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|
/* ilaenv.f -- translated by f2c (version 19991025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
integer ilaenv_(ispec, name__, opts, n1, n2, n3, n4, name_len, opts_len)
integer *ispec;
char *name__, *opts;
integer *n1, *n2, *n3, *n4;
ftnlen name_len;
ftnlen opts_len;
{
/* System generated locals */
integer ret_val;
/* Builtin functions */
/* Subroutine */ int s_copy();
integer s_cmp();
/* Local variables */
static integer i__;
static logical cname, sname;
static integer nbmin;
static char c1[1], c2[2], c3[3], c4[2];
static integer ic, nb, iz, nx;
static char subnam[6];
/* -- LAPACK AUXILIARY ROUTINE (PRELIMINARY VERSION) -- */
/* UNIV. OF TENNESSEE, UNIV. OF CALIFORNIA BERKELEY, NAG LTD., */
/* COURANT INSTITUTE, ARGONNE NATIONAL LAB, AND RICE UNIVERSITY */
/* FEBRUARY 20, 1992 */
/* .. SCALAR ARGUMENTS .. */
/* .. */
/* 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 */
/* = 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 AND QZ METHODS */
/* FOR NONSYMMETRIC EIGENVALUE PROBLEMS. */
/* 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 .. */
/* .. */
/* .. INTRINSIC FUNCTIONS .. */
/* .. */
/* .. EXECUTABLE STATEMENTS .. */
switch ((int)*ispec) {
case 1: goto L100;
case 2: goto L100;
case 3: goto L100;
case 4: goto L400;
case 5: goto L500;
case 6: goto L600;
case 7: goto L700;
case 8: goto L800;
}
/* INVALID VALUE FOR ISPEC */
ret_val = -1;
return ret_val;
L100:
/* CONVERT NAME TO UPPER CASE IF THE FIRST CHARACTER IS LOWER CASE. */
ret_val = 1;
s_copy(subnam, name__, (ftnlen)6, name_len);
ic = *(unsigned char *)subnam;
iz = 'Z';
if (iz == 90 || iz == 122) {
/* ASCII CHARACTER SET */
if (ic >= 97 && ic <= 122) {
*(unsigned char *)subnam = (char) (ic - 32);
for (i__ = 2; i__ <= 6; ++i__) {
ic = *(unsigned char *)&subnam[i__ - 1];
if (ic >= 97 && ic <= 122) {
*(unsigned char *)&subnam[i__ - 1] = (char) (ic - 32);
}
/* L10: */
}
}
} else if (iz == 233 || iz == 169) {
/* EBCDIC CHARACTER SET */
if (ic >= 129 && ic <= 137 || ic >= 145 && ic <= 153 || ic >= 162 &&
ic <= 169) {
*(unsigned char *)subnam = (char) (ic + 64);
for (i__ = 2; i__ <= 6; ++i__) {
ic = *(unsigned char *)&subnam[i__ - 1];
if (ic >= 129 && ic <= 137 || ic >= 145 && ic <= 153 || ic >=
162 && ic <= 169) {
*(unsigned char *)&subnam[i__ - 1] = (char) (ic + 64);
}
/* L20: */
}
}
} else if (iz == 218 || iz == 250) {
/* PRIME MACHINES: ASCII+128 */
if (ic >= 225 && ic <= 250) {
*(unsigned char *)subnam = (char) (ic - 32);
for (i__ = 2; i__ <= 6; ++i__) {
ic = *(unsigned char *)&subnam[i__ - 1];
if (ic >= 225 && ic <= 250) {
*(unsigned char *)&subnam[i__ - 1] = (char) (ic - 32);
}
/* L30: */
}
}
}
*(unsigned char *)c1 = *(unsigned char *)subnam;
sname = *(unsigned char *)c1 == 'S' || *(unsigned char *)c1 == 'D';
cname = *(unsigned char *)c1 == 'C' || *(unsigned char *)c1 == 'Z';
if (! (cname || sname)) {
return ret_val;
}
s_copy(c2, subnam + 1, (ftnlen)2, (ftnlen)2);
s_copy(c3, subnam + 3, (ftnlen)3, (ftnlen)3);
s_copy(c4, c3 + 1, (ftnlen)2, (ftnlen)2);
switch ((int)*ispec) {
case 1: goto L110;
case 2: goto L200;
case 3: goto L300;
}
L110:
/* 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 (s_cmp(c2, "GE", (ftnlen)2, (ftnlen)2) == 0) {
if (s_cmp(c3, "TRF", (ftnlen)3, (ftnlen)3) == 0) {
if (sname) {
nb = 64;
} else {
nb = 64;
}
} else 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) {
nb = 32;
} else {
nb = 32;
}
} else if (s_cmp(c3, "HRD", (ftnlen)3, (ftnlen)3) == 0) {
if (sname) {
nb = 32;
} else {
nb = 32;
}
