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author | Nathan Binkert <nate@binkert.org> | 2010-03-22 18:43:53 -0700 |
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committer | Nathan Binkert <nate@binkert.org> | 2010-03-22 18:43:53 -0700 |
commit | 5ab13e2deb8f904ef2a233749193fa09ea7013c4 (patch) | |
tree | 07f5f02902f9e719fe58d1a9419b5a1d51f7a2ce /src/mem/ruby/system/PseudoLRUPolicy.hh | |
parent | 2620e08722b38660658d46cdb76c337db18e877c (diff) | |
download | gem5-5ab13e2deb8f904ef2a233749193fa09ea7013c4.tar.xz |
ruby: style pass
Diffstat (limited to 'src/mem/ruby/system/PseudoLRUPolicy.hh')
-rw-r--r-- | src/mem/ruby/system/PseudoLRUPolicy.hh | 157 |
1 files changed, 80 insertions, 77 deletions
diff --git a/src/mem/ruby/system/PseudoLRUPolicy.hh b/src/mem/ruby/system/PseudoLRUPolicy.hh index 61bf72c3e..1e1e68188 100644 --- a/src/mem/ruby/system/PseudoLRUPolicy.hh +++ b/src/mem/ruby/system/PseudoLRUPolicy.hh @@ -26,8 +26,8 @@ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ -#ifndef PSEUDOLRUPOLICY_H -#define PSEUDOLRUPOLICY_H +#ifndef __MEM_RUBY_SYSTEM_PSEUDOLRUPOLICY_HH__ +#define __MEM_RUBY_SYSTEM_PSEUDOLRUPOLICY_HH__ #include "mem/ruby/system/AbstractReplacementPolicy.hh" @@ -44,94 +44,97 @@ * 2 is one below the associativy, and most fair when it is one above. */ -class PseudoLRUPolicy : public AbstractReplacementPolicy { - public: - - PseudoLRUPolicy(Index num_sets, Index assoc); - ~PseudoLRUPolicy(); - - void touch(Index set, Index way, Time time); - Index getVictim(Index set) const; - - private: - unsigned int m_effective_assoc; /** nearest (to ceiling) power of 2 */ - unsigned int m_num_levels; /** number of levels in the tree */ - uint64* m_trees; /** bit representation of the trees, one for each set */ +class PseudoLRUPolicy : public AbstractReplacementPolicy +{ + public: + PseudoLRUPolicy(Index num_sets, Index assoc); + ~PseudoLRUPolicy(); + + void touch(Index set, Index way, Time time); + Index getVictim(Index set) const; + + private: + unsigned int m_effective_assoc; /** nearest (to ceiling) power of 2 */ + unsigned int m_num_levels; /** number of levels in the tree */ + uint64* m_trees; /** bit representation of the + * trees, one for each set */ }; inline PseudoLRUPolicy::PseudoLRUPolicy(Index num_sets, Index assoc) - : AbstractReplacementPolicy(num_sets, assoc) + : AbstractReplacementPolicy(num_sets, assoc) { - int num_tree_nodes; - - // associativity cannot exceed capacity of tree representation - assert(num_sets > 0 && assoc > 1 && assoc <= (Index) sizeof(uint64)*4); - - m_trees = NULL; - m_num_levels = 0; - - m_effective_assoc = 1; - while(m_effective_assoc < assoc){ - m_effective_assoc <<= 1; // effective associativity is ceiling power of 2 - } - assoc = m_effective_assoc; - while(true){ - assoc /= 2; - if(!assoc) break; - m_num_levels++; - } - assert(m_num_levels < sizeof(unsigned int)*4); - num_tree_nodes = (1 << m_num_levels) - 1; - m_trees = new uint64[m_num_sets]; - for(unsigned int i=0; i< m_num_sets; i++){ - m_trees[i] = 0; - } + int num_tree_nodes; + + // associativity cannot exceed capacity of tree representation + assert(num_sets > 0 && assoc > 1 && assoc <= (Index) sizeof(uint64)*4); + + m_trees = NULL; + m_num_levels = 0; + + m_effective_assoc = 1; + while (m_effective_assoc < assoc) { + // effective associativity is ceiling power of 2 + m_effective_assoc <<= 1; + } + assoc = m_effective_assoc; + while (true) { + assoc /= 2; + if(!assoc) break; + m_num_levels++; + } + assert(m_num_levels < sizeof(unsigned int)*4); + num_tree_nodes = (1 << m_num_levels) - 1; + m_trees = new uint64[m_num_sets]; + for (unsigned i = 0; i < m_num_sets; i++) { + m_trees[i] = 0; + } } inline PseudoLRUPolicy::~PseudoLRUPolicy() { - if(m_trees != NULL) - delete[] m_trees; + if (m_trees != NULL) + delete[] m_trees; } -inline -void PseudoLRUPolicy::touch(Index set, Index index, Time time){ - assert(index >= 0 && index < m_assoc); - assert(set >= 0 && set < m_num_sets); - - int tree_index = 0; - int node_val; - for(int i=m_num_levels -1; i>=0; i--){ - node_val = (index >> i)&1; - if(node_val) - m_trees[set] |= node_val << tree_index; - else - m_trees[set] &= ~(1 << tree_index); - tree_index = node_val ? (tree_index*2)+2 : (tree_index*2)+1; - } - m_last_ref_ptr[set][index] = time; +inline void +PseudoLRUPolicy::touch(Index set, Index index, Time time) +{ + assert(index >= 0 && index < m_assoc); + assert(set >= 0 && set < m_num_sets); + + int tree_index = 0; + int node_val; + for (int i = m_num_levels - 1; i >= 0; i--) { + node_val = (index >> i)&1; + if (node_val) + m_trees[set] |= node_val << tree_index; + else + m_trees[set] &= ~(1 << tree_index); + tree_index = node_val ? (tree_index*2)+2 : (tree_index*2)+1; + } + m_last_ref_ptr[set][index] = time; } -inline -Index PseudoLRUPolicy::getVictim(Index set) const { - // assert(m_assoc != 0); - - Index index = 0; - - int tree_index = 0; - int node_val; - for(unsigned int i=0;i<m_num_levels;i++){ - node_val = (m_trees[set]>>tree_index)&1; - index += node_val?0:(m_effective_assoc >> (i+1)); - tree_index = node_val? (tree_index*2)+1 : (tree_index*2)+2; - } - assert(index >= 0 && index < m_effective_assoc); - - /* return either the found index or the max possible index */ - /* NOTE: this is not a fair replacement when assoc is not a power of 2 */ - return (index > (m_assoc-1)) ? m_assoc-1:index; +inline Index +PseudoLRUPolicy::getVictim(Index set) const +{ + // assert(m_assoc != 0); + Index index = 0; + + int tree_index = 0; + int node_val; + for (unsigned i = 0; i < m_num_levels; i++){ + node_val = (m_trees[set] >> tree_index) & 1; + index += node_val ? 0 : (m_effective_assoc >> (i + 1)); + tree_index = node_val ? (tree_index * 2) + 1 : (tree_index * 2) + 2; + } + assert(index >= 0 && index < m_effective_assoc); + + /* return either the found index or the max possible index */ + /* NOTE: this is not a fair replacement when assoc is not a power of 2 */ + return (index > (m_assoc - 1)) ? m_assoc - 1 : index; } -#endif // PSEUDOLRUPOLICY_H +#endif // __MEM_RUBY_SYSTEM_PSEUDOLRUPOLICY_HH__ |