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/*
* cblas_cgemv.c
* The program is a C interface of cgemv
*
* Keita Teranishi 5/20/98
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "cblas.h"
#include "cblas_f77.h"
void cblas_cgemv(const CBLAS_LAYOUT layout,
const 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)
{
char TA;
#ifdef F77_CHAR
F77_CHAR F77_TA;
#else
#define F77_TA &TA
#endif
#ifdef F77_INT
F77_INT F77_M=M, F77_N=N, F77_lda=lda, F77_incX=incX, F77_incY=incY;
#else
#define F77_M M
#define F77_N N
#define F77_lda lda
#define F77_incX incx
#define F77_incY incY
#endif
int n=0, i=0, incx=incX;
const float *xx= (const float *)X;
float ALPHA[2],BETA[2];
int tincY, tincx;
float *x=(float *)X, *y=(float *)Y, *st=0, *tx=0;
const float *stx = x;
extern int CBLAS_CallFromC;
extern int RowMajorStrg;
RowMajorStrg = 0;
CBLAS_CallFromC = 1;
if (layout == CblasColMajor)
{
if (TransA == CblasNoTrans) TA = 'N';
else if (TransA == CblasTrans) TA = 'T';
else if (TransA == CblasConjTrans) TA = 'C';
else
{
cblas_xerbla(2, "cblas_cgemv","Illegal TransA setting, %d\n", TransA);
CBLAS_CallFromC = 0;
RowMajorStrg = 0;
return;
}
#ifdef F77_CHAR
F77_TA = C2F_CHAR(&TA);
#endif
F77_cgemv(F77_TA, &F77_M, &F77_N, alpha, A, &F77_lda, X, &F77_incX,
beta, Y, &F77_incY);
}
else if (layout == CblasRowMajor)
{
RowMajorStrg = 1;
if (TransA == CblasNoTrans) TA = 'T';
else if (TransA == CblasTrans) TA = 'N';
else if (TransA == CblasConjTrans)
{
ALPHA[0]= *( (const float *) alpha );
ALPHA[1]= -( *( (const float *) alpha+1) );
BETA[0]= *( (const float *) beta );
BETA[1]= -( *( (const float *) beta+1 ) );
TA = 'N';
if (M > 0)
{
n = M << 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;
F77_incX = 1;
if(incY > 0)
tincY = incY;
else
tincY = -incY;
y++;
if (N > 0)
{
i = tincY << 1;
n = i * N ;
st = y + n;
do {
*y = -(*y);
y += i;
} while(y != st);
y -= n;
}
stx = x;
}
else stx = (const float *)X;
}
else
{
cblas_xerbla(2, "cblas_cgemv","Illegal TransA setting, %d\n", TransA);
CBLAS_CallFromC = 0;
RowMajorStrg = 0;
return;
}
#ifdef F77_CHAR
F77_TA = C2F_CHAR(&TA);
#endif
if (TransA == CblasConjTrans)
F77_cgemv(F77_TA, &F77_N, &F77_M, ALPHA, A, &F77_lda, stx,
&F77_incX, BETA, Y, &F77_incY);
else
F77_cgemv(F77_TA, &F77_N, &F77_M, alpha, A, &F77_lda, x,
&F77_incX, beta, Y, &F77_incY);
if (TransA == CblasConjTrans)
{
if (x != (const float *)X) free(x);
if (N > 0)
{
do
{
*y = -(*y);
y += i;
}
while (y != st);
}
}
}
else cblas_xerbla(1, "cblas_cgemv", "Illegal layout setting, %d\n", layout);
CBLAS_CallFromC = 0;
RowMajorStrg = 0;
return;
}
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