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643 lines
19 KiB
C
643 lines
19 KiB
C
#include "clapack.h"
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#include "string.h"
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/* Table of constant values */
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static integer c__0 = 0;
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static real c_b163 = 0.f;
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static real c_b164 = 1.f;
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static integer c__1 = 1;
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integer ilaenv_(integer *ispec, char *name__, char *opts, integer *n1,
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integer *n2, integer *n3, integer *n4)
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{
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/* System generated locals */
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integer ret_val;
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/* Builtin functions */
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/* Subroutine */ int s_copy(char *, char *, ftnlen, ftnlen);
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integer s_cmp(char *, char *, ftnlen, ftnlen);
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/* Local variables */
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static integer i__;
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static char c1[1], c2[2], c3[3], c4[2];
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static integer ic, nb, iz, nx;
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static logical cname;
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static integer nbmin;
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static logical sname;
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extern integer ieeeck_(integer *, real *, real *);
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static char subnam[6];
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extern integer iparmq_(integer *, char *, char *, integer *, integer *,
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integer *, integer *);
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ftnlen name_len, opts_len;
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name_len = strlen (name__);
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opts_len = strlen (opts);
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/* -- LAPACK auxiliary routine (version 3.1.1) -- */
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/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
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/* January 2007 */
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/* .. Scalar Arguments .. */
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/* .. */
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/* Purpose */
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/* ======= */
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/* ILAENV is called from the LAPACK routines to choose problem-dependent */
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/* parameters for the local environment. See ISPEC for a description of */
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/* the parameters. */
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/* ILAENV returns an INTEGER */
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/* if ILAENV >= 0: ILAENV returns the value of the parameter specified by ISPEC */
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/* if ILAENV < 0: if ILAENV = -k, the k-th argument had an illegal value. */
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/* This version provides a set of parameters which should give good, */
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/* but not optimal, performance on many of the currently available */
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/* computers. Users are encouraged to modify this subroutine to set */
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/* the tuning parameters for their particular machine using the option */
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/* and problem size information in the arguments. */
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/* This routine will not function correctly if it is converted to all */
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/* lower case. Converting it to all upper case is allowed. */
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/* Arguments */
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/* ========= */
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/* ISPEC (input) INTEGER */
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/* Specifies the parameter to be returned as the value of */
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/* ILAENV. */
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/* = 1: the optimal blocksize; if this value is 1, an unblocked */
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/* algorithm will give the best performance. */
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/* = 2: the minimum block size for which the block routine */
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/* should be used; if the usable block size is less than */
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/* this value, an unblocked routine should be used. */
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/* = 3: the crossover point (in a block routine, for N less */
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/* than this value, an unblocked routine should be used) */
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/* = 4: the number of shifts, used in the nonsymmetric */
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/* eigenvalue routines (DEPRECATED) */
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/* = 5: the minimum column dimension for blocking to be used; */
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/* rectangular blocks must have dimension at least k by m, */
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/* where k is given by ILAENV(2,...) and m by ILAENV(5,...) */
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/* = 6: the crossover point for the SVD (when reducing an m by n */
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/* matrix to bidiagonal form, if max(m,n)/min(m,n) exceeds */
