1 /*
2 * cblas_cgemv.c
3 * The program is a C interface of cgemv
4 *
5 * Keita Teranishi 5/20/98
6 *
7 */
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include "cblas.h"
11 #include "cblas_f77.h"
cblas_cgemv(const CBLAS_LAYOUT layout,const CBLAS_TRANSPOSE TransA,const CBLAS_INDEX M,const CBLAS_INDEX N,const void * alpha,const void * A,const CBLAS_INDEX lda,const void * X,const CBLAS_INDEX incX,const void * beta,void * Y,const CBLAS_INDEX incY)12 void cblas_cgemv(const CBLAS_LAYOUT layout,
13 const CBLAS_TRANSPOSE TransA, const CBLAS_INDEX M, const CBLAS_INDEX N,
14 const void *alpha, const void *A, const CBLAS_INDEX lda,
15 const void *X, const CBLAS_INDEX incX, const void *beta,
16 void *Y, const CBLAS_INDEX incY)
17 {
18 char TA;
19 #ifdef F77_CHAR
20 F77_CHAR F77_TA;
21 #else
22 #define F77_TA &TA
23 #endif
24 #ifdef F77_INT
25 F77_INT F77_M=M, F77_N=N, F77_lda=lda, F77_incX=incX, F77_incY=incY;
26 #else
27 #define F77_M M
28 #define F77_N N
29 #define F77_lda lda
30 #define F77_incX incx
31 #define F77_incY incY
32 #endif
33
34 CBLAS_INDEX n=0, i=0, incx=incX;
35 const float *xx= (const float *)X;
36 float ALPHA[2],BETA[2];
37 CBLAS_INDEX tincY, tincx;
38 float *x=(float *)X, *y=(float *)Y, *st=0, *tx=0;
39 const float *stx = x;
40 extern int CBLAS_CallFromC;
41 extern int RowMajorStrg;
42 RowMajorStrg = 0;
43
44 CBLAS_CallFromC = 1;
45
46 if (layout == CblasColMajor)
47 {
48 if (TransA == CblasNoTrans) TA = 'N';
49 else if (TransA == CblasTrans) TA = 'T';
50 else if (TransA == CblasConjTrans) TA = 'C';
51 else
52 {
53 cblas_xerbla(2, "cblas_cgemv","Illegal TransA setting, %d\n", TransA);
54 CBLAS_CallFromC = 0;
55 RowMajorStrg = 0;
56 return;
57 }
58 #ifdef F77_CHAR
59 F77_TA = C2F_CHAR(&TA);
60 #endif
61 F77_cgemv(F77_TA, &F77_M, &F77_N, alpha, A, &F77_lda, X, &F77_incX,
62 beta, Y, &F77_incY);
63 }
64 else if (layout == CblasRowMajor)
65 {
66 RowMajorStrg = 1;
67
68 if (TransA == CblasNoTrans) TA = 'T';
69 else if (TransA == CblasTrans) TA = 'N';
70 else if (TransA == CblasConjTrans)
71 {
72 ALPHA[0]= *( (const float *) alpha );
73 ALPHA[1]= -( *( (const float *) alpha+1) );
74 BETA[0]= *( (const float *) beta );
75 BETA[1]= -( *( (const float *) beta+1 ) );
76 TA = 'N';
77 if (M > 0)
78 {
79 n = M << 1;
80 x = malloc(n*sizeof(float));
81 tx = x;
82 if( incX > 0 ) {
83 i = incX << 1 ;
84 tincx = 2;
85 st= x+n;
86 } else {
87 i = incX *(-2);
88 tincx = -2;
89 st = x-2;
90 x +=(n-2);
91 }
92
93 do
94 {
95 *x = *xx;
96 x[1] = -xx[1];
97 x += tincx ;
98 xx += i;
99 }
100 while (x != st);
101 x=tx;
102
103 F77_incX = 1;
104
105 if(incY > 0)
106 tincY = incY;
107 else
108 tincY = -incY;
109
110 y++;
111
112 if (N > 0)
113 {
114 i = tincY << 1;
115 n = i * N ;
116 st = y + n;
117 do {
118 *y = -(*y);
119 y += i;
120 } while(y != st);
121 y -= n;
122 }
123 stx = x;
124 }
125 else stx = (const float *)X;
126 }
127 else
128 {
129 cblas_xerbla(2, "cblas_cgemv","Illegal TransA setting, %d\n", TransA);
130 CBLAS_CallFromC = 0;
131 RowMajorStrg = 0;
132 return;
133 }
134 #ifdef F77_CHAR
135 F77_TA = C2F_CHAR(&TA);
136 #endif
137 if (TransA == CblasConjTrans)
138 F77_cgemv(F77_TA, &F77_N, &F77_M, ALPHA, A, &F77_lda, stx,
139 &F77_incX, BETA, Y, &F77_incY);
140 else
141 F77_cgemv(F77_TA, &F77_N, &F77_M, alpha, A, &F77_lda, x,
142 &F77_incX, beta, Y, &F77_incY);
143
144 if (TransA == CblasConjTrans)
145 {
146 if (x != (const float *)X) free(x);
147 if (N > 0)
148 {
149 do
150 {
151 *y = -(*y);
152 y += i;
153 }
154 while (y != st);
155 }
156 }
157 }
158 else cblas_xerbla(1, "cblas_cgemv", "Illegal layout setting, %d\n", layout);
159 CBLAS_CallFromC = 0;
160 RowMajorStrg = 0;
161 return;
162 }
163