/*********************************************************************/
/* 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,    */
/*    INCLUDING, BUT  NOT LIMITED  TO, THE IMPLIED  WARRANTIES OF    */
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/*                                                                   */
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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>
#include "common.h"

#ifndef MINUS
#define a2	(a1 + 1)
#else
#define a2	(a1 - 1)
#endif

int CNAME(BLASLONG n, BLASLONG k1, BLASLONG k2, FLOAT dummy1, 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;
  
  a--;
  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;
#else
      a1 = a + k2;
#endif

      ip1 = *piv;
      piv += incx;
      ip2 = *piv;
      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;
	  A2 = *a2;
	  B1 = *b1;
	  B2 = *b2;
	  
	  ip1 = *piv;
	  piv += incx;
	  ip2 = *piv;
	  piv += incx;
	  
	  if (b1 == a1) {
	    if (b2 == a1) {
	      *a1 = A2;
	      *a2 = A1;
	    } else 
	      if (b2 != a2) {
		*a2 = B2;
		*b2 = A2;
	      }
	  } else 
	    if (b1 == a2) {
	      if (b2 != a1) {
		if (b2 == a2) {
		  *a1 = A2;
		  *a2 = A1;
		} else {
		  *a1 = A2;
		  *a2 = B2;
		  *b2 = A1;
		}
	      }
	    } else {
	      if (b2 == a1) {
		*a1 = A2;
		*a2 = B1;
		*b1 = A1;
	      } else 
		if (b2 == a2) {
		  *a1 = B1;
		  *b1 = A1;
		} else 
		  if (b2 == b1) {
		    *a1 = B1;
		    *a2 = A1;
		    *b1 = A2;
		  } else {
		    *a1 = B1;
		    *a2 = B2;
		    *b1 = A1;
		    *b2 = A2;
		  }
	    }
	  
	  b1 = a + ip1;
	  b2 = a + ip2;
	  
#ifndef MINUS
	  a1 += 2;
#else
	  a1 -= 2;
#endif
	i --;
	} while (i > 0);
      }
      
      i = ((k2 - k1) & 1);
      
      if (i > 0) {
	A1 = *a1;
	B1 = *b1;
	*a1 = B1;
	*b1 = A1;
      }
      
      a += lda;
      
      j --;
    } while (j > 0);
  }

  return 0;
}