[PATCH] D118603: [DAGCombine] Add simple folds for SSHLSAT/USHLSAT

[Bjorn Pettersson via Phabricator via llvm-commits]

bjope created this revision.
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Do "simplifyShift" and "FoldConstantArithmetic" folds for the SSHLSAT
and USHLSAT DAG nodes.

This for example include folds such as:

  (shlsat 0, x) -> 0
  (shlsat x, 0) -> x
  (shlsat c1, c2) -> c3


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D118603

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  llvm/test/CodeGen/AArch64/sshl_sat.ll
  llvm/test/CodeGen/AArch64/ushl_sat.ll

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