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26b4602681
In case of COPY-like instruction we may be able to deduce that a certain input is unused, based on the used lanes of the register defined by the instruction. This even works accross otherwise incompatible copies (no need to have compatible lanemasks, completely unused operands are still completely unused). It even makes sense to redo the analysis in this case since we gained information for a case we previously stopped at because of the incompatible masks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268815 91177308-0d34-0410-b5e6-96231b3b80d8 |
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