text: /* cher2.f -- translated by f2c (version 19991025). You must link the resulting object file with the libraries: -lf2c -lm (in that order) */
  #include "FLA_f2c.h"
  /* Subroutine */
  int cher2_(char *uplo, integer *n, complex *alpha, complex * x, integer *incx, complex *y, integer *incy, complex *a, integer *lda)
  {
      /* System generated locals */
      integer a_dim1, a_offset, i__1, i__2, i__3, i__4, i__5, i__6;
      real r__1;
      complex q__1, q__2, q__3, q__4;
      /* Builtin functions */
      void r_cnjg(complex *, complex *);
      /* Local variables */
      integer info;
      complex temp1, temp2;
      integer i__, j;
      extern logical lsame_(char *, char *);
      integer ix, iy, jx, jy, kx, ky;
      extern /* Subroutine */
      int xerbla_(char *, integer *);
      /* .. Scalar Arguments .. */
      /* .. Array Arguments .. */
      /* .. */
      /* Purpose */
      /* ======= */
      /* CHER2 performs the hermitian rank 2 operation */
      /* A := alpha*x*conjg( y' ) + conjg( alpha )*y*conjg( x' ) + A, */
      /* where alpha is a scalar, x and y are n element vectors and A is an n */
      /* by n hermitian matrix. */
      /* Parameters */
      /* ========== */
      /* UPLO - CHARACTER*1. */
      /* On entry, UPLO specifies whether the upper or lower */
      /* triangular part of the array A is to be referenced as */
      /* follows: */
      /* UPLO = 'U' or 'u' Only the upper triangular part of A */
      /* is to be referenced. */
      /* UPLO = 'L' or 'l' Only the lower triangular part of A */
      /* is to be referenced. */
      /* Unchanged on exit. */
      /* N - INTEGER. */
      /* On entry, N specifies the order of the matrix A. */
      /* N must be at least zero. */
      /* Unchanged on exit. */
      /* ALPHA - COMPLEX . */
      /* On entry, ALPHA specifies the scalar alpha. */
      /* Unchanged on exit. */
      /* X - COMPLEX array of dimension at least */
      /* ( 1 + ( n - 1 )*f2c_abs( INCX ) ). */
      /* Before entry, the incremented array X must contain the n */
      /* element vector x. */
      /* Unchanged on exit. */
      /* INCX - INTEGER. */
      /* On entry, INCX specifies the increment for the elements of */
      /* X. INCX must not be zero. */
      /* Unchanged on exit. */
      /* Y - COMPLEX array of dimension at least */
      /* ( 1 + ( n - 1 )*f2c_abs( INCY ) ). */
      /* Before entry, the incremented array Y must contain the n */
      /* element vector y. */
      /* Unchanged on exit. */
      /* INCY - INTEGER. */
      /* On entry, INCY specifies the increment for the elements of */
      /* Y. INCY must not be zero. */
      /* Unchanged on exit. */
      /* A - COMPLEX array of DIMENSION ( LDA, n ). */
      /* Before entry with UPLO = 'U' or 'u', the leading n by n */
      /* upper triangular part of the array A must contain the upper */
      /* triangular part of the hermitian matrix and the strictly */
      /* lower triangular part of A is not referenced. On exit, the */
      /* upper triangular part of the array A 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 A must contain the lower */
      /* triangular part of the hermitian matrix and the strictly */
      /* upper triangular part of A is not referenced. On exit, the */
      /* lower triangular part of the array A is overwritten by the */
      /* lower triangular part of the updated matrix. */
      /* Note that the imaginary parts of the diagonal elements need */
      /* not be set, they are assumed to be zero, and on exit they */
      /* are set to zero. */
      /* LDA - INTEGER. */
      /* On entry, LDA specifies the first dimension of A as declared */
      /* in the calling (sub) program. LDA must be at least */
      /* max( 1, n ). */
      /* Unchanged on exit. */
      /* Level 2 Blas routine. */
      /* -- Written on 22-October-1986. */
      /* Jack Dongarra, Argonne National Lab. */
      /* Jeremy Du Croz, Nag Central Office. */
      /* Sven Hammarling, Nag Central Office. */
      /* Richard Hanson, Sandia National Labs. */
      /* .. Parameters .. */
      /* .. Local Scalars .. */
      /* .. External Functions .. */
      /* .. External Subroutines .. */
      /* .. Intrinsic Functions .. */
