cblas_zgerc.c

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/*
 * cblas_zgerc.c
 * The program is a C interface to zgerc.
 *
 * Keita Teranishi  5/20/98
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include "cblas.h"
#include "cblas_f77.h"
void cblas_zgerc(const CBLAS_LAYOUT layout, const CBLAS_INT M, const CBLAS_INT N,
                 const void *alpha, const void *X, const CBLAS_INT incX,
                 const void *Y, const CBLAS_INT incY, void *A, const CBLAS_INT lda)
{
#ifdef F77_INT
   F77_INT F77_M=M, F77_N=N, F77_lda=lda, F77_incX=incX, F77_incY=incY;
#else
   #define F77_M M
   #define F77_N N
   #define F77_incX incX
   #define F77_incY incy
   #define F77_lda lda
#endif
 
   CBLAS_INT n, i, tincy, incy=incY;
   double *y=(double *)Y, *yy=(double *)Y, *ty, *st;
 
   extern int CBLAS_CallFromC;
   extern int RowMajorStrg;
   RowMajorStrg = 0;
 
   CBLAS_CallFromC = 1;
   if (layout == CblasColMajor)
   {
      F77_zgerc( &F77_M, &F77_N, alpha, X, &F77_incX, Y, &F77_incY, A,
                      &F77_lda);
   }  else if (layout == CblasRowMajor)
   {
      RowMajorStrg = 1;
      if (N > 0)
      {
         n = N << 1;
         y = malloc(n*sizeof(double));
 
         ty = y;
         if( incY > 0 ) {
            i = incY << 1;
            tincy = 2;
            st= y+n;
         } else {
            i = incY *(-2);
            tincy = -2;
            st = y-2;
            y +=(n-2);
         }
         do
         {
            *y = *yy;
            y[1] = -yy[1];
            y += tincy ;
            yy += i;
         }
         while (y != st);
         y = ty;
 
         #ifdef F77_INT
            F77_incY = 1;
         #else
            incy = 1;
         #endif
      }
      else y = (double *) Y;
 
      F77_zgeru( &F77_N, &F77_M, alpha, y, &F77_incY, X, &F77_incX, A,
                      &F77_lda);
      if(Y!=y)
         free(y);
 
   } else cblas_xerbla(1, "cblas_zgerc", "Illegal layout setting, %d\n", layout);
   CBLAS_CallFromC = 0;
   RowMajorStrg = 0;
   return;
}