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/* this value, a QR factorization is used first to reduce */
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/* the matrix to a triangular form.) */
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/* = 7: the number of processors */
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/* = 8: the crossover point for the multishift QR method */
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/* for nonsymmetric eigenvalue problems (DEPRECATED) */
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/* = 9: maximum size of the subproblems at the bottom of the */
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/* computation tree in the divide-and-conquer algorithm */
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/* (used by xGELSD and xGESDD) */
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/* =10: ieee NaN arithmetic can be trusted not to trap */
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/* =11: infinity arithmetic can be trusted not to trap */
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/* 12 <= ISPEC <= 16: */
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/* xHSEQR or one of its subroutines, */
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/* see IPARMQ for detailed explanation */
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/* NAME (input) CHARACTER*(*) */
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/* The name of the calling subroutine, in either upper case or */
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/* lower case. */
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/* OPTS (input) CHARACTER*(*) */
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/* The character options to the subroutine NAME, concatenated */
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/* into a single character string. For example, UPLO = 'U', */
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/* TRANS = 'T', and DIAG = 'N' for a triangular routine would */
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/* be specified as OPTS = 'UTN'. */
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/* N1 (input) INTEGER */
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/* N2 (input) INTEGER */
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/* N3 (input) INTEGER */
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/* N4 (input) INTEGER */
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/* Problem dimensions for the subroutine NAME; these may not all */
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/* be required. */
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/* Further Details */
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/* =============== */
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/* The following conventions have been used when calling ILAENV from the */
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/* LAPACK routines: */
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/* 1) OPTS is a concatenation of all of the character options to */
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/* subroutine NAME, in the same order that they appear in the */
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/* argument list for NAME, even if they are not used in determining */
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/* the value of the parameter specified by ISPEC. */
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/* 2) The problem dimensions N1, N2, N3, N4 are specified in the order */
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/* that they appear in the argument list for NAME. N1 is used */
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/* first, N2 second, and so on, and unused problem dimensions are */
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/* passed a value of -1. */
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/* 3) The parameter value returned by ILAENV is checked for validity in */
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/* the calling subroutine. For example, ILAENV is used to retrieve */
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/* the optimal blocksize for STRTRI as follows: */
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/* NB = ILAENV( 1, 'STRTRI', UPLO // DIAG, N, -1, -1, -1 ) */
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/* IF( NB.LE.1 ) NB = MAX( 1, N ) */
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/* ===================================================================== */
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/* .. Local Scalars .. */
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/* .. */
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/* .. Intrinsic Functions .. */
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/* .. */
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/* .. External Functions .. */
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/* .. */
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/* .. Executable Statements .. */
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switch (*ispec) {
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case 1: goto L10;
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case 2: goto L10;
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case 3: goto L10;
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case 4: goto L80;
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case 5: goto L90;
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case 6: goto L100;
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case 7: goto L110;
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case 8: goto L120;
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case 9: goto L130;
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case 10: goto L140;
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case 11: goto L150;
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case 12: goto L160;
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case 13: goto L160;
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case 14: goto L160;
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case 15: goto L160;
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case 16: goto L160;
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}
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/* Invalid value for ISPEC */
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ret_val = -1;
