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[X86][SSE] Fold EXTEND_VECTOR_INREG(EXTRACT_SUBVECTOR(EXTEND(X),0)) ->…

Authored by RKSimon on Sep 20 2020, 10:38 AM.

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[X86][SSE] Fold EXTEND_VECTOR_INREG(EXTRACT_SUBVECTOR(EXTEND(X),0)) -> EXTEND_VECTOR_INREG(X)

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Committed
RKSimonSep 20 2020, 10:39 AM
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rGbb0078e5911a: [X86][SSE] Fold SIGN_EXTEND(SIGN_EXTEND_VECTOR_INREG(X)) ->…
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