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2017 May 15
2
Disabling DAGCombine's specific optimization
Hello LLVM Developers, I am working on an architecture which have one bit shift operation if barrel shiftier hardware is not present in such cases some DAGCombine optimizations reduces performance of certain benchmarks upto 5% for example consider follwing optimization: fold (select_cc seteq (and x, y), 0, 0, A) -> (and (shr (shl x)) A) Here it introduce 2 shift operations and when barrel