[all-commits] [llvm/llvm-project] 06105f: Pre-commit test cases missing SSHLSAT/USHLSAT fold...

[Björn Pettersson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 06105f2ef1a9278d16e916d5f011731ad73f6abd
      https://github.com/llvm/llvm-project/commit/06105f2ef1a9278d16e916d5f011731ad73f6abd
  Author: Bjorn Pettersson <bjorn.a.pettersson at ericsson.com>
  Date:   2022-02-01 (Tue, 01 Feb 2022)

  Changed paths:
    A llvm/test/CodeGen/AArch64/sshl_sat.ll
    A llvm/test/CodeGen/AArch64/ushl_sat.ll

  Log Message:
  -----------
  Pre-commit test cases missing SSHLSAT/USHLSAT folds. NFC


  Commit: 38858790467e5e8d9e7894b26c0d05ec4516c4cb
      https://github.com/llvm/llvm-project/commit/38858790467e5e8d9e7894b26c0d05ec4516c4cb
  Author: Bjorn Pettersson <bjorn.a.pettersson at ericsson.com>
  Date:   2022-02-01 (Tue, 01 Feb 2022)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
    M llvm/test/CodeGen/AArch64/sshl_sat.ll
    M llvm/test/CodeGen/AArch64/ushl_sat.ll

  Log Message:
  -----------
  [DAGCombine] Add simple folds for SSHLSAT/USHLSAT

Do "simplifyShift" and "FoldConstantArithmetic" folds for the SSHLSAT
and USHLSAT DAG nodes.

This includes folds such as:
  (shlsat undef/poison, x) -> 0
  (shlsat x, undef/poison) -> undef
  (shlsat x, too_large_shamt) -> undef
  (shlsat 0, x) -> 0
  (shlsat x, 0) -> x
  (shlsat c1, c2) -> c3

Differential Revision: https://reviews.llvm.org/D118603


Compare: https://github.com/llvm/llvm-project/compare/7fe4fa9a0a9b...38858790467e