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/*
* cblas_zhemv.c
* The program is a C interface to zhemv
*
* Keita Teranishi 5/18/98
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "cblas.h"
#include "cblas_f77.h"
void cblas_zhemv(const CBLAS_LAYOUT layout,
const 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)
{
char UL;
#ifdef F77_CHAR
F77_CHAR F77_UL;
#else
#define F77_UL &UL
#endif
#ifdef F77_INT
F77_INT F77_N=N, F77_lda=lda, F77_incX=incX, F77_incY=incY;
#else
#define F77_N N
#define F77_lda lda
#define F77_incX incx
#define F77_incY incY
#endif
int n, i=0, incx=incX;
const double *xx= (double *)X, *alp= (double *)alpha, *bet = (double *)beta;
double ALPHA[2],BETA[2];
int tincY, tincx;
double *x=(double *)X, *y=(double *)Y, *st=0, *tx;
extern int CBLAS_CallFromC;
extern int RowMajorStrg;
RowMajorStrg = 0;
CBLAS_CallFromC = 1;
if (layout == CblasColMajor)
{
if (Uplo == CblasUpper) UL = 'U';
else if (Uplo == CblasLower) UL = 'L';
else
{
cblas_xerbla(2, "cblas_zhemv","Illegal Uplo setting, %d\n",Uplo );
CBLAS_CallFromC = 0;
RowMajorStrg = 0;
return;
}
#ifdef F77_CHAR
F77_UL = C2F_CHAR(&UL);
#endif
F77_zhemv(F77_UL, &F77_N, alpha, A, &F77_lda, X, &F77_incX,
beta, Y, &F77_incY);
}
else if (layout == CblasRowMajor)
{
RowMajorStrg = 1;
ALPHA[0]= *alp;
ALPHA[1]= -alp[1];
BETA[0]= *bet;
BETA[1]= -bet[1];
if (N > 0)
{
n = N << 1;
x = malloc(n*sizeof(double));
tx = x;
if( incX > 0 ) {
i = incX << 1 ;
tincx = 2;
st= x+n;
} else {
i = incX *(-2);
tincx = -2;
st = x-2;
x +=(n-2);
}
do
{
*x = *xx;
x[1] = -xx[1];
x += tincx ;
xx += i;
}
while (x != st);
x=tx;
#ifdef F77_INT
F77_incX = 1;
#else
incx = 1;
#endif
if(incY > 0)
tincY = incY;
else
tincY = -incY;
y++;
i = tincY << 1;
n = i * N ;
st = y + n;
do {
*y = -(*y);
y += i;
} while(y != st);
y -= n;
} else
x = (double *) X;
if (Uplo == CblasUpper) UL = 'L';
else if (Uplo == CblasLower) UL = 'U';
else
{
cblas_xerbla(2, "cblas_zhemv","Illegal Uplo setting, %d\n", Uplo);
CBLAS_CallFromC = 0;
RowMajorStrg = 0;
return;
}
#ifdef F77_CHAR
F77_UL = C2F_CHAR(&UL);
#endif
F77_zhemv(F77_UL, &F77_N, ALPHA, A, &F77_lda, x, &F77_incX,
BETA, Y, &F77_incY);
}
else
{
cblas_xerbla(1, "cblas_zhemv","Illegal layout setting, %d\n", layout);
CBLAS_CallFromC = 0;
RowMajorStrg = 0;
return;
}
if ( layout == CblasRowMajor )
{
RowMajorStrg = 1;
if ( X != x )
free(x);
if (N > 0)
{
do
{
*y = -(*y);
y += i;
}
while (y != st);
}
}
CBLAS_CallFromC = 0;
RowMajorStrg = 0;
return;
}
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