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      1 /*
      2  * cblas_ctbmv.c
      3  * The program is a C interface to ctbmv.
      4  *
      5  * Keita Teranishi  5/20/98
      6  *
      7  */
      8 #include "cblas.h"
      9 #include "cblas_f77.h"
     10 void cblas_ctbmv(const enum CBLAS_ORDER order, const enum CBLAS_UPLO Uplo,
     11                  const enum CBLAS_TRANSPOSE TransA, const enum CBLAS_DIAG Diag,
     12                  const int N, const int K, const void  *A, const int lda,
     13                  void  *X, const int incX)
     14 {
     15    char TA;
     16    char UL;
     17    char DI;
     18 #ifdef F77_CHAR
     19    F77_CHAR F77_TA, F77_UL, F77_DI;
     20 #else
     21    #define F77_TA &TA
     22    #define F77_UL &UL
     23    #define F77_DI &DI
     24 #endif
     25 #ifdef F77_INT
     26    F77_INT F77_N=N, F77_lda=lda, F77_K=K, F77_incX=incX;
     27 #else
     28    #define F77_N N
     29    #define F77_K K
     30    #define F77_lda lda
     31    #define F77_incX incX
     32 #endif
     33    int n, i=0, tincX;
     34    float *st=0, *x=(float *)X;
     35    extern int CBLAS_CallFromC;
     36    extern int RowMajorStrg;
     37    RowMajorStrg = 0;
     38 
     39    CBLAS_CallFromC = 1;
     40    if (order == CblasColMajor)
     41    {
     42       if (Uplo == CblasUpper) UL = 'U';
     43       else if (Uplo == CblasLower) UL = 'L';
     44       else
     45       {
     46          cblas_xerbla(2, "cblas_ctbmv","Illegal Uplo setting, %d\n", Uplo);
     47          CBLAS_CallFromC = 0;
     48          RowMajorStrg = 0;
     49          return;
     50       }
     51       if (TransA == CblasNoTrans) TA = 'N';
     52       else if (TransA == CblasTrans) TA = 'T';
     53       else if (TransA == CblasConjTrans) TA = 'C';
     54       else
     55       {
     56          cblas_xerbla(3, "cblas_ctbmv","Illegal TransA setting, %d\n", TransA);
     57          CBLAS_CallFromC = 0;
     58          RowMajorStrg = 0;
     59          return;
     60       }
     61       if (Diag == CblasUnit) DI = 'U';
     62       else if (Diag == CblasNonUnit) DI = 'N';
     63       else
     64       {
     65          cblas_xerbla(4, "cblas_ctbmv","Illegal Diag setting, %d\n", Diag);
     66          CBLAS_CallFromC = 0;
     67          RowMajorStrg = 0;
     68          return;
     69       }
     70       #ifdef F77_CHAR
     71          F77_UL = C2F_CHAR(&UL);
     72          F77_TA = C2F_CHAR(&TA);
     73          F77_DI = C2F_CHAR(&DI);
     74       #endif
     75       F77_ctbmv( F77_UL, F77_TA, F77_DI, &F77_N, &F77_K, A, &F77_lda, X,
     76                       &F77_incX);
     77    }
     78    else if (order == CblasRowMajor)
     79    {
     80       RowMajorStrg = 1;
     81       if (Uplo == CblasUpper) UL = 'L';
     82       else if (Uplo == CblasLower) UL = 'U';
     83       else
     84       {
     85          cblas_xerbla(2, "cblas_ctbmv","Illegal Uplo setting, %d\n", Uplo);
     86          CBLAS_CallFromC = 0;
     87          RowMajorStrg = 0;
     88          return;
     89       }
     90 
     91       if (TransA == CblasNoTrans) TA = 'T';
     92       else if (TransA == CblasTrans) TA = 'N';
     93       else if (TransA == CblasConjTrans)
     94       {
     95          TA = 'N';
     96          if ( N > 0)
     97          {
     98             if(incX > 0)
     99                tincX = incX;
    100             else
    101                tincX = -incX;
    102             i = tincX << 1;
    103             n = i * N;
    104             x++;
    105             st = x + n;
    106             do
    107             {
    108                *x = -(*x);
    109                x+= i;
    110             }
    111             while (x != st);
    112             x -= n;
    113          }
    114       }
    115       else
    116       {
    117          cblas_xerbla(3, "cblas_ctbmv","Illegal TransA setting, %d\n", TransA);
    118          CBLAS_CallFromC = 0;
    119          RowMajorStrg = 0;
    120          return;
    121       }
    122 
    123       if (Diag == CblasUnit) DI = 'U';
    124       else if (Diag == CblasNonUnit) DI = 'N';
    125       else
    126       {
    127          cblas_xerbla(4, "cblas_ctbmv","Illegal Uplo setting, %d\n", Uplo);
    128          CBLAS_CallFromC = 0;
    129          RowMajorStrg = 0;
    130          return;
    131       }
    132       #ifdef F77_CHAR
    133          F77_UL = C2F_CHAR(&UL);
    134          F77_TA = C2F_CHAR(&TA);
    135          F77_DI = C2F_CHAR(&DI);
    136       #endif
    137 
    138       F77_ctbmv( F77_UL, F77_TA, F77_DI, &F77_N, &F77_K, A, &F77_lda, X,
    139                       &F77_incX);
    140 
    141       if (TransA == CblasConjTrans)
    142       {
    143          if (N > 0)
    144          {
    145             do
    146             {
    147                *x = -(*x);
    148                x += i;
    149             }
    150             while (x != st);
    151          }
    152       }
    153    }
    154    else cblas_xerbla(1, "cblas_ctbmv", "Illegal Order setting, %d\n", order);
    155    CBLAS_CallFromC = 0;
    156    RowMajorStrg = 0;
    157    return;
    158 }
    159