Create a new class, MemOperand, for describing memory references

in the backend. Introduce a new SDNode type, MemOperandSDNode, for
holding a MemOperand in the SelectionDAG IR, and add a MemOperand
list to MachineInstr, and code to manage them. Remove the offset
field from SrcValueSDNode; uses of SrcValueSDNode that were using
it are all all using MemOperandSDNode now.

Also, begin updating some getLoad and getStore calls to use the
PseudoSourceValue objects.

Most of this was written by Florian Brander, some
reorganization and updating to TOT by me.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46585 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 20 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/MachineInstr.h b/include/llvm/CodeGen/MachineInstr.h
index 068c335c7d..5f3838787e 100644
--- a/include/llvm/CodeGen/MachineInstr.h
+++ b/include/llvm/CodeGen/MachineInstr.h
@@ -17,6 +17,7 @@
 #define LLVM_CODEGEN_MACHINEINSTR_H
 
 #include "llvm/CodeGen/MachineOperand.h"
+#include "llvm/CodeGen/MemOperand.h"
 
 namespace llvm {
 
@@ -35,6 +36,7 @@ class MachineInstr {
                                         // are determined at construction time).
 
   std::vector<MachineOperand> Operands; // the operands
+  std::vector<MemOperand> MemOperands;  // information on memory references
   MachineInstr *Prev, *Next;            // Links for MBB's intrusive list.
   MachineBasicBlock *Parent;            // Pointer to the owning basic block.
 
@@ -94,6 +96,18 @@ public:
   ///
   unsigned getNumExplicitOperands() const;
   
+  /// Access to memory operands of the instruction
+  unsigned getNumMemOperands() const { return MemOperands.size(); }
+
+  const MemOperand& getMemOperand(unsigned i) const {
+    assert(i < getNumMemOperands() && "getMemOperand() out of range!");
+    return MemOperands[i];
+  }
+  MemOperand& getMemOperand(unsigned i) {
+    assert(i < getNumMemOperands() && "getMemOperand() out of range!");
+    return MemOperands[i];
+  }
+
   /// isIdenticalTo - Return true if this instruction is identical to (same
   /// opcode and same operands as) the specified instruction.
   bool isIdenticalTo(const MachineInstr *Other) const {
@@ -192,6 +206,12 @@ public:
   ///
   void RemoveOperand(unsigned i);
 
+  /// addMemOperand - Add a MemOperand to the machine instruction, referencing
+  /// arbitrary storage.
+  void addMemOperand(const MemOperand &MO) {
+    MemOperands.push_back(MO);
+  }
+
 private:
   /// getRegInfo - If this instruction is embedded into a MachineFunction,
   /// return the MachineRegisterInfo object for the current function, otherwise