[PATCH] D100088: [DAGCombiner] Fold step_vector with add/mul/shl

[JunMa via Phabricator via llvm-commits]

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This patch implements some DAG combines for STEP_VECTOR:
add step_vector(C1), step_vector(C2) -> step_vector(C1+C2)
add (add X step_vector(C1)), step_vector(C2) -> add X step_vector(C1+C2)
mul step_vector(C1), C2 -> step_vector(C1*C2)
shl step_vector(C1), C2 -> step_vector(C1<<C2)

TestPlan: check-llvm


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D100088

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/AArch64/sve-stepvector.ll

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