} else if (s_cmp(c3, "BRD", (ftnlen)3, (ftnlen)3) == 0) {
if (sname) {
nb = 32;
} else {
nb = 32;
}
} else if (s_cmp(c3, "TRI", (ftnlen)3, (ftnlen)3) == 0) {
if (sname) {
nb = 64;
} else {
nb = 64;
}
}
} else if (s_cmp(c2, "PO", (ftnlen)2, (ftnlen)2) == 0) {
if (s_cmp(c3, "TRF", (ftnlen)3, (ftnlen)3) == 0) {
if (sname) {
nb = 64;
} else {
nb = 64;
}
}
} else if (s_cmp(c2, "SY", (ftnlen)2, (ftnlen)2) == 0) {
if (s_cmp(c3, "TRF", (ftnlen)3, (ftnlen)3) == 0) {
if (sname) {
nb = 64;
} else {
nb = 64;
}
} else if (sname && s_cmp(c3, "TRD", (ftnlen)3, (ftnlen)3) == 0) {
nb = 1;
} else if (sname && s_cmp(c3, "GST", (ftnlen)3, (ftnlen)3) == 0) {
nb = 64;
}
} else if (cname && s_cmp(c2, "HE", (ftnlen)2, (ftnlen)2) == 0) {
if (s_cmp(c3, "TRF", (ftnlen)3, (ftnlen)3) == 0) {
nb = 64;
} else if (s_cmp(c3, "TRD", (ftnlen)3, (ftnlen)3) == 0) {
nb = 1;
} else if (s_cmp(c3, "GST", (ftnlen)3, (ftnlen)3) == 0) {
nb = 64;
}
} 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) {
nb = 32;
}
} 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) {
nb = 32;
}
}
} 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) {
nb = 32;
}
} 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) {
nb = 32;
}
}
} else if (s_cmp(c2, "GB", (ftnlen)2, (ftnlen)2) == 0) {
if (s_cmp(c3, "TRF", (ftnlen)3, (ftnlen)3) == 0) {
if (sname) {
if (*n4 <= 64) {
nb = 1;
} else {
nb = 32;
}
} else {
if (*n4 <= 64) {
nb = 1;
} else {
nb = 32;
}
}
}
} else if (s_cmp(c2, "PB", (ftnlen)2, (ftnlen)2) == 0) {
if (s_cmp(c3, "TRF", (ftnlen)3, (ftnlen)3) == 0) {
if (sname) {
if (*n2 <= 64) {
nb = 1;
} else {
nb = 32;
}
} else {
if (*n2 <= 64) {
nb = 1;
} else {
nb = 32;
}
}
}
} else if (s_cmp(c2, "TR", (ftnlen)2, (ftnlen)2) == 0) {
if (s_cmp(c3, "TRI", (ftnlen)3, (ftnlen)3) == 0) {
if (sname) {
nb = 64;
} else {
nb = 64;
}
}
} else if (s_cmp(c2, "LA", (ftnlen)2, (ftnlen)2) == 0) {
if (s_cmp(c3, "UUM", (ftnlen)3, (ftnlen)3) == 0) {
if (sname) {
nb = 64;
} else {
nb = 64;
}
}
} else if (sname && s_cmp(c2, "ST", (ftnlen)2, (ftnlen)2) == 0) {
if (s_cmp(c3, "EBZ", (ftnlen)3, (ftnlen)3) == 0) {
nb = 1;
}
}
ret_val = nb;
return ret_val;
L200:
/* ISPEC = 2: MINIMUM BLOCK SIZE */
nbmin = 2;
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) {
nbmin = 2;
} else {
nbmin = 2;
}
} else if (s_cmp(c3, "HRD", (ftnlen)3, (ftnlen)3) == 0) {
if (sname) {
nbmin = 2;
} else {
nbmin = 2;
}
} else if (s_cmp(c3, "BRD", (ftnlen)3, (ftnlen)3) == 0) {
if (sname) {
nbmin = 2;
} else {
nbmin = 2;
}
} else if (s_cmp(c3, "TRI", (ftnlen)3, (ftnlen)3) == 0) {
if (sname) {
nbmin = 2;
} 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 = 2;
} else {
nbmin = 2;
}
} 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;
L300:
/* 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 = 1;
}
} else if (cname && s_cmp(c2, "HE", (ftnlen)2, (ftnlen)2) == 0) {
if (s_cmp(c3, "TRD", (ftnlen)3, (ftnlen)3) == 0) {
nx = 1;
}
} 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;
L400:
/* ISPEC = 4: NUMBER OF SHIFTS (USED BY XHSEQR) */
ret_val = 6;
return ret_val;
L500:
/* ISPEC = 5: MINIMUM COLUMN DIMENSION (NOT USED) */
ret_val = 2;
return ret_val;
L600:
/* ISPEC = 6: CROSSOVER POINT FOR SVD (USED BY XGELSS AND XGESVD) */
ret_val = (integer) ((real) min(*n1,*n2) * (float)1.6);
return ret_val;
L700:
/* ISPEC = 7: NUMBER OF PROCESSORS (NOT USED) */
ret_val = 1;
return ret_val;
L800:
/* ISPEC = 8: CROSSOVER POINT FOR MULTISHIFT (USED BY XHSEQR) */
ret_val = 50;
return ret_val;
/* END OF ILAENV */
} /* ilaenv_ */
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