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Fix invalid rounding up to power of two in allocators

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#833
This commit is contained in:
Wojtek Figat
2022-11-25 22:07:13 +01:00
parent e6251ea4b0
commit b1618a88be
3 changed files with 8 additions and 8 deletions
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6
Source/Engine/Core/Collections/Dictionary.h
View File

@@ -502,14 +502,14 @@ public:
_deletedCount = _elementsCount = 0;
if (capacity != 0 && (capacity & (capacity - 1)) != 0)
{
// Align capacity value to the next power of two (if it's not)
capacity++;
// Align capacity value to the next power of two (http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2)
capacity--;
capacity |= capacity >> 1;
capacity |= capacity >> 2;
capacity |= capacity >> 4;
capacity |= capacity >> 8;
capacity |= capacity >> 16;
capacity = capacity + 1;
capacity++;
}
if (capacity)
{

6
Source/Engine/Core/Collections/HashSet.h
View File

@@ -373,14 +373,14 @@ public:
_deletedCount = _elementsCount = 0;
if (capacity != 0 && (capacity & (capacity - 1)) != 0)
{
// Align capacity value to the next power of two (if it's not)
capacity++;
// Align capacity value to the next power of two (http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2)
capacity--;
capacity |= capacity >> 1;
capacity |= capacity >> 2;
capacity |= capacity >> 4;
capacity |= capacity >> 8;
capacity |= capacity >> 16;
capacity = capacity + 1;
capacity++;
}
if (capacity)
{

4
Source/Engine/Core/Memory/Allocation.h
View File

@@ -111,8 +111,8 @@ public:
}
else
{
// Round up to the next power of 2 and multiply by 2
capacity++;
// Round up to the next power of 2 and multiply by 2 (http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2)
capacity--;
capacity |= capacity >> 1;
capacity |= capacity >> 2;
capacity |= capacity >> 4;