LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ cblas_chemv()

void cblas_chemv ( CBLAS_LAYOUT  layout,
CBLAS_UPLO  Uplo,
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_chemv.c.

17 {
18  char UL;
19 #ifdef F77_CHAR
20  F77_CHAR F77_UL;
21 #else
22  #define F77_UL &UL
23 #endif
24 #ifdef F77_INT
25  F77_INT F77_N=N, F77_lda=lda, F77_incX=incX, F77_incY=incY;
26 #else
27  #define F77_N N
28  #define F77_lda lda
29  #define F77_incX incx
30  #define F77_incY incY
31 #endif
32  int n=0, i=0, incx=incX;
33  const float *xx= (float *)X, *alp= (float *)alpha, *bet = (float *)beta;
34  float ALPHA[2],BETA[2];
35  int tincY, tincx;
36  float *x=(float *)X, *y=(float *)Y, *st=0, *tx;
37  extern int CBLAS_CallFromC;
38  extern int RowMajorStrg;
39  RowMajorStrg = 0;
40 
41 
42  CBLAS_CallFromC = 1;
43  if (layout == CblasColMajor)
44  {
45  if (Uplo == CblasUpper) UL = 'U';
46  else if (Uplo == CblasLower) UL = 'L';
47  else
48  {
49  cblas_xerbla(2, "cblas_chemv","Illegal Uplo setting, %d\n",Uplo );
50  CBLAS_CallFromC = 0;
51  RowMajorStrg = 0;
52  return;
53  }
54  #ifdef F77_CHAR
55  F77_UL = C2F_CHAR(&UL);
56  #endif
57  F77_chemv(F77_UL, &F77_N, alpha, A, &F77_lda, X, &F77_incX,
58  beta, Y, &F77_incY);
59  }
60  else if (layout == CblasRowMajor)
61  {
62  RowMajorStrg = 1;
63  ALPHA[0]= *alp;
64  ALPHA[1]= -alp[1];
65  BETA[0]= *bet;
66  BETA[1]= -bet[1];
67 
68  if (N > 0)
69  {
70  n = N << 1;
71  x = malloc(n*sizeof(float));
72 
73  tx = x;
74  if( incX > 0 ) {
75  i = incX << 1 ;
76  tincx = 2;
77  st= x+n;
78  } else {
79  i = incX *(-2);
80  tincx = -2;
81  st = x-2;
82  x +=(n-2);
83  }
84 
85  do
86  {
87  *x = *xx;
88  x[1] = -xx[1];
89  x += tincx ;
90  xx += i;
91  }
92  while (x != st);
93  x=tx;
94 
95 
96  #ifdef F77_INT
97  F77_incX = 1;
98  #else
99  incx = 1;
100  #endif
101 
102  if(incY > 0)
103  tincY = incY;
104  else
105  tincY = -incY;
106  y++;
107 
108  i = tincY << 1;
109  n = i * N ;
110  st = y + n;
111  do {
112  *y = -(*y);
113  y += i;
114  } while(y != st);
115  y -= n;
116  } else
117  x = (float *) X;
118 
119 
120  if (Uplo == CblasUpper) UL = 'L';
121  else if (Uplo == CblasLower) UL = 'U';
122  else
123  {
124  cblas_xerbla(2, "cblas_chemv","Illegal Uplo setting, %d\n", Uplo);
125  CBLAS_CallFromC = 0;
126  RowMajorStrg = 0;
127  return;
128  }
129  #ifdef F77_CHAR
130  F77_UL = C2F_CHAR(&UL);
131  #endif
132  F77_chemv(F77_UL, &F77_N, ALPHA, A, &F77_lda, x, &F77_incX,
133  BETA, Y, &F77_incY);
134  }
135  else
136  {
137  cblas_xerbla(1, "cblas_chemv","Illegal layout setting, %d\n", layout);
138  CBLAS_CallFromC = 0;
139  RowMajorStrg = 0;
140  return;
141  }
142  if ( layout == CblasRowMajor )
143  {
144  RowMajorStrg = 1;
145  if ( X != x )
146  free(x);
147  if (N > 0)
148  {
149  do
150  {
151  *y = -(*y);
152  y += i;
153  }
154  while (y != st);
155  }
156  }
157  CBLAS_CallFromC = 0;
158  RowMajorStrg = 0;
159  return;
160 }
int RowMajorStrg
Definition: cblas_globals.c:2
#define F77_chemv
Definition: cblas_f77.h:108
#define F77_incX
#define F77_N
#define F77_UL
#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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