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return ret_val;
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L10:
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/* Convert NAME to upper case if the first character is lower case. */
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ret_val = 1;
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s_copy(subnam, name__, (ftnlen)6, name_len);
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ic = *(unsigned char *)subnam;
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iz = 'Z';
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if (iz == 90 || iz == 122) {
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/* ASCII character set */
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if (ic >= 97 && ic <= 122) {
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*(unsigned char *)subnam = (char) (ic - 32);
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for (i__ = 2; i__ <= 6; ++i__) {
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ic = *(unsigned char *)&subnam[i__ - 1];
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if (ic >= 97 && ic <= 122) {
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*(unsigned char *)&subnam[i__ - 1] = (char) (ic - 32);
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}
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/* L20: */
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}
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}
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} else if (iz == 233 || iz == 169) {
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/* EBCDIC character set */
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if (ic >= 129 && ic <= 137 || ic >= 145 && ic <= 153 || ic >= 162 &&
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ic <= 169) {
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*(unsigned char *)subnam = (char) (ic + 64);
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for (i__ = 2; i__ <= 6; ++i__) {
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ic = *(unsigned char *)&subnam[i__ - 1];
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if (ic >= 129 && ic <= 137 || ic >= 145 && ic <= 153 || ic >=
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162 && ic <= 169) {
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*(unsigned char *)&subnam[i__ - 1] = (char) (ic + 64);
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}
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/* L30: */
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}
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}
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} else if (iz == 218 || iz == 250) {
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/* Prime machines: ASCII+128 */
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if (ic >= 225 && ic <= 250) {
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*(unsigned char *)subnam = (char) (ic - 32);
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for (i__ = 2; i__ <= 6; ++i__) {
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ic = *(unsigned char *)&subnam[i__ - 1];
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if (ic >= 225 && ic <= 250) {
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*(unsigned char *)&subnam[i__ - 1] = (char) (ic - 32);
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}
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/* L40: */
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}
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}
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}
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*(unsigned char *)c1 = *(unsigned char *)subnam;
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sname = *(unsigned char *)c1 == 'S' || *(unsigned char *)c1 == 'D';
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cname = *(unsigned char *)c1 == 'C' || *(unsigned char *)c1 == 'Z';
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if (! (cname || sname)) {
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return ret_val;
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}
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s_copy(c2, subnam + 1, (ftnlen)2, (ftnlen)2);
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s_copy(c3, subnam + 3, (ftnlen)3, (ftnlen)3);
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s_copy(c4, c3 + 1, (ftnlen)2, (ftnlen)2);
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switch (*ispec) {
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case 1: goto L50;
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case 2: goto L60;
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case 3: goto L70;
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}
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L50:
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/* ISPEC = 1: block size */
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/* In these examples, separate code is provided for setting NB for */
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/* real and complex. We assume that NB will take the same value in */
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/* single or double precision. */
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nb = 1;
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if (s_cmp(c2, "GE", (ftnlen)2, (ftnlen)2) == 0) {
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if (s_cmp(c3, "TRF", (ftnlen)3, (ftnlen)3) == 0) {
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if (sname) {
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nb = 64;
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} else {
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nb = 64;
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}
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} else if (s_cmp(c3, "QRF", (ftnlen)3, (ftnlen)3) == 0 || s_cmp(c3,
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"RQF", (ftnlen)3, (ftnlen)3) == 0 || s_cmp(c3, "LQF", (ftnlen)
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3, (ftnlen)3) == 0 || s_cmp(c3, "QLF", (ftnlen)3, (ftnlen)3)
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== 0) {
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if (sname) {
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nb = 32;
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} else {
