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It is not safe to use normal LDR instructions because they may be reordered by the scheduler. The ATOMIC_LDR pseudos have a mayStore flag that prevents reordering. Atomic loads are also prevented from participating in rematerialization and load folding. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162713 91177308-0d34-0410-b5e6-96231b3b80d8
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