[] add metering mode to CLI

1 files changed, 821 insertions, 0 deletions

diff --git a/contrib/libs/clapack/chptrf.c b/contrib/libs/clapack/chptrf.c
new file mode 100644
index 0000000000..47d93370b6
--- /dev/null
+++ b/contrib/libs/clapack/chptrf.c
@@ -0,0 +1,821 @@
+/* chptrf.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;
+
+/* Subroutine */ int chptrf_(char *uplo, integer *n, complex *ap, integer *
+	ipiv, integer *info)
+{
+    /* System generated locals */
+    integer i__1, i__2, i__3, i__4, i__5, i__6;
+    real r__1, r__2, r__3, r__4;
+    complex q__1, q__2, q__3, q__4, q__5, q__6;
+
+    /* Builtin functions */
+    double sqrt(doublereal), r_imag(complex *);
+    void r_cnjg(complex *, complex *);
+
+    /* Local variables */
+    real d__;
+    integer i__, j, k;
+    complex t;
+    real r1, d11;
+    complex d12;
+    real d22;
+    complex d21;
+    integer kc, kk, kp;
+    complex wk;
+    integer kx;
+    real tt;
+    integer knc, kpc, npp;
+    complex wkm1, wkp1;
+    extern /* Subroutine */ int chpr_(char *, integer *, real *, complex *, 
+	    integer *, complex *);
+    integer imax, jmax;
+    real alpha;
+    extern logical lsame_(char *, char *);
+    extern /* Subroutine */ int cswap_(integer *, complex *, integer *, 
+	    complex *, integer *);
+    integer kstep;
+    logical upper;
+    extern doublereal slapy2_(real *, real *);
+    real absakk;
+    extern integer icamax_(integer *, complex *, integer *);
+    extern /* Subroutine */ int csscal_(integer *, real *, complex *, integer 
+	    *), xerbla_(char *, integer *);
+    real colmax, rowmax;
+
+
+/*  -- LAPACK routine (version 3.2) -- */
+/*     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
+/*     November 2006 */
+
+/*     .. Scalar Arguments .. */
+/*     .. */
+/*     .. Array Arguments .. */
+/*     .. */
+
+/*  Purpose */
+/*  ======= */
+
+/*  CHPTRF computes the factorization of a complex Hermitian packed */
+/*  matrix A using the Bunch-Kaufman diagonal pivoting method: */
+
+/*     A = U*D*U**H  or  A = L*D*L**H */
+
+/*  where U (or L) is a product of permutation and unit upper (lower) */
+/*  triangular matrices, and D is Hermitian and block diagonal with */
+/*  1-by-1 and 2-by-2 diagonal blocks. */
+
+/*  Arguments */
+/*  ========= */
+
+/*  UPLO    (input) CHARACTER*1 */
+/*          = 'U':  Upper triangle of A is stored; */
+/*          = 'L':  Lower triangle of A is stored. */
+
+/*  N       (input) INTEGER */
+/*          The order of the matrix A.  N >= 0. */
+
+/*  AP      (input/output) COMPLEX array, dimension (N*(N+1)/2) */
+/*          On entry, the upper or lower triangle of the Hermitian matrix */
+/*          A, packed columnwise in a linear array.  The j-th column of A */
+/*          is stored in the array AP as follows: */
+/*          if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j; */
+/*          if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n. */
+
+/*          On exit, the block diagonal matrix D and the multipliers used */
