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96c8735e28
Requires a lot less code and complexity on loop-idiom's side and the more precise analysis can catch more cases, like the one I included as a test case. This also fixes the edge-case miscompilation from PR9481. Compile time performance seems to be slightly worse, but this is mostly due to an extra LCSSA run scheduled by the PassManager and should be fixed there. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166874 91177308-0d34-0410-b5e6-96231b3b80d8
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