[PATCH] D68717: [Codegen] More add_sat and sub_sat promotion

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: nikic, craig.topper, RKSimon, leonardchan.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.

As a continuation of D68643 <https://reviews.llvm.org/D68643>, the default promotion for saturation arithmetic can be further refined when MIN/MAX are known to be legal. All the test changes here are in uncommon types like a i4.

This uses isOperationLegal, as opposed to legal or custom because the X86 MINs/MAXs are custom lowered. Some of the MVE tests look larger because they are materialising constants (I imagine they might be pulled out of a loop).


https://reviews.llvm.org/D68717

Files:
  llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
  llvm/test/CodeGen/Thumb2/mve-saturating-arith.ll
  llvm/test/CodeGen/X86/sadd_sat_vec.ll
  llvm/test/CodeGen/X86/ssub_sat_vec.ll
  llvm/test/CodeGen/X86/uadd_sat_vec.ll
  llvm/test/CodeGen/X86/usub_sat_vec.ll

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