 1 | pfleura2 | IF( C3.EQ.'TRF' ) THEN |
| 246 | 1 | pfleura2 | IF( SNAME ) THEN |
| 247 | 1 | pfleura2 | NB = 64 |
| 248 | 1 | pfleura2 | ELSE |
| 249 | 1 | pfleura2 | NB = 64 |
| 250 | 1 | pfleura2 | END IF |
| 251 | 1 | pfleura2 | ELSE IF( SNAME .AND. C3.EQ.'TRD' ) THEN |
| 252 | 1 | pfleura2 | NB = 32 |
| 253 | 1 | pfleura2 | ELSE IF( SNAME .AND. C3.EQ.'GST' ) THEN |
| 254 | 1 | pfleura2 | NB = 64 |
| 255 | 1 | pfleura2 | END IF |
| 256 | 1 | pfleura2 | ELSE IF( CNAME .AND. C2.EQ.'HE' ) THEN |
| 257 | 1 | pfleura2 | IF( C3.EQ.'TRF' ) THEN |
| 258 | 1 | pfleura2 | NB = 64 |
| 259 | 1 | pfleura2 | ELSE IF( C3.EQ.'TRD' ) THEN |
| 260 | 1 | pfleura2 | NB = 32 |
| 261 | 1 | pfleura2 | ELSE IF( C3.EQ.'GST' ) THEN |
| 262 | 1 | pfleura2 | NB = 64 |
| 263 | 1 | pfleura2 | END IF |
| 264 | 1 | pfleura2 | ELSE IF( SNAME .AND. C2.EQ.'OR' ) THEN |
| 265 | 1 | pfleura2 | IF( C3( 1: 1 ).EQ.'G' ) THEN |
| 266 | 1 | pfleura2 | IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. |
| 267 | 1 | pfleura2 | $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) |
| 268 | 1 | pfleura2 | $ THEN |
| 269 | 1 | pfleura2 | NB = 32 |
| 270 | 1 | pfleura2 | END IF |
| 271 | 1 | pfleura2 | ELSE IF( C3( 1: 1 ).EQ.'M' ) THEN |
| 272 | 1 | pfleura2 | IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. |
| 273 | 1 | pfleura2 | $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) |
| 274 | 1 | pfleura2 | $ THEN |
| 275 | 1 | pfleura2 | NB = 32 |
| 276 | 1 | pfleura2 | END IF |
| 277 | 1 | pfleura2 | END IF |
| 278 | 1 | pfleura2 | ELSE IF( CNAME .AND. C2.EQ.'UN' ) THEN |
| 279 | 1 | pfleura2 | IF( C3( 1: 1 ).EQ.'G' ) THEN |
| 280 | 1 | pfleura2 | IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. |
| 281 | 1 | pfleura2 | $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) |
| 282 | 1 | pfleura2 | $ THEN |
| 283 | 1 | pfleura2 | NB = 32 |
| 284 | 1 | pfleura2 | END IF |
| 285 | 1 | pfleura2 | ELSE IF( C3( 1: 1 ).EQ.'M' ) THEN |
| 286 | 1 | pfleura2 | IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. |
| 287 | 1 | pfleura2 | $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) |
| 288 | 1 | pfleura2 | $ THEN |
| 289 | 1 | pfleura2 | NB = 32 |
| 290 | 1 | pfleura2 | END IF |
| 291 | 1 | pfleura2 | END IF |
| 292 | 1 | pfleura2 | ELSE IF( C2.EQ.'GB' ) THEN |
| 293 | 1 | pfleura2 | IF( C3.EQ.'TRF' ) THEN |
| 294 | 1 | pfleura2 | IF( SNAME ) THEN |
| 295 | 1 | pfleura2 | IF( N4.LE.64 ) THEN |
| 296 | 1 | pfleura2 | NB = 1 |
| 297 | 1 | pfleura2 | ELSE |
| 298 | 1 | pfleura2 | NB = 32 |
| 299 | 1 | pfleura2 | END IF |
| 300 | 1 | pfleura2 | ELSE |
| 301 | 1 | pfleura2 | IF( N4.LE.64 ) THEN |