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nb = 32;
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}
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} else if (s_cmp(c3, "HRD", (ftnlen)3, (ftnlen)3) == 0) {
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if (sname) {
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nb = 32;
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} else {
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nb = 32;
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}
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} else if (s_cmp(c3, "BRD", (ftnlen)3, (ftnlen)3) == 0) {
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if (sname) {
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nb = 32;
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} else {
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nb = 32;
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}
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} else if (s_cmp(c3, "TRI", (ftnlen)3, (ftnlen)3) == 0) {
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if (sname) {
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nb = 64;
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} else {
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nb = 64;
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}
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}
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} else if (s_cmp(c2, "PO", (ftnlen)2, (ftnlen)2) == 0) {
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if (s_cmp(c3, "TRF", (ftnlen)3, (ftnlen)3) == 0) {
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if (sname) {
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nb = 64;
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} else {
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nb = 64;
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}
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}
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} else if (s_cmp(c2, "SY", (ftnlen)2, (ftnlen)2) == 0) {
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if (s_cmp(c3, "TRF", (ftnlen)3, (ftnlen)3) == 0) {
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if (sname) {
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nb = 64;
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} else {
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nb = 64;
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}
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} else if (sname && s_cmp(c3, "TRD", (ftnlen)3, (ftnlen)3) == 0) {
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nb = 32;
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} else if (sname && s_cmp(c3, "GST", (ftnlen)3, (ftnlen)3) == 0) {
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nb = 64;
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}
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} else if (cname && s_cmp(c2, "HE", (ftnlen)2, (ftnlen)2) == 0) {
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if (s_cmp(c3, "TRF", (ftnlen)3, (ftnlen)3) == 0) {
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nb = 64;
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} else if (s_cmp(c3, "TRD", (ftnlen)3, (ftnlen)3) == 0) {
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nb = 32;
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} else if (s_cmp(c3, "GST", (ftnlen)3, (ftnlen)3) == 0) {
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nb = 64;
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}
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} else if (sname && s_cmp(c2, "OR", (ftnlen)2, (ftnlen)2) == 0) {
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if (*(unsigned char *)c3 == 'G') {
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if (s_cmp(c4, "QR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "RQ",
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(ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "LQ", (ftnlen)2, (
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ftnlen)2) == 0 || s_cmp(c4, "QL", (ftnlen)2, (ftnlen)2) ==
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0 || s_cmp(c4, "HR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(
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c4, "TR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "BR", (
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ftnlen)2, (ftnlen)2) == 0) {
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nb = 32;
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}
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} else if (*(unsigned char *)c3 == 'M') {
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if (s_cmp(c4, "QR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "RQ",
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(ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "LQ", (ftnlen)2, (
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ftnlen)2) == 0 || s_cmp(c4, "QL", (ftnlen)2, (ftnlen)2) ==
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0 || s_cmp(c4, "HR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(
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c4, "TR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "BR", (
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ftnlen)2, (ftnlen)2) == 0) {
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nb = 32;
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}
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}
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} else if (cname && s_cmp(c2, "UN", (ftnlen)2, (ftnlen)2) == 0) {
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if (*(unsigned char *)c3 == 'G') {
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if (s_cmp(c4, "QR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "RQ",
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(ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "LQ", (ftnlen)2, (
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ftnlen)2) == 0 || s_cmp(c4, "QL", (ftnlen)2, (ftnlen)2) ==
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0 || s_cmp(c4, "HR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(
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c4, "TR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "BR", (
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ftnlen)2, (ftnlen)2) == 0) {
