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| author | Nuno Lopes <nunoplopes@sapo.pt> | 2012-07-03 21:15:40 +0000 |
|---|---|---|
| committer | Nuno Lopes <nunoplopes@sapo.pt> | 2012-07-03 21:15:40 +0000 |
| commit | 0d44a504260ca64db82f46b4ba770f48a5fb9d09 (patch) | |
| tree | 1cb69059833e03e157228028b81d4508bf27db12 /llvm/lib/Analysis/ValueTracking.cpp | |
| parent | c8a0ce0a7ad3983443ea49e6bece28ae1d0ffece (diff) | |
| download | bcm5719-llvm-0d44a504260ca64db82f46b4ba770f48a5fb9d09.tar.gz bcm5719-llvm-0d44a504260ca64db82f46b4ba770f48a5fb9d09.zip | |
PHINode::hasConstantValue(): return undef if the PHI is fully recursive.
Thanks Duncan for the idea
llvm-svn: 159687
Diffstat (limited to 'llvm/lib/Analysis/ValueTracking.cpp')
| -rw-r--r-- | llvm/lib/Analysis/ValueTracking.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp index d245783ec65..cea34e16e7b 100644 --- a/llvm/lib/Analysis/ValueTracking.cpp +++ b/llvm/lib/Analysis/ValueTracking.cpp @@ -694,7 +694,7 @@ void llvm::ComputeMaskedBits(Value *V, APInt &KnownZero, APInt &KnownOne, // taking conservative care to avoid excessive recursion. if (Depth < MaxDepth - 1 && !KnownZero && !KnownOne) { // Skip if every incoming value references to ourself. - if (P->hasConstantValue() == P) + if (dyn_cast_or_null<UndefValue>(P->hasConstantValue())) break; KnownZero = APInt::getAllOnesValue(BitWidth); |
