[PATCH] D119819: [ARM] Recognize SSAT and USAT from SMIN/SMAX

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: samtebbs, SjoerdMeijer, ostannard, simon_tatham.
Herald added subscribers: armkevincheng, eric-k256, zzheng, hiraditya, kristof.beyls.
Herald added a reviewer: sjarus.
dmgreen requested review of this revision.
Herald added a project: LLVM.

We have some recognition of SSAT and USAT from SELECT_CC at the moment. This extends the matching to SMIN/SMAX which can help catch more cases, either from min/max being the canonical form in instcombine or from some expanded nodes like fp_to_si_sat.


https://reviews.llvm.org/D119819

Files:
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/test/CodeGen/ARM/fpclamptosat.ll
  llvm/test/CodeGen/ARM/sadd_sat.ll
  llvm/test/CodeGen/ARM/sadd_sat_plus.ll
  llvm/test/CodeGen/ARM/ssat-unroll-loops.ll
  llvm/test/CodeGen/ARM/ssat.ll
  llvm/test/CodeGen/ARM/ssub_sat.ll
  llvm/test/CodeGen/ARM/ssub_sat_plus.ll
  llvm/test/CodeGen/ARM/usat.ll

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