| 302 | 1 | pfleura2 | NB = 1 |
| 303 | 1 | pfleura2 | ELSE |
| 304 | 1 | pfleura2 | NB = 32 |
| 305 | 1 | pfleura2 | END IF |
| 306 | 1 | pfleura2 | END IF |
| 307 | 1 | pfleura2 | END IF |
| 308 | 1 | pfleura2 | ELSE IF( C2.EQ.'PB' ) THEN |
| 309 | 1 | pfleura2 | IF( C3.EQ.'TRF' ) THEN |
| 310 | 1 | pfleura2 | IF( SNAME ) THEN |
| 311 | 1 | pfleura2 | IF( N2.LE.64 ) THEN |
| 312 | 1 | pfleura2 | NB = 1 |
| 313 | 1 | pfleura2 | ELSE |
| 314 | 1 | pfleura2 | NB = 32 |
| 315 | 1 | pfleura2 | END IF |
| 316 | 1 | pfleura2 | ELSE |
| 317 | 1 | pfleura2 | IF( N2.LE.64 ) THEN |
| 318 | 1 | pfleura2 | NB = 1 |
| 319 | 1 | pfleura2 | ELSE |
| 320 | 1 | pfleura2 | NB = 32 |
| 321 | 1 | pfleura2 | END IF |
| 322 | 1 | pfleura2 | END IF |
| 323 | 1 | pfleura2 | END IF |
| 324 | 1 | pfleura2 | ELSE IF( C2.EQ.'TR' ) THEN |
| 325 | 1 | pfleura2 | IF( C3.EQ.'TRI' ) THEN |
| 326 | 1 | pfleura2 | IF( SNAME ) THEN |
| 327 | 1 | pfleura2 | NB = 64 |
| 328 | 1 | pfleura2 | ELSE |
| 329 | 1 | pfleura2 | NB = 64 |
| 330 | 1 | pfleura2 | END IF |
| 331 | 1 | pfleura2 | END IF |
| 332 | 1 | pfleura2 | ELSE IF( C2.EQ.'LA' ) THEN |
| 333 | 1 | pfleura2 | IF( C3.EQ.'UUM' ) THEN |
| 334 | 1 | pfleura2 | IF( SNAME ) THEN |
| 335 | 1 | pfleura2 | NB = 64 |
| 336 | 1 | pfleura2 | ELSE |
| 337 | 1 | pfleura2 | NB = 64 |
| 338 | 1 | pfleura2 | END IF |
| 339 | 1 | pfleura2 | END IF |
| 340 | 1 | pfleura2 | ELSE IF( SNAME .AND. C2.EQ.'ST' ) THEN |
| 341 | 1 | pfleura2 | IF( C3.EQ.'EBZ' ) THEN |
| 342 | 1 | pfleura2 | NB = 1 |
| 343 | 1 | pfleura2 | END IF |
| 344 | 1 | pfleura2 | END IF |
| 345 | 1 | pfleura2 | ILAENV = NB |
| 346 | 1 | pfleura2 | RETURN |
| 347 | 1 | pfleura2 | * |
| 348 | 1 | pfleura2 | 60 CONTINUE |
| 349 | 1 | pfleura2 | * |
| 350 | 1 | pfleura2 | * ISPEC = 2: minimum block size |
| 351 | 1 | pfleura2 | * |
| 352 | 1 | pfleura2 | NBMIN = 2 |
| 353 | 1 | pfleura2 | IF( C2.EQ.'GE' ) THEN |
| 354 | 1 | pfleura2 | IF( C3.EQ.'QRF' .OR. C3.EQ.'RQF' .OR. C3.EQ.'LQF' .OR. C3.EQ. |
| 355 | 1 | pfleura2 | $ 'QLF' ) THEN |
| 356 | 1 | pfleura2 | IF( SNAME ) THEN |
| 357 | 1 | pfleura2 | NBMIN = 2 |
| 358 | 1 | pfleura2 | ELSE |
| 359 | 1 | pfleura2 | NBMIN = 2 |
| 360 | 1 | pfleura2 | END IF |
| 361 | 1 | pfleura2 | ELSE IF( C3.EQ.'HRD' ) THEN |
| 362 | 1 | pfleura2 | IF( SNAME ) THEN |
| 363 | 1 | pfleura2 | NBMIN = 2 |
| 364 | 1 | pfleura2 | ELSE |
| 365 | 1 | pfleura2 | NBMIN = 2 |
| 366 | 1 | pfleura2 | END IF |
| 367 | 1 | pfleura2 | ELSE IF( C3.EQ.'BRD' ) THEN |
| 368 | 1 | pfleura2 | IF( SNAME ) THEN |
| 369 | 1 | pfleura2 | NBMIN = 2 |
| 370 | 1 | pfleura2 | ELSE |
| 371 | 1 | pfleura2 | NBMIN = 2 |
