[PATCH] D74782: [llvm][CodeGen] DAG Combiner folds for vscale.

[Francesco Petrogalli via Phabricator via llvm-commits]

fpetrogalli created this revision.
fpetrogalli added reviewers: efriedma, sdesmalen, andwar.
Herald added subscribers: llvm-commits, hiraditya.
Herald added a project: LLVM.

This patch simplifies the DAGs generated when using the intrinsic
`@llvm.vscale.*` as follows:

- Fold (add (vscale * C0), (vscale * C1)) to (vscale * C0 + C1)).
- Canonicalize (sub X, (vscale * C)) to (add X,  (vscale * -C)).
- Fold (mul (vscale * C0), C1) to (vscale * (C0 * C1))).
- Fold (shl (vscale * C0), C1) to (vscale * (C0 << C1))).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D74782

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

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