/*********************************************************************/
/* 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:                                               */
/*                                                                   */
/*   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    */
/*    MERCHANTABILITY  AND FITNESS FOR  A PARTICULAR  PURPOSE ARE    */
/*    DISCLAIMED.  IN  NO EVENT SHALL THE UNIVERSITY  OF TEXAS AT    */
/*    AUSTIN OR CONTRIBUTORS BE  LIABLE FOR ANY DIRECT, INDIRECT,    */
/*    INCIDENTAL,  SPECIAL, EXEMPLARY,  OR  CONSEQUENTIAL DAMAGES    */
/*    (INCLUDING, BUT  NOT LIMITED TO,  PROCUREMENT OF SUBSTITUTE    */
/*    GOODS  OR  SERVICES; LOSS  OF  USE,  DATA,  OR PROFITS;  OR    */
/*    BUSINESS INTERRUPTION) HOWEVER CAUSED  AND ON ANY THEORY OF    */
/*    LIABILITY, WHETHER  IN CONTRACT, STRICT  LIABILITY, OR TORT    */
/*    (INCLUDING NEGLIGENCE OR OTHERWISE)  ARISING IN ANY WAY OUT    */
/*    OF  THE  USE OF  THIS  SOFTWARE,  EVEN  IF ADVISED  OF  THE    */
/*    POSSIBILITY OF SUCH DAMAGE.                                    */
/*                                                                   */
/* The views and conclusions contained in the software and           */
/* 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)
#define a4	(a3 + 1)
#define a6	(a5 + 1)
#define a8	(a7 + 1)
#define a10	(a9 + 1)
#define a12	(a11 + 1)
#define a14	(a13 + 1)
#define a16	(a15 + 1)
#else
#define a2	(a1 - 1)
#define a4	(a3 - 1)
#define a6	(a5 - 1)
#define a8	(a7 - 1)
#define a10	(a9 - 1)
#define a12	(a11 - 1)
#define a14	(a13 - 1)
#define a16	(a15 - 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, *a3, *a5, *a7;
  FLOAT *a9, *a11, *a13, *a15;
  FLOAT *b1, *b2, *b3, *b4;
  FLOAT *b5, *b6, *b7, *b8;
  FLOAT *b9, *b10, *b11, *b12;
  FLOAT *b13, *b14, *b15, *b16;
  FLOAT A1, A2, B1, B2, A3, A4, B3, B4;
  FLOAT A5, A6, B5, B6, A7, A8, B7, B8;
  FLOAT A9, A10, B9, B10, A11, A12, B11, B12;
  FLOAT A13, A14, B13, B14, A15, A16, B15, B16;
  
  a--;
  k1 --;

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

  if (n  <= 0) return 0;

  j = (n >> 3);
  if (j > 0) {
    do {
      piv = ipiv;

#ifndef MINUS
      a1 = a + k1 + 1;
#else
      a1 = a + k2;
#endif
      
      a3  = a1 + 1 * lda;
      a5  = a1 + 2 * lda;
      a7  = a1 + 3 * lda;
      a9  = a1 + 4 * lda;
      a11 = a1 + 5 * lda;
      a13 = a1 + 6 * lda;
      a15 = a1 + 7 * lda;

      ip1 = *piv;
      piv += incx;
      ip2 = *piv;
      piv += incx;
      
      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;

      b9  = b1 + 4 * lda;
      b10 = b2 + 4 * lda;
      b11 = b1 + 5 * lda;
      b12 = b2 + 5 * lda;
      b13 = b1 + 6 * lda;
      b14 = b2 + 6 * lda;
      b15 = b1 + 7 * lda;
      b16 = b2 + 7 * lda;

      i = ((k2 - k1) >> 1);
      
      if (i > 0) {
	do {
	  B1 = *b1;
	  B2 = *b2;
	  B3 = *b3;
	  B4 = *b4;
	  B5 = *b5;
	  B6 = *b6;
	  B7 = *b7;
	  B8 = *b8;
	  
	  B9  = *b9;
	  B10 = *b10;
	  B11 = *b11;
	  B12 = *b12;
	  B13 = *b13;
	  B14 = *b14;
	  B15 = *b15;
	  B16 = *b16;
	  
	  A1 = *a1;
	  A2 = *a2;
	  A3 = *a3;
	  A4 = *a4;
	  A5 = *a5;
	  A6 = *a6;
	  A7 = *a7;
	  A8 = *a8;

