From e8ed7b1d1b5bef31e9874f679a5797c2e00d06f1 Mon Sep 17 00:00:00 2001 From: Nilay Vaish Date: Sat, 11 Oct 2014 15:02:23 -0500 Subject: ext: add the source code for DSENT This patch adds a tool called DSENT to the ext/ directory. DSENT is a tool that models power and area for on-chip networks. The next patch adds a script for using the tool. --- ext/dsent/model/TransitionInfo.cc | 70 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 ext/dsent/model/TransitionInfo.cc (limited to 'ext/dsent/model/TransitionInfo.cc') diff --git a/ext/dsent/model/TransitionInfo.cc b/ext/dsent/model/TransitionInfo.cc new file mode 100644 index 000000000..ac4402060 --- /dev/null +++ b/ext/dsent/model/TransitionInfo.cc @@ -0,0 +1,70 @@ +#include "model/TransitionInfo.h" + +namespace DSENT +{ + TransitionInfo::TransitionInfo() + : m_number_transitions_00_(0.25), m_number_transitions_01_(0.25), + m_number_transitions_11_(0.25), m_frequency_multiplier_(1.0) + { + update(); + } + + TransitionInfo::TransitionInfo(double number_transitions_00_, double number_transitions_01_, + double number_transitions_11_) + : m_number_transitions_00_(number_transitions_00_), m_number_transitions_01_(number_transitions_01_), + m_number_transitions_11_(number_transitions_11_) + { + m_frequency_multiplier_ = m_number_transitions_00_ + 2.0 * m_number_transitions_01_ + m_number_transitions_11_; + update(); + } + + TransitionInfo::~TransitionInfo() + {} + + void TransitionInfo::update() + { + ASSERT(m_number_transitions_00_ >= 0.0, "[Error] Number of 0->0 transitions (" + + (String)m_number_transitions_00_ + ") must be >= 0.0!"); + ASSERT(m_number_transitions_01_ >= 0.0, "[Error] Number of 0->1 transitions (" + + (String)m_number_transitions_01_ + ") must be >= 0.0!"); + ASSERT(m_number_transitions_11_ >= 0.0, "[Error] Number of 1->1 transitions (" + (String)m_number_transitions_11_ + ") must be >= 0.0!"); + + m_probability_1_ = (m_number_transitions_01_ + m_number_transitions_11_) / m_frequency_multiplier_; + m_probability_0_ = 1.0 - m_probability_1_; + return; + } + + TransitionInfo TransitionInfo::scaleFrequencyMultiplier(double frequency_multiplier_) const + { + // A short cut if frequency_multiplier_ == m_frequency_multiplier_ to avoid excess calculations + if(frequency_multiplier_ == m_frequency_multiplier_) + { + return TransitionInfo(m_number_transitions_00_, m_number_transitions_01_, m_number_transitions_11_); + } + else if (frequency_multiplier_ > m_frequency_multiplier_) + { + double freq_ratio = frequency_multiplier_ / m_frequency_multiplier_; + double diff_num_trans_01 = m_number_transitions_01_ * (freq_ratio - 1.0); + double norm_num_trans_00 = m_number_transitions_00_ * freq_ratio + diff_num_trans_01; + double norm_num_trans_01 = m_number_transitions_01_; + double norm_num_trans_11 = m_number_transitions_11_ * freq_ratio + diff_num_trans_01; + + return TransitionInfo(norm_num_trans_00, norm_num_trans_01, norm_num_trans_11); + } + else + { + ASSERT(false, "[Error] Cannot scale to frequency multiplier (" + (String) frequency_multiplier_ + + ") since current frequency multiplier (" + (String) m_frequency_multiplier_ + ") is bigger!"); + } + } + + void TransitionInfo::print(std::ostream& ost_) const + { + ost_ << "[" << m_number_transitions_00_ << ", " << m_number_transitions_01_ << ", " << m_number_transitions_11_ << "]"; + ost_ << " [" << m_number_transitions_00_ / m_frequency_multiplier_; + ost_ << ", " << m_number_transitions_01_*2.0 / m_frequency_multiplier_; + ost_ << ", " << m_number_transitions_11_ / m_frequency_multiplier_ << "]" << endl; + return; + } +} // namespace DSENT + -- cgit v1.2.3