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Use realloc instead of malloc+memcpy when growing a POD SmallVector. A smart

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realloc implementation can try to expand the allocated memory block in-place,
avoiding the copy.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105605 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2010-06-08 11:44:30 +00:00
parent e77ff11a34
commit d164d3d9e7
2 changed files with 16 additions and 12 deletions
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lib/Support/SmallVector.cpp
+12 -9
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@@ -21,15 +21,18 @@ void SmallVectorBase::grow_pod(size_t MinSizeInBytes, size_t TSize) {
size_t NewCapacityInBytes = 2 * capacity_in_bytes();
if (NewCapacityInBytes < MinSizeInBytes)
NewCapacityInBytes = MinSizeInBytes;
void *NewElts = operator new(NewCapacityInBytes);
// Copy the elements over. No need to run dtors on PODs.
memcpy(NewElts, this->BeginX, CurSizeBytes);
// If this wasn't grown from the inline copy, deallocate the old space.
if (!this->isSmall())
operator delete(this->BeginX);
void *NewElts;
if (this->isSmall()) {
NewElts = malloc(NewCapacityInBytes);
// Copy the elements over. No need to run dtors on PODs.
memcpy(NewElts, this->BeginX, CurSizeBytes);
} else {
// If this wasn't grown from the inline copy, grow the allocated space.
NewElts = realloc(this->BeginX, NewCapacityInBytes);
}
this->EndX = (char*)NewElts+CurSizeBytes;
this->BeginX = NewElts;
this->CapacityX = (char*)this->BeginX + NewCapacityInBytes;