	  A9  = *a9;
	  A10 = *a10;
	  A11 = *a11;
	  A12 = *a12;
	  A13 = *a13;
	  A14 = *a14;
	  A15 = *a15;
	  A16 = *a16;

	  ip1 = *piv;
	  piv += incx;
	  ip2 = *piv;
	  piv += incx;
	  
	if (b1 == a1) {
	  if (b2 == a1) {
	    *a1  = A2;
	    *a2  = A1;
	    *a3  = A4;
	    *a4  = A3;
	    *a5  = A6;
	    *a6  = A5;
	    *a7  = A8;
	    *a8  = A7;
	    *a9  = A10;
	    *a10 = A9;
	    *a11 = A12;
	    *a12 = A11;
	    *a13 = A14;
	    *a14 = A13;
	    *a15 = A16;
	    *a16 = A15;
	  } else 
	    if (b2 != a2) {
	      *a2 = B2;
	      *b2 = A2;
	      *a4 = B4;
	      *b4 = A4;
	      *a6 = B6;
	      *b6 = A6;
	      *a8 = B8;
	      *b8 = A8;

	      *a10 = B10;
	      *b10 = A10;
	      *a12 = B12;
	      *b12 = A12;
	      *a14 = B14;
	      *b14 = A14;
	      *a16 = B16;
	      *b16 = A16;
	    }
	} else 
	  if (b1 == a2) {
	    if (b2 != a1) {
	      if (b2 == a2) {
		*a1 = A2;
		*a2 = A1;
		*a3 = A4;
		*a4 = A3;
		*a5 = A6;
		*a6 = A5;
		*a7 = A8;
		*a8 = A7;

		*a9  = A10;
		*a10 = A9;
		*a11 = A12;
		*a12 = A11;
		*a13 = A14;
		*a14 = A13;
		*a15 = A16;
		*a16 = A15;
	      } else {
		*a1 = A2;
		*a2 = B2;
		*b2 = A1;
		*a3 = A4;
		*a4 = B4;
		*b4 = A3;
		*a5 = A6;
		*a6 = B6;
		*b6 = A5;
		*a7 = A8;
		*a8 = B8;
		*b8 = A7;

		*a9  = A10;
		*a10 = B10;
		*b10 = A9;
		*a11 = A12;
		*a12 = B12;
		*b12 = A11;
		*a13 = A14;
		*a14 = B14;
		*b14 = A13;
		*a15 = A16;
		*a16 = B16;
		*b16 = A15;
	      }
	    }
	  } else {
	    if (b2 == a1) {
	      *a1 = A2;
	      *a2 = B1;
	      *b1 = A1;
	      *a3 = A4;
	      *a4 = B3;
	      *b3 = A3;
	      *a5 = A6;
	      *a6 = B5;
	      *b5 = A5;
	      *a7 = A8;
	      *a8 = B7;
	      *b7 = A7;

	      *a9  = A10;
	      *a10 = B9;
	      *b9  = A9;
	      *a11 = A12;
	      *a12 = B11;
	      *b11 = A11;
	      *a13 = A14;
	      *a14 = B13;
	      *b13 = A13;
	      *a15 = A16;
	      *a16 = B15;
	      *b15 = A15;
	    } else 
	      if (b2 == a2) {
		*a1 = B1;
		*b1 = A1;
		*a3 = B3;
		*b3 = A3;
		*a5 = B5;
		*b5 = A5;
		*a7 = B7;
		*b7 = A7;

		*a9  = B9;
		*b9  = A9;
		*a11 = B11;
		*b11 = A11;
		*a13 = B13;
		*b13 = A13;
		*a15 = B15;
		*b15 = A15;
	      } else 
		if (b2 == b1) {
		  *a1 = B1;
		  *a2 = A1;
		  *b1 = A2;
		  *a3 = B3;
		  *a4 = A3;
		  *b3 = A4;
		  *a5 = B5;
		  *a6 = A5;
		  *b5 = A6;
		  *a7 = B7;
		  *a8 = A7;
		  *b7 = A8;

