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df08543f48
Optimize concat_vectors of truncated vectors, where the intermediate type is illegal, to avoid said illegality, e.g., (v4i16 (concat_vectors (v2i16 (truncate (v2i64))), (v2i16 (truncate (v2i64))))) -> (v4i16 (truncate (v4i32 (concat_vectors (v2i32 (truncate (v2i64))), (v2i32 (truncate (v2i64))))))) This isn't really target-specific, and, as such, would best go in the DAGCombiner. However, ISD::TRUNCATE legality isn't keyed on both input and result type, so we might generate worse code when we don't know better. On AArch64 we know it's fine for v2i64->v4i16 and v4i32->v8i8. rdar://20022387 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232459 91177308-0d34-0410-b5e6-96231b3b80d8 |
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