OpenBLAS/lapack-netlib/SRC/ssytrf_rk.c

#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <complex.h>
#ifdef complex
#undef complex
#endif
#ifdef I
#undef I
#endif

#if defined(_WIN64)
typedef long long BLASLONG;
typedef unsigned long long BLASULONG;
#else
typedef long BLASLONG;
typedef unsigned long BLASULONG;
#endif

#ifdef LAPACK_ILP64
typedef BLASLONG blasint;
#if defined(_WIN64)
#define blasabs(x) llabs(x)
#else
#define blasabs(x) labs(x)
#endif
#else
typedef int blasint;
#define blasabs(x) abs(x)
#endif

typedef blasint integer;

typedef unsigned int uinteger;
typedef char *address;
typedef short int shortint;
typedef float real;
typedef double doublereal;
typedef struct { real r, i; } complex;
typedef struct { doublereal r, i; } doublecomplex;
#ifdef _MSC_VER
static inline _Fcomplex Cf(complex *z) {_Fcomplex zz={z->r , z->i}; return zz;}
static inline _Dcomplex Cd(doublecomplex *z) {_Dcomplex zz={z->r , z->i};return zz;}
static inline _Fcomplex * _pCf(complex *z) {return (_Fcomplex*)z;}
static inline _Dcomplex * _pCd(doublecomplex *z) {return (_Dcomplex*)z;}
#else
static inline _Complex float Cf(complex *z) {return z->r + z->i*_Complex_I;}
static inline _Complex double Cd(doublecomplex *z) {return z->r + z->i*_Complex_I;}
static inline _Complex float * _pCf(complex *z) {return (_Complex float*)z;}
static inline _Complex double * _pCd(doublecomplex *z) {return (_Complex double*)z;}
#endif
#define pCf(z) (*_pCf(z))
#define pCd(z) (*_pCd(z))
typedef int logical;
typedef short int shortlogical;
typedef char logical1;
typedef char integer1;

#define TRUE_ (1)
#define FALSE_ (0)

/* Extern is for use with -E */
#ifndef Extern
#define Extern extern
#endif

/* I/O stuff */

typedef int flag;
typedef int ftnlen;
typedef int ftnint;

/*external read, write*/
typedef struct
{	flag cierr;
	ftnint ciunit;
	flag ciend;
	char *cifmt;
	ftnint cirec;
} cilist;

/*internal read, write*/
typedef struct
{	flag icierr;
	char *iciunit;
	flag iciend;
	char *icifmt;
	ftnint icirlen;
	ftnint icirnum;
} icilist;

/*open*/
typedef struct
{	flag oerr;
	ftnint ounit;
	char *ofnm;
	ftnlen ofnmlen;
	char *osta;
	char *oacc;
	char *ofm;
	ftnint orl;
	char *oblnk;
} olist;

/*close*/
typedef struct
{	flag cerr;
	ftnint cunit;
	char *csta;
} cllist;

/*rewind, backspace, endfile*/
typedef struct
{	flag aerr;
	ftnint aunit;
} alist;

/* inquire */
typedef struct
{	flag inerr;
	ftnint inunit;
	char *infile;
	ftnlen infilen;
	ftnint	*inex;	/*parameters in standard's order*/
	ftnint	*inopen;
	ftnint	*innum;
	ftnint	*innamed;
	char	*inname;
	ftnlen	innamlen;
	char	*inacc;
	ftnlen	inacclen;
	char	*inseq;
	ftnlen	inseqlen;
	char 	*indir;
	ftnlen	indirlen;
	char	*infmt;
	ftnlen	infmtlen;
	char	*inform;
	ftnint	informlen;
	char	*inunf;
	ftnlen	inunflen;
	ftnint	*inrecl;
	ftnint	*innrec;
	char	*inblank;
	ftnlen	inblanklen;
} inlist;

#define VOID void

union Multitype {	/* for multiple entry points */
	integer1 g;
	shortint h;
	integer i;
	/* longint j; */
	real r;
	doublereal d;
	complex c;
	doublecomplex z;
	};

typedef union Multitype Multitype;

struct Vardesc {	/* for Namelist */
	char *name;
	char *addr;
	ftnlen *dims;
	int  type;
	};
typedef struct Vardesc Vardesc;

struct Namelist {
	char *name;
	Vardesc **vars;
	int nvars;
	};
typedef struct Namelist Namelist;

#define abs(x) ((x) >= 0 ? (x) : -(x))
#define dabs(x) (fabs(x))
#define f2cmin(a,b) ((a) <= (b) ? (a) : (b))
#define f2cmax(a,b) ((a) >= (b) ? (a) : (b))
#define dmin(a,b) (f2cmin(a,b))
#define dmax(a,b) (f2cmax(a,b))
#define bit_test(a,b)	((a) >> (b) & 1)
#define bit_clear(a,b)	((a) & ~((uinteger)1 << (b)))
#define bit_set(a,b)	((a) |  ((uinteger)1 << (b)))

