/* fortran/dlabad.f -- translated by f2c (version 20200916).
   You must link the resulting object file with libf2c:
        on Microsoft Windows system, link with libf2c.lib;
        on Linux or Unix systems, link with .../path/to/libf2c.a -lm
        or, if you install libf2c.a in a standard place, with -lf2c -lm
        -- in that order, at the end of the command line, as in
                cc *.o -lf2c -lm
        Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,

                http://www.netlib.org/f2c/libf2c.zip
*/

#ifdef __cplusplus
extern "C" {
#endif
#include "lmp_f2c.h"

/* > \brief \b DLABAD */

/*  =========== DOCUMENTATION =========== */

/* Online html documentation available at */
/*            http://www.netlib.org/lapack/explore-html/ */

/* > \htmlonly */
/* > Download DLABAD + dependencies */
/* > <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlabad.
f"> */
/* > [TGZ]</a> */
/* > <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlabad.
f"> */
/* > [ZIP]</a> */
/* > <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlabad.
f"> */
/* > [TXT]</a> */
/* > \endhtmlonly */

/*  Definition: */
/*  =========== */

/*       SUBROUTINE DLABAD( SMALL, LARGE ) */

/*       .. Scalar Arguments .. */
/*       DOUBLE PRECISION   LARGE, SMALL */
/*       .. */


/* > \par Purpose: */
/*  ============= */
/* > */
/* > \verbatim */
/* > */
/* > DLABAD takes as input the values computed by DLAMCH for underflow and */
/* > overflow, and returns the square root of each of these values if the */
/* > log of LARGE is sufficiently large.  This subroutine is intended to */
/* > identify machines with a large exponent range, such as the Crays, and */
/* > redefine the underflow and overflow limits to be the square roots of */
/* > the values computed by DLAMCH.  This subroutine is needed because */
/* > DLAMCH does not compensate for poor arithmetic in the upper half of */
/* > the exponent range, as is found on a Cray. */
/* > \endverbatim */

/*  Arguments: */
/*  ========== */

/* > \param[in,out] SMALL */
/* > \verbatim */
/* >          SMALL is DOUBLE PRECISION */
/* >          On entry, the underflow threshold as computed by DLAMCH. */
/* >          On exit, if LOG10(LARGE) is sufficiently large, the square */
/* >          root of SMALL, otherwise unchanged. */
/* > \endverbatim */
/* > */
/* > \param[in,out] LARGE */
/* > \verbatim */
/* >          LARGE is DOUBLE PRECISION */
/* >          On entry, the overflow threshold as computed by DLAMCH. */
/* >          On exit, if LOG10(LARGE) is sufficiently large, the square */
/* >          root of LARGE, otherwise unchanged. */
/* > \endverbatim */

/*  Authors: */
/*  ======== */

/* > \author Univ. of Tennessee */
/* > \author Univ. of California Berkeley */
/* > \author Univ. of Colorado Denver */
/* > \author NAG Ltd. */

/* > \ingroup OTHERauxiliary */

/*  ===================================================================== */
/* Subroutine */ int dlabad_(doublereal *small, doublereal *large)
{
    /* Builtin functions */
    double d_lmp_lg10(doublereal *), sqrt(doublereal);


/*  -- LAPACK auxiliary routine -- */
/*  -- LAPACK is a software package provided by Univ. of Tennessee,    -- */
/*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- */

/*     .. Scalar Arguments .. */
/*     .. */

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

/*     .. Intrinsic Functions .. */
/*     .. */
/*     .. Executable Statements .. */

/*     If it looks like we're on a Cray, take the square root of */
/*     SMALL and LARGE to avoid overflow and underflow problems. */

    if (d_lmp_lg10(large) > 2e3) {
        *small = sqrt(*small);
        *large = sqrt(*large);
    }

    return 0;

/*     End of DLABAD */

} /* dlabad_ */

#ifdef __cplusplus
        }
#endif