| /***************************************************************************** |
| |
| Licensed to Accellera Systems Initiative Inc. (Accellera) under one or |
| more contributor license agreements. See the NOTICE file distributed |
| with this work for additional information regarding copyright ownership. |
| Accellera licenses this file to you under the Apache License, Version 2.0 |
| (the "License"); you may not use this file except in compliance with the |
| License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
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| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
| implied. See the License for the specific language governing |
| permissions and limitations under the License. |
| |
| *****************************************************************************/ |
| |
| /***************************************************************************** |
| |
| scfx_mant.cpp - |
| |
| Original Author: Robert Graulich, Synopsys, Inc. |
| Martin Janssen, Synopsys, Inc. |
| |
| *****************************************************************************/ |
| |
| /***************************************************************************** |
| |
| MODIFICATION LOG - modifiers, enter your name, affiliation, date and |
| changes you are making here. |
| |
| Name, Affiliation, Date: |
| Description of Modification: |
| |
| *****************************************************************************/ |
| |
| |
| // $Log: scfx_mant.cpp,v $ |
| // Revision 1.1.1.1 2006/12/15 20:20:04 acg |
| // SystemC 2.3 |
| // |
| // Revision 1.3 2006/01/13 18:53:58 acg |
| // Andy Goodrich: added $Log command so that CVS comments are reproduced in |
| // the source. |
| // |
| |
| #include "sysc/datatypes/fx/scfx_mant.h" |
| |
| |
| namespace sc_dt |
| { |
| |
| // ---------------------------------------------------------------------------- |
| // word memory management |
| // ---------------------------------------------------------------------------- |
| |
| class word_list { // Entry in free_words bucket. |
| public: |
| word_list* m_next_p; |
| }; |
| |
| static inline |
| int |
| next_pow2_index( std::size_t size ) |
| { |
| int index = scfx_find_msb( size ); |
| // If this was a power of 2 we are one bucket too low. |
| if( ~ (1 << index) & size ) index ++; |
| // If this is a 64-bit machine and we are using 32-bit words go down |
| // one slot size, as all the slots are 2x in size. |
| if ( index != 0 && ( sizeof(word_list) != sizeof(word) ) ) |
| { |
| index -= 1; |
| } |
| return index; |
| } |
| |
| static word_list* free_words[32] = { 0 }; |
| |
| word* |
| scfx_mant::alloc_word( std::size_t size ) |
| { |
| const int ALLOC_SIZE = 128; |
| |
| int slot_index = next_pow2_index( size ); |
| |
| int alloc_size = ( 1 << slot_index ); |
| |
| word_list*& slot = free_words[slot_index]; |
| |
| if( ! slot ) |
| { |
| slot = new word_list[ALLOC_SIZE * alloc_size]; |
| int i; |
| for( i = 0; i < alloc_size*(ALLOC_SIZE-1) ; i+=alloc_size ) |
| { |
| slot[i].m_next_p = &slot[i+alloc_size]; |
| } |
| slot[i].m_next_p = 0; |
| } |
| |
| word* result = (word*)slot; |
| free_words[slot_index] = slot[0].m_next_p; |
| return result; |
| } |
| |
| void |
| scfx_mant::free_word( word* array, std::size_t size ) |
| { |
| if( array && size ) |
| { |
| int slot_index = next_pow2_index( size ); |
| word_list* wl_p = (word_list*)array; |
| |
| wl_p->m_next_p = free_words[slot_index]; |
| free_words[slot_index] = wl_p; |
| } |
| } |
| |
| } // namespace sc_dt |
| |
| |
| // Taf! |