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

/* Subroutine */ int zsyrk_(char *uplo, char *trans, integer *n, integer *k, 
	doublecomplex *alpha, doublecomplex *a, integer *lda, doublecomplex *
	beta, doublecomplex *c__, integer *ldc)
{
    /* System generated locals */
    integer a_dim1, a_offset, c_dim1, c_offset, i__1, i__2, i__3, i__4, i__5, 
	    i__6;
    doublecomplex z__1, z__2, z__3;
    /* Local variables */
    static integer info;
    static doublecomplex temp;
    static integer i__, j, l;
    extern logical lsame_(char *, char *);
    static integer nrowa;
    static logical upper;
    extern /* Subroutine */ int xerbla_(char *, integer *);
#define a_subscr(a_1,a_2) (a_2)*a_dim1 + a_1
#define a_ref(a_1,a_2) a[a_subscr(a_1,a_2)]
#define c___subscr(a_1,a_2) (a_2)*c_dim1 + a_1
#define c___ref(a_1,a_2) c__[c___subscr(a_1,a_2)]
/*  Purpose   
    =======   
    ZSYRK  performs one of the symmetric rank k operations   
       C := alpha*A*A' + beta*C,   
    or   
       C := alpha*A'*A + beta*C,   
    where  alpha and beta  are scalars,  C is an  n by n symmetric matrix   
    and  A  is an  n by k  matrix in the first case and a  k by n  matrix   
    in the second case.   
    Parameters   
    ==========   
    UPLO   - CHARACTER*1.   
             On  entry,   UPLO  specifies  whether  the  upper  or  lower   
             triangular  part  of the  array  C  is to be  referenced  as   
             follows:   
                UPLO = 'U' or 'u'   Only the  upper triangular part of  C   
                                    is to be referenced.   
                UPLO = 'L' or 'l'   Only the  lower triangular part of  C   
                                    is to be referenced.   
             Unchanged on exit.   
    TRANS  - CHARACTER*1.   
             On entry,  TRANS  specifies the operation to be performed as   
             follows:   
                TRANS = 'N' or 'n'   C := alpha*A*A' + beta*C.   
                TRANS = 'T' or 't'   C := alpha*A'*A + beta*C.   
             Unchanged on exit.   
    N      - INTEGER.   
             On entry,  N specifies the order of the matrix C.  N must be   
             at least zero.   
             Unchanged on exit.   
    K      - INTEGER.   
             On entry with  TRANS = 'N' or 'n',  K  specifies  the number   
             of  columns   of  the   matrix   A,   and  on   entry   with   
             TRANS = 'T' or 't',  K  specifies  the number of rows of the   
             matrix A.  K must be at least zero.   
             Unchanged on exit.   
    ALPHA  - COMPLEX*16      .   
             On entry, ALPHA specifies the scalar alpha.   
             Unchanged on exit.   
    A      - COMPLEX*16       array of DIMENSION ( LDA, ka ), where ka is   
             k  when  TRANS = 'N' or 'n',  and is  n  otherwise.   
             Before entry with  TRANS = 'N' or 'n',  the  leading  n by k   
             part of the array  A  must contain the matrix  A,  otherwise   
             the leading  k by n  part of the array  A  must contain  the   
             matrix A.   
             Unchanged on exit.   
    LDA    - INTEGER.   
             On entry, LDA specifies the first dimension of A as declared   
             in  the  calling  (sub)  program.   When  TRANS = 'N' or 'n'   
             then  LDA must be at least  max( 1, n ), otherwise  LDA must   
             be at least  max( 1, k ).   
             Unchanged on exit.   
    BETA   - COMPLEX*16      .   
             On entry, BETA specifies the scalar beta.   
             Unchanged on exit.   
    C      - COMPLEX*16       array of DIMENSION ( LDC, n ).   
             Before entry  with  UPLO = 'U' or 'u',  the leading  n by n   
             upper triangular part of the array C must contain the upper   
             triangular part  of the  symmetric matrix  and the strictly   
             lower triangular part of C is not referenced.  On exit, the   
             upper triangular part of the array  C is overwritten by the   
             upper triangular part of the updated matrix.   
