Spiller now remove unused spill slots.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47657 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/VirtRegMap.h b/lib/CodeGen/VirtRegMap.h
index a7f47de..d1c14f6 100644
--- a/lib/CodeGen/VirtRegMap.h
+++ b/lib/CodeGen/VirtRegMap.h
@@ -20,6 +20,7 @@
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/IndexedMap.h"
+#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Support/Streams.h"
#include <map>
@@ -98,6 +99,12 @@
/// conflicts with stack slot numbers.
int ReMatId;
+ /// LowSpillSlot, HighSpillSlot - Lowest and highest spill slot indexes.
+ int LowSpillSlot, HighSpillSlot;
+
+ /// SpillSlotToUsesMap - Records uses for each register spill slot.
+ SmallVector<SmallPtrSet<MachineInstr*, 4>, 8> SpillSlotToUsesMap;
+
VirtRegMap(const VirtRegMap&); // DO NOT IMPLEMENT
void operator=(const VirtRegMap&); // DO NOT IMPLEMENT
@@ -299,6 +306,25 @@
RestorePt2VirtMap.erase(I);
}
+ /// @brief Return lowest spill slot index.
+ int getLowSpillSlot() const {
+ return LowSpillSlot;
+ }
+
+ /// @brief Return highest spill slot index.
+ int getHighSpillSlot() const {
+ return HighSpillSlot;
+ }
+
+ /// @brief Records a spill slot use.
+ void addSpillSlotUse(int FrameIndex, MachineInstr *MI);
+
+ /// @brief Returns true if spill slot has been used.
+ bool isSpillSlotUsed(int FrameIndex) const {
+ assert(FrameIndex >= 0 && "Spill slot index should not be negative!");
+ return !SpillSlotToUsesMap[FrameIndex-LowSpillSlot].empty();
+ }
+
/// @brief Updates information about the specified virtual register's value
/// folded into newMI machine instruction.
void virtFolded(unsigned VirtReg, MachineInstr *OldMI, MachineInstr *NewMI,
@@ -317,11 +343,7 @@
/// RemoveMachineInstrFromMaps - MI is being erased, remove it from the
/// the folded instruction map and spill point map.
- void RemoveMachineInstrFromMaps(MachineInstr *MI) {
- MI2VirtMap.erase(MI);
- SpillPt2VirtMap.erase(MI);
- RestorePt2VirtMap.erase(MI);
- }
+ void RemoveMachineInstrFromMaps(MachineInstr *MI);
void print(std::ostream &OS) const;
void print(std::ostream *OS) const { if (OS) print(*OS); }