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Bugfixes for smallvector when the element size is small and N is small.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29720 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-08-16 01:23:31 +00:00
parent 103febea8e
commit 2e6baf626d
1 changed files with 17 additions and 4 deletions
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21
include/llvm/ADT/SmallVector.h
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@ -228,17 +228,30 @@ class SmallVector : public SmallVectorImpl<T> {
/// InlineElts - These are 'N-1' elements that are stored inline in the body
/// of the vector. The extra '1' element is stored in SmallVectorImpl.
typedef typename SmallVectorImpl<T>::U U;
U InlineElts[(sizeof(T)*N+sizeof(U)-1)/sizeof(U) - 1];
enum {
// MinUs - The number of U's require to cover N T's.
MinUs = (sizeof(T)*N+sizeof(U)-1)/sizeof(U),
// NumInlineEltsElts - The number of elements actually in this array. There
// is already one in the parent class, and we have to round up to avoid
// having a zero-element array.
NumInlineEltsElts = (MinUs - 1) > 0 ? (MinUs - 1) : 1,
// NumTsAvailable - The number of T's we actually have space for, which may
// be more than N due to rounding.
NumTsAvailable = (NumInlineEltsElts+1)*sizeof(U) / sizeof(T)
};
U InlineElts[NumInlineEltsElts];
public:
SmallVector() : SmallVectorImpl<T>(N) {
SmallVector() : SmallVectorImpl<T>(NumTsAvailable) {
}
template<typename ItTy>
SmallVector(ItTy S, ItTy E) : SmallVectorImpl<T>(N) {
SmallVector(ItTy S, ItTy E) : SmallVectorImpl<T>(NumTsAvailable) {
append(S, E);
}
SmallVector(const SmallVector &RHS) : SmallVectorImpl<T>(N) {
SmallVector(const SmallVector &RHS) : SmallVectorImpl<T>(NumTsAvailable) {
operator=(RHS);
}
};