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| author | Duncan Sands <baldrick@free.fr> | 2011-01-25 15:14:15 +0000 |
|---|---|---|
| committer | Duncan Sands <baldrick@free.fr> | 2011-01-25 15:14:15 +0000 |
| commit | 227fba11ca168225d913d1cea94a05b883092e76 (patch) | |
| tree | d6136703e166796c5838748f745ad92d120fe0be /lib | |
| parent | afde5188f2a97bd776e1349fe78801d67e187136 (diff) | |
| download | external_llvm-227fba11ca168225d913d1cea94a05b883092e76.zip external_llvm-227fba11ca168225d913d1cea94a05b883092e76.tar.gz external_llvm-227fba11ca168225d913d1cea94a05b883092e76.tar.bz2 | |
In which I discover that zero+zero is zero, d'oh!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124188 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Analysis/ValueTracking.cpp | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp index 98b4489..5320fa0 100644 --- a/lib/Analysis/ValueTracking.cpp +++ b/lib/Analysis/ValueTracking.cpp @@ -740,10 +740,10 @@ bool llvm::isKnownNonZero(Value *V, const TargetData *TD, unsigned Depth) { ComputeSignBit(Y, YKnownNonNegative, YKnownNegative, TD, Depth); // If X and Y are both non-negative (as signed values) then their sum is not - // zero. + // zero unless both X and Y are zero. if (XKnownNonNegative && YKnownNonNegative) - return false; -// return true; + if (isKnownNonZero(X, TD, Depth) || isKnownNonZero(Y, TD, Depth)) + return true; // If X and Y are both negative (as signed values) then their sum is not // zero unless both X and Y equal INT_MIN. |