+/*          to obtain the factor U or L, stored as a packed triangular */
+/*          matrix overwriting A (see below for further details). */
+
+/*  IPIV    (output) INTEGER array, dimension (N) */
+/*          Details of the interchanges and the block structure of D. */
+/*          If IPIV(k) > 0, then rows and columns k and IPIV(k) were */
+/*          interchanged and D(k,k) is a 1-by-1 diagonal block. */
+/*          If UPLO = 'U' and IPIV(k) = IPIV(k-1) < 0, then rows and */
+/*          columns k-1 and -IPIV(k) were interchanged and D(k-1:k,k-1:k) */
+/*          is a 2-by-2 diagonal block.  If UPLO = 'L' and IPIV(k) = */
+/*          IPIV(k+1) < 0, then rows and columns k+1 and -IPIV(k) were */
+/*          interchanged and D(k:k+1,k:k+1) is a 2-by-2 diagonal block. */
+
+/*  INFO    (output) INTEGER */
+/*          = 0: successful exit */
+/*          < 0: if INFO = -i, the i-th argument had an illegal value */
+/*          > 0: if INFO = i, D(i,i) is exactly zero.  The factorization */
+/*               has been completed, but the block diagonal matrix D is */
+/*               exactly singular, and division by zero will occur if it */
+/*               is used to solve a system of equations. */
+
+/*  Further Details */
+/*  =============== */
+
+/*  5-96 - Based on modifications by J. Lewis, Boeing Computer Services */
+/*         Company */
+
+/*  If UPLO = 'U', then A = U*D*U', where */
+/*     U = P(n)*U(n)* ... *P(k)U(k)* ..., */
+/*  i.e., U is a product of terms P(k)*U(k), where k decreases from n to */
+/*  1 in steps of 1 or 2, and D is a block diagonal matrix with 1-by-1 */
+/*  and 2-by-2 diagonal blocks D(k).  P(k) is a permutation matrix as */
+/*  defined by IPIV(k), and U(k) is a unit upper triangular matrix, such */
+/*  that if the diagonal block D(k) is of order s (s = 1 or 2), then */
+
+/*             (   I    v    0   )   k-s */
+/*     U(k) =  (   0    I    0   )   s */
+/*             (   0    0    I   )   n-k */
+/*                k-s   s   n-k */
+
+/*  If s = 1, D(k) overwrites A(k,k), and v overwrites A(1:k-1,k). */
+/*  If s = 2, the upper triangle of D(k) overwrites A(k-1,k-1), A(k-1,k), */
+/*  and A(k,k), and v overwrites A(1:k-2,k-1:k). */
+
+/*  If UPLO = 'L', then A = L*D*L', where */
+/*     L = P(1)*L(1)* ... *P(k)*L(k)* ..., */
+/*  i.e., L is a product of terms P(k)*L(k), where k increases from 1 to */
+/*  n in steps of 1 or 2, and D is a block diagonal matrix with 1-by-1 */
+/*  and 2-by-2 diagonal blocks D(k).  P(k) is a permutation matrix as */
+/*  defined by IPIV(k), and L(k) is a unit lower triangular matrix, such */
+/*  that if the diagonal block D(k) is of order s (s = 1 or 2), then */
+
+/*             (   I    0     0   )  k-1 */
+/*     L(k) =  (   0    I     0   )  s */
+/*             (   0    v     I   )  n-k-s+1 */
+/*                k-1   s  n-k-s+1 */
+
+/*  If s = 1, D(k) overwrites A(k,k), and v overwrites A(k+1:n,k). */
+/*  If s = 2, the lower triangle of D(k) overwrites A(k,k), A(k+1,k), */
