/*********************************************************************/
/* 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.                                                  */
/*                                                                   */
/*   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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/*                                                                   */
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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 + 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;
  FLOAT A5, A6, B5, B6, A7, A8, B7, B8;

  a   -= 2;
  lda *= 2;
  k1 --;

#ifndef MINUS
 ipiv += k1;
#else
  ipiv -= (k2 - 1) * incx;
#endif

  if (n  <= 0) return 0;


  j = (n >> 1);
  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 CORE2
#ifndef MINUS
	  asm volatile("prefetcht0  1 * 64(%0)\n"  : : "r"(b1));
	  asm volatile("prefetcht0  1 * 64(%0)\n"  : : "r"(b1 + lda));
	  asm volatile("prefetcht0  1 * 64(%0)\n"  : : "r"(a1));
	  asm volatile("prefetcht0  1 * 64(%0)\n"  : : "r"(a1 + lda));
#else
	  asm volatile("prefetcht0 -1 * 64(%0)\n"  : : "r"(b1));
	  asm volatile("prefetcht0 -1 * 64(%0)\n"  : : "r"(b1 + lda));
	  asm volatile("prefetcht0 -1 * 64(%0)\n"  : : "r"(a1));
	  asm volatile("prefetcht0 -1 * 64(%0)\n"  : : "r"(a1 + lda));
#endif
#endif

	  A1 = *(a1 + 0);
	  A2 = *(a1 + 1);
	  A3 = *(a2 + 0);
	  A4 = *(a2 + 1);

	  A5 = *(a1 + 0 + lda);
	  A6 = *(a1 + 1 + lda);
	  A7 = *(a2 + 0 + lda);
	  A8 = *(a2 + 1 + lda);

	  B1 = *(b1 + 0);
	  B2 = *(b1 + 1);
	  B3 = *(b2 + 0);
	  B4 = *(b2 + 1);
	  
	  B5 = *(b1 + 0 + lda);
	  B6 = *(b1 + 1 + lda);
	  B7 = *(b2 + 0 + lda);
	  B8 = *(b2 + 1 + lda);

	  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;
	      *(a1 + 0 + lda) = A7;
	      *(a1 + 1 + lda) = A8;
	      *(a2 + 0 + lda) = A5;
	      *(a2 + 1 + lda) = A6;
	    } else 
	      if (b2 != a2) {
		*(a2 + 0) = B3;
		*(a2 + 1) = B4;
		*(b2 + 0) = A3;
		*(b2 + 1) = A4;
		*(a2 + 0 + lda) = B7;
		*(a2 + 1 + lda) = B8;
		*(b2 + 0 + lda) = A7;
		*(b2 + 1 + lda) = A8;
	      }
	  } else 
	    if (b1 == a2) {
	      if (b2 != a1) {
		if (b2 == a2) {
		  *(a1 + 0) = A3;
		  *(a1 + 1) = A4;
		  *(a2 + 0) = A1;
		  *(a2 + 1) = A2;
		  *(a1 + 0 + lda) = A7;
		  *(a1 + 1 + lda) = A8;
		  *(a2 + 0 + lda) = A5;
		  *(a2 + 1 + lda) = A6;
		} else {
		  *(a1 + 0) = A3;
		  *(a1 + 1) = A4;
		  *(a2 + 0) = B3;
		  *(a2 + 1) = B4;
		  *(b2 + 0) = A1;
		  *(b2 + 1) = A2;
		  *(a1 + 0 + lda) = A7;
		  *(a1 + 1 + lda) = A8;
		  *(a2 + 0 + lda) = B7;
		  *(a2 + 1 + lda) = B8;
		  *(b2 + 0 + lda) = A5;
		  *(b2 + 1 + lda) = A6;
		}
	      }
	    } else {
	      if (b2 == a1) {
		*(a1 + 0) = A3;
		*(a1 + 1) = A4;
		*(a2 + 0) = B1;
		*(a2 + 1) = B2;
		*(b1 + 0) = A1;
		*(b1 + 1) = A2;
		*(a1 + 0 + lda) = A7;
		*(a1 + 1 + lda) = A8;
		*(a2 + 0 + lda) = B5;
		*(a2 + 1 + lda) = B6;
		*(b1 + 0 + lda) = A5;
		*(b1 + 1 + lda) = A6;
	      } else 
		if (b2 == a2) {
		  *(a1 + 0) = B1;
		  *(a1 + 1) = B2;
		  *(b1 + 0) = A1;
		  *(b1 + 1) = A2;
		  *(a1 + 0 + lda) = B5;
		  *(a1 + 1 + lda) = B6;
		  *(b1 + 0 + lda) = A5;
		  *(b1 + 1 + lda) = A6;
		} else 
		  if (b2 == b1) {
		    *(a1 + 0) = B1;
		    *(a1 + 1) = B2;
		    *(a2 + 0) = A1;
		    *(a2 + 1) = A2;
		    *(b1 + 0) = A3;
		    *(b1 + 1) = A4;
		    *(a1 + 0 + lda) = B5;
		    *(a1 + 1 + lda) = B6;
		    *(a2 + 0 + lda) = A5;
		    *(a2 + 1 + lda) = A6;
		    *(b1 + 0 + lda) = A7;
		    *(b1 + 1 + lda) = A8;
		  } 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;
		    *(a1 + 0 + lda) = B5;
		    *(a1 + 1 + lda) = B6;
		    *(a2 + 0 + lda) = B7;
		    *(a2 + 1 + lda) = B8;
		    *(b1 + 0 + lda) = A5;
		    *(b1 + 1 + lda) = A6;
		    *(b2 + 0 + lda) = A7;
		    *(b2 + 1 + lda) = A8;
		  }
	    }
	  
	  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);
	A3 = *(a1 + 0 + lda);
	A4 = *(a1 + 1 + lda);
	B1 = *(b1 + 0);
	B2 = *(b1 + 1);
	B3 = *(b1 + 0 + lda);
	B4 = *(b1 + 1 + lda);
	*(a1 + 0) = B1;
	*(a1 + 1) = B2;
	*(a1 + 0 + lda) = B3;
	*(a1 + 1 + lda) = B4;
	*(b1 + 0) = A1;
	*(b1 + 1) = A2;
	*(b1 + 0 + lda) = A3;
	*(b1 + 1 + lda) = A4;
      }
      
      a += 2 * lda;
      
      j --;
    } while (j > 0);
  }

  if (n & 1) {
    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 {
	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;
    }
  }

  return 0;
}