/usr/include/linbox/fflas/fflas_fger.inl is in liblinbox-dev 1.1.6~rc0-4.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/* fflas/fflas_fger.inl
* Copyright (C) 2005 Clement Pernet
*
* Written by Clement Pernet <Clement.Pernet@imag.fr>
*
* See COPYING for license information.
*/
template<class Field>
inline void
FFLAS::fger (const Field& F, const size_t M, const size_t N,
const typename Field::Element alpha,
const typename Field::Element * x, const size_t incx,
const typename Field::Element * y, const size_t incy,
typename Field::Element * A, const size_t lda){
static typename Field::Element one, mone, tmp;
F.init( one, 1UL );
F.neg (mone, one);
const typename Field::Element* xi=x, *yj=y;
typename Field::Element* Ai=A;
if ( M < N ){
if ( F.areEqual( alpha, one ) )
for ( ; Ai < A+M*lda; Ai+=lda, xi+=incx ){
yj = y;
for (size_t j = 0; j < N; ++j, yj+=incy )
F.axpyin( *(Ai+j), *xi, *yj );
}
else if ( F.areEqual( alpha, mone ) )
for ( ; Ai < A+M*lda; Ai+=lda, xi+=incx ){
F.neg( tmp, *xi );
yj = y;
for (size_t j = 0; j < N; ++j, yj+=incy )
F.axpyin( *(Ai+j), tmp, *yj );
}
else
for ( ; Ai < A+M*lda; Ai+=lda, xi+=incx ){
F.mul( tmp, alpha, *xi );
yj = y;
for (size_t j = 0; j < N; ++j, yj+=incy )
F.axpyin( *(Ai+j), tmp, *yj );
}
} else {
if ( F.areEqual( alpha, one ) ){
for ( ; Ai < A+N; ++Ai, yj+=incy ){
xi = x;
for (size_t i = 0; i < M; ++i, xi+=incx )
F.axpyin( *(Ai+i*lda), *xi, *yj );
}
}
else if ( F.areEqual( alpha, mone ) )
for ( ; Ai < A+N; ++Ai, yj+=incy ){
F.neg( tmp, *yj );
xi = x;
for (size_t i = 0; i < M; ++i, xi+=incx )
F.axpyin( *(Ai+i*lda), *xi, tmp );
}
else
for ( ; Ai < A+N; ++Ai, yj+=incy ){
F.mul( tmp, alpha, *yj );
xi = x;
for (size_t i = 0; i < M; ++i, xi+=incx )
F.axpyin( *(Ai+i*lda), *xi, tmp );
}
}
}
template<>
inline void
FFLAS::fger( const DoubleDomain& D, const size_t M, const size_t N,
const DoubleDomain::Element alpha,
const DoubleDomain::Element * x, const size_t incx,
const DoubleDomain::Element * y, const size_t incy,
DoubleDomain::Element * A, const size_t lda){
cblas_dger( CblasRowMajor, M, N, alpha, x, incx, y, incy, A, lda );
}
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