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Implement unionWith. 

llvm-svn: 34833
This commit is contained in:
Nick Lewycky 2007-03-02 03:33:05 +00:00
parent 4bd8cda3f0
commit cf87f9eef5
1 changed files with 11 additions and 2 deletions
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13
llvm/lib/Support/ConstantRange.cpp
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@ -194,9 +194,18 @@ ConstantRange ConstantRange::unionWith(const ConstantRange &CR) const {
assert(getBitWidth() == CR.getBitWidth() &&
"ConstantRange types don't agree!");
assert(0 && "Range union not implemented yet!");
if ( isFullSet() || CR.isEmptySet()) return *this;
if (CR.isFullSet() || isEmptySet()) return CR;
return *this;
APInt L = Lower, U = Upper;
if (!contains(CR.Lower))
L = APIntOps::umin(L, CR.Lower);
if (!contains(CR.Upper - 1))
U = APIntOps::umax(U, CR.Upper);
return ConstantRange(L, U);
}
/// zeroExtend - Return a new range in the specified integer type, which must