#include "clapack.h"
#include "f2cP.h"

int dlarfp_(integer *n, double *alpha, double *x, integer *incx, double *tau)
{
    /* System generated locals */
    integer i__1;
    double d__1;

    /* Local variables */
    integer j, knt;
    double beta;
    double xnorm;
    double safmin, rsafmn;


/*  -- LAPACK auxiliary routine (version 3.2) -- */
/*     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
/*     November 2006 */

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

/*  Purpose */
/*  ======= */

/*  DLARFP generates a real elementary reflector H of order n, such */
/*  that */

/*        H * ( alpha ) = ( beta ),   H' * H = I. */
/*            (   x   )   (   0  ) */

/*  where alpha and beta are scalars, beta is non-negative, and x is */
/*  an (n-1)-element real vector.  H is represented in the form */

/*        H = I - tau * ( 1 ) * ( 1 v' ) , */
/*                      ( v ) */

/*  where tau is a real scalar and v is a real (n-1)-element */
/*  vector. */

/*  If the elements of x are all zero, then tau = 0 and H is taken to be */
/*  the unit matrix. */

/*  Otherwise  1 <= tau <= 2. */

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

/*  N       (input) INTEGER */
/*          The order of the elementary reflector. */

/*  ALPHA   (input/output) DOUBLE PRECISION */
/*          On entry, the value alpha. */
/*          On exit, it is overwritten with the value beta. */

/*  X       (input/output) DOUBLE PRECISION array, dimension */
/*                         (1+(N-2)*abs(INCX)) */
/*          On entry, the vector x. */
/*          On exit, it is overwritten with the vector v. */

/*  INCX    (input) INTEGER */
/*          The increment between elements of X. INCX > 0. */

/*  TAU     (output) DOUBLE PRECISION */
/*          The value tau. */

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

/*     .. Parameters .. */
/*     .. */
/*     .. Local Scalars .. */
/*     .. */
/*     .. External Functions .. */
/*     .. */
/*     .. Intrinsic Functions .. */
/*     .. */
/*     .. External Subroutines .. */
/*     .. */
/*     .. Executable Statements .. */

    /* Parameter adjustments */
    --x;

    /* Function Body */
    if (*n <= 0) {
	*tau = 0.;
	return 0;
    }

    i__1 = *n - 1;
    xnorm = dnrm2_(&i__1, &x[1], incx);

    if (xnorm == 0.) {

/*        H  =  [+/-1, 0; I], sign chosen so ALPHA >= 0 */

	if (*alpha >= 0.) {
/*           When TAU.eq.ZERO, the vector is special-cased to be */
/*           all zeros in the application routines.  We do not need */
/*           to clear it. */
	    *tau = 0.;
	} else {
/*           However, the application routines rely on explicit */
/*           zero checks when TAU.ne.ZERO, and we must clear X. */
	    *tau = 2.;
	    i__1 = *n - 1;
	    for (j = 1; j <= i__1; ++j) {
		x[(j - 1) * *incx + 1] = 0.;
	    }
	    *alpha = -(*alpha);
	}
    } else {

/*        general case */

	d__1 = dlapy2_(alpha, &xnorm);
	beta = d_sign(&d__1, alpha);
	safmin = dlamch_("S") / dlamch_("E");
	knt = 0;
	if (abs(beta) < safmin) {

/*           XNORM, BETA may be inaccurate; scale X and recompute them */

	    rsafmn = 1. / safmin;
L10:
	    ++knt;
	    i__1 = *n - 1;
	    dscal_(&i__1, &rsafmn, &x[1], incx);
	    beta *= rsafmn;
	    *alpha *= rsafmn;
	    if (abs(beta) < safmin) {
		goto L10;
	    }

/*           New BETA is at most 1, at least SAFMIN */

	    i__1 = *n - 1;
	    xnorm = dnrm2_(&i__1, &x[1], incx);
	    d__1 = dlapy2_(alpha, &xnorm);
	    beta = d_sign(&d__1, alpha);
	}
	*alpha += beta;
	if (beta < 0.) {
	    beta = -beta;
	    *tau = -(*alpha) / beta;
	} else {
	    *alpha = xnorm * (xnorm / *alpha);
	    *tau = *alpha / beta;
	    *alpha = -(*alpha);
	}
	i__1 = *n - 1;
	d__1 = 1. / *alpha;
	dscal_(&i__1, &d__1, &x[1], incx);

/*        If BETA is subnormal, it may lose relative accuracy */

	i__1 = knt;
	for (j = 1; j <= i__1; ++j) {
	    beta *= safmin;
/* L20: */
	}
	*alpha = beta;
    }

    return 0;

/*     End of DLARFP */

} /* dlarfp_ */