| 372 | 1 | pfleura2 | END IF |
| 373 | 1 | pfleura2 | ELSE IF( C3.EQ.'TRI' ) THEN |
| 374 | 1 | pfleura2 | IF( SNAME ) THEN |
| 375 | 1 | pfleura2 | NBMIN = 2 |
| 376 | 1 | pfleura2 | ELSE |
| 377 | 1 | pfleura2 | NBMIN = 2 |
| 378 | 1 | pfleura2 | END IF |
| 379 | 1 | pfleura2 | END IF |
| 380 | 1 | pfleura2 | ELSE IF( C2.EQ.'SY' ) THEN |
| 381 | 1 | pfleura2 | IF( C3.EQ.'TRF' ) THEN |
| 382 | 1 | pfleura2 | IF( SNAME ) THEN |
| 383 | 1 | pfleura2 | NBMIN = 8 |
| 384 | 1 | pfleura2 | ELSE |
| 385 | 1 | pfleura2 | NBMIN = 8 |
| 386 | 1 | pfleura2 | END IF |
| 387 | 1 | pfleura2 | ELSE IF( SNAME .AND. C3.EQ.'TRD' ) THEN |
| 388 | 1 | pfleura2 | NBMIN = 2 |
| 389 | 1 | pfleura2 | END IF |
| 390 | 1 | pfleura2 | ELSE IF( CNAME .AND. C2.EQ.'HE' ) THEN |
| 391 | 1 | pfleura2 | IF( C3.EQ.'TRD' ) THEN |
| 392 | 1 | pfleura2 | NBMIN = 2 |
| 393 | 1 | pfleura2 | END IF |
| 394 | 1 | pfleura2 | ELSE IF( SNAME .AND. C2.EQ.'OR' ) THEN |
| 395 | 1 | pfleura2 | IF( C3( 1: 1 ).EQ.'G' ) THEN |
| 396 | 1 | pfleura2 | IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. |
| 397 | 1 | pfleura2 | $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) |
| 398 | 1 | pfleura2 | $ THEN |
| 399 | 1 | pfleura2 | NBMIN = 2 |
| 400 | 1 | pfleura2 | END IF |
| 401 | 1 | pfleura2 | ELSE IF( C3( 1: 1 ).EQ.'M' ) THEN |
| 402 | 1 | pfleura2 | IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. |
| 403 | 1 | pfleura2 | $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) |
| 404 | 1 | pfleura2 | $ THEN |
| 405 | 1 | pfleura2 | NBMIN = 2 |
| 406 | 1 | pfleura2 | END IF |
| 407 | 1 | pfleura2 | END IF |
| 408 | 1 | pfleura2 | ELSE IF( CNAME .AND. C2.EQ.'UN' ) THEN |
| 409 | 1 | pfleura2 | IF( C3( 1: 1 ).EQ.'G' ) THEN |
| 410 | 1 | pfleura2 | IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. |
| 411 | 1 | pfleura2 | $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) |
| 412 | 1 | pfleura2 | $ THEN |
| 413 | 1 | pfleura2 | NBMIN = 2 |
| 414 | 1 | pfleura2 | END IF |
| 415 | 1 | pfleura2 | ELSE IF( C3( 1: 1 ).EQ.'M' ) THEN |
| 416 | 1 | pfleura2 | IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. |
| 417 | 1 | pfleura2 | $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) |
| 418 | 1 | pfleura2 | $ THEN |
| 419 | 1 | pfleura2 | NBMIN = 2 |
| 420 | 1 | pfleura2 | END IF |
| 421 | 1 | pfleura2 | END IF |
| 422 | 1 | pfleura2 | END IF |
| 423 | 1 | pfleura2 | ILAENV = NBMIN |
| 424 | 1 | pfleura2 | RETURN |
| 425 | 1 | pfleura2 | * |
| 426 | 1 | pfleura2 | 70 CONTINUE |
| 427 | 1 | pfleura2 | * |
| 428 | 1 | pfleura2 | * ISPEC = 3: crossover point |
| 429 | 1 | pfleura2 | * |
