[PATCH] D54698: [SelectionDAG] Initial support for FSHL/FSHR funnel shift opcodes (PR39467)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: spatel, craig.topper, efriedma.

This is an initial patch to add a minimum level of support for funnel shifts to the SelectionDAG and to begin wiring it up to the X86 SHLD/SHRD instructions.

Some partial legalization code has been added to handle the case for 'SlowSHLD' where we want to expand instead and I've added a few DAG combines so we don't get regressions from the existing DAG builder expansion code.


Repository:
  rL LLVM

https://reviews.llvm.org/D54698

Files:
  include/llvm/CodeGen/ISDOpcodes.h
  include/llvm/CodeGen/TargetLowering.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
  lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  lib/CodeGen/TargetLoweringBase.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86TargetTransformInfo.cpp
  test/CodeGen/X86/fshl.ll
  test/CodeGen/X86/fshr.ll
  test/CodeGen/X86/funnel-shift.ll

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