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nb = 32;
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}
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} else if (*(unsigned char *)c3 == 'M') {
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if (s_cmp(c4, "QR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "RQ",
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(ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "LQ", (ftnlen)2, (
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ftnlen)2) == 0 || s_cmp(c4, "QL", (ftnlen)2, (ftnlen)2) ==
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0 || s_cmp(c4, "HR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(
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c4, "TR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "BR", (
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ftnlen)2, (ftnlen)2) == 0) {
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nb = 32;
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}
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}
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} else if (s_cmp(c2, "GB", (ftnlen)2, (ftnlen)2) == 0) {
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if (s_cmp(c3, "TRF", (ftnlen)3, (ftnlen)3) == 0) {
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if (sname) {
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if (*n4 <= 64) {
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nb = 1;
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} else {
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nb = 32;
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}
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} else {
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if (*n4 <= 64) {
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nb = 1;
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} else {
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nb = 32;
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}
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}
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}
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} else if (s_cmp(c2, "PB", (ftnlen)2, (ftnlen)2) == 0) {
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if (s_cmp(c3, "TRF", (ftnlen)3, (ftnlen)3) == 0) {
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if (sname) {
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if (*n2 <= 64) {
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nb = 1;
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} else {
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nb = 32;
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}
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} else {
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if (*n2 <= 64) {
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nb = 1;
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} else {
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nb = 32;
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}
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}
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}
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} else if (s_cmp(c2, "TR", (ftnlen)2, (ftnlen)2) == 0) {
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if (s_cmp(c3, "TRI", (ftnlen)3, (ftnlen)3) == 0) {
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if (sname) {
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nb = 64;
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} else {
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nb = 64;
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}
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}
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} else if (s_cmp(c2, "LA", (ftnlen)2, (ftnlen)2) == 0) {
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if (s_cmp(c3, "UUM", (ftnlen)3, (ftnlen)3) == 0) {
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if (sname) {
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nb = 64;
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} else {
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nb = 64;
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}
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}
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} else if (sname && s_cmp(c2, "ST", (ftnlen)2, (ftnlen)2) == 0) {
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if (s_cmp(c3, "EBZ", (ftnlen)3, (ftnlen)3) == 0) {
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nb = 1;
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}
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}
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ret_val = nb;
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return ret_val;
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L60:
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/* ISPEC = 2: minimum block size */
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nbmin = 2;
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if (s_cmp(c2, "GE", (ftnlen)2, (ftnlen)2) == 0) {
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if (s_cmp(c3, "QRF", (ftnlen)3, (ftnlen)3) == 0 || s_cmp(c3, "RQF", (
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ftnlen)3, (ftnlen)3) == 0 || s_cmp(c3, "LQF", (ftnlen)3, (
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ftnlen)3) == 0 || s_cmp(c3, "QLF", (ftnlen)3, (ftnlen)3) == 0)
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{
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if (sname) {
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nbmin = 2;
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} else {
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nbmin = 2;
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}
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} else if (s_cmp(c3, "HRD", (ftnlen)3, (ftnlen)3) == 0) {
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if (sname) {
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nbmin = 2;
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} else {
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nbmin = 2;
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}
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} else if (s_cmp(c3, "BRD", (ftnlen)3, (ftnlen)3) == 0) {
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if (sname) {
