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

/* 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:                                               */

/*                                                                   */

/*   1. Redistributions of source code must retain the above         */

/*      copyright notice, this list of conditions and the following  */

/*      disclaimer.                                                  */

/*                                                                   */

/*   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,    */

/*    INCLUDING, BUT  NOT LIMITED  TO, THE IMPLIED  WARRANTIES OF    */

/*    MERCHANTABILITY  AND FITNESS FOR  A PARTICULAR  PURPOSE ARE    */

/*    DISCLAIMED.  IN  NO EVENT SHALL THE UNIVERSITY  OF TEXAS AT    */

/*    AUSTIN OR CONTRIBUTORS BE  LIABLE FOR ANY DIRECT, INDIRECT,    */

/*    INCIDENTAL,  SPECIAL, EXEMPLARY,  OR  CONSEQUENTIAL DAMAGES    */

/*    (INCLUDING, BUT  NOT LIMITED TO,  PROCUREMENT OF SUBSTITUTE    */

/*    GOODS  OR  SERVICES; LOSS  OF  USE,  DATA,  OR PROFITS;  OR    */

/*    BUSINESS INTERRUPTION) HOWEVER CAUSED  AND ON ANY THEORY OF    */

/*    LIABILITY, WHETHER  IN CONTRACT, STRICT  LIABILITY, OR TORT    */

/*    (INCLUDING NEGLIGENCE OR OTHERWISE)  ARISING IN ANY WAY OUT    */

/*    OF  THE  USE OF  THIS  SOFTWARE,  EVEN  IF ADVISED  OF  THE    */

/*    POSSIBILITY OF SUCH DAMAGE.                                    */

/*                                                                   */

/* The views and conclusions contained in the software and           */

/* documentation are those of the authors and should not be          */

/* interpreted as representing official policies, either expressed   */

/* or implied, of The University of Texas at Austin.                 */

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

#include "common.h"

static FLOAT dm1 = -1.;

#ifdef CONJ

#define GEMM_KERNEL   GEMM_KERNEL_R

#else

#define GEMM_KERNEL   GEMM_KERNEL_N

#endif

#if GEMM_DEFAULT_UNROLL_M == 1

#define GEMM_UNROLL_M_SHIFT 0

#endif

#if GEMM_DEFAULT_UNROLL_M == 2

#define GEMM_UNROLL_M_SHIFT 1

#endif

#if GEMM_DEFAULT_UNROLL_M == 4

#define GEMM_UNROLL_M_SHIFT 2

#endif

#if GEMM_DEFAULT_UNROLL_M == 8

#define GEMM_UNROLL_M_SHIFT 3

#endif

#if GEMM_DEFAULT_UNROLL_M == 16

#define GEMM_UNROLL_M_SHIFT 4

#endif

#if GEMM_DEFAULT_UNROLL_N == 1

#define GEMM_UNROLL_N_SHIFT 0

#endif

#if GEMM_DEFAULT_UNROLL_N == 2

#define GEMM_UNROLL_N_SHIFT 1

#endif

#if GEMM_DEFAULT_UNROLL_N == 4

#define GEMM_UNROLL_N_SHIFT 2

#endif

#if GEMM_DEFAULT_UNROLL_N == 8

#define GEMM_UNROLL_N_SHIFT 3

#endif

#if GEMM_DEFAULT_UNROLL_N == 16

#define GEMM_UNROLL_N_SHIFT 4

#endif

#ifndef COMPLEX

static inline void solve(BLASLONG m, BLASLONG n, FLOAT *a, FLOAT *b, FLOAT *c, BLASLONG ldc) {

  FLOAT aa,  bb;

  int i, j, k;

  a += (n - 1) * m;

  b += (n - 1) * n;

  for (i = n - 1; i >= 0; i--) {

    bb = *(b + i);

    for (j = 0; j < m; j ++) {

      aa = *(c + j + i * ldc);

      aa *= bb;

      *a   = aa;

      *(c + j + i * ldc) = aa;

      a ++;

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

	*(c + j + k * ldc) -= aa * *(b + k);

      }

    }

    b -= n;

    a -= 2 * m;

  }

}

#else

static inline void solve(BLASLONG m, BLASLONG n, FLOAT *a, FLOAT *b, FLOAT *c, BLASLONG ldc) {

  FLOAT aa1, aa2;

  FLOAT bb1, bb2;

  FLOAT cc1, cc2;

  int i, j, k;

  ldc *= 2;

  a += (n - 1) * m * 2;

  b += (n - 1) * n * 2;

  for (i = n - 1; i >= 0; i--) {

    bb1 = *(b + i * 2 + 0);

    bb2 = *(b + i * 2 + 1);

    for (j = 0; j < m; j ++) {

      aa1 = *(c + j * 2 + 0 + i * ldc);

      aa2 = *(c + j * 2 + 1 + i * ldc);

#ifndef CONJ

      cc1 = aa1 * bb1 - aa2 * bb2;

      cc2 = aa1 * bb2 + aa2 * bb1;

#else

      cc1 =  aa1 * bb1  + aa2 * bb2;

      cc2 = - aa1 * bb2 + aa2 * bb1;

#endif

      *(a + 0) = cc1;

      *(a + 1) = cc2;

      *(c + j * 2 + 0 + i * ldc) = cc1;

      *(c + j * 2 + 1 + i * ldc) = cc2;

      a += 2;

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

#ifndef CONJ

	*(c + j * 2 + 0 + k * ldc) -= cc1 * *(b + k * 2 + 0) - cc2 * *(b + k * 2 + 1);