#define abort_() { sig_die("Fortran abort routine called", 1); }
#define c_abs(z) (cabsf(Cf(z)))
#define c_cos(R,Z) { pCf(R)=ccos(Cf(Z)); }
#ifdef _MSC_VER
#define c_div(c, a, b) {Cf(c)._Val[0] = (Cf(a)._Val[0]/Cf(b)._Val[0]); Cf(c)._Val[1]=(Cf(a)._Val[1]/Cf(b)._Val[1]);}
#define z_div(c, a, b) {Cd(c)._Val[0] = (Cd(a)._Val[0]/Cd(b)._Val[0]); Cd(c)._Val[1]=(Cd(a)._Val[1]/df(b)._Val[1]);}
#else
#define c_div(c, a, b) {pCf(c) = Cf(a)/Cf(b);}
#define z_div(c, a, b) {pCd(c) = Cd(a)/Cd(b);}
#endif
#define c_exp(R, Z) {pCf(R) = cexpf(Cf(Z));}
#define c_log(R, Z) {pCf(R) = clogf(Cf(Z));}
#define c_sin(R, Z) {pCf(R) = csinf(Cf(Z));}
//#define c_sqrt(R, Z) {*(R) = csqrtf(Cf(Z));}
#define c_sqrt(R, Z) {pCf(R) = csqrtf(Cf(Z));}
#define d_abs(x) (fabs(*(x)))
#define d_acos(x) (acos(*(x)))
#define d_asin(x) (asin(*(x)))
#define d_atan(x) (atan(*(x)))
#define d_atn2(x, y) (atan2(*(x),*(y)))
#define d_cnjg(R, Z) { pCd(R) = conj(Cd(Z)); }
#define r_cnjg(R, Z) { pCf(R) = conjf(Cf(Z)); }
#define d_cos(x) (cos(*(x)))
#define d_cosh(x) (cosh(*(x)))
#define d_dim(__a, __b) ( *(__a) > *(__b) ? *(__a) - *(__b) : 0.0 )
#define d_exp(x) (exp(*(x)))
#define d_imag(z) (cimag(Cd(z)))
#define r_imag(z) (cimagf(Cf(z)))
#define d_int(__x) (*(__x)>0 ? floor(*(__x)) : -floor(- *(__x)))
#define r_int(__x) (*(__x)>0 ? floor(*(__x)) : -floor(- *(__x)))
#define d_lg10(x) ( 0.43429448190325182765 * log(*(x)) )
#define r_lg10(x) ( 0.43429448190325182765 * log(*(x)) )
#define d_log(x) (log(*(x)))
#define d_mod(x, y) (fmod(*(x), *(y)))
#define u_nint(__x) ((__x)>=0 ? floor((__x) + .5) : -floor(.5 - (__x)))
#define d_nint(x) u_nint(*(x))
#define u_sign(__a,__b) ((__b) >= 0 ? ((__a) >= 0 ? (__a) : -(__a)) : -((__a) >= 0 ? (__a) : -(__a)))
#define d_sign(a,b) u_sign(*(a),*(b))
#define r_sign(a,b) u_sign(*(a),*(b))
#define d_sin(x) (sin(*(x)))
#define d_sinh(x) (sinh(*(x)))
#define d_sqrt(x) (sqrt(*(x)))
#define d_tan(x) (tan(*(x)))
#define d_tanh(x) (tanh(*(x)))
#define i_abs(x) abs(*(x))
#define i_dnnt(x) ((integer)u_nint(*(x)))
#define i_len(s, n) (n)
#define i_nint(x) ((integer)u_nint(*(x)))
#define i_sign(a,b) ((integer)u_sign((integer)*(a),(integer)*(b)))
#define pow_dd(ap, bp) ( pow(*(ap), *(bp)))
#define pow_si(B,E) spow_ui(*(B),*(E))
#define pow_ri(B,E) spow_ui(*(B),*(E))
#define pow_di(B,E) dpow_ui(*(B),*(E))
#define pow_zi(p, a, b) {pCd(p) = zpow_ui(Cd(a), *(b));}
#define pow_ci(p, a, b) {pCf(p) = cpow_ui(Cf(a), *(b));}
#define pow_zz(R,A,B) {pCd(R) = cpow(Cd(A),*(B));}
#define s_cat(lpp, rpp, rnp, np, llp) { 	ftnlen i, nc, ll; char *f__rp, *lp; 	ll = (llp); lp = (lpp); 	for(i=0; i < (int)*(np); ++i) {         	nc = ll; 	        if((rnp)[i] < nc) nc = (rnp)[i]; 	        ll -= nc;         	f__rp = (rpp)[i]; 	        while(--nc >= 0) *lp++ = *(f__rp)++;         } 	while(--ll >= 0) *lp++ = ' '; }
#define s_cmp(a,b,c,d) ((integer)strncmp((a),(b),f2cmin((c),(d))))
#define s_copy(A,B,C,D) { int __i,__m; for (__i=0, __m=f2cmin((C),(D)); __i<__m && (B)[__i] != 0; ++__i) (A)[__i] = (B)[__i]; }
#define sig_die(s, kill) { exit(1); }
#define s_stop(s, n) {exit(0);}
static char junk[] = "\n@(#)LIBF77 VERSION 19990503\n";
#define z_abs(z) (cabs(Cd(z)))
#define z_exp(R, Z) {pCd(R) = cexp(Cd(Z));}
#define z_sqrt(R, Z) {pCd(R) = csqrt(Cd(Z));}
#define myexit_() break;
#define mycycle() continue;
#define myceiling(w) {ceil(w)}
#define myhuge(w) {HUGE_VAL}
//#define mymaxloc_(w,s,e,n) {if (sizeof(*(w)) == sizeof(double)) dmaxloc_((w),*(s),*(e),n); else dmaxloc_((w),*(s),*(e),n);}
#define mymaxloc(w,s,e,n) {dmaxloc_(w,*(s),*(e),n)}

