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Implement ConstantRange::multiply based on the code in LoopVR.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75410 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2009-07-12 02:19:05 +00:00
parent 6db1495558
commit 2ff893f486
2 changed files with 19 additions and 13 deletions
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lib/Support/ConstantRange.cpp
+13 -3
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@@ -550,9 +550,19 @@ ConstantRange::add(const ConstantRange &Other) const {
ConstantRange
ConstantRange::multiply(const ConstantRange &Other) const {
// TODO: Implement multiply.
return ConstantRange(getBitWidth(),
!(isEmptySet() || Other.isEmptySet()));
if (isEmptySet() || Other.isEmptySet())
return ConstantRange(getBitWidth(), /*isFullSet=*/false);
if (isFullSet() || Other.isFullSet())
return ConstantRange(getBitWidth(), /*isFullSet=*/true);
ConstantRange this_zext = zeroExtend(getBitWidth() * 2);
ConstantRange Other_zext = Other.zeroExtend(getBitWidth() * 2);
ConstantRange Result_zext = ConstantRange(
this_zext.getLower() * Other_zext.getLower(),
((this_zext.getUpper()-1) * (Other_zext.getUpper()-1)) + 1);
return Result_zext.truncate(getBitWidth());
}
ConstantRange