#include "blaswrap.h"
/*  -- translated by f2c (version 19990503).
   You must link the resulting object file with the libraries:
	-lf2c -lm   (in that order)
*/

#include "f2c.h"

/* Common Block Declarations */

struct {
    integer iparms[100];
} claenv_;

#define claenv_1 claenv_

/* Table of constant values */

static integer c__0 = 0;
static real c_b3 = 0.f;
static real c_b4 = 1.f;
static integer c__1 = 1;

integer ilaenv_(integer *ispec, char *name__, char *opts, integer *n1, 
	integer *n2, integer *n3, integer *n4, ftnlen name_len, ftnlen 
	opts_len)
{
    /* System generated locals */
    integer ret_val;

    /* Local variables */
    extern integer ieeeck_(integer *, real *, real *);


/*  -- LAPACK auxiliary routine (version 3.0) --   
       Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,   
       Courant Institute, Argonne National Lab, and Rice University   
       June 30, 1999   


    Purpose   
    =======   

    ILAENV returns problem-dependent parameters for the local   
    environment.  See ISPEC for a description of the parameters.   

    In this version, the problem-dependent parameters are contained in   
    the integer array IPARMS in the common block CLAENV and the value   
    with index ISPEC is copied to ILAENV.  This version of ILAENV is   
    to be used in conjunction with XLAENV in TESTING and TIMING.   

    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.   
            = 9: maximum size of the subproblems at the bottom of the   
                 computation tree in the divide-and-conquer algorithm   
            =10: ieee NaN arithmetic can be trusted not to trap   
            =11: infinity arithmetic can be trusted not to trap   

            Other specifications (up to 100) can be added later.   

    NAME    (input) CHARACTER*(*)   
            The name of the calling subroutine.   

    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 )   

    ===================================================================== */


    if (*ispec >= 1 && *ispec <= 5) {

/*        Return a value from the common block. */

	ret_val = claenv_1.iparms[*ispec - 1];

    } else if (*ispec == 6) {

/*        Compute SVD crossover point. */

	ret_val = (integer) ((real) min(*n1,*n2) * 1.6f);

    } else if (*ispec >= 7 && *ispec <= 9) {

/*        Return a value from the common block. */

	ret_val = claenv_1.iparms[*ispec - 1];

    } else if (*ispec == 10) {

/*        IEEE NaN arithmetic can be trusted not to trap */

	ret_val = 1;
	if (ret_val == 1) {
	    ret_val = ieeeck_(&c__0, &c_b3, &c_b4);
	}

    } else if (*ispec == 11) {

/*        Infinity arithmetic can be trusted not to trap */

	ret_val = 1;
	if (ret_val == 1) {
	    ret_val = ieeeck_(&c__1, &c_b3, &c_b4);
	}

    } else {

/*        Invalid value for ISPEC */

	ret_val = -1;
    }

    return ret_val;

/*     End of ILAENV */

} /* ilaenv_ */

