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/*
* The MIT License
*
* Wavefront Alignment Algorithms
* Copyright (c) 2017 by Santiago Marco-Sola <santiagomsola@gmail.com>
*
* This file is part of Wavefront Alignment Algorithms.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* PROJECT: Wavefront Alignment Algorithms
* AUTHOR(S): Santiago Marco-Sola <santiagomsola@gmail.com>
* DESCRIPTION: Basic bitmap datastructure (static)
*/
#include "utils/commons.h"
#include "utils/bitmap.h"
#include "system/mm_allocator.h"
/*
* Setup
*/
bitmap_t* bitmap_new(
const uint64_t length,
mm_allocator_t* const mm_allocator) {
// Allocate
bitmap_t* const bitmap =
mm_allocator_alloc(mm_allocator,bitmap_t);
bitmap->mm_allocator = mm_allocator;
// Allocate bitmap-blocks
const uint64_t num_blocks = DIV_CEIL(length,BITMAP_BLOCK_ELEMENTS);
bitmap->num_blocks = num_blocks;
bitmap->bitmap_blocks = mm_allocator_calloc(mm_allocator,num_blocks,bitmap_block_t,true);
// Return
return bitmap;
}
void bitmap_delete(
bitmap_t* const bitmap) {
// Parameters
mm_allocator_t* const mm_allocator = bitmap->mm_allocator;
// Free
mm_allocator_free(mm_allocator,bitmap->bitmap_blocks);
mm_allocator_free(mm_allocator,bitmap);
}
/*
* Accessors
*/
void bitmap_set(
bitmap_t* const bitmap,
const uint64_t position) {
// Locate block
const uint64_t block_num = position / BITMAP_BLOCK_ELEMENTS;
const uint64_t block_pos = position % BITMAP_BLOCK_ELEMENTS;
// Set bitmap
bitmap->bitmap_blocks[block_num].bitmap |= (BITMAP_BLOCK_MASK << block_pos);
}
bool bitmap_is_set(
bitmap_t* const bitmap,
const uint64_t position) {
// Locate block
const uint64_t block_num = position / BITMAP_BLOCK_ELEMENTS;
const uint64_t block_pos = position % BITMAP_BLOCK_ELEMENTS;
// Set bitmap
return bitmap->bitmap_blocks[block_num].bitmap & (BITMAP_BLOCK_MASK << block_pos);
}
bool bitmap_check__set(
bitmap_t* const bitmap,
const uint64_t position) {
// Locate block
const uint64_t block_num = position / BITMAP_BLOCK_ELEMENTS;
const uint64_t block_pos = position % BITMAP_BLOCK_ELEMENTS;
// Check bit set
if (bitmap->bitmap_blocks[block_num].bitmap & (BITMAP_BLOCK_MASK << block_pos)) {
return true; // Return true (it was set)
} else {
// Set bitmap
bitmap->bitmap_blocks[block_num].bitmap |= (BITMAP_BLOCK_MASK << block_pos);
return false; // Return false (it was not set)
}
}
/*
* Rank
*/
void bitmap_update_counters(
bitmap_t* const bitmap) {
// Parameters
const uint64_t num_blocks = bitmap->num_blocks;
bitmap_block_t* bitmap_block = bitmap->bitmap_blocks;
// Update all counters
uint64_t acc_count = 0;
uint64_t i;
for (i=0;i<num_blocks;++i,++bitmap_block) {
bitmap_block->counter = acc_count;
acc_count += POPCOUNT_64(bitmap_block->bitmap);
}
}
uint64_t bitmap_erank(
bitmap_t* const bitmap,
const uint64_t position) {
// Locate block
const uint64_t block_num = position / BITMAP_BLOCK_ELEMENTS;
const uint64_t block_pos = position % BITMAP_BLOCK_ELEMENTS;
// Compute e(xclusive)rank (number of bits set to one before the given position, not included)
bitmap_block_t* const bitmap_block = bitmap->bitmap_blocks + block_num;
const uint64_t bitmap_masked = (block_pos!=0) ? bitmap_block->bitmap << (BITMAP_BLOCK_ELEMENTS - block_pos) : 0;
const uint64_t bitmap_count = POPCOUNT_64(bitmap_masked);
return bitmap_block->counter + bitmap_count;
}
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