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Add homebrewed rcVector class and tests, and use it to implement rcIntArray. (#318)

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This implements most of the std::vector interface, with some minor elisions of
infrequently used methods such as "insert", and some STL bookkeeping.
Performance is favorable compared to std::vector, and, in some cases, somewhat
better than naive code to manually manage a malloc'd dynamic array.

BM_FlatArray_Push:                     100 iterations in   72889721 nanos:  728897.21 nanos/it
BM_FlatArray_Fill:                     100 iterations in    2700746 nanos:   27007.46 nanos/it
BM_FlatArray_Memset:                   100 iterations in    2687810 nanos:   26878.10 nanos/it
BM_rcVector_Push:                      100 iterations in   51114316 nanos:  511143.16 nanos/it
BM_rcVector_PushPreallocated:          100 iterations in    9532106 nanos:   95321.06 nanos/it
BM_rcVector_Assign:                    100 iterations in    2371534 nanos:   23715.34 nanos/it
BM_rcVector_AssignIndices:             100 iterations in    2573052 nanos:   25730.52 nanos/it
BM_rcVector_Resize:                    100 iterations in    2455761 nanos:   24557.61 nanos/it
BM_stdvector_Push:                     100 iterations in   71739167 nanos:  717391.67 nanos/it
BM_stdvector_PushPreallocated:         100 iterations in   15723737 nanos:  157237.37 nanos/it
BM_stdvector_Assign:                   100 iterations in    2564985 nanos:   25649.85 nanos/it
BM_stdvector_AssignIndices:            100 iterations in    5174923 nanos:   51749.23 nanos/it
BM_stdvector_Resize:                   100 iterations in    2520054 nanos:   25200.54 nanos/it
This commit is contained in:
mbabinski-at-google
2018-05-13 09:22:56 -05:00
committed by Jakob Botsch Nielsen
parent 18562383f4
commit fa7debb0c3
3 changed files with 637 additions and 77 deletions
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26
Recast/Source/RecastAlloc.cpp
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@@ -58,29 +58,3 @@ void rcFree(void* ptr)
if (ptr)
sRecastFreeFunc(ptr);
}
/// @class rcIntArray
///
/// While it is possible to pre-allocate a specific array size during
/// construction or by using the #resize method, certain methods will
/// automatically resize the array as needed.
///
/// @warning The array memory is not initialized to zero when the size is
/// manually set during construction or when using #resize.
/// @par
///
/// Using this method ensures the array is at least large enough to hold
/// the specified number of elements. This can improve performance by
/// avoiding auto-resizing during use.
void rcIntArray::doResize(int n)
{
if (!m_cap) m_cap = n;
while (m_cap < n) m_cap *= 2;
int* newData = (int*)rcAlloc(m_cap*sizeof(int), RC_ALLOC_TEMP);
rcAssert(newData);
if (m_size && newData) memcpy(newData, m_data, m_size*sizeof(int));
rcFree(m_data);
m_data = newData;
}