LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ cblas_cgemv()

void cblas_cgemv ( CBLAS_LAYOUT  layout,
CBLAS_TRANSPOSE  TransA,
const int  M,
const int  N,
const void *  alpha,
const void *  A,
const int  lda,
const void *  X,
const int  incX,
const void *  beta,
void *  Y,
const int  incY 
)

Definition at line 12 of file cblas_cgemv.c.

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  int n=0, i=0, incx=incX;
35  const float *xx= (const float *)X;
36  float ALPHA[2],BETA[2];
37  int 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 }
int RowMajorStrg
Definition: cblas_globals.c:2
#define F77_M
#define F77_incX
#define F77_TA
#define F77_N
#define F77_cgemv
Definition: cblas_f77.h:142
#define F77_lda
#define F77_incY
int CBLAS_CallFromC
Definition: cblas_globals.c:1
void cblas_xerbla(int p, const char *rout, const char *form,...)
Definition: cblas_xerbla.c:8
#define N
Definition: example_user.c:10
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