[InstCombine] foldVecExtTruncToExtElt - extend to handle trunc(lshr(extractelement(x,c1),c2)) -> extractelement(bitcast(x),c3) patterns.#109689

Merged

RKSimon merged 6 commits intollvm:mainfrom

RKSimon:instcombine-trunc-extractelement

Sep 28, 2024

Commits on Sep 28, 2024

[InstCombine] Move into trunc+extractlement -> extractelement+bitcast fold into foldVecExtTruncToExtElt helper. NFC.
RKSimon
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[InstCombine] Add tests for trunc+lshr+extractlement -> extractelement+bitcast fold for #107404
RKSimon
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[InstCombine] foldVecExtTruncToExtElt - extend to handle trunc(lshr(extractelement(x,c1),c2)) -> extractelement(bitcast(x),c3) patterns.
RKSimon
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Fix header comment to appease doxygen
RKSimon
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Update comment to describe trunc(lshr(extractelement(x,c1),c2)) pattern as well
RKSimon
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Remove NFC refactor of BE element scaling
RKSimon
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