      /* .. */
      /* .. Executable Statements .. */
      /* Test the input parameters. */
      /* Parameter adjustments */
      --x;
      --y;
      a_dim1 = *lda;
      a_offset = 1 + a_dim1 * 1;
      a -= a_offset;
      /* Function Body */
      info = 0;
      if (! lsame_(uplo, "U") && ! lsame_(uplo, "L"))
      {
          info = 1;
      }
      else if (*n < 0)
      {
          info = 2;
      }
      else if (*incx == 0)
      {
          info = 5;
      }
      else if (*incy == 0)
      {
          info = 7;
      }
      else if (*lda < max(1,*n))
      {
          info = 9;
      }
      if (info != 0)
      {
          xerbla_("CHER2 ", &info);
          return 0;
      }
      /* Quick return if possible. */
      if (*n == 0 || alpha->r == 0.f && alpha->i == 0.f)
      {
          return 0;
      }
      /* Set up the start points in X and Y if the increments are not both */
      /* unity. */
      if (*incx != 1 || *incy != 1)
      {
          if (*incx > 0)
          {
              kx = 1;
          }
          else
          {
              kx = 1 - (*n - 1) * *incx;
          }
          if (*incy > 0)
          {
              ky = 1;
          }
          else
          {
              ky = 1 - (*n - 1) * *incy;
          }
          jx = kx;
          jy = ky;
      }
      /* Start the operations. In this version the elements of A are */
      /* accessed sequentially with one pass through the triangular part */
      /* of A. */
      if (lsame_(uplo, "U"))
      {
          /* Form A when A is stored in the upper triangle. */
          if (*incx == 1 && *incy == 1)
          {
              i__1 = *n;
              for (j = 1;
                      j <= i__1;
                      ++j)
              {
                  i__2 = j;
                  i__3 = j;
                  if (x[i__2].r != 0.f || x[i__2].i != 0.f || (y[i__3].r != 0.f || y[i__3].i != 0.f))
                  {
                      r_cnjg(&q__2, &y[j]);
                      q__1.r = alpha->r * q__2.r - alpha->i * q__2.i, q__1.i = alpha->r * q__2.i + alpha->i * q__2.r;
                      temp1.r = q__1.r, temp1.i = q__1.i;
                      i__2 = j;
                      q__2.r = alpha->r * x[i__2].r - alpha->i * x[i__2].i, q__2.i = alpha->r * x[i__2].i + alpha->i * x[i__2] .r;
                      r_cnjg(&q__1, &q__2);
                      temp2.r = q__1.r, temp2.i = q__1.i;
                      i__2 = j - 1;
                      for (i__ = 1;
                              i__ <= i__2;
                              ++i__)
                      {
                          i__3 = i__ + j * a_dim1;
                          i__4 = i__ + j * a_dim1;
                          i__5 = i__;
                          q__3.r = x[i__5].r * temp1.r - x[i__5].i * temp1.i, q__3.i = x[i__5].r * temp1.i + x[i__5].i * temp1.r;
                          q__2.r = a[i__4].r + q__3.r, q__2.i = a[i__4].i + q__3.i;
                          i__6 = i__;
                          q__4.r = y[i__6].r * temp2.r - y[i__6].i * temp2.i, q__4.i = y[i__6].r * temp2.i + y[i__6].i * temp2.r;
                          q__1.r = q__2.r + q__4.r, q__1.i = q__2.i + q__4.i;
                          a[i__3].r = q__1.r, a[i__3].i = q__1.i;
                          /* L10: */
                      }
                      i__2 = j + j * a_dim1;
                      i__3 = j + j * a_dim1;
                      i__4 = j;
                      q__2.r = x[i__4].r * temp1.r - x[i__4].i * temp1.i, q__2.i = x[i__4].r * temp1.i + x[i__4].i * temp1.r;
                      i__5 = j;
                      q__3.r = y[i__5].r * temp2.r - y[i__5].i * temp2.i, q__3.i = y[i__5].r * temp2.i + y[i__5].i * temp2.r;
                      q__1.r = q__2.r + q__3.r, q__1.i = q__2.i + q__3.i;
                      r__1 = a[i__3].r + q__1.r;
                      a[i__2].r = r__1, a[i__2].i = 0.f;
                  }
                  else
                  {
                      i__2 = j + j * a_dim1;
                      i__3 = j + j * a_dim1;
                      r__1 = a[i__3].r;
                      a[i__2].r = r__1, a[i__2].i = 0.f;
                  }
                  /* L20: */
              }
