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"
cblas_ctbmv(const enum CBLAS_ORDER order,const enum CBLAS_UPLO Uplo,const enum CBLAS_TRANSPOSE TransA,const enum CBLAS_DIAG Diag,const int N,const int K,const void * A,const int lda,void * X,const int incX)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