/* procedure parameter types for -A and -C++ */

#define F2C_proc_par_types 1
#ifdef __cplusplus
typedef logical (*L_fp)(...);
#else
typedef logical (*L_fp)();
#endif

static float spow_ui(float x, integer n) {
	float pow=1.0; unsigned long int u;
	if(n != 0) {
		if(n < 0) n = -n, x = 1/x;
		for(u = n; ; ) {
			if(u & 01) pow *= x;
			if(u >>= 1) x *= x;
			else break;
		}
	}
	return pow;
}
static double dpow_ui(double x, integer n) {
	double pow=1.0; unsigned long int u;
	if(n != 0) {
		if(n < 0) n = -n, x = 1/x;
		for(u = n; ; ) {
			if(u & 01) pow *= x;
			if(u >>= 1) x *= x;
			else break;
		}
	}
	return pow;
}
#ifdef _MSC_VER
static _Fcomplex cpow_ui(complex x, integer n) {
	complex pow={1.0,0.0}; unsigned long int u;
		if(n != 0) {
		if(n < 0) n = -n, x.r = 1/x.r, x.i=1/x.i;
		for(u = n; ; ) {
			if(u & 01) pow.r *= x.r, pow.i *= x.i;
			if(u >>= 1) x.r *= x.r, x.i *= x.i;
			else break;
		}
	}
	_Fcomplex p={pow.r, pow.i};
	return p;
}
#else
static _Complex float cpow_ui(_Complex float x, integer n) {
	_Complex float pow=1.0; unsigned long int u;
	if(n != 0) {
		if(n < 0) n = -n, x = 1/x;
		for(u = n; ; ) {
			if(u & 01) pow *= x;
			if(u >>= 1) x *= x;
			else break;
		}
	}
	return pow;
}
#endif
#ifdef _MSC_VER
static _Dcomplex zpow_ui(_Dcomplex x, integer n) {
	_Dcomplex pow={1.0,0.0}; unsigned long int u;
	if(n != 0) {
		if(n < 0) n = -n, x._Val[0] = 1/x._Val[0], x._Val[1] =1/x._Val[1];
		for(u = n; ; ) {
			if(u & 01) pow._Val[0] *= x._Val[0], pow._Val[1] *= x._Val[1];
			if(u >>= 1) x._Val[0] *= x._Val[0], x._Val[1] *= x._Val[1];
			else break;
		}
	}
	_Dcomplex p = {pow._Val[0], pow._Val[1]};
	return p;
}
#else
static _Complex double zpow_ui(_Complex double x, integer n) {
	_Complex double pow=1.0; unsigned long int u;
	if(n != 0) {
		if(n < 0) n = -n, x = 1/x;
		for(u = n; ; ) {
			if(u & 01) pow *= x;
			if(u >>= 1) x *= x;
			else break;
		}
	}
	return pow;
}
#endif
static integer pow_ii(integer x, integer n) {
	integer pow; unsigned long int u;
	if (n <= 0) {
		if (n == 0 || x == 1) pow = 1;
		else if (x != -1) pow = x == 0 ? 1/x : 0;
		else n = -n;
	}
	if ((n > 0) || !(n == 0 || x == 1 || x != -1)) {
		u = n;
		for(pow = 1; ; ) {
			if(u & 01) pow *= x;
			if(u >>= 1) x *= x;
			else break;
		}
	}
	return pow;
}
static integer dmaxloc_(double *w, integer s, integer e, integer *n)
{
	double m; integer i, mi;
	for(m=w[s-1], mi=s, i=s+1; i<=e; i++)
		if (w[i-1]>m) mi=i ,m=w[i-1];
	return mi-s+1;
}
static integer smaxloc_(float *w, integer s, integer e, integer *n)
{
	float m; integer i, mi;
	for(m=w[s-1], mi=s, i=s+1; i<=e; i++)
		if (w[i-1]>m) mi=i ,m=w[i-1];
	return mi-s+1;
}
static inline void cdotc_(complex *z, integer *n_, complex *x, integer *incx_, complex *y, integer *incy_) {
	integer n = *n_, incx = *incx_, incy = *incy_, i;
#ifdef _MSC_VER
	_Fcomplex zdotc = {0.0, 0.0};
	if (incx == 1 && incy == 1) {
		for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
			zdotc._Val[0] += conjf(Cf(&x[i]))._Val[0] * Cf(&y[i])._Val[0];
			zdotc._Val[1] += conjf(Cf(&x[i]))._Val[1] * Cf(&y[i])._Val[1];
		}
	} else {
		for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
			zdotc._Val[0] += conjf(Cf(&x[i*incx]))._Val[0] * Cf(&y[i*incy])._Val[0];
			zdotc._Val[1] += conjf(Cf(&x[i*incx]))._Val[1] * Cf(&y[i*incy])._Val[1];
		}
	}
	pCf(z) = zdotc;
}
#else
	_Complex float zdotc = 0.0;
	if (incx == 1 && incy == 1) {
