llvm/llvm-project
[DAG] Add MVT:changeVectorElementCount and EVT::changeVectorElementCount
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#174,584 opened on 2026/01/06
good first issuellvm:SelectionDAG
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説明
Similar to EVT::changeVectorElementType - but this will allow us to adjust the ElementCount on the fly.
We should assert that the original type was a vector already, but we will need to support Simple<->Extended transitions similar to EVT::changeVectorElementType.
There are a number of EVT::getVectorVT() calls in DAGCombine that would benefit from converting to changeVectorElementCount for clarity, but don't attempt to do too many in an initial patch