[SLP]: Infer identity operation when there are vec_sz-1 isomorphic instructions. #143583
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Change-Id: Ibc0e74804e40ad7c17dffc4f217a25d94f832cfe
…tructions Change-Id: Iba09dc8a4b7fe851b34c6405236ea72dd75a7953
Change-Id: Ib32faccfafde6ab9793320eb7bf8d27bc8f14ec0
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When there are vec_sz-1 scalar isomorphic instructions,
create identity operation if it's feasible, so that we can
have vec_sz of instructions which increases the vectorization opportunities.
ex of operations that have identity:
add i32 %x, 0
lshr i32 %x, 0