OpenBLAS/lapack/lauu2/lauu2_U.c

/*********************************************************************/
/* Copyright 2009, 2010 The University of Texas at Austin.           */
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/*********************************************************************/

#include <stdio.h>
#include "common.h"

static FLOAT dp1 =  1.;

blasint CNAME(blas_arg_t *args, BLASLONG *range_m, BLASLONG *range_n, FLOAT *sa, FLOAT *sb, BLASLONG myid) {

  BLASLONG  n, lda;
  FLOAT *a;

  FLOAT aii;
  BLASLONG i;

  n      = args -> n;
  a      = (FLOAT *)args -> a;
  lda    = args -> lda;

  if (range_n) {
    n      = range_n[1] - range_n[0];
    a     += range_n[0] * (lda + 1) * COMPSIZE;
  }

  for (i = 0; i < n; i++) {

    SCAL_K(i + 1, 0, 0, *(a + i + i * lda), a + i * lda, 1, NULL, 0, NULL, 0);

    if (i < n - 1) {
      aii = DOTU_K(n - i - 1, a + i + (i + 1)* lda, lda, a + i + (i + 1) * lda, lda);

      *(a + i + i * lda) += aii;

      GEMV_N(i, n - i - 1, 0, dp1,
	     a     + (i + 1) * lda, lda,
	     a + i + (i + 1) * lda, lda,
	     a +      i      * lda, 1, sb);
    }
  }

  return 0;
}