		for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
			zdotc += conjf(Cf(&x[i])) * Cf(&y[i]);
		}
	} else {
		for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
			zdotc += conjf(Cf(&x[i*incx])) * Cf(&y[i*incy]);
		}
	}
	pCf(z) = zdotc;
}
#endif
static inline void zdotc_(doublecomplex *z, integer *n_, doublecomplex *x, integer *incx_, doublecomplex *y, integer *incy_) {
	integer n = *n_, incx = *incx_, incy = *incy_, i;
#ifdef _MSC_VER
	_Dcomplex zdotc = {0.0, 0.0};
	if (incx == 1 && incy == 1) {
		for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
			zdotc._Val[0] += conj(Cd(&x[i]))._Val[0] * Cd(&y[i])._Val[0];
			zdotc._Val[1] += conj(Cd(&x[i]))._Val[1] * Cd(&y[i])._Val[1];
		}
	} else {
		for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
			zdotc._Val[0] += conj(Cd(&x[i*incx]))._Val[0] * Cd(&y[i*incy])._Val[0];
			zdotc._Val[1] += conj(Cd(&x[i*incx]))._Val[1] * Cd(&y[i*incy])._Val[1];
		}
	}
	pCd(z) = zdotc;
}
#else
	_Complex double zdotc = 0.0;
	if (incx == 1 && incy == 1) {
		for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
			zdotc += conj(Cd(&x[i])) * Cd(&y[i]);
		}
	} else {
		for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
			zdotc += conj(Cd(&x[i*incx])) * Cd(&y[i*incy]);
		}
	}
	pCd(z) = zdotc;
}
#endif	
static inline void cdotu_(complex *z, integer *n_, complex *x, integer *incx_, complex *y, integer *incy_) {
	integer n = *n_, incx = *incx_, incy = *incy_, i;
#ifdef _MSC_VER
	_Fcomplex zdotc = {0.0, 0.0};
	if (incx == 1 && incy == 1) {
		for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
			zdotc._Val[0] += Cf(&x[i])._Val[0] * Cf(&y[i])._Val[0];
			zdotc._Val[1] += Cf(&x[i])._Val[1] * Cf(&y[i])._Val[1];
		}
	} else {
		for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
			zdotc._Val[0] += Cf(&x[i*incx])._Val[0] * Cf(&y[i*incy])._Val[0];
			zdotc._Val[1] += Cf(&x[i*incx])._Val[1] * Cf(&y[i*incy])._Val[1];
		}
	}
	pCf(z) = zdotc;
}
#else
	_Complex float zdotc = 0.0;
	if (incx == 1 && incy == 1) {
		for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
			zdotc += Cf(&x[i]) * Cf(&y[i]);
		}
	} else {
		for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
			zdotc += Cf(&x[i*incx]) * Cf(&y[i*incy]);
		}
	}
	pCf(z) = zdotc;
}
#endif
static inline void zdotu_(doublecomplex *z, integer *n_, doublecomplex *x, integer *incx_, doublecomplex *y, integer *incy_) {
	integer n = *n_, incx = *incx_, incy = *incy_, i;
#ifdef _MSC_VER
	_Dcomplex zdotc = {0.0, 0.0};
	if (incx == 1 && incy == 1) {
		for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
			zdotc._Val[0] += Cd(&x[i])._Val[0] * Cd(&y[i])._Val[0];
			zdotc._Val[1] += Cd(&x[i])._Val[1] * Cd(&y[i])._Val[1];
		}
	} else {
		for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
			zdotc._Val[0] += Cd(&x[i*incx])._Val[0] * Cd(&y[i*incy])._Val[0];
			zdotc._Val[1] += Cd(&x[i*incx])._Val[1] * Cd(&y[i*incy])._Val[1];
		}
	}
	pCd(z) = zdotc;
}
#else
	_Complex double zdotc = 0.0;
	if (incx == 1 && incy == 1) {
		for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
			zdotc += Cd(&x[i]) * Cd(&y[i]);
		}
	} else {
		for (i=0;i<n;i++) { /* zdotc = zdotc + dconjg(x(i))* y(i) */
			zdotc += Cd(&x[i*incx]) * Cd(&y[i*incy]);
		}
	}
	pCd(z) = zdotc;
}
#endif
/*  -- translated by f2c (version 20000121).
   You must link the resulting object file with the libraries:
	-lf2c -lm   (in that order)
*/




