mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 11:43:47 +01:00
b534936589
- The previous version of the * operator for matrix was too clever. It was giving a lazy object and then rewriting C = A *B into gemm (a,A,B,0,C). The pb was in case of aliasing : when e.g. C = A, or is a part of A. gemm is not correct that case, and as a result generic code like a = a *b may not be correct in matrix case, which is unacceptable. - So we revert to a simple * operator for matrix that does immediate computation. Same thing for matrix* vector - we also suppress a_x_ty class. -> for M = a * b, when M is a matrix, there is no overhead due to move assignment -> however, when M is a view, there is an additionnal copy. -Correctness comes first, hence the fix. However, if one wants more speed and one can guarantee that there is no aliasing possible, then one has to write a direct gemm call. -> det_manip class was adapted, since in that case, we can show there no alias, and we want the speed gain, so the * ops where replaced by direct blas call (using the array blas interface). -> also gemm, gemv, ger were overloaded in the case the return matrix/vector (i.e. last parameter of the function) is not an lvalue, but a temporary view created on the fly.
96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
/*******************************************************************************
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*
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* TRIQS: a Toolbox for Research in Interacting Quantum Systems
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*
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* Copyright (C) 2011 by O. Parcollet
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*
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* TRIQS is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* TRIQS. If not, see <http://www.gnu.org/licenses/>.
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*
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******************************************************************************/
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#include "./common.hpp"
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#include "./src/array.hpp"
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#include "./src/vector.hpp"
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#include "./src/matrix.hpp"
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#include "./src/linalg/det_and_inverse.hpp"
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#include "./src/blas_lapack/gemm.hpp"
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#include "./src/blas_lapack/gemv.hpp"
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#include "./src/blas_lapack/ger.hpp"
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#include "./src/blas_lapack/axpy.hpp"
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#include <iostream>
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using namespace triqs::arrays;
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int main(int argc, char **argv) {
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typedef std::complex<double> T;
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triqs::arrays::vector<T> V(5),V2(5);
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for (int i =0; i<5; ++i) {V(i) = i; V2(i) = -1;}
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std::cout<<"V = "<<V<<std::endl;
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std::cout<<"V2 = "<<V2<<std::endl;
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std::cout <<"starting blas test"<<std::endl;
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blas::axpy(2.0,V,V2);
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std::cout<<"V = "<<V<<std::endl;
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std::cout<<"V2 = "<<V2<<std::endl;
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triqs::arrays::vector <double> V3(2);
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for (int i =0; i<2; ++i) {V3(i) = i+1;}
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triqs::arrays::matrix<double> M1(2,2,FORTRAN_LAYOUT), M2(2,2,FORTRAN_LAYOUT), M3(2,2,FORTRAN_LAYOUT);
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for (int i =0; i<2; ++i)
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for (int j=0; j<2; ++j)
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{ M1(i,j) = i+j; M2(i,j) = 1; M3(i,j)=0;}
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// try to multiply
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blas::gemm(1.0,M1, M2, 1.0, M3);
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std::cout<<"M1 = "<<M1<<std::endl;
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std::cout<<"M2 = "<<M2<<std::endl;
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std::cout<<"M3 = "<<M3<<std::endl;
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triqs::arrays::matrix<double> Mc1(2,2), Mc2(2,2), Mc3(2,2);
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for (int i =0; i<2; ++i)
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for (int j=0; j<2; ++j)
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{ Mc1(i,j) = i+j; Mc2(i,j) = 1; Mc3(i,j)=0;}
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// try to multiply
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blas::gemm(1.0,Mc1, Mc2, 1.0, Mc3);
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std::cout<<"Mc1 = "<<Mc1<<std::endl;
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std::cout<<"Mc2 = "<<Mc2<<std::endl;
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std::cout<<"Mc3 = "<<Mc3<<std::endl;
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std::cout<<"V3 = "<<V3<<std::endl;
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blas::ger(1.0,V3,V3,M2);
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std::cout<<"M2 = "<<M2<<std::endl;
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// try to invert
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triqs::arrays::vector <int> ipiv(2);
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lapack::getrf(M1, ipiv);
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lapack::getri(M1, ipiv);
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std::cout<<"inv M1 = "<<M1<<std::endl;
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}
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