+/*  and A(k+1,k+1), and v overwrites A(k+2:n,k:k+1). */
+
+/*  ===================================================================== */
+
+/*     .. Parameters .. */
+/*     .. */
+/*     .. Local Scalars .. */
+/*     .. */
+/*     .. External Functions .. */
+/*     .. */
+/*     .. External Subroutines .. */
+/*     .. */
+/*     .. Intrinsic Functions .. */
+/*     .. */
+/*     .. Statement Functions .. */
+/*     .. */
+/*     .. Statement Function definitions .. */
+/*     .. */
+/*     .. Executable Statements .. */
+
+/*     Test the input parameters. */
+
+    /* Parameter adjustments */
+    --ipiv;
+    --ap;
+
+    /* Function Body */
+    *info = 0;
+    upper = lsame_(uplo, "U");
+    if (! upper && ! lsame_(uplo, "L")) {
+	*info = -1;
+    } else if (*n < 0) {
+	*info = -2;
+    }
+    if (*info != 0) {
+	i__1 = -(*info);
+	xerbla_("CHPTRF", &i__1);
+	return 0;
+    }
+
+/*     Initialize ALPHA for use in choosing pivot block size. */
+
+    alpha = (sqrt(17.f) + 1.f) / 8.f;
+
+    if (upper) {
+
+/*        Factorize A as U*D*U' using the upper triangle of A */
+
+/*        K is the main loop index, decreasing from N to 1 in steps of */
+/*        1 or 2 */
+
+	k = *n;
+	kc = (*n - 1) * *n / 2 + 1;
+L10:
+	knc = kc;
+
+/*        If K < 1, exit from loop */
+
+	if (k < 1) {
+	    goto L110;
+	}
+	kstep = 1;
+
+/*        Determine rows and columns to be interchanged and whether */
+/*        a 1-by-1 or 2-by-2 pivot block will be used */
+
+	i__1 = kc + k - 1;
+	absakk = (r__1 = ap[i__1].r, dabs(r__1));
+
+/*        IMAX is the row-index of the largest off-diagonal element in */
+/*        column K, and COLMAX is its absolute value */
+
+	if (k > 1) {
+	    i__1 = k - 1;
+	    imax = icamax_(&i__1, &ap[kc], &c__1);
+	    i__1 = kc + imax - 1;
+	    colmax = (r__1 = ap[i__1].r, dabs(r__1)) + (r__2 = r_imag(&ap[kc 
+		    + imax - 1]), dabs(r__2));
+	} else {
+	    colmax = 0.f;
+	}
+
+	if (dmax(absakk,colmax) == 0.f) {
+
+/*           Column K is zero: set INFO and continue */
+
+	    if (*info == 0) {
+		*info = k;
+	    }
+	    kp = k;
+	    i__1 = kc + k - 1;
+	    i__2 = kc + k - 1;
+	    r__1 = ap[i__2].r;
+	    ap[i__1].r = r__1, ap[i__1].i = 0.f;
+	} else {
+	    if (absakk >= alpha * colmax) {
+
+/*              no interchange, use 1-by-1 pivot block */
+
+		kp = k;
+	    } else {
+
+/*              JMAX is the column-index of the largest off-diagonal */
+/*              element in row IMAX, and ROWMAX is its absolute value */
+
+		rowmax = 0.f;
+		jmax = imax;
+		kx = imax * (imax + 1) / 2 + imax;
+		i__1 = k;
+		for (j = imax + 1; j <= i__1; ++j) {
+		    i__2 = kx;
+		    if ((r__1 = ap[i__2].r, dabs(r__1)) + (r__2 = r_imag(&ap[
+			    kx]), dabs(r__2)) > rowmax) {
+			i__2 = kx;
+			rowmax = (r__1 = ap[i__2].r, dabs(r__1)) + (r__2 = 
+				r_imag(&ap[kx]), dabs(r__2));
+			jmax = j;
+		    }
+		    kx += j;
+/* L20: */
+		}
+		kpc = (imax - 1) * imax / 2 + 1;
+		if (imax > 1) {
+		    i__1 = imax - 1;
