/* cunmbr.f -- translated by f2c (version 20061008).
   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
*/

#include "f2c.h"
#include "blaswrap.h"

/* Table of constant values */

static integer c__1 = 1;
static integer c_n1 = -1;
static integer c__2 = 2;

/* Subroutine */ int cunmbr_(char *vect, char *side, char *trans, integer *m, 
	integer *n, integer *k, complex *a, integer *lda, complex *tau, 
	complex *c__, integer *ldc, complex *work, integer *lwork, integer *
	info)
{
    /* System generated locals */
    address a__1[2];
    integer a_dim1, a_offset, c_dim1, c_offset, i__1, i__2, i__3[2];
    char ch__1[2];

    /* Builtin functions */
    /* Subroutine */ int s_cat(char *, char **, integer *, integer *, ftnlen);

    /* Local variables */
    integer i1, i2, nb, mi, ni, nq, nw;
    logical left;
    extern logical lsame_(char *, char *);
    integer iinfo;
    extern /* Subroutine */ int xerbla_(char *, integer *);
    extern integer ilaenv_(integer *, char *, char *, integer *, integer *, 
	    integer *, integer *);
    extern /* Subroutine */ int cunmlq_(char *, char *, integer *, integer *, 
	    integer *, complex *, integer *, complex *, complex *, integer *, 
	    complex *, integer *, integer *);
    logical notran;
    extern /* Subroutine */ int cunmqr_(char *, char *, integer *, integer *, 
	    integer *, complex *, integer *, complex *, complex *, integer *, 
	    complex *, integer *, integer *);
    logical applyq;
    char transt[1];
    integer lwkopt;
    logical lquery;


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

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

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

/*  If VECT = 'Q', CUNMBR overwrites the general complex M-by-N matrix C */
/*  with */
/*                  SIDE = 'L'     SIDE = 'R' */
/*  TRANS = 'N':      Q * C          C * Q */
/*  TRANS = 'C':      Q**H * C       C * Q**H */

/*  If VECT = 'P', CUNMBR overwrites the general complex M-by-N matrix C */
/*  with */
/*                  SIDE = 'L'     SIDE = 'R' */
/*  TRANS = 'N':      P * C          C * P */
/*  TRANS = 'C':      P**H * C       C * P**H */

/*  Here Q and P**H are the unitary matrices determined by CGEBRD when */
/*  reducing a complex matrix A to bidiagonal form: A = Q * B * P**H. Q */
/*  and P**H are defined as products of elementary reflectors H(i) and */
/*  G(i) respectively. */

/*  Let nq = m if SIDE = 'L' and nq = n if SIDE = 'R'. Thus nq is the */
/*  order of the unitary matrix Q or P**H that is applied. */

/*  If VECT = 'Q', A is assumed to have been an NQ-by-K matrix: */
/*  if nq >= k, Q = H(1) H(2) . . . H(k); */
/*  if nq < k, Q = H(1) H(2) . . . H(nq-1). */

/*  If VECT = 'P', A is assumed to have been a K-by-NQ matrix: */
/*  if k < nq, P = G(1) G(2) . . . G(k); */
/*  if k >= nq, P = G(1) G(2) . . . G(nq-1). */

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

/*  VECT    (input) CHARACTER*1 */
/*          = 'Q': apply Q or Q**H; */
/*          = 'P': apply P or P**H. */

/*  SIDE    (input) CHARACTER*1 */
/*          = 'L': apply Q, Q**H, P or P**H from the Left; */
/*          = 'R': apply Q, Q**H, P or P**H from the Right. */

/*  TRANS   (input) CHARACTER*1 */
/*          = 'N':  No transpose, apply Q or P; */
/*          = 'C':  Conjugate transpose, apply Q**H or P**H. */

/*  M       (input) INTEGER */
/*          The number of rows of the matrix C. M >= 0. */

/*  N       (input) INTEGER */
/*          The number of columns of the matrix C. N >= 0. */

/*  K       (input) INTEGER */
/*          If VECT = 'Q', the number of columns in the original */
/*          matrix reduced by CGEBRD. */
/*          If VECT = 'P', the number of rows in the original */
/*          matrix reduced by CGEBRD. */
/*          K >= 0. */