| 430 | 1 | pfleura2 | NX = 0 |
| 431 | 1 | pfleura2 | IF( C2.EQ.'GE' ) THEN |
| 432 | 1 | pfleura2 | IF( C3.EQ.'QRF' .OR. C3.EQ.'RQF' .OR. C3.EQ.'LQF' .OR. C3.EQ. |
| 433 | 1 | pfleura2 | $ 'QLF' ) THEN |
| 434 | 1 | pfleura2 | IF( SNAME ) THEN |
| 435 | 1 | pfleura2 | NX = 128 |
| 436 | 1 | pfleura2 | ELSE |
| 437 | 1 | pfleura2 | NX = 128 |
| 438 | 1 | pfleura2 | END IF |
| 439 | 1 | pfleura2 | ELSE IF( C3.EQ.'HRD' ) THEN |
| 440 | 1 | pfleura2 | IF( SNAME ) THEN |
| 441 | 1 | pfleura2 | NX = 128 |
| 442 | 1 | pfleura2 | ELSE |
| 443 | 1 | pfleura2 | NX = 128 |
| 444 | 1 | pfleura2 | END IF |
| 445 | 1 | pfleura2 | ELSE IF( C3.EQ.'BRD' ) THEN |
| 446 | 1 | pfleura2 | IF( SNAME ) THEN |
| 447 | 1 | pfleura2 | NX = 128 |
| 448 | 1 | pfleura2 | ELSE |
| 449 | 1 | pfleura2 | NX = 128 |
| 450 | 1 | pfleura2 | END IF |
| 451 | 1 | pfleura2 | END IF |
| 452 | 1 | pfleura2 | ELSE IF( C2.EQ.'SY' ) THEN |
| 453 | 1 | pfleura2 | IF( SNAME .AND. C3.EQ.'TRD' ) THEN |
| 454 | 1 | pfleura2 | NX = 32 |
| 455 | 1 | pfleura2 | END IF |
| 456 | 1 | pfleura2 | ELSE IF( CNAME .AND. C2.EQ.'HE' ) THEN |
| 457 | 1 | pfleura2 | IF( C3.EQ.'TRD' ) THEN |
| 458 | 1 | pfleura2 | NX = 32 |
| 459 | 1 | pfleura2 | END IF |
| 460 | 1 | pfleura2 | ELSE IF( SNAME .AND. C2.EQ.'OR' ) THEN |
| 461 | 1 | pfleura2 | IF( C3( 1: 1 ).EQ.'G' ) THEN |
| 462 | 1 | pfleura2 | IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. |
| 463 | 1 | pfleura2 | $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) |
| 464 | 1 | pfleura2 | $ THEN |
| 465 | 1 | pfleura2 | NX = 128 |
| 466 | 1 | pfleura2 | END IF |
| 467 | 1 | pfleura2 | END IF |
| 468 | 1 | pfleura2 | ELSE IF( CNAME .AND. C2.EQ.'UN' ) THEN |
| 469 | 1 | pfleura2 | IF( C3( 1: 1 ).EQ.'G' ) THEN |
| 470 | 1 | pfleura2 | IF( C4.EQ.'QR' .OR. C4.EQ.'RQ' .OR. C4.EQ.'LQ' .OR. C4.EQ. |
| 471 | 1 | pfleura2 | $ 'QL' .OR. C4.EQ.'HR' .OR. C4.EQ.'TR' .OR. C4.EQ.'BR' ) |
| 472 | 1 | pfleura2 | $ THEN |
| 473 | 1 | pfleura2 | NX = 128 |
| 474 | 1 | pfleura2 | END IF |
| 475 | 1 | pfleura2 | END IF |
| 476 | 1 | pfleura2 | END IF |
| 477 | 1 | pfleura2 | ILAENV = NX |
| 478 | 1 | pfleura2 | RETURN |
| 479 | 1 | pfleura2 | * |
| 480 | 1 | pfleura2 | 80 CONTINUE |
| 481 | 1 | pfleura2 | * |
| 482 | 1 | pfleura2 | * ISPEC = 4: number of shifts (used by xHSEQR) |
| 483 | 1 | pfleura2 | * |
| 484 | 1 | pfleura2 | ILAENV = 6 |
| 485 | 1 | pfleura2 | RETURN |
| 486 | 1 | pfleura2 | * |
| 487 | 1 | pfleura2 | 90 CONTINUE |
| 488 | 1 | pfleura2 | * |
| 489 | 1 | pfleura2 | * ISPEC = 5: minimum column dimension (not used) |
| 490 | 1 | pfleura2 | * |
| 491 | 1 | pfleura2 | ILAENV = 2 |
