Module: ppl/ppl Branch: MPI Commit: 620592736a503f2ee3d40880a6ca4ee25a6a7bd9 URL: http://www.cs.unipr.it/git/gitweb.cgi?p=ppl/ppl.git;a=commit;h=620592736a503...
Author: Marco Poletti poletti.marco@gmail.com Date: Sun Sep 12 10:56:32 2010 +0200
MIP_Problem: improve a little bit the get_exiting_base_index() performance.
---
src/MIP_Problem.cc | 13 ++++++------- 1 files changed, 6 insertions(+), 7 deletions(-)
diff --git a/src/MIP_Problem.cc b/src/MIP_Problem.cc index 882af9e..6d1981a 100644 --- a/src/MIP_Problem.cc +++ b/src/MIP_Problem.cc @@ -1467,9 +1467,8 @@ PPL::MIP_Problem PPL_DIRTY_TEMP_COEFFICIENT(challenger); // These pointers are used instead of references in the following loop, to // improve performance. - const matrix_type::row_type* t_e = &(tableau[exiting_base_index]); - Coefficient t_e0 = t_e->get(0); - Coefficient t_ee = t_e->get(entering_var_index); + Coefficient t_e0 = tableau[exiting_base_index].get(0); + Coefficient t_ee = tableau[exiting_base_index].get(entering_var_index); for (dimension_type i = exiting_base_index + 1; i < tableau_num_rows; ++i) { const matrix_type::row_type& t_i = tableau[i]; Coefficient_traits::const_reference t_ie = t_i.get(entering_var_index); @@ -1477,21 +1476,21 @@ PPL::MIP_Problem const int t_ie_sign = sgn(t_ie); if (t_ie_sign != 0 && t_ie_sign == sgn(t_ib)) { WEIGHT_BEGIN(); + Coefficient_traits::const_reference t_i0 = t_i.get(0); lcm_assign(lcm, t_ee, t_ie); exact_div_assign(current_min, lcm, t_ee); current_min *= t_e0; abs_assign(current_min); exact_div_assign(challenger, lcm, t_ie); - challenger *= t_i.get(0); + challenger *= t_i0; abs_assign(challenger); current_min -= challenger; const int sign = sgn(current_min); if (sign > 0 || (sign == 0 && base[i] < base[exiting_base_index])) { exiting_base_index = i; - t_e = &(tableau[exiting_base_index]); - t_e0 = t_e->get(0); - t_ee = t_e->get(entering_var_index); + t_e0 = t_i0; + t_ee = t_ie; } WEIGHT_ADD(1044); }