          }
          else
          {
              i__1 = *n;
              for (j = 1;
                      j <= i__1;
                      ++j)
              {
                  i__2 = jx;
                  i__3 = jy;
                  if (x[i__2].r != 0.f || x[i__2].i != 0.f || (y[i__3].r != 0.f || y[i__3].i != 0.f))
                  {
                      r_cnjg(&q__2, &y[jy]);
                      q__1.r = alpha->r * q__2.r - alpha->i * q__2.i, q__1.i = alpha->r * q__2.i + alpha->i * q__2.r;
                      temp1.r = q__1.r, temp1.i = q__1.i;
                      i__2 = jx;
                      q__2.r = alpha->r * x[i__2].r - alpha->i * x[i__2].i, q__2.i = alpha->r * x[i__2].i + alpha->i * x[i__2] .r;
                      r_cnjg(&q__1, &q__2);
                      temp2.r = q__1.r, temp2.i = q__1.i;
                      ix = kx;
                      iy = ky;
                      i__2 = j - 1;
                      for (i__ = 1;
                              i__ <= i__2;
                              ++i__)
                      {
                          i__3 = i__ + j * a_dim1;
                          i__4 = i__ + j * a_dim1;
                          i__5 = ix;
                          q__3.r = x[i__5].r * temp1.r - x[i__5].i * temp1.i, q__3.i = x[i__5].r * temp1.i + x[i__5].i * temp1.r;
                          q__2.r = a[i__4].r + q__3.r, q__2.i = a[i__4].i + q__3.i;
                          i__6 = iy;
                          q__4.r = y[i__6].r * temp2.r - y[i__6].i * temp2.i, q__4.i = y[i__6].r * temp2.i + y[i__6].i * temp2.r;
                          q__1.r = q__2.r + q__4.r, q__1.i = q__2.i + q__4.i;
                          a[i__3].r = q__1.r, a[i__3].i = q__1.i;
                          ix += *incx;
                          iy += *incy;
                          /* L30: */
                      }
                      i__2 = j + j * a_dim1;
                      i__3 = j + j * a_dim1;
                      i__4 = jx;
                      q__2.r = x[i__4].r * temp1.r - x[i__4].i * temp1.i, q__2.i = x[i__4].r * temp1.i + x[i__4].i * temp1.r;
                      i__5 = jy;
                      q__3.r = y[i__5].r * temp2.r - y[i__5].i * temp2.i, q__3.i = y[i__5].r * temp2.i + y[i__5].i * temp2.r;
                      q__1.r = q__2.r + q__3.r, q__1.i = q__2.i + q__3.i;
                      r__1 = a[i__3].r + q__1.r;
                      a[i__2].r = r__1, a[i__2].i = 0.f;
                  }
                  else
                  {
                      i__2 = j + j * a_dim1;
                      i__3 = j + j * a_dim1;
                      r__1 = a[i__3].r;
                      a[i__2].r = r__1, a[i__2].i = 0.f;
                  }
                  jx += *incx;
                  jy += *incy;
                  /* L40: */
              }
          }
      }
      else
      {
          /* Form A when A is stored in the lower triangle. */
          if (*incx == 1 && *incy == 1)
          {
              i__1 = *n;
              for (j = 1;
                      j <= i__1;
                      ++j)
              {
                  i__2 = j;
                  i__3 = j;
                  if (x[i__2].r != 0.f || x[i__2].i != 0.f || (y[i__3].r != 0.f || y[i__3].i != 0.f))
                  {
                      r_cnjg(&q__2, &y[j]);
                      q__1.r = alpha->r * q__2.r - alpha->i * q__2.i, q__1.i = alpha->r * q__2.i + alpha->i * q__2.r;
                      temp1.r = q__1.r, temp1.i = q__1.i;
                      i__2 = j;
                      q__2.r = alpha->r * x[i__2].r - alpha->i * x[i__2].i, q__2.i = alpha->r * x[i__2].i + alpha->i * x[i__2] .r;
                      r_cnjg(&q__1, &q__2);
                      temp2.r = q__1.r, temp2.i = q__1.i;
                      i__2 = j + j * a_dim1;
                      i__3 = j + j * a_dim1;
                      i__4 = j;
                      q__2.r = x[i__4].r * temp1.r - x[i__4].i * temp1.i, q__2.i = x[i__4].r * temp1.i + x[i__4].i * temp1.r;
                      i__5 = j;
                      q__3.r = y[i__5].r * temp2.r - y[i__5].i * temp2.i, q__3.i = y[i__5].r * temp2.i + y[i__5].i * temp2.r;
                      q__1.r = q__2.r + q__3.r, q__1.i = q__2.i + q__3.i;
