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

/* 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.                                                  */

/*                                                                   */

/*   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   */

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

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

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

#include "common.h"

#define PREFETCHSIZE  8

#define a2	(a1 + 1)

#define a4	(a3 + 1)

#define a6	(a5 + 1)

#define a8	(a7 + 1)

int CNAME(BLASLONG n, BLASLONG k1, BLASLONG k2, FLOAT *a, BLASLONG lda, blasint *ipiv, FLOAT *buffer){

  BLASLONG i, j, ip1, ip2;

  blasint *piv;

  FLOAT *a1, *a3, *a5, *a7;

  FLOAT *b1, *b2, *b3, *b4;

  FLOAT *b5, *b6, *b7, *b8;

  FLOAT A1, A2, B1, B2, A3, A4, B3, B4;

  FLOAT A5, A6, B5, B6, A7, A8, B7, B8;

  a--;

  k1 --;

 ipiv += k1;

  if (n  <= 0) return 0;

  j = (n >> 2);

  if (j > 0) {

    do {

      piv = ipiv;

      a1 = a + k1 + 1;

      a3 = a1 + 1 * lda;

      a5 = a1 + 2 * lda;

      a7 = a1 + 3 * lda;

      ip1 = *(piv + 0);

      ip2 = *(piv + 1);

      piv += 2;

      b1 = a + ip1;

      b2 = a + ip2;

      b3 = b1 + 1 * lda;

      b4 = b2 + 1 * lda;

      b5 = b1 + 2 * lda;

      b6 = b2 + 2 * lda;

      b7 = b1 + 3 * lda;

      b8 = b2 + 3 * lda;

      i = ((k2 - k1) >> 1);

      if (i > 0) {

	do {

#ifdef __GNUC__

	  __builtin_prefetch(a1 + PREFETCHSIZE, 0, 0);

	  __builtin_prefetch(a3 + PREFETCHSIZE, 0, 0);

	  __builtin_prefetch(a5 + PREFETCHSIZE, 0, 0);

	  __builtin_prefetch(a7 + PREFETCHSIZE, 0, 0);

#endif

	  A1 = *a1;

	  A2 = *a2;

	  A3 = *a3;

	  A4 = *a4;

	  A5 = *a5;

	  A6 = *a6;

	  A7 = *a7;

	  A8 = *a8;

	  B1 = *b1;

	  B2 = *b2;

	  B3 = *b3;

	  B4 = *b4;

	  B5 = *b5;

	  B6 = *b6;

	  B7 = *b7;

	  B8 = *b8;

	  ip1 = *(piv + 0);

	  ip2 = *(piv + 1);

	  piv += 2;

	if (b1 == a1) {

	    if (b2 == a2) {

	      *(buffer + 0) = A1;

	      *(buffer + 1) = A3;

	      *(buffer + 2) = A5;

	      *(buffer + 3) = A7;

	      *(buffer + 4) = A2;

	      *(buffer + 5) = A4;

	      *(buffer + 6) = A6;

	      *(buffer + 7) = A8;

	    } else {

	      *(buffer + 0) = A1;

	      *(buffer + 1) = A3;

	      *(buffer + 2) = A5;

	      *(buffer + 3) = A7;

	      *(buffer + 4) = B2;

	      *(buffer + 5) = B4;

	      *(buffer + 6) = B6;

	      *(buffer + 7) = B8;

	      *b2 = A2;

	      *b4 = A4;

	      *b6 = A6;

	      *b8 = A8;

	    }

	} else 

	  if (b1 == a2) {

	      if (b2 == a2) {

		*(buffer + 0) = A2;

		*(buffer + 1) = A4;

		*(buffer + 2) = A6;

		*(buffer + 3) = A8;

		*(buffer + 4) = A1;

		*(buffer + 5) = A3;

		*(buffer + 6) = A5;

		*(buffer + 7) = A7;

	      } else {

		*(buffer + 0) = A2;

		*(buffer + 1) = A4;

		*(buffer + 2) = A6;

		*(buffer + 3) = A8;

		*(buffer + 4) = B2;

		*(buffer + 5) = B4;

		*(buffer + 6) = B6;

