Simon Pilgrim 7dbfcfa735 [DAG] combineInsertEltToShuffle - if EXTRACT_VECTOR_ELT fails to match an existing shuffle op, try to replace an undef op if there is one.
This should fix a number of shuffle regressions in D127115 where the re-ordered combines mean we fail to fold a EXTRACT_VECTOR_ELT/INSERT_VECTOR_ELT sequence into a BUILD_VECTOR if we extract from more than one vector source.
2022-06-09 14:56:14 +01:00
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