/*  A       (input) COMPLEX array, dimension */
/*                                (LDA,min(nq,K)) if VECT = 'Q' */
/*                                (LDA,nq)        if VECT = 'P' */
/*          The vectors which define the elementary reflectors H(i) and */
/*          G(i), whose products determine the matrices Q and P, as */
/*          returned by CGEBRD. */

/*  LDA     (input) INTEGER */
/*          The leading dimension of the array A. */
/*          If VECT = 'Q', LDA >= max(1,nq); */
/*          if VECT = 'P', LDA >= max(1,min(nq,K)). */

/*  TAU     (input) COMPLEX array, dimension (min(nq,K)) */
/*          TAU(i) must contain the scalar factor of the elementary */
/*          reflector H(i) or G(i) which determines Q or P, as returned */
/*          by CGEBRD in the array argument TAUQ or TAUP. */

/*  C       (input/output) COMPLEX array, dimension (LDC,N) */
/*          On entry, the M-by-N matrix C. */
/*          On exit, C is overwritten by Q*C or Q**H*C or C*Q**H or C*Q */
/*          or P*C or P**H*C or C*P or C*P**H. */

/*  LDC     (input) INTEGER */
/*          The leading dimension of the array C. LDC >= max(1,M). */

/*  WORK    (workspace/output) COMPLEX array, dimension (MAX(1,LWORK)) */
/*          On exit, if INFO = 0, WORK(1) returns the optimal LWORK. */

/*  LWORK   (input) INTEGER */
/*          The dimension of the array WORK. */
/*          If SIDE = 'L', LWORK >= max(1,N); */
/*          if SIDE = 'R', LWORK >= max(1,M); */
/*          if N = 0 or M = 0, LWORK >= 1. */
/*          For optimum performance LWORK >= max(1,N*NB) if SIDE = 'L', */
/*          and LWORK >= max(1,M*NB) if SIDE = 'R', where NB is the */
/*          optimal blocksize. (NB = 0 if M = 0 or N = 0.) */

/*          If LWORK = -1, then a workspace query is assumed; the routine */
/*          only calculates the optimal size of the WORK array, returns */
/*          this value as the first entry of the WORK array, and no error */
/*          message related to LWORK is issued by XERBLA. */

/*  INFO    (output) INTEGER */
/*          = 0:  successful exit */
/*          < 0:  if INFO = -i, the i-th argument had an illegal value */

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

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

/*     Test the input arguments */

    /* Parameter adjustments */
    a_dim1 = *lda;
    a_offset = 1 + a_dim1;
    a -= a_offset;
    --tau;
    c_dim1 = *ldc;
    c_offset = 1 + c_dim1;
    c__ -= c_offset;
    --work;

    /* Function Body */
    *info = 0;
    applyq = lsame_(vect, "Q");
    left = lsame_(side, "L");
    notran = lsame_(trans, "N");
    lquery = *lwork == -1;

/*     NQ is the order of Q or P and NW is the minimum dimension of WORK */

    if (left) {
	nq = *m;
	nw = *n;
    } else {
	nq = *n;
	nw = *m;
    }
    if (*m == 0 || *n == 0) {
	nw = 0;
    }
    if (! applyq && ! lsame_(vect, "P")) {
	*info = -1;
    } else if (! left && ! lsame_(side, "R")) {
	*info = -2;
    } else if (! notran && ! lsame_(trans, "C")) {
	*info = -3;
    } else if (*m < 0) {
	*info = -4;
    } else if (*n < 0) {
	*info = -5;
    } else if (*k < 0) {
	*info = -6;
    } else /* if(complicated condition) */ {
/* Computing MAX */
	i__1 = 1, i__2 = min(nq,*k);
	if (applyq && *lda < max(1,nq) || ! applyq && *lda < max(i__1,i__2)) {
	    *info = -8;
	} else if (*ldc < max(1,*m)) {
	    *info = -11;
	} else if (*lwork < max(1,nw) && ! lquery) {
	    *info = -13;
	}
    }

