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These atomic operations are conceptually both a load and store from the same location. As such, we can treat them as the most conservative of those two components which in practice, means we can treat them like stores. An cmpxchg or atomicrmw captures the values, but not the locations accessed. Note: We can probably be more aggressive about the comparison value in an cmpxhg since to have it be in memory, it must already be captured, but I figured it was better to avoid that for the moment. Note 2: It turns out that since we don't actually support cmpxchg of pointer type, writing a negative test is impossible. Differential Revision: http://reviews.llvm.org/D17400 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@261245 91177308-0d34-0410-b5e6-96231b3b80d8 |
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