| 492 | 1 | pfleura2 | RETURN |
| 493 | 1 | pfleura2 | * |
| 494 | 1 | pfleura2 | 100 CONTINUE |
| 495 | 1 | pfleura2 | * |
| 496 | 1 | pfleura2 | * ISPEC = 6: crossover point for SVD (used by xGELSS and xGESVD) |
| 497 | 1 | pfleura2 | * |
| 498 | 1 | pfleura2 | ILAENV = INT( REAL( MIN( N1, N2 ) )*1.6E0 ) |
| 499 | 1 | pfleura2 | RETURN |
| 500 | 1 | pfleura2 | * |
| 501 | 1 | pfleura2 | 110 CONTINUE |
| 502 | 1 | pfleura2 | * |
| 503 | 1 | pfleura2 | * ISPEC = 7: number of processors (not used) |
| 504 | 1 | pfleura2 | * |
| 505 | 1 | pfleura2 | ILAENV = 1 |
| 506 | 1 | pfleura2 | RETURN |
| 507 | 1 | pfleura2 | * |
| 508 | 1 | pfleura2 | 120 CONTINUE |
| 509 | 1 | pfleura2 | * |
| 510 | 1 | pfleura2 | * ISPEC = 8: crossover point for multishift (used by xHSEQR) |
| 511 | 1 | pfleura2 | * |
| 512 | 1 | pfleura2 | ILAENV = 50 |
| 513 | 1 | pfleura2 | RETURN |
| 514 | 1 | pfleura2 | * |
| 515 | 1 | pfleura2 | 130 CONTINUE |
| 516 | 1 | pfleura2 | * |
| 517 | 1 | pfleura2 | * ISPEC = 9: maximum size of the subproblems at the bottom of the |
| 518 | 1 | pfleura2 | * computation tree in the divide-and-conquer algorithm |
| 519 | 1 | pfleura2 | * (used by xGELSD and xGESDD) |
| 520 | 1 | pfleura2 | * |
| 521 | 1 | pfleura2 | ILAENV = 25 |
| 522 | 1 | pfleura2 | RETURN |
| 523 | 1 | pfleura2 | * |
| 524 | 1 | pfleura2 | 140 CONTINUE |
| 525 | 1 | pfleura2 | * |
| 526 | 1 | pfleura2 | * ISPEC = 10: ieee NaN arithmetic can be trusted not to trap |
| 527 | 1 | pfleura2 | * |
| 528 | 1 | pfleura2 | * ILAENV = 0 |
| 529 | 1 | pfleura2 | ILAENV = 1 |
| 530 | 1 | pfleura2 | IF( ILAENV.EQ.1 ) THEN |
| 531 | 1 | pfleura2 | ILAENV = IEEECK( 1, 0.0, 1.0 ) |
| 532 | 1 | pfleura2 | END IF |
| 533 | 1 | pfleura2 | RETURN |
| 534 | 1 | pfleura2 | * |
| 535 | 1 | pfleura2 | 150 CONTINUE |
| 536 | 1 | pfleura2 | * |
| 537 | 1 | pfleura2 | * ISPEC = 11: infinity arithmetic can be trusted not to trap |
| 538 | 1 | pfleura2 | * |
| 539 | 1 | pfleura2 | * ILAENV = 0 |
| 540 | 1 | pfleura2 | ILAENV = 1 |
| 541 | 1 | pfleura2 | IF( ILAENV.EQ.1 ) THEN |
| 542 | 1 | pfleura2 | ILAENV = IEEECK( 0, 0.0, 1.0 ) |
| 543 | 1 | pfleura2 | END IF |
| 544 | 1 | pfleura2 | RETURN |
| 545 | 1 | pfleura2 | * |
| 546 | 1 | pfleura2 | 160 CONTINUE |
| 547 | 1 | pfleura2 | * |
| 548 | 1 | pfleura2 | * 12 <= ISPEC <= 16: xHSEQR or one of its subroutines. |
| 549 | 1 | pfleura2 | * |
| 550 | 1 | pfleura2 | ILAENV = IPARMQ( ISPEC, NAME, OPTS, N1, N2, N3, N4 ) |
| 551 | 1 | pfleura2 | RETURN |
| 552 | 1 | pfleura2 | * |
| 553 | 1 | pfleura2 | * End of ILAENV |
| 554 | 1 | pfleura2 | * |
| 555 | 1 | pfleura2 | END |