Typo.

[oota-llvm.git] / lib / CodeGen / VirtRegMap.h

diff --git a/lib/CodeGen/VirtRegMap.h b/lib/CodeGen/VirtRegMap.h
index 5b06c01bfdf7c99ba0c7716b603b48a3ea2853d3..f6d305e494f4773acb562d7a4bee7a85fd1364d7 100644 (file)
--- a/lib/CodeGen/VirtRegMap.h
+++ b/lib/CodeGen/VirtRegMap.h
@@ -18,16 +18,24 @@
 #define LLVM_CODEGEN_VIRTREGMAP_H
 
 #include "llvm/Target/MRegisterInfo.h"
+#include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/IndexedMap.h"
 #include "llvm/Support/Streams.h"
 #include <map>
 
 namespace llvm {
   class MachineInstr;
+  class MachineFunction;
   class TargetInstrInfo;
 
   class VirtRegMap {
   public:
+    enum {
+      NO_PHYS_REG = 0,
+      NO_STACK_SLOT = (1L << 30)-1,
+      MAX_STACK_SLOT = (1L << 18)-1
+    };
+
     enum ModRef { isRef = 1, isMod = 2, isModRef = 3 };
     typedef std::multimap<MachineInstr*,
                           std::pair<unsigned, ModRef> > MI2VirtMapTy;
@@ -47,22 +55,29 @@ namespace llvm {
     /// which corresponds to the stack slot this register is spilled
     /// at.
     IndexedMap<int, VirtReg2IndexFunctor> Virt2StackSlotMap;
+    IndexedMap<int, VirtReg2IndexFunctor> Virt2ReMatIdMap;
     /// MI2VirtMap - This is MachineInstr to virtual register
     /// mapping. In the case of memory spill code being folded into
     /// instructions, we need to know which virtual register was
     /// read/written by this instruction.
     MI2VirtMapTy MI2VirtMap;
 
+    /// ReMatMap - This is virtual register to re-materialized instruction
+    /// mapping. Each virtual register whose definition is going to be
+    /// re-materialized has an entry in it.
+    IndexedMap<MachineInstr*, VirtReg2IndexFunctor> ReMatMap;
+
+    /// ReMatId - Instead of assigning a stack slot to a to be rematerialized
+    /// virtual register, an unique id is being assigned. This keeps track of
+    /// the highest id used so far. Note, this starts at (1<<18) to avoid
+    /// conflicts with stack slot numbers.
+    int ReMatId;
+
     VirtRegMap(const VirtRegMap&);     // DO NOT IMPLEMENT
     void operator=(const VirtRegMap&); // DO NOT IMPLEMENT
 
-    enum {
-      NO_PHYS_REG = 0,
-      NO_STACK_SLOT = ~0 >> 1
-    };
-
   public:
-    VirtRegMap(MachineFunction &mf);
+    explicit VirtRegMap(MachineFunction &mf);
 
     void grow();
 
@@ -105,10 +120,11 @@ namespace llvm {
       grow();
     }
 
-    /// @brief returns true is the specified virtual register is
-    /// mapped to a stack slot
-    bool hasStackSlot(unsigned virtReg) const {
-      return getStackSlot(virtReg) != NO_STACK_SLOT;
+    /// @brief returns true is the specified virtual register is not
+    /// mapped to a stack slot or rematerialized.
+    bool isAssignedReg(unsigned virtReg) const {
+      return getStackSlot(virtReg) == NO_STACK_SLOT &&
+        getReMatId(virtReg) == NO_STACK_SLOT;
     }
 
     /// @brief returns the stack slot mapped to the specified virtual
@@ -118,6 +134,13 @@ namespace llvm {
       return Virt2StackSlotMap[virtReg];
     }
 
+    /// @brief returns the rematerialization id mapped to the specified virtual
+    /// register
+    int getReMatId(unsigned virtReg) const {
+      assert(MRegisterInfo::isVirtualRegister(virtReg));
+      return Virt2ReMatIdMap[virtReg];
+    }
+
     /// @brief create a mapping for the specifed virtual register to
     /// the next available stack slot
     int assignVirt2StackSlot(unsigned virtReg);
@@ -125,12 +148,43 @@ namespace llvm {
     /// the specified stack slot
     void assignVirt2StackSlot(unsigned virtReg, int frameIndex);
 
+    /// @brief assign an unique re-materialization id to the specified
+    /// virtual register.
+    int assignVirtReMatId(unsigned virtReg);
+    /// @brief assign an unique re-materialization id to the specified
+    /// virtual register.
+    void assignVirtReMatId(unsigned virtReg, int id);
+
+    /// @brief returns true if the specified virtual register is being
+    /// re-materialized.
+    bool isReMaterialized(unsigned virtReg) const {
+      return ReMatMap[virtReg] != NULL;
+    }
+
+    /// @brief returns the original machine instruction being re-issued
+    /// to re-materialize the specified virtual register.
+    MachineInstr *getReMaterializedMI(unsigned virtReg) const {
+      return ReMatMap[virtReg];
+    }
+
+    /// @brief records the specified virtual register will be
+    /// re-materialized and the original instruction which will be re-issed
+    /// for this purpose.  If parameter all is true, then all uses of the
+    /// registers are rematerialized and it's safe to delete the definition.
+    void setVirtIsReMaterialized(unsigned virtReg, MachineInstr *def) {
+      ReMatMap[virtReg] = def;
+    }
+
     /// @brief Updates information about the specified virtual register's value
     /// folded into newMI machine instruction.  The OpNum argument indicates the
     /// operand number of OldMI that is folded.
     void virtFolded(unsigned VirtReg, MachineInstr *OldMI, unsigned OpNum,
                     MachineInstr *NewMI);
 
+    /// @brief Updates information about the specified virtual register's value
+    /// folded into the specified machine instruction.
+    void virtFolded(unsigned VirtReg, MachineInstr *MI, ModRef MRInfo);
+
     /// @brief returns the virtual registers' values folded in memory
     /// operands of this instruction
     std::pair<MI2VirtMapTy::const_iterator, MI2VirtMapTy::const_iterator>