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Miscellaneous Fixes for SparseBitVector

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Summary:

1. Fix return value in `SparseBitVector::operator&=`.
2. Add checks if SBV is being assigned is invoking SBV.

Reviewers: dberlin

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D11342

Committed on behalf of sl@

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242693 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Berlin
2015-07-20 18:26:23 +00:00
parent d20688a1eb
commit 1cc7da7305
2 changed files with 125 additions and 1 deletions
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32
include/llvm/ADT/SparseBitVector.h
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@ -453,6 +453,9 @@ public:
// Assignment
SparseBitVector& operator=(const SparseBitVector& RHS) {
if (this == &RHS)
return *this;
Elements.clear();
ElementListConstIter ElementIter = RHS.Elements.begin();
@ -559,6 +562,9 @@ public:
// Union our bitmap with the RHS and return true if we changed.
bool operator|=(const SparseBitVector &RHS) {
if (this == &RHS)
return false;
bool changed = false;
ElementListIter Iter1 = Elements.begin();
ElementListConstIter Iter2 = RHS.Elements.begin();
@ -587,6 +593,9 @@ public:
// Intersect our bitmap with the RHS and return true if ours changed.
bool operator&=(const SparseBitVector &RHS) {
if (this == &RHS)
return false;
bool changed = false;
ElementListIter Iter1 = Elements.begin();
ElementListConstIter Iter2 = RHS.Elements.begin();
@ -619,9 +628,13 @@ public:
ElementListIter IterTmp = Iter1;
++Iter1;
Elements.erase(IterTmp);
changed = true;
}
}
Elements.erase(Iter1, Elements.end());
if (Iter1 != Elements.end()) {
Elements.erase(Iter1, Elements.end());
changed = true;
}
CurrElementIter = Elements.begin();
return changed;
}
@ -629,6 +642,14 @@ public:
// Intersect our bitmap with the complement of the RHS and return true
// if ours changed.
bool intersectWithComplement(const SparseBitVector &RHS) {
if (this == &RHS) {
if (!empty()) {
clear();
return true;
}
return false;
}
bool changed = false;
ElementListIter Iter1 = Elements.begin();
ElementListConstIter Iter2 = RHS.Elements.begin();
@ -675,6 +696,15 @@ public:
void intersectWithComplement(const SparseBitVector<ElementSize> &RHS1,
const SparseBitVector<ElementSize> &RHS2)
{
if (this == &RHS1) {
intersectWithComplement(RHS2);
return;
} else if (this == &RHS2) {
SparseBitVector RHS2Copy(RHS2);
intersectWithComplement(RHS1, RHS2Copy);
return;
}
Elements.clear();
CurrElementIter = Elements.begin();
ElementListConstIter Iter1 = RHS1.Elements.begin();