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add reallocate() function and use it in bit_vector and vector containers

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give a speedup of 1-4%

Signed-off-by: Nuno Lopes <a-nlopes@microsoft.com>
This commit is contained in:
Nuno Lopes 2015-03-10 16:53:47 +00:00
parent 55ca6ce44b
commit 44e647e72b
5 changed files with 51 additions and 18 deletions
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12
src/util/vector.h
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@ -71,18 +71,12 @@ class vector {
SZ old_capacity_T = sizeof(T) * old_capacity + sizeof(SZ) * 2;
SZ new_capacity = (3 * old_capacity + 1) >> 1;
SZ new_capacity_T = sizeof(T) * new_capacity + sizeof(SZ) * 2;
SZ size = reinterpret_cast<SZ *>(m_data)[SIZE_IDX];
if (new_capacity <= old_capacity || new_capacity_T <= old_capacity_T) {
throw default_exception("Overflow encountered when expanding vector");
}
SZ * mem = reinterpret_cast<SZ*>(memory::allocate(new_capacity_T));
*mem = new_capacity;
mem ++;
*mem = size;
mem++;
memcpy(mem, m_data, size * sizeof(T));
free_memory();
m_data = reinterpret_cast<T *>(mem);
SZ *mem = (SZ*)memory::reallocate(reinterpret_cast<SZ*>(m_data)-2, new_capacity_T);
*mem = new_capacity;
m_data = reinterpret_cast<T *>(mem + 2);
}
}