/* Table of constant values */

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

/* > \brief \b SSYTRF_RK computes the factorization of a real symmetric indefinite matrix using the bounded Bu
nch-Kaufman (rook) diagonal pivoting method (BLAS3 blocked algorithm). */

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

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

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

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

/*       SUBROUTINE SSYTRF_RK( UPLO, N, A, LDA, E, IPIV, WORK, LWORK, */
/*                             INFO ) */

/*       CHARACTER          UPLO */
/*       INTEGER            INFO, LDA, LWORK, N */
/*       INTEGER            IPIV( * ) */
/*       REAL               A( LDA, * ), E ( * ), WORK( * ) */


/* > \par Purpose: */
/*  ============= */
/* > */
/* > \verbatim */
/* > SSYTRF_RK computes the factorization of a real symmetric matrix A */
/* > using the bounded Bunch-Kaufman (rook) diagonal pivoting method: */
/* > */
/* >    A = P*U*D*(U**T)*(P**T) or A = P*L*D*(L**T)*(P**T), */
/* > */
/* > where U (or L) is unit upper (or lower) triangular matrix, */
/* > U**T (or L**T) is the transpose of U (or L), P is a permutation */
/* > matrix, P**T is the transpose of P, and D is symmetric and block */
/* > diagonal with 1-by-1 and 2-by-2 diagonal blocks. */
/* > */
/* > This is the blocked version of the algorithm, calling Level 3 BLAS. */
/* > For more information see Further Details section. */
/* > \endverbatim */

