/usr/include/fflas-ffpack/ffpack/ffpack_ftrtr.inl is in fflas-ffpack-common 2.2.2-5.
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// vim:sts=8:sw=8:ts=8:noet:sr:cino=>s,f0,{0,g0,(0,\:0,t0,+0,=s
/*
* Copyright (C) 2014 FFLAS-FFACK group
*
* Written by Clement Pernet <Clement.Pernet@imag.fr>
* Brice Boyer (briceboyer) <boyer.brice@gmail.com>
*
*
* ========LICENCE========
* This file is part of the library FFLAS-FFPACK.
*
* FFLAS-FFPACK is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* ========LICENCE========
*.
*/
#ifndef __FFLASFFPACK_ffpack_ftrtr_INL
#define __FFLASFFPACK_ffpack_ftrtr_INL
namespace FFPACK {
template<class Field>
void
ftrtri (const Field& F, const FFLAS::FFLAS_UPLO Uplo, const FFLAS::FFLAS_DIAG Diag,
const size_t N, typename Field::Element_ptr A, const size_t lda)
{
if (N == 1){
if (Diag == FFLAS::FflasNonUnit)
F.invin (*A);
}
else {
size_t N1 = N/2;
size_t N2 = N - N1;
ftrtri (F, Uplo, Diag, N1, A, lda);
ftrtri (F, Uplo, Diag, N2, A + N1*(lda+1), lda);
if (Uplo == FFLAS::FflasUpper){
ftrmm (F, FFLAS::FflasLeft, Uplo, FFLAS::FflasNoTrans, Diag, N1, N2,
F.one, A, lda, A + N1, lda);
ftrmm (F, FFLAS::FflasRight, Uplo, FFLAS::FflasNoTrans, Diag, N1, N2,
F.mOne, A + N1*(lda+1), lda, A + N1, lda);
}
else {
ftrmm (F, FFLAS::FflasLeft, Uplo, FFLAS::FflasNoTrans, Diag, N2, N1,
F.one, A + N1*(lda+1), lda, A + N1*lda, lda);
ftrmm (F, FFLAS::FflasRight, Uplo, FFLAS::FflasNoTrans, Diag, N2, N1,
F.mOne, A, lda, A + N1*lda, lda);
}
}
}
template<class Field>
void
ftrtrm (const Field& F, const FFLAS::FFLAS_DIAG diag, const size_t N,
typename Field::Element_ptr A, const size_t lda)
{
if (N == 1)
return;
size_t N1 = N/2;
size_t N2 = N-N1;
ftrtrm (F, diag, N1, A, lda);
fgemm (F, FFLAS::FflasNoTrans, FFLAS::FflasNoTrans, N1, N1, N2, F.one,
A+N1, lda, A+N1*lda, lda, F.one, A, lda);
ftrmm (F, FFLAS::FflasRight, FFLAS::FflasLower, FFLAS::FflasNoTrans,
(diag == FFLAS::FflasUnit) ? FFLAS::FflasNonUnit : FFLAS::FflasUnit,
N1, N2, F.one, A + N1*(lda+1), lda, A + N1, lda);
ftrmm (F, FFLAS::FflasLeft, FFLAS::FflasUpper, FFLAS::FflasNoTrans, diag, N2, N1,
F.one, A + N1*(lda+1), lda, A + N1*lda, lda);
ftrtrm (F, diag, N2, A + N1*(lda+1), lda);
}
template<class Field>
void trinv_left( const Field& F, const size_t N, typename Field::ConstElement_ptr L, const size_t ldl,
typename Field::Element_ptr X, const size_t ldx )
{
FFLAS::fassign(F,N,N,L,ldl,X,ldx);
ftrtri (F, FFLAS::FflasLower, FFLAS::FflasUnit, N, X, ldx);
//invL(F,N,L,ldl,X,ldx);
}
} // FFPACK
#endif // __FFLASFFPACK_ffpack_ftrtr_INL
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