cblas_chpr2()

void cblas_chpr2	(	CBLAS_LAYOUT	layout,
		CBLAS_UPLO	Uplo,
		const CBLAS_INDEX	N,
		const void *	alpha,
		const void *	X,
		const CBLAS_INDEX	incX,
		const void *	Y,
		const CBLAS_INDEX	incY,
		void *	Ap
	)

Definition at line 12 of file cblas_chpr2.c.

{
   char UL;
#ifdef F77_CHAR
   F77_CHAR F77_UL;
#else
   #define F77_UL &UL
#endif
 
#ifdef F77_INT
   F77_INT F77_N=N,  F77_incX=incX, F77_incY=incY;
#else
   #define F77_N N
   #define F77_incX incx
   #define F77_incY incy
#endif
   CBLAS_INDEX n, i, j, tincx, tincy, incx=incX, incy=incY;
   float *x=(float *)X, *xx=(float *)X, *y=(float *)Y,
         *yy=(float *)Y, *tx, *ty, *stx, *sty;
 
   extern int CBLAS_CallFromC;
   extern int RowMajorStrg;
   RowMajorStrg = 0;
 
   CBLAS_CallFromC = 1;
   if (layout == CblasColMajor)
   {
      if (Uplo == CblasLower) UL = 'L';
      else if (Uplo == CblasUpper) UL = 'U';
      else
      {
         cblas_xerbla(2, "cblas_chpr2","Illegal Uplo setting, %d\n",Uplo );
         CBLAS_CallFromC = 0;
         RowMajorStrg = 0;
         return;
      }
      #ifdef F77_CHAR
         F77_UL = C2F_CHAR(&UL);
      #endif
 
      F77_chpr2(F77_UL, &F77_N, alpha, X, &F77_incX, Y, &F77_incY, Ap);
 
   }  else if (layout == CblasRowMajor)
   {
      RowMajorStrg = 1;
      if (Uplo == CblasUpper) UL = 'L';
      else if (Uplo == CblasLower) UL = 'U';
      else
      {
         cblas_xerbla(2, "cblas_chpr2","Illegal Uplo setting, %d\n", Uplo);
         CBLAS_CallFromC = 0;
         RowMajorStrg = 0;
         return;
      }
      #ifdef F77_CHAR
         F77_UL = C2F_CHAR(&UL);
      #endif
      if (N > 0)
      {
         n = N << 1;
         x = malloc(n*sizeof(float));
         y = malloc(n*sizeof(float));
         tx = x;
         ty = y;
         if( incX > 0 ) {
            i = incX << 1 ;
            tincx = 2;
            stx= x+n;
         } else {
            i = incX *(-2);
            tincx = -2;
            stx = x-2;
            x +=(n-2);
         }
 
         if( incY > 0 ) {
            j = incY << 1;
            tincy = 2;
            sty= y+n;
         } else {
            j = incY *(-2);
            tincy = -2;
            sty = y-2;
            y +=(n-2);
         }
 
         do
         {
            *x = *xx;
            x[1] = -xx[1];
            x += tincx ;
            xx += i;
         }
         while (x != stx);
         do
         {
            *y = *yy;
            y[1] = -yy[1];
            y += tincy ;
            yy += j;
         }
         while (y != sty);
 
         x=tx;
         y=ty;
 
         #ifdef F77_INT
            F77_incX = 1;
            F77_incY = 1;
         #else
            incx = 1;
            incy = 1;
         #endif
 
      }  else
      {
         x = (float *) X;
         y = (void  *) Y;
      }
      F77_chpr2(F77_UL, &F77_N, alpha, y, &F77_incY, x, &F77_incX, Ap);
   } else
   {
      cblas_xerbla(1, "cblas_chpr2","Illegal layout setting, %d\n", layout);
      CBLAS_CallFromC = 0;
      RowMajorStrg = 0;
      return;
   }
   if(X!=x)
      free(x);
   if(Y!=y)
      free(y);
   CBLAS_CallFromC = 0;
   RowMajorStrg = 0;
   return;
}

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