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

/* 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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/*      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   */

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

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

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

#include "common.h"

#ifndef MINUS

#define a2	(a1 + 2)

#else

#define a2	(a1 - 2)

#endif

int CNAME(BLASLONG n, BLASLONG k1, BLASLONG k2, FLOAT dummy1, FLOAT dummy4, 

	  FLOAT *a, BLASLONG lda, 

	  FLOAT *dummy2, BLASLONG dumy3, blasint *ipiv, BLASLONG incx){

  BLASLONG i, j, ip1, ip2;

  blasint *piv;

  FLOAT *a1;

  FLOAT *b1, *b2;

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

  a   -= 2;

  lda *= 2;

  k1 --;

#ifndef MINUS

 ipiv += k1;

#else

  ipiv -= (k2 - 1) * incx;

#endif

  if (n  <= 0) return 0;

  j = n;

  if (j > 0) {

    do {

      piv = ipiv;

#ifndef MINUS

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

#else

      a1 = a + k2 * 2;

#endif

      ip1 = *piv * 2;

      piv += incx;

      ip2 = *piv * 2;

      piv += incx;

      b1 = a + ip1;

      b2 = a + ip2;

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

      if (i > 0) {

	do {

#ifdef OPTERON

#ifndef MINUS

	  asm volatile("prefetchw  2 * 128(%0)\n"  : : "r"(a1));

	  asm volatile("prefetchw  2 * 128(%0)\n"  : : "r"(b1));

#else

	  asm volatile("prefetchw -2 * 128(%0)\n"  : : "r"(a1));

	  asm volatile("prefetchw -2 * 128(%0)\n"  : : "r"(b1));

#endif

#endif

#ifdef CORE2

#ifndef MINUS

	  asm volatile("prefetcht1  2 * 128(%0)\n"  : : "r"(a1));

	  asm volatile("prefetcht1  2 * 128(%0)\n"  : : "r"(b1));

	  asm volatile("prefetcht1  2 * 128(%0)\n"  : : "r"(b2));

#else

	  asm volatile("prefetcht1 -2 * 128(%0)\n"  : : "r"(a1));

	  asm volatile("prefetcht1 -2 * 128(%0)\n"  : : "r"(b1));

	  asm volatile("prefetcht1 -2 * 128(%0)\n"  : : "r"(b2));

#endif

#endif

	  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 * 2;

	  piv += incx;

	  ip2 = *piv * 2;

	  piv += incx;

	  if (b1 == a1) {

	    if (b2 == a1) {

	      *(a1 + 0) = A3;

	      *(a1 + 1) = A4;

	      *(a2 + 0) = A1;

	      *(a2 + 1) = A2;

	    } else 

	      if (b2 != a2) {

		*(a2 + 0) = B3;

		*(a2 + 1) = B4;

		*(b2 + 0) = A3;

		*(b2 + 1) = A4;

	      }

	  } else 

	    if (b1 == a2) {

	      if (b2 != a1) {

		if (b2 == a2) {

		  *(a1 + 0) = A3;

		  *(a1 + 1) = A4;

		  *(a2 + 0) = A1;

		  *(a2 + 1) = A2;

		} else {

		  *(a1 + 0) = A3;

		  *(a1 + 1) = A4;

		  *(a2 + 0) = B3;

		  *(a2 + 1) = B4;

		  *(b2 + 0) = A1;

		  *(b2 + 1) = A2;

		}

	      }

	    } else {

	      if (b2 == a1) {

		*(a1 + 0) = A3;

		*(a1 + 1) = A4;

		*(a2 + 0) = B1;

		*(a2 + 1) = B2;

		*(b1 + 0) = A1;

		*(b1 + 1) = A2;

	      } else 

		if (b2 == a2) {

		  *(a1 + 0) = B1;

		  *(a1 + 1) = B2;

		  *(b1 + 0) = A1;

		  *(b1 + 1) = A2;

		} else 

		  if (b2 == b1) {

		    *(a1 + 0) = B1;

		    *(a1 + 1) = B2;

		    *(a2 + 0) = A1;

		    *(a2 + 1) = A2;

		    *(b1 + 0) = A3;

		    *(b1 + 1) = A4;

		  } else {

		    *(a1 + 0) = B1;

		    *(a1 + 1) = B2;

		    *(a2 + 0) = B3;

		    *(a2 + 1) = B4;

		    *(b1 + 0) = A1;

		    *(b1 + 1) = A2;

		    *(b2 + 0) = A3;

		    *(b2 + 1) = A4;

		  }

	    }

	  b1 = a + ip1;

	  b2 = a + ip2;

#ifndef MINUS

	  a1 += 4;

#else

	  a1 -= 4;

#endif

	i --;

	} while (i > 0);

      }

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

      if (i > 0) {

	A1 = *(a1 + 0);

	A2 = *(a1 + 1);

	B1 = *(b1 + 0);

	B2 = *(b1 + 1);

	*(a1 + 0) = B1;

	*(a1 + 1) = B2;

	*(b1 + 0) = A1;

	*(b1 + 1) = A2;

      }

      a += lda;

      j --;

    } while (j > 0);

  }

  return 0;

}