             Before entry  with  UPLO = 'L' or 'l',  the leading  n by n   
             lower triangular part of the array C must contain the lower   
             triangular part  of the  symmetric matrix  and the strictly   
             upper triangular part of C is not referenced.  On exit, the   
             lower triangular part of the array  C is overwritten by the   
             lower triangular part of the updated matrix.   
    LDC    - INTEGER.   
             On entry, LDC specifies the first dimension of C as declared   
             in  the  calling  (sub)  program.   LDC  must  be  at  least   
             max( 1, n ).   
             Unchanged on exit.   
    Level 3 Blas routine.   
    -- Written on 8-February-1989.   
       Jack Dongarra, Argonne National Laboratory.   
       Iain Duff, AERE Harwell.   
       Jeremy Du Croz, Numerical Algorithms Group Ltd.   
       Sven Hammarling, Numerical Algorithms Group Ltd.   
       Test the input parameters.   
       Parameter adjustments */
    a_dim1 = *lda;
    a_offset = 1 + a_dim1 * 1;
    a -= a_offset;
    c_dim1 = *ldc;
    c_offset = 1 + c_dim1 * 1;
    c__ -= c_offset;
    /* Function Body */
    if (lsame_(trans, "N")) {
	nrowa = *n;
    } else {
	nrowa = *k;
    }
    upper = lsame_(uplo, "U");
    info = 0;
    if (! upper && ! lsame_(uplo, "L")) {
	info = 1;
    } else if (! lsame_(trans, "N") && ! lsame_(trans, 
	    "T")) {
	info = 2;
    } else if (*n < 0) {
	info = 3;
    } else if (*k < 0) {
	info = 4;
    } else if (*lda < max(1,nrowa)) {
	info = 7;
    } else if (*ldc < max(1,*n)) {
	info = 10;
    }
    if (info != 0) {
	xerbla_("ZSYRK ", &info);
	return 0;
    }
/*     Quick return if possible. */
    if (*n == 0 || (alpha->r == 0. && alpha->i == 0. || *k == 0) && (beta->r 
	    == 1. && beta->i == 0.)) {
	return 0;
    }
/*     And when  alpha.eq.zero. */
    if (alpha->r == 0. && alpha->i == 0.) {
	if (upper) {
	    if (beta->r == 0. && beta->i == 0.) {
		i__1 = *n;
		for (j = 1; j <= i__1; ++j) {
		    i__2 = j;
		    for (i__ = 1; i__ <= i__2; ++i__) {
			i__3 = c___subscr(i__, j);
			c__[i__3].r = 0., c__[i__3].i = 0.;
/* L10: */
		    }
/* L20: */
		}
	    } else {
		i__1 = *n;
		for (j = 1; j <= i__1; ++j) {
		    i__2 = j;
		    for (i__ = 1; i__ <= i__2; ++i__) {
			i__3 = c___subscr(i__, j);
			i__4 = c___subscr(i__, j);
			z__1.r = beta->r * c__[i__4].r - beta->i * c__[i__4]
				.i, z__1.i = beta->r * c__[i__4].i + beta->i *
				 c__[i__4].r;
			c__[i__3].r = z__1.r, c__[i__3].i = z__1.i;
/* L30: */
		    }
/* L40: */
		}
	    }
	} else {
	    if (beta->r == 0. && beta->i == 0.) {
		i__1 = *n;
		for (j = 1; j <= i__1; ++j) {
		    i__2 = *n;
		    for (i__ = j; i__ <= i__2; ++i__) {
			i__3 = c___subscr(i__, j);
			c__[i__3].r = 0., c__[i__3].i = 0.;
/* L50: */
		    }
/* L60: */
		}
	    } else {
		i__1 = *n;
		for (j = 1; j <= i__1; ++j) {