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

/* > \param[in] UPLO */
/* > \verbatim */
/* >          UPLO is CHARACTER*1 */
/* >          Specifies whether the upper or lower triangular part of the */
/* >          symmetric matrix A is stored: */
/* >          = 'U':  Upper triangular */
/* >          = 'L':  Lower triangular */
/* > \endverbatim */
/* > */
/* > \param[in] N */
/* > \verbatim */
/* >          N is INTEGER */
/* >          The order of the matrix A.  N >= 0. */
/* > \endverbatim */
/* > */
/* > \param[in,out] A */
/* > \verbatim */
/* >          A is REAL array, dimension (LDA,N) */
/* >          On entry, the symmetric matrix A. */
/* >            If UPLO = 'U': the leading N-by-N upper triangular part */
/* >            of A contains the upper triangular part of the matrix A, */
/* >            and the strictly lower triangular part of A is not */
/* >            referenced. */
/* > */
/* >            If UPLO = 'L': the leading N-by-N lower triangular part */
/* >            of A contains the lower triangular part of the matrix A, */
/* >            and the strictly upper triangular part of A is not */
/* >            referenced. */
/* > */
/* >          On exit, contains: */
/* >            a) ONLY diagonal elements of the symmetric block diagonal */
/* >               matrix D on the diagonal of A, i.e. D(k,k) = A(k,k); */
/* >               (superdiagonal (or subdiagonal) elements of D */
/* >                are stored on exit in array E), and */
/* >            b) If UPLO = 'U': factor U in the superdiagonal part of A. */
/* >               If UPLO = 'L': factor L in the subdiagonal part of A. */
/* > \endverbatim */
/* > */
/* > \param[in] LDA */
/* > \verbatim */
/* >          LDA is INTEGER */
/* >          The leading dimension of the array A.  LDA >= f2cmax(1,N). */
/* > \endverbatim */
/* > */
/* > \param[out] E */
/* > \verbatim */
/* >          E is REAL array, dimension (N) */
/* >          On exit, contains the superdiagonal (or subdiagonal) */
/* >          elements of the symmetric block diagonal matrix D */
/* >          with 1-by-1 or 2-by-2 diagonal blocks, where */
/* >          If UPLO = 'U': E(i) = D(i-1,i), i=2:N, E(1) is set to 0; */
/* >          If UPLO = 'L': E(i) = D(i+1,i), i=1:N-1, E(N) is set to 0. */
/* > */
/* >          NOTE: For 1-by-1 diagonal block D(k), where */
/* >          1 <= k <= N, the element E(k) is set to 0 in both */
/* >          UPLO = 'U' or UPLO = 'L' cases. */
/* > \endverbatim */
/* > */
/* > \param[out] IPIV */
/* > \verbatim */
/* >          IPIV is INTEGER array, dimension (N) */
/* >          IPIV describes the permutation matrix P in the factorization */
/* >          of matrix A as follows. The absolute value of IPIV(k) */
/* >          represents the index of row and column that were */
/* >          interchanged with the k-th row and column. The value of UPLO */
/* >          describes the order in which the interchanges were applied. */
/* >          Also, the sign of IPIV represents the block structure of */
/* >          the symmetric block diagonal matrix D with 1-by-1 or 2-by-2 */
/* >          diagonal blocks which correspond to 1 or 2 interchanges */
/* >          at each factorization step. For more info see Further */
/* >          Details section. */
/* > */
/* >          If UPLO = 'U', */
/* >          ( in factorization order, k decreases from N to 1 ): */
/* >            a) A single positive entry IPIV(k) > 0 means: */
/* >               D(k,k) is a 1-by-1 diagonal block. */
/* >               If IPIV(k) != k, rows and columns k and IPIV(k) were */
/* >               interchanged in the matrix A(1:N,1:N); */
/* >               If IPIV(k) = k, no interchange occurred. */
/* > */
/* >            b) A pair of consecutive negative entries */
/* >               IPIV(k) < 0 and IPIV(k-1) < 0 means: */
/* >               D(k-1:k,k-1:k) is a 2-by-2 diagonal block. */
/* >               (NOTE: negative entries in IPIV appear ONLY in pairs). */
/* >               1) If -IPIV(k) != k, rows and columns */
/* >                  k and -IPIV(k) were interchanged */
/* >                  in the matrix A(1:N,1:N). */
/* >                  If -IPIV(k) = k, no interchange occurred. */
/* >               2) If -IPIV(k-1) != k-1, rows and columns */
/* >                  k-1 and -IPIV(k-1) were interchanged */
/* >                  in the matrix A(1:N,1:N). */
/* >                  If -IPIV(k-1) = k-1, no interchange occurred. */
/* > */
/* >            c) In both cases a) and b), always ABS( IPIV(k) ) <= k. */
/* > */
/* >            d) NOTE: Any entry IPIV(k) is always NONZERO on output. */
/* > */
/* >          If UPLO = 'L', */
/* >          ( in factorization order, k increases from 1 to N ): */
/* >            a) A single positive entry IPIV(k) > 0 means: */
/* >               D(k,k) is a 1-by-1 diagonal block. */
/* >               If IPIV(k) != k, rows and columns k and IPIV(k) were */
/* >               interchanged in the matrix A(1:N,1:N). */
/* >               If IPIV(k) = k, no interchange occurred. */
/* > */
/* >            b) A pair of consecutive negative entries */
/* >               IPIV(k) < 0 and IPIV(k+1) < 0 means: */
/* >               D(k:k+1,k:k+1) is a 2-by-2 diagonal block. */
/* >               (NOTE: negative entries in IPIV appear ONLY in pairs). */
/* >               1) If -IPIV(k) != k, rows and columns */
/* >                  k and -IPIV(k) were interchanged */
/* >                  in the matrix A(1:N,1:N). */
/* >                  If -IPIV(k) = k, no interchange occurred. */
/* >               2) If -IPIV(k+1) != k+1, rows and columns */
/* >                  k-1 and -IPIV(k-1) were interchanged */
/* >                  in the matrix A(1:N,1:N). */
/* >                  If -IPIV(k+1) = k+1, no interchange occurred. */
/* > */
/* >            c) In both cases a) and b), always ABS( IPIV(k) ) >= k. */
/* > */
/* >            d) NOTE: Any entry IPIV(k) is always NONZERO on output. */
/* > \endverbatim */
/* > */
/* > \param[out] WORK */
/* > \verbatim */
/* >          WORK is REAL array, dimension ( MAX(1,LWORK) ). */
/* >          On exit, if INFO = 0, WORK(1) returns the optimal LWORK. */
/* > \endverbatim */
/* > */
/* > \param[in] LWORK */
/* > \verbatim */
/* >          LWORK is INTEGER */
/* >          The length of WORK.  LWORK >=1.  For best performance */
/* >          LWORK >= N*NB, where NB is the block size returned */
/* >          by ILAENV. */
/* > */
/* >          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. */
/* > \endverbatim */
/* > */
/* > \param[out] INFO */
/* > \verbatim */
/* >          INFO is INTEGER */
/* >          = 0: successful exit */
/* > */
/* >          < 0: If INFO = -k, the k-th argument had an illegal value */
/* > */
/* >          > 0: If INFO = k, the matrix A is singular, because: */
/* >                 If UPLO = 'U': column k in the upper */
/* >                 triangular part of A contains all zeros. */
/* >                 If UPLO = 'L': column k in the lower */
/* >                 triangular part of A contains all zeros. */
/* > */
/* >               Therefore D(k,k) is exactly zero, and superdiagonal */
/* >               elements of column k of U (or subdiagonal elements of */
/* >               column k of L ) are all zeros. 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. */
/* > */
/* >               NOTE: INFO only stores the first occurrence of */
/* >               a singularity, any subsequent occurrence of singularity */
/* >               is not stored in INFO even though the factorization */
/* >               always completes. */
/* > \endverbatim */

