/*********************************************************************/
/* Copyright 2009, 2010 The University of Texas at Austin.           */
/* All rights reserved.                                              */
/*                                                                   */
/* Redistribution and use in source and binary forms, with or        */
/* without modification, are permitted provided that the following   */
/* conditions are met:                                               */
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/*   1. Redistributions of source code must retain the above         */
/*      copyright notice, this list of conditions and the following  */
/*      disclaimer.                                                  */
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/*   2. Redistributions in binary form must reproduce the above      */
/*      copyright notice, this list of conditions and the following  */
/*      disclaimer in the documentation and/or other materials       */
/*      provided with the distribution.                              */
/*                                                                   */
/*    THIS  SOFTWARE IS PROVIDED  BY THE  UNIVERSITY OF  TEXAS AT    */
/*    AUSTIN  ``AS IS''  AND ANY  EXPRESS OR  IMPLIED WARRANTIES,    */
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/* documentation are those of the authors and should not be          */
/* interpreted as representing official policies, either expressed   */
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/*********************************************************************/

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

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

  BLASLONG n, bk, i, blocking, lda;
  BLASLONG info;
  int mode;
  blas_arg_t newarg;
  FLOAT *a;
  FLOAT alpha[2] = { -ONE, ZERO};

#ifndef COMPLEX
#ifdef XDOUBLE
  mode  =  BLAS_XDOUBLE | BLAS_REAL;
#elif defined(DOUBLE)
  mode  =  BLAS_DOUBLE  | BLAS_REAL;
#else
  mode  =  BLAS_SINGLE  | BLAS_REAL;
#endif
#else
#ifdef XDOUBLE
  mode  =  BLAS_XDOUBLE | BLAS_COMPLEX;
#elif defined(DOUBLE)
  mode  =  BLAS_DOUBLE  | BLAS_COMPLEX;
#else
  mode  =  BLAS_SINGLE  | BLAS_COMPLEX;
#endif
#endif

  if (args -> nthreads  == 1) {
    info = POTRF_L_SINGLE(args, NULL, NULL, sa, sb, 0);
    return info;
  }

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

  if (range_n) n  = range_n[1] - range_n[0];

  if (n <= GEMM_UNROLL_N * 4) {
    info = POTRF_L_SINGLE(args, NULL, range_n, sa, sb, 0);
    return info;
  }

  newarg.lda = lda;
  newarg.ldb = lda;
  newarg.ldc = lda;
  newarg.alpha = alpha;
  newarg.beta = NULL;
  newarg.nthreads = args -> nthreads;

  blocking = (n / 2 + GEMM_UNROLL_N - 1) & ~(GEMM_UNROLL_N - 1);
  if (blocking > GEMM_Q) blocking = GEMM_Q;

  for (i = 0; i < n; i += blocking) {
    bk = n - i;
    if (bk > blocking) bk = blocking;

    newarg.m = bk;
    newarg.n = bk;
    newarg.a = a + (i + i * lda) * COMPSIZE;

    info = CNAME(&newarg, NULL, NULL, sa, sb, 0);
    if (info) return info + i;

    if (n - i - bk > 0) {
      newarg.m = n - i - bk;
      newarg.n = bk;
      newarg.a = a + (i      + i * lda) * COMPSIZE;
      newarg.b = a + (i + bk + i * lda) * COMPSIZE;

      gemm_thread_m(mode | BLAS_RSIDE | BLAS_TRANSA_T | BLAS_UPLO,
		    &newarg, NULL, NULL, (void *)TRSM_RCLN, sa, sb, args -> nthreads);

      newarg.n = n - i - bk;
      newarg.k = bk;
      newarg.a = a + (i + bk +  i       * lda) * COMPSIZE;
      newarg.c = a + (i + bk + (i + bk) * lda) * COMPSIZE;

#ifndef USE_SIMPLE_THREADED_LEVEL3
      HERK_THREAD_LN(&newarg, NULL, NULL, sa, sb, 0);
#else
      syrk_thread(mode | BLAS_TRANSA_N | BLAS_TRANSB_T | BLAS_UPLO,
		  &newarg, NULL, NULL, (void *)HERK_LN, sa, sb, args -> nthreads);
#endif
    }
  }

  return 0;
}