    if (*info == 0) {
	if (nw > 0) {
	    if (applyq) {
		if (left) {
/* Writing concatenation */
		    i__3[0] = 1, a__1[0] = side;
		    i__3[1] = 1, a__1[1] = trans;
		    s_cat(ch__1, a__1, i__3, &c__2, (ftnlen)2);
		    i__1 = *m - 1;
		    i__2 = *m - 1;
		    nb = ilaenv_(&c__1, "CUNMQR", ch__1, &i__1, n, &i__2, &
			    c_n1);
		} else {
/* Writing concatenation */
		    i__3[0] = 1, a__1[0] = side;
		    i__3[1] = 1, a__1[1] = trans;
		    s_cat(ch__1, a__1, i__3, &c__2, (ftnlen)2);
		    i__1 = *n - 1;
		    i__2 = *n - 1;
		    nb = ilaenv_(&c__1, "CUNMQR", ch__1, m, &i__1, &i__2, &
			    c_n1);
		}
	    } else {
		if (left) {
/* Writing concatenation */
		    i__3[0] = 1, a__1[0] = side;
		    i__3[1] = 1, a__1[1] = trans;
		    s_cat(ch__1, a__1, i__3, &c__2, (ftnlen)2);
		    i__1 = *m - 1;
		    i__2 = *m - 1;
		    nb = ilaenv_(&c__1, "CUNMLQ", ch__1, &i__1, n, &i__2, &
			    c_n1);
		} else {
/* Writing concatenation */
		    i__3[0] = 1, a__1[0] = side;
		    i__3[1] = 1, a__1[1] = trans;
		    s_cat(ch__1, a__1, i__3, &c__2, (ftnlen)2);
		    i__1 = *n - 1;
		    i__2 = *n - 1;
		    nb = ilaenv_(&c__1, "CUNMLQ", ch__1, m, &i__1, &i__2, &
			    c_n1);
		}
	    }
/* Computing MAX */
	    i__1 = 1, i__2 = nw * nb;
	    lwkopt = max(i__1,i__2);
	} else {
	    lwkopt = 1;
	}
	work[1].r = (real) lwkopt, work[1].i = 0.f;
    }

    if (*info != 0) {
	i__1 = -(*info);
	xerbla_("CUNMBR", &i__1);
	return 0;
    } else if (lquery) {
	return 0;
    }

/*     Quick return if possible */

    if (*m == 0 || *n == 0) {
	return 0;
    }

    if (applyq) {

/*        Apply Q */

	if (nq >= *k) {

/*           Q was determined by a call to CGEBRD with nq >= k */

	    cunmqr_(side, trans, m, n, k, &a[a_offset], lda, &tau[1], &c__[
		    c_offset], ldc, &work[1], lwork, &iinfo);
	} else if (nq > 1) {

/*           Q was determined by a call to CGEBRD with nq < k */

	    if (left) {
		mi = *m - 1;
		ni = *n;
		i1 = 2;
		i2 = 1;
	    } else {
		mi = *m;
		ni = *n - 1;
		i1 = 1;
		i2 = 2;
	    }
	    i__1 = nq - 1;
	    cunmqr_(side, trans, &mi, &ni, &i__1, &a[a_dim1 + 2], lda, &tau[1]
, &c__[i1 + i2 * c_dim1], ldc, &work[1], lwork, &iinfo);
	}
    } else {

/*        Apply P */

	if (notran) {
	    *(unsigned char *)transt = 'C';
	} else {
	    *(unsigned char *)transt = 'N';
	}
	if (nq > *k) {

/*           P was determined by a call to CGEBRD with nq > k */

	    cunmlq_(side, transt, m, n, k, &a[a_offset], lda, &tau[1], &c__[
		    c_offset], ldc, &work[1], lwork, &iinfo);
	} else if (nq > 1) {

/*           P was determined by a call to CGEBRD with nq <= k */

	    if (left) {
		mi = *m - 1;
		ni = *n;
		i1 = 2;
		i2 = 1;
	    } else {
		mi = *m;
		ni = *n - 1;
		i1 = 1;
		i2 = 2;
	    }
	    i__1 = nq - 1;
	    cunmlq_(side, transt, &mi, &ni, &i__1, &a[(a_dim1 << 1) + 1], lda, 
		     &tau[1], &c__[i1 + i2 * c_dim1], ldc, &work[1], lwork, &
		    iinfo);
	}
    }
    work[1].r = (real) lwkopt, work[1].i = 0.f;
    return 0;

/*     End of CUNMBR */

} /* cunmbr_ */