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a few improvements:

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1. Use std::equal instead of reinventing it.
2. don't run dtors in destroy_range if element is pod-like.
3. Use isPodLike to decide between memcpy/uninitialized_copy 
   instead of is_class.  isPodLike is more generous in some cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91427 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-12-15 08:34:01 +00:00
parent 10aaf05c30
commit 4a5129c700
1 changed files with 8 additions and 10 deletions
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18
include/llvm/ADT/SmallVector.h
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@ -402,11 +402,7 @@ public:
bool operator==(const SmallVectorImpl &RHS) const {
if (size() != RHS.size()) return false;
for (const T *This = begin(), *That = RHS.begin(), *E = end();
This != E; ++This, ++That)
if (*This != *That)
return false;
return true;
return std::equal(begin(), end(), RHS.begin());
}
bool operator!=(const SmallVectorImpl &RHS) const { return !(*this == RHS); }
@ -440,7 +436,9 @@ private:
}
void destroy_range(T *S, T *E) {
// TODO: POD
// No need to do a destroy loop for POD's.
if (isPodLike<T>::value) return;
while (S != E) {
--E;
E->~T();
@ -459,11 +457,11 @@ void SmallVectorImpl<T>::grow(size_t MinSize) {
T *NewElts = static_cast<T*>(operator new(NewCapacity*sizeof(T)));
// Copy the elements over.
if (is_class<T>::value)
std::uninitialized_copy(begin(), end(), NewElts);
else
// Use memcpy for PODs (std::uninitialized_copy optimizes to memmove).
if (isPodLike<T>::value)
// Use memcpy for PODs: std::uninitialized_copy optimizes to memmove.
memcpy(NewElts, begin(), CurSize * sizeof(T));
else
std::uninitialized_copy(begin(), end(), NewElts);
// Destroy the original elements.
destroy_range(begin(), end());