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Implement udiv for ConstantRanges.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75413 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2009-07-12 05:18:18 +00:00
parent 69600cae95
commit 956daf0f7f
2 changed files with 35 additions and 17 deletions
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lib/Support/ConstantRange.cpp
+26 -4
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@@ -592,10 +592,32 @@ ConstantRange::umax(const ConstantRange &Other) const {
}
ConstantRange
ConstantRange::udiv(const ConstantRange &Other) const {
// TODO: Implement udiv.
return ConstantRange(getBitWidth(),
!(isEmptySet() || Other.isEmptySet()));
ConstantRange::udiv(const ConstantRange &RHS) const {
if (isEmptySet() || RHS.isEmptySet() || RHS.getUnsignedMax() == 0)
return ConstantRange(getBitWidth(), /*isFullSet=*/false);
if (RHS.isFullSet())
return ConstantRange(getBitWidth(), /*isFullSet=*/true);
APInt Lower = getUnsignedMin().udiv(RHS.getUnsignedMax());
APInt RHS_umin = RHS.getUnsignedMin();
if (RHS_umin == 0) {
// We want the lowest value in RHS excluding zero. Usually that would be 1
// except for a range in the form of [X, 1) in which case it would be X.
if (RHS.getUpper() == 1)
RHS_umin = RHS.getLower();
else
RHS_umin = APInt(getBitWidth(), 1);
}
APInt Upper = getUnsignedMax().udiv(RHS_umin) + 1;
// If the LHS is Full and the RHS is a wrapped interval containing 1 then
// this could occur.
if (Lower == Upper)
return ConstantRange(getBitWidth(), /*isFullSet=*/true);
return ConstantRange(Lower, Upper);
}
/// print - Print out the bounds to a stream...