		*(buffer + 7) = B8;

		*b2 = A1;

		*b4 = A3;

		*b6 = A5;

		*b8 = A7;

	      }

	  } else {

	      if (b2 == a2) {

		*(buffer + 0) = B1;

		*(buffer + 1) = B3;

		*(buffer + 2) = B5;

		*(buffer + 3) = B7;

		*(buffer + 4) = A2;

		*(buffer + 5) = A4;

		*(buffer + 6) = A6;

		*(buffer + 7) = A8;

		*b1 = A1;

		*b3 = A3;

		*b5 = A5;

		*b7 = A7;

	      } else 

		if (b2 == b1) {

		  *(buffer + 0) = B1;

		  *(buffer + 1) = B3;

		  *(buffer + 2) = B5;

		  *(buffer + 3) = B7;

		  *(buffer + 4) = A1;

		  *(buffer + 5) = A3;

		  *(buffer + 6) = A5;

		  *(buffer + 7) = A7;

		  *b1 = A2;

		  *b3 = A4;

		  *b5 = A6;

		  *b7 = A8;

		} else {

		  *(buffer + 0) = B1;

		  *(buffer + 1) = B3;

		  *(buffer + 2) = B5;

		  *(buffer + 3) = B7;

		  *(buffer + 4) = B2;

		  *(buffer + 5) = B4;

		  *(buffer + 6) = B6;

		  *(buffer + 7) = B8;

		  *b1 = A1;

		  *b2 = A2;

		  *b3 = A3;

		  *b4 = A4;

		  *b5 = A5;

		  *b6 = A6;

		  *b7 = A7;

		  *b8 = A8;

		}

	  }

	 buffer += 8;

	  b1 = a + ip1;

	  b2 = a + ip2;

	  b3 = b1 + 1 * lda;

	  b4 = b2 + 1 * lda;

	  b5 = b1 + 2 * lda;

	  b6 = b2 + 2 * lda;

	  b7 = b1 + 3 * lda;

	  b8 = b2 + 3 * lda;

	  a1 += 2;

	  a3 += 2;

	  a5 += 2;

	  a7 += 2;

	i --;

	} while (i > 0);

      }

      i = ((k2 - k1) & 1);

      if (i > 0) {

	A1 = *a1;

	B1 = *b1;

	A3 = *a3;

	B3 = *b3;

	A5 = *a5;

	B5 = *b5;

	A7 = *a7;

	B7 = *b7;

	if (a1 == b1) {

	  *(buffer + 0) = A1;

	  *(buffer + 1) = A3;

	  *(buffer + 2) = A5;

	  *(buffer + 3) = A7;

	} else {

	  *(buffer + 0) = B1;

	  *(buffer + 1) = B3;

	  *(buffer + 2) = B5;

	  *(buffer + 3) = B7;

	  *b1 = A1;

	  *b3 = A3;

	  *b5 = A5;

	  *b7 = A7;

	}

	buffer += 4;

      }

      a += 4 * lda;

      j --;

    } while (j > 0);

  }

  if (n & 2) {

    piv = ipiv;

    a1 = a + k1 + 1;

    a3 = a1 + 1 * lda;

    ip1 = *(piv + 0);

    ip2 = *(piv + 1);

    piv += 2;

    b1 = a + ip1;

    b2 = a + ip2;

    b3 = b1 + 1 * lda;

    b4 = b2 + 1 * lda;

    i = ((k2 - k1) >> 1);

    if (i > 0) {

      do {

	A1 = *a1;

	A2 = *a2;

	A3 = *a3;

	A4 = *a4;

	B1 = *b1;

	B2 = *b2;

	B3 = *b3;

	B4 = *b4;

	ip1 = *(piv + 0);

	ip2 = *(piv + 1);

	piv += 2;

	if (b1 == a1) {

	    if (b2 == a2) {

	      *(buffer + 0) = A1;

	      *(buffer + 1) = A3;

	      *(buffer + 2) = A2;

	      *(buffer + 3) = A4;

	    } else {

	      *(buffer + 0) = A1;

	      *(buffer + 1) = A3;

	      *(buffer + 2) = B2;