+		    jmax = icamax_(&i__1, &ap[kpc], &c__1);
+/* Computing MAX */
+		    i__1 = kpc + jmax - 1;
+		    r__3 = rowmax, r__4 = (r__1 = ap[i__1].r, dabs(r__1)) + (
+			    r__2 = r_imag(&ap[kpc + jmax - 1]), dabs(r__2));
+		    rowmax = dmax(r__3,r__4);
+		}
+
+		if (absakk >= alpha * colmax * (colmax / rowmax)) {
+
+/*                 no interchange, use 1-by-1 pivot block */
+
+		    kp = k;
+		} else /* if(complicated condition) */ {
+		    i__1 = kpc + imax - 1;
+		    if ((r__1 = ap[i__1].r, dabs(r__1)) >= alpha * rowmax) {
+
+/*                 interchange rows and columns K and IMAX, use 1-by-1 */
+/*                 pivot block */
+
+			kp = imax;
+		    } else {
+
+/*                 interchange rows and columns K-1 and IMAX, use 2-by-2 */
+/*                 pivot block */
+
+			kp = imax;
+			kstep = 2;
+		    }
+		}
+	    }
+
+	    kk = k - kstep + 1;
+	    if (kstep == 2) {
+		knc = knc - k + 1;
+	    }
+	    if (kp != kk) {
+
+/*              Interchange rows and columns KK and KP in the leading */
+/*              submatrix A(1:k,1:k) */
+
+		i__1 = kp - 1;
+		cswap_(&i__1, &ap[knc], &c__1, &ap[kpc], &c__1);
+		kx = kpc + kp - 1;
+		i__1 = kk - 1;
+		for (j = kp + 1; j <= i__1; ++j) {
+		    kx = kx + j - 1;
+		    r_cnjg(&q__1, &ap[knc + j - 1]);
+		    t.r = q__1.r, t.i = q__1.i;
+		    i__2 = knc + j - 1;
+		    r_cnjg(&q__1, &ap[kx]);
+		    ap[i__2].r = q__1.r, ap[i__2].i = q__1.i;
+		    i__2 = kx;
+		    ap[i__2].r = t.r, ap[i__2].i = t.i;
+/* L30: */
+		}
+		i__1 = kx + kk - 1;
+		r_cnjg(&q__1, &ap[kx + kk - 1]);
+		ap[i__1].r = q__1.r, ap[i__1].i = q__1.i;
+		i__1 = knc + kk - 1;
+		r1 = ap[i__1].r;
+		i__1 = knc + kk - 1;
+		i__2 = kpc + kp - 1;
+		r__1 = ap[i__2].r;
+		ap[i__1].r = r__1, ap[i__1].i = 0.f;
+		i__1 = kpc + kp - 1;
+		ap[i__1].r = r1, ap[i__1].i = 0.f;
+		if (kstep == 2) {
+		    i__1 = kc + k - 1;
+		    i__2 = kc + k - 1;
+		    r__1 = ap[i__2].r;
+		    ap[i__1].r = r__1, ap[i__1].i = 0.f;
+		    i__1 = kc + k - 2;
+		    t.r = ap[i__1].r, t.i = ap[i__1].i;
+		    i__1 = kc + k - 2;
+		    i__2 = kc + kp - 1;
+		    ap[i__1].r = ap[i__2].r, ap[i__1].i = ap[i__2].i;
+		    i__1 = kc + kp - 1;
+		    ap[i__1].r = t.r, ap[i__1].i = t.i;
+		}
+	    } else {
+		i__1 = kc + k - 1;
+		i__2 = kc + k - 1;
+		r__1 = ap[i__2].r;
+		ap[i__1].r = r__1, ap[i__1].i = 0.f;
+		if (kstep == 2) {
+		    i__1 = kc - 1;
+		    i__2 = kc - 1;
+		    r__1 = ap[i__2].r;
+		    ap[i__1].r = r__1, ap[i__1].i = 0.f;
+		}
+	    }
+
+/*           Update the leading submatrix */
+
+	    if (kstep == 1) {
+
+/*              1-by-1 pivot block D(k): column k now holds */
+
+/*              W(k) = U(k)*D(k) */
+
+/*              where U(k) is the k-th column of U */
+
+/*              Perform a rank-1 update of A(1:k-1,1:k-1) as */
+
+/*              A := A - U(k)*D(k)*U(k)' = A - W(k)*1/D(k)*W(k)' */
+
+		i__1 = kc + k - 1;
+		r1 = 1.f / ap[i__1].r;
+		i__1 = k - 1;
+		r__1 = -r1;
+		chpr_(uplo, &i__1, &r__1, &ap[kc], &c__1, &ap[1]);
+
+/*              Store U(k) in column k */
