Centre Blaise Pascal » HPL sur GPU

/* 

 * -- High Performance Computing Linpack Benchmark (HPL)                

 *    HPL - 2.0 - September 10, 2008                          

 *    Antoine P. Petitet                                                

 *    University of Tennessee, Knoxville                                

 *    Innovative Computing Laboratory                                 

 *    (C) Copyright 2000-2008 All Rights Reserved                       

 *                                                                      

 * -- Copyright notice and Licensing terms:                             

 *                                                                      

 * 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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 * 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

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 *                                                                      

 * 3. All  advertising  materials  mentioning  features  or  use of this

 * software must display the following acknowledgement:                 

 * This  product  includes  software  developed  at  the  University  of

 * Tennessee, Knoxville, Innovative Computing Laboratory.             

 *                                                                      

 * 4. The name of the  University,  the name of the  Laboratory,  or the

 * names  of  its  contributors  may  not  be used to endorse or promote

 * products  derived   from   this  software  without  specific  written

 * permission.                                                          

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 * -- Disclaimer:                                                       

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 * THIS  SOFTWARE  IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,  INCLUDING,  BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

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 * ---------------------------------------------------------------------

 */ 

/*

 * Include files

 */

#include "hpl.h"

#ifndef HPL_dscal

#ifdef STDC_HEADERS

void HPL_dscal

(

   const int                        N,

   const double                     ALPHA,

   double *                         X,

   const int                        INCX

)

#else

void HPL_dscal

( N, ALPHA, X, INCX )

   const int                        N;

   const double                     ALPHA;

   double *                         X;

   const int                        INCX;

#endif

{

/* 

 * Purpose

 * =======

 *

 * HPL_dscal scales the vector x by alpha.

 * 

 *

 * Arguments

 * =========

 *

 * N       (local input)                 const int

 *         On entry, N specifies the length of the vector x. N  must  be

 *         at least zero.

 *

 * ALPHA   (local input)                 const double

 *         On entry, ALPHA specifies the scalar alpha.   When  ALPHA  is

 *         supplied as zero, then the entries of the incremented array X

 *         need not be set on input.

 *

 * X       (local input/output)          double *

 *         On entry,  X  is an incremented array of dimension  at  least

 *         ( 1 + ( n - 1 ) * abs( INCX ) )  that  contains the vector x.

 *         On exit, the entries of the incremented array  X  are  scaled

 *         by the scalar alpha.

 *

 * INCX    (local input)                 const int

 *         On entry, INCX specifies the increment for the elements of X.

 *         INCX must not be zero.

 *

 * ---------------------------------------------------------------------

 */ 

#ifdef HPL_CALL_CBLAS

   cblas_dscal( N, ALPHA, X, INCX );

#endif

#ifdef HPL_CALL_VSIPL

   register double           x0, x1, x2, x3, x4, x5, x6, x7;

   register const double     alpha = ALPHA;

   const double              * StX;

   register int              i;

   int                       nu;

   const int                 incX2 = 2 * INCX, incX3 = 3 * INCX,

                             incX4 = 4 * INCX, incX5 = 5 * INCX,

                             incX6 = 6 * INCX, incX7 = 7 * INCX,

                             incX8 = 8 * INCX;

   if( ( N > 0 ) && ( alpha != HPL_rone ) )

   {

      if( alpha == HPL_rzero )

      {

         if( ( nu = ( N >> 3 ) << 3 ) != 0 )

         {

            StX = (double *)X + nu * INCX;

            do

            {

               (*X)     = HPL_rzero; X[incX4] = HPL_rzero;

               X[INCX ] = HPL_rzero; X[incX5] = HPL_rzero;

               X[incX2] = HPL_rzero; X[incX6] = HPL_rzero;

               X[incX3] = HPL_rzero; X[incX7] = HPL_rzero; X += incX8;

            } while( X != StX );

         }

         for( i = N - nu; i != 0; i-- ) { *X = HPL_rzero; X += INCX; }

      }

      else

      {

         if( ( nu = ( N >> 3 ) << 3 ) != 0 )

         {

            StX = X + nu * INCX;

            do

            {

               x0 = (*X);     x4 = X[incX4]; x1 = X[INCX ]; x5 = X[incX5];

               x2 = X[incX2]; x6 = X[incX6]; x3 = X[incX3]; x7 = X[incX7];

               x0 *= alpha;   x4 *= alpha;   x1 *= alpha;   x5 *= alpha;

               x2 *= alpha;   x6 *= alpha;   x3 *= alpha;   x7 *= alpha;

               (*X)     = x0; X[incX4] = x4; X[INCX ] = x1; X[incX5] = x5;

               X[incX2] = x2; X[incX6] = x6; X[incX3] = x3; X[incX7] = x7;

               X  += incX8;

            } while( X != StX );

         }

         for( i = N - nu; i != 0; i-- )

         { x0 = (*X); x0 *= alpha; *X = x0; X += INCX; }

      }

   }

#endif

#ifdef HPL_CALL_FBLAS

   double                    alpha = ALPHA;

#ifdef HPL_USE_F77_INTEGER_DEF

   const F77_INTEGER         F77N = N, F77incx = INCX;

#else

#define F77N                 N

#define F77incx              INCX

#endif

   F77dscal( &F77N, &alpha, X, &F77incx );

#endif

#ifdef HPL_CALL_CUBLAS

   double                    alpha = ALPHA;

#define CUBLASN                 N

#define CUBLASincx              INCX

   CUBLAS_DSCAL( &CUBLASN, &alpha, X, &CUBLASincx );

#endif

/*

 * End of HPL_dscal

 */

}

#endif