	      *(buffer + 3) = B4;

	      *b2 = A2;

	      *b4 = A4;

	    }

	} else 

	  if (b1 == a2) {

	      if (b2 == a2) {

		*(buffer + 0) = A2;

		*(buffer + 1) = A4;

		*(buffer + 2) = A1;

		*(buffer + 3) = A3;

	      } else {

		*(buffer + 0) = A2;

		*(buffer + 1) = A4;

		*(buffer + 2) = B2;

		*(buffer + 3) = B4;

		*b2 = A1;

		*b4 = A3;

	      }

	  } else {

	      if (b2 == a2) {

		*(buffer + 0) = B1;

		*(buffer + 1) = B3;

		*(buffer + 2) = A2;

		*(buffer + 3) = A4;

		*b1 = A1;

		*b3 = A3;

	      } else 

		if (b2 == b1) {

		  *(buffer + 0) = B1;

		  *(buffer + 1) = B3;

		  *(buffer + 2) = A1;

		  *(buffer + 3) = A3;

		  *b1 = A2;

		  *b3 = A4;

		} else {

		  *(buffer + 0) = B1;

		  *(buffer + 1) = B3;

		  *(buffer + 2) = B2;

		  *(buffer + 3) = B4;

		  *b1 = A1;

		  *b2 = A2;

		  *b3 = A3;

		  *b4 = A4;

		}

	  }

	buffer += 4;

	b1 = a + ip1;

	b2 = a + ip2;

	b3 = b1 + 1 * lda;

	b4 = b2 + 1 * lda;

	a1 += 2;

	a3 += 2;

	i --;

      } while (i > 0);

    }

    i = ((k2 - k1) & 1);

    if (i > 0) {

      A1 = *a1;

      B1 = *b1;

      A3 = *a3;

      B3 = *b3;

      if (a1 == b1) {

	*(buffer + 0) = A1;

	*(buffer + 1) = A3;

      } else {

	*(buffer + 0) = B1;

	*(buffer + 1) = B3;

	*b1 = A1;

	*b3 = A3;

      }

      buffer += 2;

    }

    a += 2 * lda;

  }

  if (n & 1) {

    piv = ipiv;

    a1 = a + k1 + 1;

    ip1 = *(piv + 0);

    ip2 = *(piv + 1);

    piv += 2;

    b1 = a + ip1;

    b2 = a + ip2;

    i = ((k2 - k1) >> 1);

    if (i > 0) {

      do {

	A1 = *a1;

	A2 = *a2;

	B1 = *b1;

	B2 = *b2;

	ip1 = *(piv + 0);

	ip2 = *(piv + 1);

	piv += 2;

	if (b1 == a1) {

	    if (b2 == a2) {

	      *(buffer + 0) = A1;

	      *(buffer + 1) = A2;

	    } else {

	      *(buffer + 0) = A1;

	      *(buffer + 1) = B2;

	      *b2 = A2;

	    }

	} else 

	  if (b1 == a2) {

	      if (b2 == a2) {

		*(buffer + 0) = A2;

		*(buffer + 1) = A1;

	      } else {

		*(buffer + 0) = A2;

		*(buffer + 1) = B2;

		*b2 = A1;

	      }

	  } else {

	      if (b2 == a2) {

		*(buffer + 0) = B1;

		*(buffer + 1) = A2;

		*b1 = A1;

	      } else 

		if (b2 == b1) {

		  *(buffer + 0) = B1;

		  *(buffer + 1) = A1;

		  *b1 = A2;

		} else {

		  *(buffer + 0) = B1;

		  *(buffer + 1) = B2;

		  *b1 = A1;

		  *b2 = A2;

		}

	  }

	buffer += 2;

	b1 = a + ip1;

	b2 = a + ip2;

	a1 += 2;

	i --;

      } while (i > 0);

    }

    i = ((k2 - k1) & 1);

    if (i > 0) {

      A1 = *a1;

      B1 = *b1;

      if (a1 == b1) {

	*(buffer + 0) = A1;

      } else {

	*(buffer + 0) = B1;

	*b1 = A1;

      }

    }

  }

  return 0;

}