		  *a9  = B9;
		  *a10 = A9;
		  *b9  = A10;
		  *a11 = B11;
		  *a12 = A11;
		  *b11 = A12;
		  *a13 = B13;
		  *a14 = A13;
		  *b13 = A14;
		  *a15 = B15;
		  *a16 = A15;
		  *b15 = A16;
		} else {
		  *a1 = B1;
		  *a2 = B2;
		  *b1 = A1;
		  *b2 = A2;
		  *a3 = B3;
		  *a4 = B4;
		  *b3 = A3;
		  *b4 = A4;
		  *a5 = B5;
		  *a6 = B6;
		  *b5 = A5;
		  *b6 = A6;
		  *a7 = B7;
		  *a8 = B8;
		  *b7 = A7;
		  *b8 = A8;

		  *a9  = B9;
		  *a10 = B10;
		  *b9  = A9;
		  *b10 = A10;
		  *a11 = B11;
		  *a12 = B12;
		  *b11 = A11;
		  *b12 = A12;
		  *a13 = B13;
		  *a14 = B14;
		  *b13 = A13;
		  *b14 = A14;
		  *a15 = B15;
		  *a16 = B16;
		  *b15 = A15;
		  *b16 = A16;
		}
	  }
	
	  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;
	  
	  b9  = b1 + 4 * lda;
	  b10 = b2 + 4 * lda;
	  b11 = b1 + 5 * lda;
	  b12 = b2 + 5 * lda;
	  b13 = b1 + 6 * lda;
	  b14 = b2 + 6 * lda;
	  b15 = b1 + 7 * lda;
	  b16 = b2 + 7 * lda;

#ifndef MINUS
	  a1 += 2;
	  a3 += 2;
	  a5 += 2;
	  a7 += 2;
	  a9 += 2;
	  a11 += 2;
	  a13 += 2;
	  a15 += 2;
#else
	  a1 -= 2;
	  a3 -= 2;
	  a5 -= 2;
	  a7 -= 2;
	  a9 -= 2;
	  a11 -= 2;
	  a13 -= 2;
	  a15 -= 2;
#endif
	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;

	A9  = *a9;
	B9  = *b9;
	A11 = *a11;
	B11 = *b11;
	A13 = *a13;
	B13 = *b13;
	A15 = *a15;
	B15 = *b15;

	*a1 = B1;
	*b1 = A1;
	*a3 = B3;
	*b3 = A3;
	*a5 = B5;
	*b5 = A5;
	*a7 = B7;
	*b7 = A7;

	*a9  = B9;
	*b9  = A9;
	*a11 = B11;
	*b11 = A11;
	*a13 = B13;
	*b13 = A13;
	*a15 = B15;
	*b15 = A15;
      }
      
      a += 8 * lda;
      
      j --;
    } while (j > 0);
  }

  if (n & 4) {
    piv = ipiv;

#ifndef MINUS
    a1 = a + k1 + 1;
#else
    a1 = a + k2;
#endif
      
    a3 = a1 + 1 * lda;
    a5 = a1 + 2 * lda;
    a7 = a1 + 3 * lda;
    
    ip1 = *piv;
    piv += incx;
    ip2 = *piv;
    piv += incx;
    
    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 {
	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;
	piv += incx;
	ip2 = *piv;
	piv += incx;
	
	if (b1 == a1) {
	  if (b2 == a1) {
	    *a1 = A2;
	    *a2 = A1;
	    *a3 = A4;
	    *a4 = A3;
	    *a5 = A6;
	    *a6 = A5;
	    *a7 = A8;
	    *a8 = A7;
	  } else 
	    if (b2 != a2) {
	      *a2 = B2;
	      *b2 = A2;
	      *a4 = B4;
	      *b4 = A4;
	      *a6 = B6;
	      *b6 = A6;
	      *a8 = B8;
	      *b8 = A8;
	    }
	} else 
	  if (b1 == a2) {
	    if (b2 != a1) {
	      if (b2 == a2) {
		*a1 = A2;
		*a2 = A1;
		*a3 = A4;
		*a4 = A3;
		*a5 = A6;
		*a6 = A5;
		*a7 = A8;
		*a8 = A7;
	      } else {
		*a1 = A2;
		*a2 = B2;
		*b2 = A1;
		*a3 = A4;
		*a4 = B4;
		*b4 = A3;
		*a5 = A6;
		*a6 = B6;
		*b6 = A5;
		*a7 = A8;
		*a8 = B8;
		*b8 = A7;
	      }
	    }
	  } else {
	    if (b2 == a1) {
	      *a1 = A2;
	      *a2 = B1;
	      *b1 = A1;
	      *a3 = A4;
	      *a4 = B3;
	      *b3 = A3;
	      *a5 = A6;
	      *a6 = B5;
	      *b5 = A5;
	      *a7 = A8;
	      *a8 = B7;
	      *b7 = A7;
	    } else 
	      if (b2 == a2) {
		*a1 = B1;
		*b1 = A1;
		*a3 = B3;
		*b3 = A3;
		*a5 = B5;
		*b5 = A5;
		*a7 = B7;
		*b7 = A7;
	      } else 
		if (b2 == b1) {
		  *a1 = B1;
		  *a2 = A1;
		  *b1 = A2;
		  *a3 = B3;
		  *a4 = A3;
		  *b3 = A4;
		  *a5 = B5;
		  *a6 = A5;
		  *b5 = A6;
		  *a7 = B7;
		  *a8 = A7;
		  *b7 = A8;
		} else {
		  *a1 = B1;
		  *a2 = B2;
		  *b1 = A1;
		  *b2 = A2;
		  *a3 = B3;
		  *a4 = B4;
		  *b3 = A3;
		  *b4 = A4;
		  *a5 = B5;
		  *a6 = B6;
		  *b5 = A5;
		  *b6 = A6;
		  *a7 = B7;
		  *a8 = B8;
		  *b7 = A7;
		  *b8 = A8;
		}
	  }
	
