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

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

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

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/*      disclaimer.                                                  */

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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    */

/*    AUSTIN  ``AS IS''  AND ANY  EXPRESS OR  IMPLIED WARRANTIES,    */

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

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

#include "common.h"

#define a2	(a1 + 2)

#define a4	(a3 + 2)

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;

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

  FLOAT A1, A2, A3, A4;

  FLOAT A5, A6, A7, A8;

  FLOAT B1, B2, B3, B4;

  FLOAT B5, B6, B7, B8;

  a -= 2;

  lda *= 2;

  k1 --;

 ipiv += k1;

  if (n  <= 0) return 0;

  j = (n >> 1);

  if (j > 0) {

    do {

      piv = ipiv;

      a1 = a + (k1 + 1) * 2;

      a3 = a1 + lda;

      ip1 = *(piv + 0) * 2;

      ip2 = *(piv + 1) * 2;

      piv += 2;

      b1 = a + ip1;

      b2 = a + ip2;

      b3 = b1 + lda;

      b4 = b2 + lda;

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

      if (i > 0) {

	do {

	  A1 = *(a1 + 0);

	  A2 = *(a1 + 1);

	  A3 = *(a2 + 0);

	  A4 = *(a2 + 1);

	  A5 = *(a3 + 0);

	  A6 = *(a3 + 1);

	  A7 = *(a4 + 0);

	  A8 = *(a4 + 1);

	  B1 = *(b1 + 0);

	  B2 = *(b1 + 1);

	  B3 = *(b2 + 0);

	  B4 = *(b2 + 1);

	  B5 = *(b3 + 0);

	  B6 = *(b3 + 1);

	  B7 = *(b4 + 0);

	  B8 = *(b4 + 1);

	  ip1 = *(piv + 0) * 2;

	  ip2 = *(piv + 1) * 2;

	  piv += 2;

	  if (b1 == a1) {

	    if (b2 == a2) {

	      *(buffer + 0) = A1;

	      *(buffer + 1) = A2;

	      *(buffer + 2) = A5;

	      *(buffer + 3) = A6;

	      *(buffer + 4) = A3;

	      *(buffer + 5) = A4;

	      *(buffer + 6) = A7;

	      *(buffer + 7) = A8;

	    } else {

	      *(buffer + 0) = A1;

	      *(buffer + 1) = A2;

	      *(buffer + 2) = A5;

	      *(buffer + 3) = A6;

	      *(buffer + 4) = B3;

	      *(buffer + 5) = B4;

	      *(buffer + 6) = B7;

	      *(buffer + 7) = B8;

	      *(b2 + 0) = A3;

	      *(b2 + 1) = A4;

	      *(b4 + 0) = A7;

	      *(b4 + 1) = A8;

	    }

	} else 

	  if (b1 == a2) {

	    if (b2 == a2) {

	      *(buffer + 0) = A3;

	      *(buffer + 1) = A4;

	      *(buffer + 2) = A7;

	      *(buffer + 3) = A8;

	      *(buffer + 4) = A1;

	      *(buffer + 5) = A2;

	      *(buffer + 6) = A5;

	      *(buffer + 7) = A6;

	    } else {

	      *(buffer + 0) = A3;

	      *(buffer + 1) = A4;

	      *(buffer + 2) = A7;

	      *(buffer + 3) = A8;

	      *(buffer + 4) = B3;

	      *(buffer + 5) = B4;

	      *(buffer + 6) = B7;

	      *(buffer + 7) = B8;

	      *(b2 + 0) = A1;

	      *(b2 + 1) = A2;

	      *(b4 + 0) = A5;

	      *(b4 + 1) = A6;

	    }

	  } else {

	    if (b2 == a2) {

	      *(buffer + 0) = B1;

	      *(buffer + 1) = B2;

	      *(buffer + 2) = B5;

	      *(buffer + 3) = B6;

	      *(buffer + 4) = A3;

	      *(buffer + 5) = A4;

	      *(buffer + 6) = A7;

	      *(buffer + 7) = A8;

	      *(b1 + 0) = A1;

	      *(b1 + 1) = A2;

	      *(b3 + 0) = A5;

	      *(b3 + 1) = A6;

	    } else 

	      if (b2 == b1) {

		*(buffer + 0) = B1;

		*(buffer + 1) = B2;

		*(buffer + 2) = B5;

		*(buffer + 3) = B6;

		*(buffer + 4) = A1;

		*(buffer + 5) = A2;

		*(buffer + 6) = A5;

		*(buffer + 7) = A6;

		*(b1 + 0) = A3;

		*(b1 + 1) = A4;

		*(b3 + 0) = A7;

		*(b3 + 1) = A8;

	      } else {

		*(buffer + 0) = B1;

		*(buffer + 1) = B2;

		*(buffer + 2) = B5;

		*(buffer + 3) = B6;

		*(buffer + 4) = B3;

		*(buffer + 5) = B4;

