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If we have ~(~X & Y), it only makes sense to transform it to (X | ~Y) when we do not need the intermediate (~X & Y) value. In that case, we would need an extra instruction to generate ~Y + 'or' (as shown in the test changes). It's ok if we have multiple uses of ~X or Y, however. In those cases, we may not reduce the instruction count or critical path, but we might improve throughput because we can generate ~X and ~Y in parallel. Whether that actually makes perf sense or not for a target is something we can't answer in IR. Differential Revision: https://reviews.llvm.org/D32703 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301848 91177308-0d34-0410-b5e6-96231b3b80d8
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