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Multiply was very wrong for wrapped ranges. This supplies a half-fix that will

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generally return Full on all wrapped inputs. "Fixes" PR4545.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75444 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2009-07-13 03:27:41 +00:00
parent cf9e07dea8
commit f1db120d04
2 changed files with 11 additions and 6 deletions
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12
lib/Support/ConstantRange.cpp
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@@ -557,13 +557,13 @@ ConstantRange::multiply(const ConstantRange &Other) const {
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);
APInt this_min = getUnsignedMin().zext(getBitWidth() * 2);
APInt this_max = getUnsignedMax().zext(getBitWidth() * 2);
APInt Other_min = Other.getUnsignedMin().zext(getBitWidth() * 2);
APInt Other_max = Other.getUnsignedMax().zext(getBitWidth() * 2);
ConstantRange Result_zext = ConstantRange(this_min * Other_min,
this_max * Other_max + 1);
return Result_zext.truncate(getBitWidth());
}