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[msan] A comment on ICmp handling logic. 

llvm-svn: 173453
This commit is contained in:
Evgeniy Stepanov 2013-01-25 15:35:29 +00:00
parent fac8403249
commit 2cb0fa10c2
1 changed files with 3 additions and 0 deletions
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3
llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
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@ -1211,6 +1211,9 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
A = IRB.CreatePointerCast(A, Sa->getType());
B = IRB.CreatePointerCast(B, Sb->getType());
// Let [a0, a1] be the interval of possible values of A, taking into account
// its undefined bits. Let [b0, b1] be the interval of possible values of B.
// Then (A cmp B) is defined iff (a0 cmp b1) == (a1 cmp b0).
bool IsSigned = I.isSigned();
Value *S1 = IRB.CreateICmp(I.getPredicate(),
getLowestPossibleValue(IRB, A, Sa, IsSigned),