+
+		i__1 = k - 1;
+		csscal_(&i__1, &r1, &ap[kc], &c__1);
+	    } else {
+
+/*              2-by-2 pivot block D(k): columns k and k-1 now hold */
+
+/*              ( W(k-1) W(k) ) = ( U(k-1) U(k) )*D(k) */
+
+/*              where U(k) and U(k-1) are the k-th and (k-1)-th columns */
+/*              of U */
+
+/*              Perform a rank-2 update of A(1:k-2,1:k-2) as */
+
+/*              A := A - ( U(k-1) U(k) )*D(k)*( U(k-1) U(k) )' */
+/*                 = A - ( W(k-1) W(k) )*inv(D(k))*( W(k-1) W(k) )' */
+
+		if (k > 2) {
+
+		    i__1 = k - 1 + (k - 1) * k / 2;
+		    r__1 = ap[i__1].r;
+		    r__2 = r_imag(&ap[k - 1 + (k - 1) * k / 2]);
+		    d__ = slapy2_(&r__1, &r__2);
+		    i__1 = k - 1 + (k - 2) * (k - 1) / 2;
+		    d22 = ap[i__1].r / d__;
+		    i__1 = k + (k - 1) * k / 2;
+		    d11 = ap[i__1].r / d__;
+		    tt = 1.f / (d11 * d22 - 1.f);
+		    i__1 = k - 1 + (k - 1) * k / 2;
+		    q__1.r = ap[i__1].r / d__, q__1.i = ap[i__1].i / d__;
+		    d12.r = q__1.r, d12.i = q__1.i;
+		    d__ = tt / d__;
+
+		    for (j = k - 2; j >= 1; --j) {
+			i__1 = j + (k - 2) * (k - 1) / 2;
+			q__3.r = d11 * ap[i__1].r, q__3.i = d11 * ap[i__1].i;
+			r_cnjg(&q__5, &d12);
+			i__2 = j + (k - 1) * k / 2;
+			q__4.r = q__5.r * ap[i__2].r - q__5.i * ap[i__2].i, 
+				q__4.i = q__5.r * ap[i__2].i + q__5.i * ap[
+				i__2].r;
+			q__2.r = q__3.r - q__4.r, q__2.i = q__3.i - q__4.i;
+			q__1.r = d__ * q__2.r, q__1.i = d__ * q__2.i;
+			wkm1.r = q__1.r, wkm1.i = q__1.i;
+			i__1 = j + (k - 1) * k / 2;
+			q__3.r = d22 * ap[i__1].r, q__3.i = d22 * ap[i__1].i;
+			i__2 = j + (k - 2) * (k - 1) / 2;
+			q__4.r = d12.r * ap[i__2].r - d12.i * ap[i__2].i, 
+				q__4.i = d12.r * ap[i__2].i + d12.i * ap[i__2]
+				.r;
+			q__2.r = q__3.r - q__4.r, q__2.i = q__3.i - q__4.i;
+			q__1.r = d__ * q__2.r, q__1.i = d__ * q__2.i;
+			wk.r = q__1.r, wk.i = q__1.i;
+			for (i__ = j; i__ >= 1; --i__) {
+			    i__1 = i__ + (j - 1) * j / 2;
+			    i__2 = i__ + (j - 1) * j / 2;
+			    i__3 = i__ + (k - 1) * k / 2;
+			    r_cnjg(&q__4, &wk);
+			    q__3.r = ap[i__3].r * q__4.r - ap[i__3].i * 
+				    q__4.i, q__3.i = ap[i__3].r * q__4.i + ap[
+				    i__3].i * q__4.r;
+			    q__2.r = ap[i__2].r - q__3.r, q__2.i = ap[i__2].i 
+				    - q__3.i;
+			    i__4 = i__ + (k - 2) * (k - 1) / 2;
+			    r_cnjg(&q__6, &wkm1);
+			    q__5.r = ap[i__4].r * q__6.r - ap[i__4].i * 
+				    q__6.i, q__5.i = ap[i__4].r * q__6.i + ap[
+				    i__4].i * q__6.r;
+			    q__1.r = q__2.r - q__5.r, q__1.i = q__2.i - 
+				    q__5.i;
+			    ap[i__1].r = q__1.r, ap[i__1].i = q__1.i;
+/* L40: */
+			}
+			i__1 = j + (k - 1) * k / 2;
+			ap[i__1].r = wk.r, ap[i__1].i = wk.i;
+			i__1 = j + (k - 2) * (k - 1) / 2;
+			ap[i__1].r = wkm1.r, ap[i__1].i = wkm1.i;
+			i__1 = j + (j - 1) * j / 2;
+			i__2 = j + (j - 1) * j / 2;
+			r__1 = ap[i__2].r;
+			q__1.r = r__1, q__1.i = 0.f;
+			ap[i__1].r = q__1.r, ap[i__1].i = q__1.i;
+/* L50: */
+		    }
+
+		}
+
+	    }
+	}
+
