Sanjay Patel e239198cdb [InstCombine] fold select shuffles with shared operand together ...

We don't combine generic shuffles together in IR, but select
shuffles are a special-case because a select shuffle of a
select shuffle is just another select shuffle; codegen is
expected to efficiently lower those (select shuffles are also
the canonical form of a vector select with constant condition).

2022-09-28 11:56:27 -04:00

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