		    i__2 = *n;
		    for (i__ = j; i__ <= i__2; ++i__) {
			i__3 = c___subscr(i__, j);
			i__4 = c___subscr(i__, j);
			z__1.r = beta->r * c__[i__4].r - beta->i * c__[i__4]
				.i, z__1.i = beta->r * c__[i__4].i + beta->i *
				 c__[i__4].r;
			c__[i__3].r = z__1.r, c__[i__3].i = z__1.i;
/* L70: */
		    }
/* L80: */
		}
	    }
	}
	return 0;
    }
/*     Start the operations. */
    if (lsame_(trans, "N")) {
/*        Form  C := alpha*A*A' + beta*C. */
	if (upper) {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		if (beta->r == 0. && beta->i == 0.) {
		    i__2 = j;
		    for (i__ = 1; i__ <= i__2; ++i__) {
			i__3 = c___subscr(i__, j);
			c__[i__3].r = 0., c__[i__3].i = 0.;
/* L90: */
		    }
		} else if (beta->r != 1. || beta->i != 0.) {
		    i__2 = j;
		    for (i__ = 1; i__ <= i__2; ++i__) {
			i__3 = c___subscr(i__, j);
			i__4 = c___subscr(i__, j);
			z__1.r = beta->r * c__[i__4].r - beta->i * c__[i__4]
				.i, z__1.i = beta->r * c__[i__4].i + beta->i *
				 c__[i__4].r;
			c__[i__3].r = z__1.r, c__[i__3].i = z__1.i;
/* L100: */
		    }
		}
		i__2 = *k;
		for (l = 1; l <= i__2; ++l) {
		    i__3 = a_subscr(j, l);
		    if (a[i__3].r != 0. || a[i__3].i != 0.) {
			i__3 = a_subscr(j, l);
			z__1.r = alpha->r * a[i__3].r - alpha->i * a[i__3].i, 
				z__1.i = alpha->r * a[i__3].i + alpha->i * a[
				i__3].r;
			temp.r = z__1.r, temp.i = z__1.i;
			i__3 = j;
			for (i__ = 1; i__ <= i__3; ++i__) {
			    i__4 = c___subscr(i__, j);
			    i__5 = c___subscr(i__, j);
			    i__6 = a_subscr(i__, l);
			    z__2.r = temp.r * a[i__6].r - temp.i * a[i__6].i, 
				    z__2.i = temp.r * a[i__6].i + temp.i * a[
				    i__6].r;
			    z__1.r = c__[i__5].r + z__2.r, z__1.i = c__[i__5]
				    .i + z__2.i;
			    c__[i__4].r = z__1.r, c__[i__4].i = z__1.i;
/* L110: */
			}
		    }
/* L120: */
		}
/* L130: */
	    }
	} else {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		if (beta->r == 0. && beta->i == 0.) {
		    i__2 = *n;
		    for (i__ = j; i__ <= i__2; ++i__) {
			i__3 = c___subscr(i__, j);
			c__[i__3].r = 0., c__[i__3].i = 0.;
/* L140: */
		    }
		} else if (beta->r != 1. || beta->i != 0.) {
		    i__2 = *n;
		    for (i__ = j; i__ <= i__2; ++i__) {
			i__3 = c___subscr(i__, j);
			i__4 = c___subscr(i__, j);
			z__1.r = beta->r * c__[i__4].r - beta->i * c__[i__4]
				.i, z__1.i = beta->r * c__[i__4].i + beta->i *
				 c__[i__4].r;
			c__[i__3].r = z__1.r, c__[i__3].i = z__1.i;
/* L150: */
		    }
		}
		i__2 = *k;
		for (l = 1; l <= i__2; ++l) {
		    i__3 = a_subscr(j, l);
		    if (a[i__3].r != 0. || a[i__3].i != 0.) {
			i__3 = a_subscr(j, l);
			z__1.r = alpha->r * a[i__3].r - alpha->i * a[i__3].i, 
				z__1.i = alpha->r * a[i__3].i + alpha->i * a[
				i__3].r;
			temp.r = z__1.r, temp.i = z__1.i;
			i__3 = *n;
			for (i__ = j; i__ <= i__3; ++i__) {
			    i__4 = c___subscr(i__, j);
			    i__5 = c___subscr(i__, j);
