cblas_dgemm.c

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/*
 *
 * cblas_dgemm.c
 * This program is a C interface to dgemm.
 * Written by Keita Teranishi
 * 4/8/1998
 *
 */
 
#include "cblas.h"
#include "cblas_f77.h"
void cblas_dgemm(const CBLAS_LAYOUT layout, const CBLAS_TRANSPOSE TransA,
                 const CBLAS_TRANSPOSE TransB, const CBLAS_INT M, const CBLAS_INT N,
                 const CBLAS_INT K, const double alpha, const double  *A,
                 const CBLAS_INT lda, const double  *B, const CBLAS_INT ldb,
                 const double beta, double  *C, const CBLAS_INT ldc)
{
   char TA, TB;
#ifdef F77_CHAR
   F77_CHAR F77_TA, F77_TB;
#else
   #define F77_TA &TA
   #define F77_TB &TB
#endif
 
#ifdef F77_INT
   F77_INT F77_M=M, F77_N=N, F77_K=K, F77_lda=lda, F77_ldb=ldb;
   F77_INT F77_ldc=ldc;
#else
   #define F77_M M
   #define F77_N N
   #define F77_K K
   #define F77_lda lda
   #define F77_ldb ldb
   #define F77_ldc ldc
#endif
 
   extern int CBLAS_CallFromC;
   extern int RowMajorStrg;
   RowMajorStrg = 0;
   CBLAS_CallFromC = 1;
 
   if( layout == CblasColMajor )
   {
      if(TransA == CblasTrans) TA='T';
      else if ( TransA == CblasConjTrans ) TA='C';
      else if ( TransA == CblasNoTrans )   TA='N';
      else
      {
         cblas_xerbla(2, "cblas_dgemm","Illegal TransA setting, %d\n", TransA);
         CBLAS_CallFromC = 0;
         RowMajorStrg = 0;
         return;
      }
 
      if(TransB == CblasTrans) TB='T';
      else if ( TransB == CblasConjTrans ) TB='C';
      else if ( TransB == CblasNoTrans )   TB='N';
      else
      {
         cblas_xerbla(3, "cblas_dgemm","Illegal TransB setting, %d\n", TransB);
         CBLAS_CallFromC = 0;
         RowMajorStrg = 0;
         return;
      }
 
      #ifdef F77_CHAR
         F77_TA = C2F_CHAR(&TA);
         F77_TB = C2F_CHAR(&TB);
      #endif
 
      F77_dgemm(F77_TA, F77_TB, &F77_M, &F77_N, &F77_K, &alpha, A,
       &F77_lda, B, &F77_ldb, &beta, C, &F77_ldc);
   } else if (layout == CblasRowMajor)
   {
      RowMajorStrg = 1;
      if(TransA == CblasTrans) TB='T';
      else if ( TransA == CblasConjTrans ) TB='C';
      else if ( TransA == CblasNoTrans )   TB='N';
      else
      {
         cblas_xerbla(2, "cblas_dgemm","Illegal TransA setting, %d\n", TransA);
         CBLAS_CallFromC = 0;
         RowMajorStrg = 0;
         return;
      }
      if(TransB == CblasTrans) TA='T';
      else if ( TransB == CblasConjTrans ) TA='C';
      else if ( TransB == CblasNoTrans )   TA='N';
      else
      {
         cblas_xerbla(2, "cblas_dgemm","Illegal TransB setting, %d\n", TransB);
         CBLAS_CallFromC = 0;
         RowMajorStrg = 0;
         return;
      }
      #ifdef F77_CHAR
         F77_TA = C2F_CHAR(&TA);
         F77_TB = C2F_CHAR(&TB);
      #endif
 
      F77_dgemm(F77_TA, F77_TB, &F77_N, &F77_M, &F77_K, &alpha, B,
                  &F77_ldb, A, &F77_lda, &beta, C, &F77_ldc);
   }
   else  cblas_xerbla(1, "cblas_dgemm", "Illegal layout setting, %d\n", layout);
   CBLAS_CallFromC = 0;
   RowMajorStrg = 0;
   return;
}