atl_cger1_2x1p.c

来自「基于Blas CLapck的.用过的人知道是干啥的」· C语言 代码 · 共 128 行

/*
 *             Automatically Tuned Linear Algebra Software v3.8.0
 *                    (C) Copyright 1999 R. Clint Whaley
 *
 * 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.
 *   3. The name of the ATLAS group or the names of its contributers may
 *      not be used to endorse or promote products derived from this
 *      software without specific written permission.
 *
 * 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 A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE ATLAS GROUP OR ITS 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.
 *
 */

#include "atlas_misc.h"
#include "atlas_lvl2.h"
#include "atlas_prefetch.h"

static void ger1(const int M, const int N, const SCALAR alpha, const TYPE *X,
                 const TYPE *Y, const int incY, TYPE *A, const int lda)
{
   const int mr = M - ((M>>1)<<1);
   const int incA = ((lda-M+mr)<<1), incy = incY+incY, lda2=lda+lda;
   const TYPE *stY = Y + N*incy, *stX = X + ((M>>1)<<2), *x;
   register TYPE ry, iy, rx, ix, ra, ia;
   if ( N > 0)
   {
      if (M > 1)
      {
         do
         {
            #ifdef Conj_
               ry = *Y;
               iy = -Y[1];
            #else
               ry = *Y;
               iy = Y[1];
            #endif
            x = X;
            do
            {
               rx = *x; ix = x[1];
               ra = *A; ia = A[1];
               ra += rx * ry; ATL_pfl1W(A+16);
               ia += rx * iy;
               ra -= ix * iy;
               ia += ix * ry;
               *A = ra;
               A[1] = ia;
               rx = x[2]; ix = x[3]; x += 4;
               ra = A[2]; ia = A[3];
               ra += rx * ry;
               ia += rx * iy;
               ra -= ix * iy;
               ia += ix * ry;
               A[2] = ra;
               A[3] = ia; A += 4;
            }
            while (x != stX);
            if (!mr) goto L1;
            else
            {
               rx = *x; ix = x[1];
               ra = *A; ia = A[1];
               ra += rx * ry;
               ra -= ix * iy;
               ia += rx * iy;
               ia += ix * ry;
               *A = ra;
               A[1] = ia;
            }
L1:         Y += incy;
            A += incA;
         }
         while (Y != stY);
      }
      else if (M == 1)
      {
         #ifdef Conj_
            rx = *X; ix = X[1];
            do
            {
               ry = *Y; iy = Y[1];
               ra = *A; ia = A[1];
               ra += rx * ry;
               ia -= rx * iy;
               ra += ix * iy;
               ia += ix * ry;
               *A = ra;
               A[1] = ia;
               Y += incy;
               A += lda2;
            }
            while (Y != stY);
         #else
            Mjoin(PATL,axpy)(N, X, Y, incY, A, lda);
         #endif
      }
   }
}
#ifdef Conj_
void Mjoin(PATL,ger1c_a1_x1_yX)
#else
void Mjoin(PATL,ger1u_a1_x1_yX)
#endif
   (const int M, const int N, const SCALAR alpha, const TYPE *X, const int incX,
    const TYPE *Y, const int incY, TYPE *A, const int lda)
{
   ger1(M, N, alpha, X, Y, incY, A, lda);
}