+/*        Store details of the interchanges in IPIV */
+
+	if (kstep == 1) {
+	    ipiv[k] = kp;
+	} else {
+	    ipiv[k] = -kp;
+	    ipiv[k - 1] = -kp;
+	}
+
+/*        Decrease K and return to the start of the main loop */
+
+	k -= kstep;
+	kc = knc - k;
+	goto L10;
+
+    } else {
+
+/*        Factorize A as L*D*L' using the lower triangle of A */
+
+/*        K is the main loop index, increasing from 1 to N in steps of */
+/*        1 or 2 */
+
+	k = 1;
+	kc = 1;
+	npp = *n * (*n + 1) / 2;
+L60:
+	knc = kc;
+
+/*        If K > N, exit from loop */
+
+	if (k > *n) {
+	    goto L110;
+	}
+	kstep = 1;
+
+/*        Determine rows and columns to be interchanged and whether */
+/*        a 1-by-1 or 2-by-2 pivot block will be used */
+
+	i__1 = kc;
+	absakk = (r__1 = ap[i__1].r, dabs(r__1));
+
+/*        IMAX is the row-index of the largest off-diagonal element in */
+/*        column K, and COLMAX is its absolute value */
+
+	if (k < *n) {
+	    i__1 = *n - k;
+	    imax = k + icamax_(&i__1, &ap[kc + 1], &c__1);
+	    i__1 = kc + imax - k;
+	    colmax = (r__1 = ap[i__1].r, dabs(r__1)) + (r__2 = r_imag(&ap[kc 
+		    + imax - k]), dabs(r__2));
+	} else {
+	    colmax = 0.f;
+	}
+
+	if (dmax(absakk,colmax) == 0.f) {
+
+/*           Column K is zero: set INFO and continue */
+
+	    if (*info == 0) {
+		*info = k;
+	    }
+	    kp = k;
+	    i__1 = kc;
+	    i__2 = kc;
+	    r__1 = ap[i__2].r;
+	    ap[i__1].r = r__1, ap[i__1].i = 0.f;
+	} else {
+	    if (absakk >= alpha * colmax) {
+
+/*              no interchange, use 1-by-1 pivot block */
+
+		kp = k;
+	    } else {
+
+/*              JMAX is the column-index of the largest off-diagonal */
+/*              element in row IMAX, and ROWMAX is its absolute value */
+
+		rowmax = 0.f;
+		kx = kc + imax - k;
+		i__1 = imax - 1;
+		for (j = k; j <= i__1; ++j) {
+		    i__2 = kx;
+		    if ((r__1 = ap[i__2].r, dabs(r__1)) + (r__2 = r_imag(&ap[
+			    kx]), dabs(r__2)) > rowmax) {
+			i__2 = kx;
+			rowmax = (r__1 = ap[i__2].r, dabs(r__1)) + (r__2 = 
+				r_imag(&ap[kx]), dabs(r__2));
+			jmax = j;
+		    }
+		    kx = kx + *n - j;
+/* L70: */
+		}
+		kpc = npp - (*n - imax + 1) * (*n - imax + 2) / 2 + 1;
+		if (imax < *n) {
+		    i__1 = *n - imax;
+		    jmax = imax + icamax_(&i__1, &ap[kpc + 1], &c__1);
+/* Computing MAX */
+		    i__1 = kpc + jmax - imax;
+		    r__3 = rowmax, r__4 = (r__1 = ap[i__1].r, dabs(r__1)) + (
+			    r__2 = r_imag(&ap[kpc + jmax - imax]), dabs(r__2))
+			    ;
+		    rowmax = dmax(r__3,r__4);
+		}
+
+		if (absakk >= alpha * colmax * (colmax / rowmax)) {
+
+/*                 no interchange, use 1-by-1 pivot block */
+
+		    kp = k;
+		} else /* if(complicated condition) */ {
+		    i__1 = kpc;
+		    if ((r__1 = ap[i__1].r, dabs(r__1)) >= alpha * rowmax) {
+
+/*                 interchange rows and columns K and IMAX, use 1-by-1 */
+/*                 pivot block */
+
+			kp = imax;
+		    } else {
+
+/*                 interchange rows and columns K+1 and IMAX, use 2-by-2 */
+/*                 pivot block */
