346   FunctionSample solution, bracket_low, bracket_high;  in Search()  local
362                              &bracket_low,  in Search()
383     summary->optimal_step_size = bracket_low.x;  in Search()
390           << bracket_low << ", bracket_high: " << bracket_high  in Search()
391           << ", bracket width: " << fabs(bracket_low.x - bracket_high.x)  in Search()
393           << fabs(bracket_low.value - bracket_high.value);  in Search()
416                        bracket_low,  in Search()
430       solution.value_is_valid && solution.value <= bracket_low.value  in Search()
431       ? solution : bracket_low;  in Search()
456     FunctionSample* bracket_low,  in BracketingPhase()  argument
470   *bracket_low = initial_position;  in BracketingPhase()
502       *bracket_low = previous;  in BracketingPhase()
517       *bracket_low = current;  in BracketingPhase()
534       *bracket_low = current;  in BracketingPhase()
559       *bracket_low = current;  in BracketingPhase()
575       *bracket_low =  in BracketingPhase()
576           current.value_is_valid && current.value < bracket_low->value  in BracketingPhase()
577           ? current : *bracket_low;  in BracketingPhase()
629       fabs(bracket_high->x - bracket_low->x) * descent_direction_max_norm  in BracketingPhase()
642                                 FunctionSample bracket_low,  in ZoomPhase()  argument
648   CHECK(bracket_low.value_is_valid && bracket_low.gradient_is_valid)  in ZoomPhase()
652       << ", bracket_low: " << bracket_low  in ZoomPhase()
670       << ", bracket_low: " << bracket_low  in ZoomPhase()
673   if (bracket_low.gradient * (bracket_high.x - bracket_low.x) >= 0) {  in ZoomPhase()
690                      bracket_low.gradient * (bracket_high.x - bracket_low.x),  in ZoomPhase()
692                      bracket_low.ToDebugString().c_str(),  in ZoomPhase()
707     *solution = bracket_low;  in ZoomPhase()
718     if (fabs(bracket_high.x - bracket_low.x) * descent_direction_max_norm  in ZoomPhase()
725                        fabs(bracket_high.x - bracket_low.x),  in ZoomPhase()
735         bracket_low.x < bracket_high.x ? bracket_low : bracket_high;  in ZoomPhase()
737         bracket_low.x < bracket_high.x ? bracket_high : bracket_low;  in ZoomPhase()
777                        solution->x, bracket_low.x, bracket_high.x);  in ZoomPhase()
784             << ", bracket_low: " << bracket_low  in ZoomPhase()
792         (solution->value >= bracket_low.value)) {  in ZoomPhase()
809     } else if (solution->gradient * (bracket_high.x - bracket_low.x) >= 0) {  in ZoomPhase()
810       bracket_high = bracket_low;  in ZoomPhase()
813     bracket_low = *solution;  in ZoomPhase()