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Diffstat (limited to 'lib/Transforms/Instrumentation/MemorySanitizer.cpp')
| -rw-r--r-- | lib/Transforms/Instrumentation/MemorySanitizer.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Transforms/Instrumentation/MemorySanitizer.cpp b/lib/Transforms/Instrumentation/MemorySanitizer.cpp index 64882c284b..a329dcc6be 100644 --- a/lib/Transforms/Instrumentation/MemorySanitizer.cpp +++ b/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), |