+
+			kp = imax;
+			kstep = 2;
+		    }
+		}
+	    }
+
+	    kk = k + kstep - 1;
+	    if (kstep == 2) {
+		knc = knc + *n - k + 1;
+	    }
+	    if (kp != kk) {
+
+/*              Interchange rows and columns KK and KP in the trailing */
+/*              submatrix A(k:n,k:n) */
+
+		if (kp < *n) {
+		    i__1 = *n - kp;
+		    cswap_(&i__1, &ap[knc + kp - kk + 1], &c__1, &ap[kpc + 1], 
+			     &c__1);
+		}
+		kx = knc + kp - kk;
+		i__1 = kp - 1;
+		for (j = kk + 1; j <= i__1; ++j) {
+		    kx = kx + *n - j + 1;
+		    r_cnjg(&q__1, &ap[knc + j - kk]);
+		    t.r = q__1.r, t.i = q__1.i;
+		    i__2 = knc + j - kk;
+		    r_cnjg(&q__1, &ap[kx]);
+		    ap[i__2].r = q__1.r, ap[i__2].i = q__1.i;
+		    i__2 = kx;
+		    ap[i__2].r = t.r, ap[i__2].i = t.i;
+/* L80: */
+		}
+		i__1 = knc + kp - kk;
+		r_cnjg(&q__1, &ap[knc + kp - kk]);
+		ap[i__1].r = q__1.r, ap[i__1].i = q__1.i;
+		i__1 = knc;
+		r1 = ap[i__1].r;
+		i__1 = knc;
+		i__2 = kpc;
+		r__1 = ap[i__2].r;
+		ap[i__1].r = r__1, ap[i__1].i = 0.f;
+		i__1 = kpc;
+		ap[i__1].r = r1, ap[i__1].i = 0.f;
+		if (kstep == 2) {
+		    i__1 = kc;
+		    i__2 = kc;
+		    r__1 = ap[i__2].r;
+		    ap[i__1].r = r__1, ap[i__1].i = 0.f;
+		    i__1 = kc + 1;
+		    t.r = ap[i__1].r, t.i = ap[i__1].i;
+		    i__1 = kc + 1;
+		    i__2 = kc + kp - k;
+		    ap[i__1].r = ap[i__2].r, ap[i__1].i = ap[i__2].i;
+		    i__1 = kc + kp - k;
+		    ap[i__1].r = t.r, ap[i__1].i = t.i;
+		}
+	    } else {
+		i__1 = kc;
+		i__2 = kc;
+		r__1 = ap[i__2].r;
+		ap[i__1].r = r__1, ap[i__1].i = 0.f;
+		if (kstep == 2) {
+		    i__1 = knc;
+		    i__2 = knc;
+		    r__1 = ap[i__2].r;
+		    ap[i__1].r = r__1, ap[i__1].i = 0.f;
+		}
+	    }
+
+/*           Update the trailing submatrix */
+
+	    if (kstep == 1) {
+
+/*              1-by-1 pivot block D(k): column k now holds */
+
+/*              W(k) = L(k)*D(k) */
+
+/*              where L(k) is the k-th column of L */
+
+		if (k < *n) {
+
+/*                 Perform a rank-1 update of A(k+1:n,k+1:n) as */
+
+/*                 A := A - L(k)*D(k)*L(k)' = A - W(k)*(1/D(k))*W(k)' */
+
+		    i__1 = kc;
+		    r1 = 1.f / ap[i__1].r;
+		    i__1 = *n - k;
+		    r__1 = -r1;
+		    chpr_(uplo, &i__1, &r__1, &ap[kc + 1], &c__1, &ap[kc + *n 
+			    - k + 1]);
+
+/*                 Store L(k) in column K */
+
+		    i__1 = *n - k;
+		    csscal_(&i__1, &r1, &ap[kc + 1], &c__1);
+		}
+	    } else {
+
+/*              2-by-2 pivot block D(k): columns K and K+1 now hold */
+
+/*              ( W(k) W(k+1) ) = ( L(k) L(k+1) )*D(k) */
+
+/*              where L(k) and L(k+1) are the k-th and (k+1)-th columns */
+/*              of L */
+
+		if (k < *n - 1) {
+
+/*                 Perform a rank-2 update of A(k+2:n,k+2:n) as */
+
+/*                 A := A - ( L(k) L(k+1) )*D(k)*( L(k) L(k+1) )' */
+/*                    = A - ( W(k) W(k+1) )*inv(D(k))*( W(k) W(k+1) )' */
+
+/*                 where L(k) and L(k+1) are the k-th and (k+1)-th */
+/*                 columns of L */
+
