[GlobalISel][X86] support G_FRAME_INDEX instruction selection.

    Summary:
    G_LOAD/G_STORE, add alternative RegisterBank mapping.
    For G_LOAD, Fast and Greedy mode choose the same RegisterBank mapping (GprRegBank ) for the G_GLOAD + G_FADD , can't get rid of cross register bank copy GprRegBank->VecRegBank.

    Reviewers: zvi, rovka, qcolombet, ab

    Reviewed By: zvi

    Subscribers: llvm-commits, dberris, kristof.beyls, eladcohen, guyblank

    Differential Revision: https://reviews.llvm.org/D30979

llvm-svn: 298907

1 files changed, 20 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86RegisterBankInfo.h b/llvm/lib/Target/X86/X86RegisterBankInfo.h
index 5fcce87a71e..aaa83920b6b 100644
--- a/llvm/lib/Target/X86/X86RegisterBankInfo.h
+++ b/llvm/lib/Target/X86/X86RegisterBankInfo.h
@@ -49,12 +49,32 @@ private:
   static InstructionMapping getSameOperandsMapping(const MachineInstr &MI,
                                                    bool isFP);
 
+  /// Track the bank of each instruction operand(register)
+  /// \return An instruction PartialMappingIdxs.
+  static void
+  getInstrPartialMappingIdxs(const MachineInstr &MI,
+                             const MachineRegisterInfo &MRI, const bool isFP,
+                             SmallVectorImpl<PartialMappingIdx> &OpRegBankIdx);
+
+  /// Construct the instruction ValueMapping from PartialMappingIdxs
+  /// \return true if mapping succeeded.
+  static bool
+  getInstrValueMapping(const MachineInstr &MI,
+                       const SmallVectorImpl<PartialMappingIdx> &OpRegBankIdx,
+                       SmallVectorImpl<const ValueMapping *> &OpdsMapping);
+
 public:
   X86RegisterBankInfo(const TargetRegisterInfo &TRI);
 
   const RegisterBank &
   getRegBankFromRegClass(const TargetRegisterClass &RC) const override;
 
+  InstructionMappings
+  getInstrAlternativeMappings(const MachineInstr &MI) const override;
+
+  /// See RegisterBankInfo::applyMapping.
+  void applyMappingImpl(const OperandsMapper &OpdMapper) const override;
+
   InstructionMapping getInstrMapping(const MachineInstr &MI) const override;
 };