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/*
* cblas_chbmv.c
* The program is a C interface to chbmv
*
* Keita Teranishi 5/18/98
*
*/
#include "cblas.h"
#include "cblas_f77.h"
#include <stdio.h>
#include <stdlib.h>
void cblas_chbmv(const enum CBLAS_ORDER order,
const enum CBLAS_UPLO Uplo,const CBLAS_INT_TYPE N,const CBLAS_INT_TYPE K,
const void *alpha, const void *A, const CBLAS_INT_TYPE lda,
const void *X, const CBLAS_INT_TYPE incX, const void *beta,
void *Y, const CBLAS_INT_TYPE 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_K=K, F77_lda=lda, F77_incX=incX, F77_incY=incY;
#else
#define F77_N N
#define F77_K K
#define F77_lda lda
#define F77_incX incx
#define F77_incY incY
#endif
CBLAS_INT_TYPE n, i=0, incx=incX;
const float *xx= (float *)X, *alp= (float *)alpha, *bet = (float *)beta;
float ALPHA[2],BETA[2];
CBLAS_INT_TYPE tincY, tincx;
float *x=(float *)X, *y=(float *)Y, *st=0, *tx;
if (order == CblasColMajor)
{
if (Uplo == CblasLower) UL = 'L';
else if (Uplo == CblasUpper) UL = 'U';
else
{
cblas_xerbla(2, "cblas_chbmv","Illegal Uplo setting, %d\n",Uplo );
return;
}
#ifdef F77_CHAR
F77_UL = C2F_CHAR(&UL);
#endif
F77_chbmv(F77_UL, &F77_N, &F77_K, alpha, A, &F77_lda, X,
&F77_incX, beta, Y, &F77_incY);
}
else if (order == CblasRowMajor)
{
ALPHA[0]= *alp;
ALPHA[1]= -alp[1];
BETA[0]= *bet;
BETA[1]= -bet[1];
if (N > 0)
{
n = N << 1;
x = malloc(n*sizeof(float));
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 = (float *) X;
if (Uplo == CblasUpper) UL = 'L';
else if (Uplo == CblasLower) UL = 'U';
else
{
cblas_xerbla(2, "cblas_chbmv","Illegal Uplo setting, %d\n", Uplo);
return;
}
#ifdef F77_CHAR
F77_UL = C2F_CHAR(&UL);
#endif
F77_chbmv(F77_UL, &F77_N, &F77_K, ALPHA,
A ,&F77_lda, x,&F77_incX, BETA, Y, &F77_incY);
}
else
{
cblas_xerbla(1, "cblas_chbmv","Illegal Order setting, %d\n", order);
return;
}
if ( order == CblasRowMajor )
{
if(X!=x)
free(x);
if (N > 0)
{
do
{
*y = -(*y);
y += i;
}
while (y != st);
}
}
return;
}
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