		*(buffer + 6) = B7;

		*(buffer + 7) = B8;

		*(b1 + 0) = A1;

		*(b1 + 1) = A2;

		*(b2 + 0) = A3;

		*(b2 + 1) = A4;

		*(b3 + 0) = A5;

		*(b3 + 1) = A6;

		*(b4 + 0) = A7;

		*(b4 + 1) = A8;

	      }

	  }

	  buffer += 8;

	  b1 = a + ip1;

	  b2 = a + ip2;

	  b3 = b1 + lda;

	  b4 = b2 + lda;

	  a1 += 4;

	  a3 += 4;

	  i --;

	} while (i > 0);

      }

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

      if (i > 0) {

	A1 = *(a1 + 0);

	A2 = *(a1 + 1);

	B1 = *(b1 + 0);

	B2 = *(b1 + 1);

	A3 = *(a3 + 0);

	A4 = *(a3 + 1);

	B3 = *(b3 + 0);

	B4 = *(b3 + 1);

	if (a1 == b1) {

	  *(buffer + 0) = A1;

	  *(buffer + 1) = A2;

	  *(buffer + 2) = A3;

	  *(buffer + 3) = A4;

	} else {

	  *(buffer + 0) = B1;

	  *(buffer + 1) = B2;

	  *(buffer + 2) = B3;

	  *(buffer + 3) = B4;

	  *(b1 + 0) = A1;

	  *(b1 + 1) = A2;

	  *(b3 + 0) = A3;

	  *(b3 + 1) = A4;

	}

	buffer += 4;

      }

      a += 2 * lda;

      j --;

    } while (j > 0);

  }

  if (n & 1) {

    piv = ipiv;

    a1 = a + (k1 + 1) * 2;

    ip1 = *(piv + 0) * 2;

    ip2 = *(piv + 1) * 2;

    piv += 2;

    b1 = a + ip1;

    b2 = a + ip2;

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

    if (i > 0) {

      do {

	A1 = *(a1 + 0);

	A2 = *(a1 + 1);

	A3 = *(a2 + 0);

	A4 = *(a2 + 1);

	B1 = *(b1 + 0);

	B2 = *(b1 + 1);

	B3 = *(b2 + 0);

	B4 = *(b2 + 1);

	ip1 = *(piv + 0) * 2;

	ip2 = *(piv + 1) * 2;

	piv += 2;

	if (b1 == a1) {

	  if (b2 == a2) {

	    *(buffer + 0) = A1;

	    *(buffer + 1) = A2;

	    *(buffer + 2) = A3;

	    *(buffer + 3) = A4;

	  } else {

	    *(buffer + 0) = A1;

	    *(buffer + 1) = A2;

	    *(buffer + 2) = B3;

	    *(buffer + 3) = B4;

	    *(b2 + 0) = A3;

	    *(b2 + 1) = A4;

	  }

	} else 

	  if (b1 == a2) {

	    if (b2 == a2) {

	      *(buffer + 0) = A3;

	      *(buffer + 1) = A4;

	      *(buffer + 2) = A1;

	      *(buffer + 3) = A2;

	    } else {

	      *(buffer + 0) = A3;

	      *(buffer + 1) = A4;

	      *(buffer + 2) = B3;

	      *(buffer + 3) = B4;

	      *(b2 + 0) = A1;

	      *(b2 + 1) = A2;

	    }

	  } else {

	    if (b2 == a2) {

	      *(buffer + 0) = B1;

	      *(buffer + 1) = B2;

	      *(buffer + 2) = A3;

	      *(buffer + 3) = A4;

	      *(b1 + 0) = A1;

	      *(b1 + 1) = A2;

	    } else 

	      if (b2 == b1) {

		*(buffer + 0) = B1;

		*(buffer + 1) = B2;

		*(buffer + 2) = A1;

		*(buffer + 3) = A2;

		*(b1 + 0) = A3;

		*(b1 + 1) = A4;

	      } else {

		*(buffer + 0) = B1;

		*(buffer + 1) = B2;

		*(buffer + 2) = B3;

		*(buffer + 3) = B4;

		*(b1 + 0) = A1;

		*(b1 + 1) = A2;

		*(b2 + 0) = A3;

		*(b2 + 1) = A4;

	      }

	  }

	buffer += 4;

	b1 = a + ip1;

	b2 = a + ip2;

	a1 += 4;

	i --;

      } while (i > 0);

    }

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

    if (i > 0) {

      A1 = *(a1 + 0);

      A2 = *(a1 + 1);

      B1 = *(b1 + 0); 

      B2 = *(b1 + 1);

      if (a1 == b1) {

	*(buffer + 0) = A1;

	*(buffer + 1) = A2;

      } else {

	*(buffer + 0) = B1;

	*(buffer + 1) = B2;

	*(b1 + 0) = A1;

	*(b1 + 1) = A2;

      }

      buffer += 2;

    }

  }

  return 0;

}