/*********************************************************************/

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

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/* Redistribution and use in source and binary forms, with or        */

/* without modification, are permitted provided that the following   */

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/*   2. Redistributions in binary form must reproduce the above      */

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/*    THIS  SOFTWARE IS PROVIDED  BY THE  UNIVERSITY OF  TEXAS AT    */

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/*********************************************************************/

#include <stdio.h></stdio.h>

#include "common.h"

static FLOAT dp1 =  1.;

static FLOAT dm1 = -1.;

#ifdef UNIT

#define TRTI2	TRTI2_LU

#else

#define TRTI2	TRTI2_LN

#endif

#if 0

#undef GEMM_P

#undef GEMM_Q

#undef GEMM_R

#define GEMM_P 8

#define GEMM_Q 20

#define GEMM_R 64

#endif

#define GEMM_PQ  MAX(GEMM_P, GEMM_Q)

#define REAL_GEMM_R (GEMM_R - 2 * GEMM_PQ)

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

  BLASLONG  n, lda;

  FLOAT *a;

  BLASLONG i, is, min_i, start_i;

  BLASLONG ls, min_l;

  BLASLONG bk;

  BLASLONG blocking;

  BLASLONG range_N[2];

  FLOAT *sa_trsm = (FLOAT *)((BLASLONG)sb);

  FLOAT *sa_trmm = (FLOAT *)((((BLASLONG)sb

			       + GEMM_PQ * GEMM_Q * COMPSIZE * SIZE + GEMM_ALIGN) & ~GEMM_ALIGN)

			     + GEMM_OFFSET_A);

  FLOAT *sb_gemm = (FLOAT *)((((BLASLONG)sa_trmm

			       + GEMM_PQ * GEMM_Q * COMPSIZE * SIZE + GEMM_ALIGN) & ~GEMM_ALIGN)

			     + GEMM_OFFSET_B);

  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;

  }

  if (n <= DTB_ENTRIES) {

    TRTI2(args, NULL, range_n, sa, sb, 0);

    return 0;

  }

  blocking = GEMM_Q;

  if (n <= 4 * GEMM_Q) blocking = (n + 3) / 4;

  start_i = 0;

  while (start_i < n) start_i += blocking;

  start_i -= blocking;

  for (i = start_i; i >= 0; i -= blocking) {

    bk = MIN(blocking, n - i);

    if (n - bk - i > 0) TRSM_OLNCOPY(bk, bk, a + (i + i * lda) * COMPSIZE, lda, 0, sa_trsm);

    if (!range_n) {

      range_N[0] = i;

      range_N[1] = i + bk;

    } else {

      range_N[0] = range_n[0] + i;

      range_N[1] = range_n[0] + i + bk;

    }

    CNAME(args, NULL, range_N, sa, sa_trmm, 0);

    if (i > 0) {

      TRMM_ILTCOPY(bk, bk, a + (i + i * lda) * COMPSIZE, lda, 0, 0, sa_trmm);

      for (ls = 0; ls < i; ls += REAL_GEMM_R) {

	min_l = i - ls;

	if (min_l > REAL_GEMM_R) min_l = REAL_GEMM_R;

	GEMM_ONCOPY (bk, min_l, a + (i + ls * lda) * COMPSIZE, lda, sb_gemm);

	if (n - bk - i > 0) {

	  for (is = i + bk; is < n; is += GEMM_P) {

	    min_i = n - is;

	    if (min_i > GEMM_P) min_i = GEMM_P;

	    if (ls == 0) {

	      NEG_TCOPY (bk, min_i, a + (is + i * lda) * COMPSIZE, lda, sa);

	      TRSM_KERNEL_RT(min_i, bk, bk, dm1, 

#ifdef COMPLEX

			     ZERO,

#endif

			     sa, sa_trsm,

			     a + (is + i * lda) * COMPSIZE, lda, 0);

	    } else {

	      GEMM_ITCOPY (bk, min_i, a + (is + i * lda) * COMPSIZE, lda, sa);

	    }

	    GEMM_KERNEL_N(min_i, min_l, bk, dp1, 

#ifdef COMPLEX

			  ZERO,

#endif

			  sa, sb_gemm,

			  a + (is + ls * lda) * COMPSIZE, lda);

	  }

	}

	for (is = 0; is < bk; is += GEMM_P) {

	  min_i = bk - is;

	  if (min_i > GEMM_P) min_i = GEMM_P;

	  TRMM_KERNEL_LT(min_i, min_l, bk, dp1, 

#ifdef COMPLEX

			 ZERO,

#endif

			 sa_trmm + is * bk * COMPSIZE, sb_gemm,

			 a + (i + is + ls * lda) * COMPSIZE, lda, is);

	}

      }

    } else {

      if (n - bk - i > 0) {

	for (is = 0; is < n - bk - i; is += GEMM_P) {

	  min_i = n - bk - i - is;

	  if (min_i > GEMM_P) min_i = GEMM_P;

	  NEG_TCOPY (bk, min_i, a + (i + bk + is + i * lda) * COMPSIZE, lda, sa);

	  TRSM_KERNEL_RT(min_i, bk, bk, dm1, 

#ifdef COMPLEX

			 ZERO,

#endif

			 sa, sa_trsm,

			 a + (i + bk + is + i * lda) * COMPSIZE, lda, 0);

	}

      }

    }

  }

  return 0;

}