+		    i__1 = k + 1 + (k - 1) * ((*n << 1) - k) / 2;
+		    r__1 = ap[i__1].r;
+		    r__2 = r_imag(&ap[k + 1 + (k - 1) * ((*n << 1) - k) / 2]);
+		    d__ = slapy2_(&r__1, &r__2);
+		    i__1 = k + 1 + k * ((*n << 1) - k - 1) / 2;
+		    d11 = ap[i__1].r / d__;
+		    i__1 = k + (k - 1) * ((*n << 1) - k) / 2;
+		    d22 = ap[i__1].r / d__;
+		    tt = 1.f / (d11 * d22 - 1.f);
+		    i__1 = k + 1 + (k - 1) * ((*n << 1) - k) / 2;
+		    q__1.r = ap[i__1].r / d__, q__1.i = ap[i__1].i / d__;
+		    d21.r = q__1.r, d21.i = q__1.i;
+		    d__ = tt / d__;
+
+		    i__1 = *n;
+		    for (j = k + 2; j <= i__1; ++j) {
+			i__2 = j + (k - 1) * ((*n << 1) - k) / 2;
+			q__3.r = d11 * ap[i__2].r, q__3.i = d11 * ap[i__2].i;
+			i__3 = j + k * ((*n << 1) - k - 1) / 2;
+			q__4.r = d21.r * ap[i__3].r - d21.i * ap[i__3].i, 
+				q__4.i = d21.r * ap[i__3].i + d21.i * ap[i__3]
+				.r;
+			q__2.r = q__3.r - q__4.r, q__2.i = q__3.i - q__4.i;
+			q__1.r = d__ * q__2.r, q__1.i = d__ * q__2.i;
+			wk.r = q__1.r, wk.i = q__1.i;
+			i__2 = j + k * ((*n << 1) - k - 1) / 2;
+			q__3.r = d22 * ap[i__2].r, q__3.i = d22 * ap[i__2].i;
+			r_cnjg(&q__5, &d21);
+			i__3 = j + (k - 1) * ((*n << 1) - k) / 2;
+			q__4.r = q__5.r * ap[i__3].r - q__5.i * ap[i__3].i, 
+				q__4.i = q__5.r * ap[i__3].i + q__5.i * ap[
+				i__3].r;
+			q__2.r = q__3.r - q__4.r, q__2.i = q__3.i - q__4.i;
+			q__1.r = d__ * q__2.r, q__1.i = d__ * q__2.i;
+			wkp1.r = q__1.r, wkp1.i = q__1.i;
+			i__2 = *n;
+			for (i__ = j; i__ <= i__2; ++i__) {
+			    i__3 = i__ + (j - 1) * ((*n << 1) - j) / 2;
+			    i__4 = i__ + (j - 1) * ((*n << 1) - j) / 2;
+			    i__5 = i__ + (k - 1) * ((*n << 1) - k) / 2;
+			    r_cnjg(&q__4, &wk);
+			    q__3.r = ap[i__5].r * q__4.r - ap[i__5].i * 
+				    q__4.i, q__3.i = ap[i__5].r * q__4.i + ap[
+				    i__5].i * q__4.r;
+			    q__2.r = ap[i__4].r - q__3.r, q__2.i = ap[i__4].i 
+				    - q__3.i;
+			    i__6 = i__ + k * ((*n << 1) - k - 1) / 2;
+			    r_cnjg(&q__6, &wkp1);
+			    q__5.r = ap[i__6].r * q__6.r - ap[i__6].i * 
+				    q__6.i, q__5.i = ap[i__6].r * q__6.i + ap[
+				    i__6].i * q__6.r;
+			    q__1.r = q__2.r - q__5.r, q__1.i = q__2.i - 
+				    q__5.i;
+			    ap[i__3].r = q__1.r, ap[i__3].i = q__1.i;
+/* L90: */
+			}
+			i__2 = j + (k - 1) * ((*n << 1) - k) / 2;
+			ap[i__2].r = wk.r, ap[i__2].i = wk.i;
+			i__2 = j + k * ((*n << 1) - k - 1) / 2;
+			ap[i__2].r = wkp1.r, ap[i__2].i = wkp1.i;
+			i__2 = j + (j - 1) * ((*n << 1) - j) / 2;
+			i__3 = j + (j - 1) * ((*n << 1) - j) / 2;
+			r__1 = ap[i__3].r;
+			q__1.r = r__1, q__1.i = 0.f;
+			ap[i__2].r = q__1.r, ap[i__2].i = q__1.i;
+/* L100: */
+		    }
+		}
+	    }
+	}
+
+/*        Store details of the interchanges in IPIV */
+
+	if (kstep == 1) {
+	    ipiv[k] = kp;
+	} else {
+	    ipiv[k] = -kp;
+	    ipiv[k + 1] = -kp;
+	}
+
+/*        Increase K and return to the start of the main loop */
+
+	k += kstep;
+	kc = knc + *n - k + 2;
+	goto L60;
+
+    }
+
+L110:
+    return 0;
+
+/*     End of CHPTRF */
+
+} /* chptrf_ */