LTO API: add lto_module_create_from_memory_with_path.

[oota-llvm.git] / include / llvm / Target / TargetInstrInfo.h

diff --git a/include/llvm/Target/TargetInstrInfo.h b/include/llvm/Target/TargetInstrInfo.h
index 7172eb0b6804cd56b0bf350e723499da0a1aa585..d4e14f60f237b175ed80a89756a36d76fbc38649 100644 (file)
--- a/include/llvm/Target/TargetInstrInfo.h
+++ b/include/llvm/Target/TargetInstrInfo.h
@@ -173,6 +173,31 @@ public:
                                    const MachineMemOperand *&MMO,
                                    int &FrameIndex) const;
 
+  /// isStackSlotCopy - Return true if the specified machine instruction
+  /// is a copy of one stack slot to another and has no other effect.
+  /// Provide the identity of the two frame indices.
+  virtual bool isStackSlotCopy(const MachineInstr *MI, int &DestFrameIndex,
+                               int &SrcFrameIndex) const {
+    return false;
+  }
+
+  /// Compute the size in bytes and offset within a stack slot of a spilled
+  /// register or subregister.
+  ///
+  /// \param [out] Size in bytes of the spilled value.
+  /// \param [out] Offset in bytes within the stack slot.
+  /// \returns true if both Size and Offset are successfully computed.
+  ///
+  /// Not all subregisters have computable spill slots. For example,
+  /// subregisters registers may not be byte-sized, and a pair of discontiguous
+  /// subregisters has no single offset.
+  ///
+  /// Targets with nontrivial bigendian implementations may need to override
+  /// this, particularly to support spilled vector registers.
+  virtual bool getStackSlotRange(const TargetRegisterClass *RC, unsigned SubIdx,
+                                 unsigned &Size, unsigned &Offset,
+                                 const TargetMachine *TM) const;
+
   /// reMaterialize - Re-issue the specified 'original' instruction at the
   /// specific location targeting a new destination register.
   /// The register in Orig->getOperand(0).getReg() will be substituted by
@@ -607,6 +632,8 @@ public:
     return false;
   }
 
+  virtual bool enableClusterLoads() const { return false; }
+
   virtual bool shouldClusterLoads(MachineInstr *FirstLdSt,
                                   MachineInstr *SecondLdSt,
                                   unsigned NumLoads) const {
@@ -813,6 +840,8 @@ public:
                                    const MachineInstr *MI,
                                    unsigned *PredCost = 0) const;
 
+  virtual unsigned getPredicationCost(const MachineInstr *MI) const;
+
   virtual int getInstrLatency(const InstrItineraryData *ItinData,
                               SDNode *Node) const;
 
@@ -930,6 +959,26 @@ public:
     return 0;
   }
 
+  /// \brief Return the minimum clearance before an instruction that reads an
+  /// unused register.
+  ///
+  /// For example, AVX instructions may copy part of an register operand into
+  /// the unused high bits of the destination register.
+  ///
+  /// vcvtsi2sdq %rax, %xmm0<undef>, %xmm14
+  ///
+  /// In the code above, vcvtsi2sdq copies %xmm0[127:64] into %xmm14 creating a
+  /// false dependence on any previous write to %xmm0.
+  ///
+  /// This hook works similarly to getPartialRegUpdateClearance, except that it
+  /// does not take an operand index. Instead sets \p OpNum to the index of the
+  /// unused register.
+  virtual unsigned getUndefRegClearance(const MachineInstr *MI, unsigned &OpNum,
+                                        const TargetRegisterInfo *TRI) const {
+    // The default implementation returns 0 for no undef register dependency.
+    return 0;
+  }
+
   /// breakPartialRegDependency - Insert a dependency-breaking instruction
   /// before MI to eliminate an unwanted dependency on OpNum.
   ///