	  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;
	  
#ifndef MINUS
	  a1 += 2;
	  a3 += 2;
	  a5 += 2;
	  a7 += 2;
#else
	  a1 -= 2;
	  a3 -= 2;
	  a5 -= 2;
	  a7 -= 2;
#endif
	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;

	*a1 = B1;
	*b1 = A1;
	*a3 = B3;
	*b3 = A3;
	*a5 = B5;
	*b5 = A5;
	*a7 = B7;
	*b7 = A7;
      }
      
      a += 4 * lda;
  }

  if (n & 2) {
    piv = ipiv;

#ifndef MINUS
    a1 = a + k1 + 1;
#else
    a1 = a + k2;
#endif
      
    a3 = a1 + 1 * lda;

    ip1 = *piv;
    piv += incx;
    ip2 = *piv;
    piv += incx;
    
    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;
	piv += incx;
	ip2 = *piv;
	piv += incx;
	
	if (b1 == a1) {
	  if (b2 == a1) {
	    *a1 = A2;
	    *a2 = A1;
	    *a3 = A4;
	    *a4 = A3;
	  } else 
	    if (b2 != a2) {
	      *a2 = B2;
	      *b2 = A2;
	      *a4 = B4;
	      *b4 = A4;
	    }
	} else 
	  if (b1 == a2) {
	    if (b2 != a1) {
	      if (b2 == a2) {
		*a1 = A2;
		*a2 = A1;
		*a3 = A4;
		*a4 = A3;
	      } else {
		*a1 = A2;
		*a2 = B2;
		*b2 = A1;
		*a3 = A4;
		*a4 = B4;
		*b4 = A3;
	      }
	    }
	  } else {
	    if (b2 == a1) {
	      *a1 = A2;
	      *a2 = B1;
	      *b1 = A1;
	      *a3 = A4;
	      *a4 = B3;
	      *b3 = A3;
	    } else 
	      if (b2 == a2) {
		*a1 = B1;
		*b1 = A1;
		*a3 = B3;
		*b3 = A3;
	      } else 
		if (b2 == b1) {
		  *a1 = B1;
		  *a2 = A1;
		  *b1 = A2;
		  *a3 = B3;
		  *a4 = A3;
		  *b3 = A4;
		} else {
		  *a1 = B1;
		  *a2 = B2;
		  *b1 = A1;
		  *b2 = A2;
		  *a3 = B3;
		  *a4 = B4;
		  *b3 = A3;
		  *b4 = A4;
		}
	  }
	
	b1 = a + ip1;
	b2 = a + ip2;
	
	b3 = b1 + 1 * lda;
	b4 = b2 + 1 * lda;
	
#ifndef MINUS
	a1 += 2;
	a3 += 2;
#else
	a1 -= 2;
	a3 -= 2;
#endif
	i --;
      } while (i > 0);
    }
    
    i = ((k2 - k1) & 1);
    
    if (i > 0) {
      A1 = *a1;
      B1 = *b1;
      A3 = *a3;
      B3 = *b3;
      *a1 = B1;
      *b1 = A1;
      *a3 = B3;
      *b3 = A3;
    }
    
    a += 2 * lda;
  }

  if (n & 1) {
    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 {
	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;
    }
  }

  return 0;
}