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nbmin = 2;
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} else {
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nbmin = 2;
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}
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} else if (s_cmp(c3, "TRI", (ftnlen)3, (ftnlen)3) == 0) {
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if (sname) {
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nbmin = 2;
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} else {
|
|
nbmin = 2;
|
|
}
|
|
}
|
|
} else if (s_cmp(c2, "SY", (ftnlen)2, (ftnlen)2) == 0) {
|
|
if (s_cmp(c3, "TRF", (ftnlen)3, (ftnlen)3) == 0) {
|
|
if (sname) {
|
|
nbmin = 8;
|
|
} else {
|
|
nbmin = 8;
|
|
}
|
|
} else if (sname && s_cmp(c3, "TRD", (ftnlen)3, (ftnlen)3) == 0) {
|
|
nbmin = 2;
|
|
}
|
|
} else if (cname && s_cmp(c2, "HE", (ftnlen)2, (ftnlen)2) == 0) {
|
|
if (s_cmp(c3, "TRD", (ftnlen)3, (ftnlen)3) == 0) {
|
|
nbmin = 2;
|
|
}
|
|
} else if (sname && s_cmp(c2, "OR", (ftnlen)2, (ftnlen)2) == 0) {
|
|
if (*(unsigned char *)c3 == 'G') {
|
|
if (s_cmp(c4, "QR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "RQ",
|
|
(ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "LQ", (ftnlen)2, (
|
|
ftnlen)2) == 0 || s_cmp(c4, "QL", (ftnlen)2, (ftnlen)2) ==
|
|
0 || s_cmp(c4, "HR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(
|
|
c4, "TR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "BR", (
|
|
ftnlen)2, (ftnlen)2) == 0) {
|
|
nbmin = 2;
|
|
}
|
|
} else if (*(unsigned char *)c3 == 'M') {
|
|
if (s_cmp(c4, "QR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "RQ",
|
|
(ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "LQ", (ftnlen)2, (
|
|
ftnlen)2) == 0 || s_cmp(c4, "QL", (ftnlen)2, (ftnlen)2) ==
|
|
0 || s_cmp(c4, "HR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(
|
|
c4, "TR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "BR", (
|
|
ftnlen)2, (ftnlen)2) == 0) {
|
|
nbmin = 2;
|
|
}
|
|
}
|
|
} else if (cname && s_cmp(c2, "UN", (ftnlen)2, (ftnlen)2) == 0) {
|
|
if (*(unsigned char *)c3 == 'G') {
|
|
if (s_cmp(c4, "QR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "RQ",
|
|
(ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "LQ", (ftnlen)2, (
|
|
ftnlen)2) == 0 || s_cmp(c4, "QL", (ftnlen)2, (ftnlen)2) ==
|
|
0 || s_cmp(c4, "HR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(
|
|
c4, "TR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "BR", (
|
|
ftnlen)2, (ftnlen)2) == 0) {
|
|
nbmin = 2;
|
|
}
|
|
} else if (*(unsigned char *)c3 == 'M') {
|
|
if (s_cmp(c4, "QR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "RQ",
|
|
(ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "LQ", (ftnlen)2, (
|
|
ftnlen)2) == 0 || s_cmp(c4, "QL", (ftnlen)2, (ftnlen)2) ==
|
|
0 || s_cmp(c4, "HR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(
|
|
c4, "TR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "BR", (
|
|
ftnlen)2, (ftnlen)2) == 0) {
|
|
nbmin = 2;
|
|
}
|
|
}
|
|
}
|
|
ret_val = nbmin;
|
|
return ret_val;
|
|
|
|
L70:
|
|
|
|
/* ISPEC = 3: crossover point */
|
|
|
|
nx = 0;
|
|
if (s_cmp(c2, "GE", (ftnlen)2, (ftnlen)2) == 0) {
|
|
if (s_cmp(c3, "QRF", (ftnlen)3, (ftnlen)3) == 0 || s_cmp(c3, "RQF", (
|
|
ftnlen)3, (ftnlen)3) == 0 || s_cmp(c3, "LQF", (ftnlen)3, (
|
|
ftnlen)3) == 0 || s_cmp(c3, "QLF", (ftnlen)3, (ftnlen)3) == 0)
|
|
{
|
|
if (sname) {
|
|
nx = 128;
|
|
} else {
|
|
nx = 128;
|
|
}
|
|
} else if (s_cmp(c3, "HRD", (ftnlen)3, (ftnlen)3) == 0) {
|
|
if (sname) {
|
|
nx = 128;
|
|
} else {
|
|
nx = 128;
|
|
}
|
|
} else if (s_cmp(c3, "BRD", (ftnlen)3, (ftnlen)3) == 0) {
|
|
if (sname) {
|
|
nx = 128;
|
|
} else {
|
|
nx = 128;
|
|
}
|
|
}
|
|
} else if (s_cmp(c2, "SY", (ftnlen)2, (ftnlen)2) == 0) {
|
|
if (sname && s_cmp(c3, "TRD", (ftnlen)3, (ftnlen)3) == 0) {
|
|
nx = 32;
|
|
}
|
|
} else if (cname && s_cmp(c2, "HE", (ftnlen)2, (ftnlen)2) == 0) {
|
|
if (s_cmp(c3, "TRD", (ftnlen)3, (ftnlen)3) == 0) {
|
|
nx = 32;
|
|
}
|
|
} else if (sname && s_cmp(c2, "OR", (ftnlen)2, (ftnlen)2) == 0) {
|
|
if (*(unsigned char *)c3 == 'G') {
|
|
if (s_cmp(c4, "QR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "RQ",
|
|
(ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "LQ", (ftnlen)2, (
|
|
ftnlen)2) == 0 || s_cmp(c4, "QL", (ftnlen)2, (ftnlen)2) ==
|
|
0 || s_cmp(c4, "HR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(
|
|
c4, "TR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "BR", (
|
|
ftnlen)2, (ftnlen)2) == 0) {
|
|
nx = 128;
|
|
}
|
|
}
|
|
} else if (cname && s_cmp(c2, "UN", (ftnlen)2, (ftnlen)2) == 0) {
|
|
if (*(unsigned char *)c3 == 'G') {
|
|
if (s_cmp(c4, "QR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "RQ",
|
|
(ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "LQ", (ftnlen)2, (
|
|
ftnlen)2) == 0 || s_cmp(c4, "QL", (ftnlen)2, (ftnlen)2) ==
|
|
0 || s_cmp(c4, "HR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(
|
|
c4, "TR", (ftnlen)2, (ftnlen)2) == 0 || s_cmp(c4, "BR", (
|
|
ftnlen)2, (ftnlen)2) == 0) {
|
|
nx = 128;
|
|
}
|
|
}
|
|
}
|
|
ret_val = nx;
|
|
return ret_val;
|
|
|
|
L80:
|
|
|
|
/* ISPEC = 4: number of shifts (used by xHSEQR) */
|
|
|
|
ret_val = 6;
|
|
return ret_val;
|
|
|
|
L90:
|
|
|
|
/* ISPEC = 5: minimum column dimension (not used) */
|
|
|
|
ret_val = 2;
|
|
return ret_val;
|
|
|
|
L100:
|
|
|
|
/* ISPEC = 6: crossover point for SVD (used by xGELSS and xGESVD) */
|
|
|
|
ret_val = (integer) ((real) min(*n1,*n2) * 1.6f);
|
|
return ret_val;
|
|
|
|
L110:
|
|
|
|
/* ISPEC = 7: number of processors (not used) */
|
|
|
|
ret_val = 1;
|
|
return ret_val;
|
|
|
|
L120:
|
|
|
|
/* ISPEC = 8: crossover point for multishift (used by xHSEQR) */
|
|
|
|
ret_val = 50;
|
|
return ret_val;
|
|
|
|
L130:
|
|
|
|
/* 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) */
|
|
|
|
ret_val = 25;
|
|
return ret_val;
|
|
|
|
L140:
|
|
|
|
/* ISPEC = 10: ieee NaN arithmetic can be trusted not to trap */
|
|
|
|
/* ILAENV = 0 */
|
|
ret_val = 1;
|
|
if (ret_val == 1) {
|
|
ret_val = ieeeck_(&c__0, &c_b163, &c_b164);
|
|
}
|
|
return ret_val;
|
|
|
|
L150:
|
|
|
|
/* ISPEC = 11: infinity arithmetic can be trusted not to trap */
|
|
|
|
/* ILAENV = 0 */
|
|
ret_val = 1;
|
|
if (ret_val == 1) {
|
|
ret_val = ieeeck_(&c__1, &c_b163, &c_b164);
|
|
}
|
|
return ret_val;
|
|
|
|
L160:
|
|
|
|
/* 12 <= ISPEC <= 16: xHSEQR or one of its subroutines. */
|
|
|
|
ret_val = iparmq_(ispec, name__, opts, n1, n2, n3, n4)
|
|
;
|
|
return ret_val;
|
|
|
|
/* End of ILAENV */
|
|
|
|
} /* ilaenv_ */
|