	*(c + j * 2 + 1 + k * ldc) -= cc1 * *(b + k * 2 + 1) + cc2 * *(b + k * 2 + 0);

#else

	*(c + j * 2 + 0 + k * ldc) -=   cc1 * *(b + k * 2 + 0) + cc2 * *(b + k * 2 + 1);

	*(c + j * 2 + 1 + k * ldc) -=  -cc1 * *(b + k * 2 + 1) + cc2 * *(b + k * 2 + 0);

#endif

      }

    }

    b -= n * 2;

    a -= 4 * m;

  }

}

#endif

int CNAME(BLASLONG m, BLASLONG n, BLASLONG k,  FLOAT dummy1,

#ifdef COMPLEX

	   FLOAT dummy2,

#endif

	   FLOAT *a, FLOAT *b, FLOAT *c, BLASLONG ldc, BLASLONG offset){

  BLASLONG i, j;

  FLOAT *aa, *cc;

  BLASLONG  kk;

#if 0

  fprintf(stderr, "TRSM RT KERNEL m = %3ld  n = %3ld  k = %3ld offset = %3ld\n",

	  m, n, k, offset);

#endif

  kk = n - offset;

  c += n * ldc * COMPSIZE;

  b += n * k   * COMPSIZE;

  if (n & (GEMM_UNROLL_N - 1)) {

    j = 1;

    while (j < GEMM_UNROLL_N) {

      if (n & j) {

	aa  = a;

	b -= j * k  * COMPSIZE;

	c -= j * ldc* COMPSIZE;

	cc  = c;

	i = (m >> GEMM_UNROLL_M_SHIFT);

	if (i > 0) {

	  do {

	    if (k - kk > 0) {

	      GEMM_KERNEL(GEMM_UNROLL_M, j, k - kk, dm1, 

#ifdef COMPLEX

			  ZERO,

#endif

			  aa + GEMM_UNROLL_M * kk * COMPSIZE,

			  b  +  j            * kk * COMPSIZE, 

			  cc,

			  ldc); 

	    }

	    solve(GEMM_UNROLL_M, j, 

		  aa + (kk - j) * GEMM_UNROLL_M * COMPSIZE,

		  b  + (kk - j) * j             * COMPSIZE,

		  cc, ldc);

	    aa += GEMM_UNROLL_M * k * COMPSIZE;

	    cc += GEMM_UNROLL_M     * COMPSIZE;

	    i --;

	  } while (i > 0);

	}

	if (m & (GEMM_UNROLL_M - 1)) {

	  i = (GEMM_UNROLL_M >> 1);

	  do {

	    if (m & i) {

	      if (k - kk > 0) {

		GEMM_KERNEL(i, j, k - kk, dm1, 

#ifdef COMPLEX

			    ZERO,

#endif

			    aa + i * kk * COMPSIZE,

			    b  + j * kk * COMPSIZE, 

			    cc, ldc); 

	      }

	      solve(i, j, 

		    aa + (kk - j) * i * COMPSIZE,

		    b  + (kk - j) * j * COMPSIZE,

		    cc, ldc);

	      aa += i * k * COMPSIZE;

	      cc += i     * COMPSIZE;

	    }

	    i >>= 1;

	  } while (i > 0);

	}

	kk -= j;

      }

      j <<= 1;

    }

  }

  j = (n >> GEMM_UNROLL_N_SHIFT);

  if (j > 0) {

    do {

      aa  = a;

      b -= GEMM_UNROLL_N * k   * COMPSIZE;

      c -= GEMM_UNROLL_N * ldc * COMPSIZE;

      cc  = c;

      i = (m >> GEMM_UNROLL_M_SHIFT);

      if (i > 0) {

	do {

	  if (k - kk > 0) {

	    GEMM_KERNEL(GEMM_UNROLL_M, GEMM_UNROLL_N, k - kk, dm1, 

#ifdef COMPLEX

			ZERO,

#endif

			aa + GEMM_UNROLL_M * kk * COMPSIZE,

			b  + GEMM_UNROLL_N * kk * COMPSIZE, 

			cc,

			ldc); 

	  }

	  solve(GEMM_UNROLL_M, GEMM_UNROLL_N, 

		aa + (kk - GEMM_UNROLL_N) * GEMM_UNROLL_M * COMPSIZE, 

		b  + (kk - GEMM_UNROLL_N) * GEMM_UNROLL_N * COMPSIZE,

		cc, ldc);

	  aa += GEMM_UNROLL_M * k * COMPSIZE;

	  cc += GEMM_UNROLL_M     * COMPSIZE;

	  i --;

	} while (i > 0);

      }

      if (m & (GEMM_UNROLL_M - 1)) {

	i = (GEMM_UNROLL_M >> 1);

	do {

	  if (m & i) {

	    if (k - kk > 0) {

	      GEMM_KERNEL(i, GEMM_UNROLL_N, k - kk, dm1, 

#ifdef COMPLEX

			  ZERO,

#endif

			  aa + i             * kk * COMPSIZE,

			  b  + GEMM_UNROLL_N * kk * COMPSIZE, 

			  cc,

			  ldc); 

	    }

	    solve(i, GEMM_UNROLL_N, 

		  aa + (kk - GEMM_UNROLL_N) * i             * COMPSIZE, 

		  b  + (kk - GEMM_UNROLL_N) * GEMM_UNROLL_N * COMPSIZE,

		  cc, ldc);

	    aa += i * k * COMPSIZE;

	    cc += i     * COMPSIZE;

	  }

	  i >>= 1;

	} while (i > 0);

      }

      kk -= GEMM_UNROLL_N;

      j --;

    } while (j > 0);

  }

  return 0;

}