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DenseMap<uintptr_t,...> doesn't allow all values as keys.

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Avoid colliding with the sentinels, hopefully unbreaking
llvm-gcc-x86_64-linux-selfhost.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126982 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-03-04 02:48:56 +00:00
parent a0807f57ca
commit 2bc2a08b1b
1 changed files with 2 additions and 0 deletions
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2
lib/Transforms/Utils/Local.cpp
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@ -632,6 +632,8 @@ bool llvm::EliminateDuplicatePHINodes(BasicBlock *BB) {
Hash ^= reinterpret_cast<uintptr_t>(static_cast<Value *>(*I));
Hash = (Hash << 7) | (Hash >> (sizeof(uintptr_t) * CHAR_BIT - 7));
}
// Avoid colliding with the DenseMap sentinels ~0 and ~0-1.
Hash >>= 1;
// If we've never seen this hash value before, it's a unique PHI.
std::pair<DenseMap<uintptr_t, PHINode *>::iterator, bool> Pair =
HashMap.insert(std::make_pair(Hash, PN));