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

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

/* > \date December 2016 */

/* > \ingroup singleSYcomputational */

/* > \par Further Details: */
/*  ===================== */
/* > */
/* > \verbatim */
/* > TODO: put correct description */
/* > \endverbatim */

/* > \par Contributors: */
/*  ================== */
/* > */
/* > \verbatim */
/* > */
/* >  December 2016,  Igor Kozachenko, */
/* >                  Computer Science Division, */
/* >                  University of California, Berkeley */
/* > */
/* >  September 2007, Sven Hammarling, Nicholas J. Higham, Craig Lucas, */
/* >                  School of Mathematics, */
/* >                  University of Manchester */
/* > */
/* > \endverbatim */

/*  ===================================================================== */
/* Subroutine */ int ssytrf_rk_(char *uplo, integer *n, real *a, integer *
	lda, real *e, integer *ipiv, real *work, integer *lwork, integer *
	info)
{
    /* System generated locals */
    integer a_dim1, a_offset, i__1, i__2;

    /* Local variables */
    integer i__, k;
    extern logical lsame_(char *, char *);
    integer nbmin, iinfo;
    extern /* Subroutine */ int ssytf2_rk_(char *, integer *, real *, 
	    integer *, real *, integer *, integer *);
    logical upper;
    extern /* Subroutine */ int sswap_(integer *, real *, integer *, real *, 
	    integer *), slasyf_rk_(char *, integer *, integer *, integer *, 
	    real *, integer *, real *, integer *, real *, integer *, integer *
	    );
    integer kb, nb, ip;
    extern /* Subroutine */ int xerbla_(char *, integer *, ftnlen);
    extern integer ilaenv_(integer *, char *, char *, integer *, integer *, 
	    integer *, integer *, ftnlen, ftnlen);
    integer ldwork, lwkopt;
    logical lquery;
    integer iws;


/*  -- LAPACK computational routine (version 3.7.0) -- */
/*  -- LAPACK is a software package provided by Univ. of Tennessee,    -- */
/*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- */
/*     December 2016 */


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


/*     Test the input parameters. */

    /* Parameter adjustments */
    a_dim1 = *lda;
    a_offset = 1 + a_dim1 * 1;
    a -= a_offset;
    --e;
    --ipiv;
    --work;

    /* Function Body */
    *info = 0;
    upper = lsame_(uplo, "U");
    lquery = *lwork == -1;
    if (! upper && ! lsame_(uplo, "L")) {
	*info = -1;
    } else if (*n < 0) {
	*info = -2;
    } else if (*lda < f2cmax(1,*n)) {
	*info = -4;
    } else if (*lwork < 1 && ! lquery) {
	*info = -8;
    }

    if (*info == 0) {

/*        Determine the block size */

	nb = ilaenv_(&c__1, "SSYTRF_RK", uplo, n, &c_n1, &c_n1, &c_n1, (
		ftnlen)9, (ftnlen)1);
	lwkopt = *n * nb;
	work[1] = (real) lwkopt;
    }

    if (*info != 0) {
	i__1 = -(*info);
	xerbla_("SSYTRF_RK", &i__1, (ftnlen)9);
	return 0;
    } else if (lquery) {
	return 0;
    }

    nbmin = 2;
    ldwork = *n;
    if (nb > 1 && nb < *n) {
	iws = ldwork * nb;
	if (*lwork < iws) {
/* Computing MAX */
	    i__1 = *lwork / ldwork;
	    nb = f2cmax(i__1,1);
/* Computing MAX */
	    i__1 = 2, i__2 = ilaenv_(&c__2, "SSYTRF_RK", uplo, n, &c_n1, &
		    c_n1, &c_n1, (ftnlen)9, (ftnlen)1);
	    nbmin = f2cmax(i__1,i__2);
	}
    } else {
	iws = 1;
    }
    if (nb < nbmin) {
	nb = *n;
    }

    if (upper) {

/*        Factorize A as U*D*U**T using the upper triangle of A */

/*        K is the main loop index, decreasing from N to 1 in steps of */
/*        KB, where KB is the number of columns factorized by SLASYF_RK; */
/*        KB is either NB or NB-1, or K for the last block */

	k = *n;
L10:

/*        If K < 1, exit from loop */

	if (k < 1) {
	    goto L15;
	}

	if (k > nb) {

/*           Factorize columns k-kb+1:k of A and use blocked code to */
/*           update columns 1:k-kb */

	    slasyf_rk_(uplo, &k, &nb, &kb, &a[a_offset], lda, &e[1], &ipiv[1]
		    , &work[1], &ldwork, &iinfo);
	} else {

/*           Use unblocked code to factorize columns 1:k of A */

	    ssytf2_rk_(uplo, &k, &a[a_offset], lda, &e[1], &ipiv[1], &iinfo);
	    kb = k;
	}

/*        Set INFO on the first occurrence of a zero pivot */

	if (*info == 0 && iinfo > 0) {
	    *info = iinfo;
	}

/*        No need to adjust IPIV */


/*        Apply permutations to the leading panel 1:k-1 */

/*        Read IPIV from the last block factored, i.e. */
/*        indices  k-kb+1:k and apply row permutations to the */
/*        last k+1 colunms k+1:N after that block */
/*        (We can do the simple loop over IPIV with decrement -1, */
/*        since the ABS value of IPIV( I ) represents the row index */
/*        of the interchange with row i in both 1x1 and 2x2 pivot cases) */

	if (k < *n) {
	    i__1 = k - kb + 1;
	    for (i__ = k; i__ >= i__1; --i__) {
		ip = (i__2 = ipiv[i__], abs(i__2));
		if (ip != i__) {
		    i__2 = *n - k;
		    sswap_(&i__2, &a[i__ + (k + 1) * a_dim1], lda, &a[ip + (k 
			    + 1) * a_dim1], lda);
		}
	    }
	}

/*        Decrease K and return to the start of the main loop */

	k -= kb;
	goto L10;

/*        This label is the exit from main loop over K decreasing */
/*        from N to 1 in steps of KB */

L15:

	;
    } else {

/*        Factorize A as L*D*L**T using the lower triangle of A */

/*        K is the main loop index, increasing from 1 to N in steps of */
/*        KB, where KB is the number of columns factorized by SLASYF_RK; */
/*        KB is either NB or NB-1, or N-K+1 for the last block */

	k = 1;
L20:

/*        If K > N, exit from loop */

	if (k > *n) {
	    goto L35;
	}

	if (k <= *n - nb) {

/*           Factorize columns k:k+kb-1 of A and use blocked code to */
/*           update columns k+kb:n */

	    i__1 = *n - k + 1;
	    slasyf_rk_(uplo, &i__1, &nb, &kb, &a[k + k * a_dim1], lda, &e[k],
		     &ipiv[k], &work[1], &ldwork, &iinfo);
	} else {

/*           Use unblocked code to factorize columns k:n of A */

	    i__1 = *n - k + 1;
	    ssytf2_rk_(uplo, &i__1, &a[k + k * a_dim1], lda, &e[k], &ipiv[k],
		     &iinfo);
	    kb = *n - k + 1;

	}

/*        Set INFO on the first occurrence of a zero pivot */

	if (*info == 0 && iinfo > 0) {
	    *info = iinfo + k - 1;
	}

/*        Adjust IPIV */

	i__1 = k + kb - 1;
	for (i__ = k; i__ <= i__1; ++i__) {
	    if (ipiv[i__] > 0) {
		ipiv[i__] = ipiv[i__] + k - 1;
	    } else {
		ipiv[i__] = ipiv[i__] - k + 1;
	    }
	}

/*        Apply permutations to the leading panel 1:k-1 */

/*        Read IPIV from the last block factored, i.e. */
/*        indices  k:k+kb-1 and apply row permutations to the */
/*        first k-1 colunms 1:k-1 before that block */
/*        (We can do the simple loop over IPIV with increment 1, */
/*        since the ABS value of IPIV( I ) represents the row index */
/*        of the interchange with row i in both 1x1 and 2x2 pivot cases) */

	if (k > 1) {
	    i__1 = k + kb - 1;
	    for (i__ = k; i__ <= i__1; ++i__) {
		ip = (i__2 = ipiv[i__], abs(i__2));
		if (ip != i__) {
		    i__2 = k - 1;
		    sswap_(&i__2, &a[i__ + a_dim1], lda, &a[ip + a_dim1], lda)
			    ;
		}
	    }
	}

/*        Increase K and return to the start of the main loop */

	k += kb;
	goto L20;

/*        This label is the exit from main loop over K increasing */
/*        from 1 to N in steps of KB */

L35:

/*     End Lower */

	;
    }

    work[1] = (real) lwkopt;
    return 0;

/*     End of SSYTRF_RK */

} /* ssytrf_rk__ */