                      r__1 = a[i__3].r + q__1.r;
                      a[i__2].r = r__1, a[i__2].i = 0.f;
                      i__2 = *n;
                      for (i__ = j + 1;
                              i__ <= i__2;
                              ++i__)
                      {
                          i__3 = i__ + j * a_dim1;
                          i__4 = i__ + j * a_dim1;
                          i__5 = i__;
                          q__3.r = x[i__5].r * temp1.r - x[i__5].i * temp1.i, q__3.i = x[i__5].r * temp1.i + x[i__5].i * temp1.r;
                          q__2.r = a[i__4].r + q__3.r, q__2.i = a[i__4].i + q__3.i;
                          i__6 = i__;
                          q__4.r = y[i__6].r * temp2.r - y[i__6].i * temp2.i, q__4.i = y[i__6].r * temp2.i + y[i__6].i * temp2.r;
                          q__1.r = q__2.r + q__4.r, q__1.i = q__2.i + q__4.i;
                          a[i__3].r = q__1.r, a[i__3].i = q__1.i;
                          /* L50: */
                      }
                  }
                  else
                  {
                      i__2 = j + j * a_dim1;
                      i__3 = j + j * a_dim1;
                      r__1 = a[i__3].r;
                      a[i__2].r = r__1, a[i__2].i = 0.f;
                  }
                  /* L60: */
              }
          }
          else
          {
              i__1 = *n;
              for (j = 1;
                      j <= i__1;
                      ++j)
              {
                  i__2 = jx;
                  i__3 = jy;
                  if (x[i__2].r != 0.f || x[i__2].i != 0.f || (y[i__3].r != 0.f || y[i__3].i != 0.f))
                  {
                      r_cnjg(&q__2, &y[jy]);
                      q__1.r = alpha->r * q__2.r - alpha->i * q__2.i, q__1.i = alpha->r * q__2.i + alpha->i * q__2.r;
                      temp1.r = q__1.r, temp1.i = q__1.i;
                      i__2 = jx;
                      q__2.r = alpha->r * x[i__2].r - alpha->i * x[i__2].i, q__2.i = alpha->r * x[i__2].i + alpha->i * x[i__2] .r;
                      r_cnjg(&q__1, &q__2);
                      temp2.r = q__1.r, temp2.i = q__1.i;
                      i__2 = j + j * a_dim1;
                      i__3 = j + j * a_dim1;
                      i__4 = jx;
                      q__2.r = x[i__4].r * temp1.r - x[i__4].i * temp1.i, q__2.i = x[i__4].r * temp1.i + x[i__4].i * temp1.r;
                      i__5 = jy;
                      q__3.r = y[i__5].r * temp2.r - y[i__5].i * temp2.i, q__3.i = y[i__5].r * temp2.i + y[i__5].i * temp2.r;
                      q__1.r = q__2.r + q__3.r, q__1.i = q__2.i + q__3.i;
                      r__1 = a[i__3].r + q__1.r;
                      a[i__2].r = r__1, a[i__2].i = 0.f;
                      ix = jx;
                      iy = jy;
                      i__2 = *n;
                      for (i__ = j + 1;
                              i__ <= i__2;
                              ++i__)
                      {
                          ix += *incx;
                          iy += *incy;
                          i__3 = i__ + j * a_dim1;
                          i__4 = i__ + j * a_dim1;
                          i__5 = ix;
                          q__3.r = x[i__5].r * temp1.r - x[i__5].i * temp1.i, q__3.i = x[i__5].r * temp1.i + x[i__5].i * temp1.r;
                          q__2.r = a[i__4].r + q__3.r, q__2.i = a[i__4].i + q__3.i;
                          i__6 = iy;
                          q__4.r = y[i__6].r * temp2.r - y[i__6].i * temp2.i, q__4.i = y[i__6].r * temp2.i + y[i__6].i * temp2.r;
                          q__1.r = q__2.r + q__4.r, q__1.i = q__2.i + q__4.i;
                          a[i__3].r = q__1.r, a[i__3].i = q__1.i;
                          /* L70: */
                      }
                  }
                  else
                  {
                      i__2 = j + j * a_dim1;
                      i__3 = j + j * a_dim1;
                      r__1 = a[i__3].r;
                      a[i__2].r = r__1, a[i__2].i = 0.f;
                  }
                  jx += *incx;
                  jy += *incy;
                  /* L80: */
              }
          }
      }
      return 0;
      /* End of CHER2 . */
  }
  /* cher2_ */
  
  