diff options
| author | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2013-01-25 15:35:29 +0000 |
|---|---|---|
| committer | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2013-01-25 15:35:29 +0000 |
| commit | 2cb0fa10c2cbf617d680c6852417d5b9622c7606 (patch) | |
| tree | f6bccf296451b9bf3034157bccefdc81a16d0f45 /llvm/lib/Transforms | |
| parent | fac8403249ff180c2d2566b5b6476d1e9d588a8b (diff) | |
| download | bcm5719-llvm-2cb0fa10c2cbf617d680c6852417d5b9622c7606.tar.gz bcm5719-llvm-2cb0fa10c2cbf617d680c6852417d5b9622c7606.zip | |
[msan] A comment on ICmp handling logic.
llvm-svn: 173453
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp index 64882c284b3..a329dcc6bee 100644 --- a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp +++ b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp @@ -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), |
