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add ConstantRange::difference (to perform set difference/relative complement)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159352 91177308-0d34-0410-b5e6-96231b3b80d8
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Nuno Lopes
2012-06-28 16:10:13 +00:00
parent ceb5bc7df1
commit 62d7afad8f
3 changed files with 27 additions and 0 deletions
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6
lib/Support/ConstantRange.cpp
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@ -248,6 +248,12 @@ ConstantRange ConstantRange::subtract(const APInt &Val) const {
return ConstantRange(Lower - Val, Upper - Val);
}
/// \brief Subtract the specified range from this range (aka relative complement
/// of the sets).
ConstantRange ConstantRange::difference(const ConstantRange &CR) const {
return intersectWith(CR.inverse());
}
/// intersectWith - Return the range that results from the intersection of this
/// range with another range. The resultant range is guaranteed to include all
/// elements contained in both input ranges, and to have the smallest possible