cblas_sgemv.c

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/*
 *
 * cblas_sgemv.c
 * This program is a C interface to sgemv.
 * Written by Keita Teranishi
 * 4/6/1998
 * 
 */
#include "cblas.h"
#include "cblas_f77.h"
void cblas_sgemv(const CBLAS_LAYOUT layout,
                 const CBLAS_TRANSPOSE TransA, const int M, const int N,
                 const float alpha, const float  *A, const int lda,
                 const float  *X, const int incX, const float beta,
                 float  *Y, const int incY)
{
   char TA;
#ifdef F77_CHAR
   F77_CHAR F77_TA;
#else
   #define F77_TA &TA   
#endif
#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_lda lda
   #define F77_incX incX
   #define F77_incY incY
#endif

   extern int CBLAS_CallFromC;
   extern int RowMajorStrg;
   RowMajorStrg = 0;

   CBLAS_CallFromC = 1;
   if (layout == CblasColMajor)
   {
      if (TransA == CblasNoTrans) TA = 'N';
      else if (TransA == CblasTrans) TA = 'T';
      else if (TransA == CblasConjTrans) TA = 'C';
      else 
      {
         cblas_xerbla(2, "cblas_sgemv","Illegal TransA setting, %d\n", TransA);
         CBLAS_CallFromC = 0;
         RowMajorStrg = 0;
      }
      #ifdef F77_CHAR
         F77_TA = C2F_CHAR(&TA);
      #endif
      F77_sgemv(F77_TA, &F77_M, &F77_N, &alpha, A, &F77_lda, X, &F77_incX, 
                &beta, Y, &F77_incY);
   }
   else if (layout == CblasRowMajor)
   {
      RowMajorStrg = 1;
      if (TransA == CblasNoTrans) TA = 'T';
      else if (TransA == CblasTrans) TA = 'N';
      else if (TransA == CblasConjTrans) TA = 'N';
      else 
      {
         cblas_xerbla(2, "cblas_sgemv", "Illegal TransA setting, %d\n", TransA);
         CBLAS_CallFromC = 0;
         RowMajorStrg = 0;
         return;
      }
      #ifdef F77_CHAR
         F77_TA = C2F_CHAR(&TA);
      #endif
      F77_sgemv(F77_TA, &F77_N, &F77_M, &alpha, A, &F77_lda, X,
                &F77_incX, &beta, Y, &F77_incY);
   }
   else cblas_xerbla(1, "cblas_sgemv", "Illegal layout setting, %d\n", layout);
   CBLAS_CallFromC = 0;
   RowMajorStrg = 0;
   return;
}