			    i__6 = a_subscr(i__, l);
			    z__2.r = temp.r * a[i__6].r - temp.i * a[i__6].i, 
				    z__2.i = temp.r * a[i__6].i + temp.i * a[
				    i__6].r;
			    z__1.r = c__[i__5].r + z__2.r, z__1.i = c__[i__5]
				    .i + z__2.i;
			    c__[i__4].r = z__1.r, c__[i__4].i = z__1.i;
/* L160: */
			}
		    }
/* L170: */
		}
/* L180: */
	    }
	}
    } else {
/*        Form  C := alpha*A'*A + beta*C. */
	if (upper) {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		i__2 = j;
		for (i__ = 1; i__ <= i__2; ++i__) {
		    temp.r = 0., temp.i = 0.;
		    i__3 = *k;
		    for (l = 1; l <= i__3; ++l) {
			i__4 = a_subscr(l, i__);
			i__5 = a_subscr(l, j);
			z__2.r = a[i__4].r * a[i__5].r - a[i__4].i * a[i__5]
				.i, z__2.i = a[i__4].r * a[i__5].i + a[i__4]
				.i * a[i__5].r;
			z__1.r = temp.r + z__2.r, z__1.i = temp.i + z__2.i;
			temp.r = z__1.r, temp.i = z__1.i;
/* L190: */
		    }
		    if (beta->r == 0. && beta->i == 0.) {
			i__3 = c___subscr(i__, j);
			z__1.r = alpha->r * temp.r - alpha->i * temp.i, 
				z__1.i = alpha->r * temp.i + alpha->i * 
				temp.r;
			c__[i__3].r = z__1.r, c__[i__3].i = z__1.i;
		    } else {
			i__3 = c___subscr(i__, j);
			z__2.r = alpha->r * temp.r - alpha->i * temp.i, 
				z__2.i = alpha->r * temp.i + alpha->i * 
				temp.r;
			i__4 = c___subscr(i__, j);
			z__3.r = beta->r * c__[i__4].r - beta->i * c__[i__4]
				.i, z__3.i = beta->r * c__[i__4].i + beta->i *
				 c__[i__4].r;
			z__1.r = z__2.r + z__3.r, z__1.i = z__2.i + z__3.i;
			c__[i__3].r = z__1.r, c__[i__3].i = z__1.i;
		    }
/* L200: */
		}
/* L210: */
	    }
	} else {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		i__2 = *n;
		for (i__ = j; i__ <= i__2; ++i__) {
		    temp.r = 0., temp.i = 0.;
		    i__3 = *k;
		    for (l = 1; l <= i__3; ++l) {
			i__4 = a_subscr(l, i__);
			i__5 = a_subscr(l, j);
			z__2.r = a[i__4].r * a[i__5].r - a[i__4].i * a[i__5]
				.i, z__2.i = a[i__4].r * a[i__5].i + a[i__4]
				.i * a[i__5].r;
			z__1.r = temp.r + z__2.r, z__1.i = temp.i + z__2.i;
			temp.r = z__1.r, temp.i = z__1.i;
/* L220: */
		    }
		    if (beta->r == 0. && beta->i == 0.) {
			i__3 = c___subscr(i__, j);
			z__1.r = alpha->r * temp.r - alpha->i * temp.i, 
				z__1.i = alpha->r * temp.i + alpha->i * 
				temp.r;
			c__[i__3].r = z__1.r, c__[i__3].i = z__1.i;
		    } else {
			i__3 = c___subscr(i__, j);
			z__2.r = alpha->r * temp.r - alpha->i * temp.i, 
				z__2.i = alpha->r * temp.i + alpha->i * 
				temp.r;
			i__4 = c___subscr(i__, j);
			z__3.r = beta->r * c__[i__4].r - beta->i * c__[i__4]
				.i, z__3.i = beta->r * c__[i__4].i + beta->i *
				 c__[i__4].r;
			z__1.r = z__2.r + z__3.r, z__1.i = z__2.i + z__3.i;
			c__[i__3].r = z__1.r, c__[i__3].i = z__1.i;
		    }
/* L230: */
		}
/* L240: */
	    }
	}
    }
    return 0;
/*     End of ZSYRK . */
} /* zsyrk_ */
#undef c___ref
#undef c___subscr
#undef a_ref
#undef a_subscr

