#define DEBUG_TYPE "machine-sink"
#include "llvm/CodeGen/Passes.h"
-#include "llvm/CodeGen/MachineRegisterInfo.h"
-#include "llvm/CodeGen/MachineDominators.h"
-#include "llvm/CodeGen/MachineLoopInfo.h"
-#include "llvm/Analysis/AliasAnalysis.h"
-#include "llvm/Target/TargetRegisterInfo.h"
-#include "llvm/Target/TargetInstrInfo.h"
-#include "llvm/Target/TargetMachine.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/Statistic.h"
+#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/CodeGen/MachineDominators.h"
+#include "llvm/CodeGen/MachineLoopInfo.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetRegisterInfo.h"
using namespace llvm;
static cl::opt<bool>
MachineDominatorTree *DT; // Machine dominator tree
MachineLoopInfo *LI;
AliasAnalysis *AA;
- BitVector AllocatableSet; // Which physregs are allocatable?
// Remember which edges have been considered for breaking.
SmallSet<std::pair<MachineBasicBlock*,MachineBasicBlock*>, 8>
bool PerformTrivialForwardCoalescing(MachineInstr *MI,
MachineBasicBlock *MBB);
};
+
+ // SuccessorSorter - Sort Successors according to their loop depth.
+ struct SuccessorSorter {
+ SuccessorSorter(MachineLoopInfo *LoopInfo) : LI(LoopInfo) {}
+ bool operator()(const MachineBasicBlock *LHS,
+ const MachineBasicBlock *RHS) const {
+ return LI->getLoopDepth(LHS) < LI->getLoopDepth(RHS);
+ }
+ MachineLoopInfo *LI;
+ };
} // end anonymous namespace
char MachineSinking::ID = 0;
DT = &getAnalysis<MachineDominatorTree>();
LI = &getAnalysis<MachineLoopInfo>();
AA = &getAnalysis<AliasAnalysis>();
- AllocatableSet = TRI->getAllocatableSet(MF);
bool EverMadeChange = false;
// Otherwise, we should look at all the successors and decide which one
// we should sink to.
- for (MachineBasicBlock::succ_iterator SI = MBB->succ_begin(),
- E = MBB->succ_end(); SI != E; ++SI) {
+ // We give successors with smaller loop depth higher priority.
+ SmallVector<MachineBasicBlock*, 4> Succs(MBB->succ_begin(), MBB->succ_end());
+ std::stable_sort(Succs.begin(), Succs.end(), SuccessorSorter(LI));
+ for (SmallVector<MachineBasicBlock*, 4>::iterator SI = Succs.begin(),
+ E = Succs.end(); SI != E; ++SI) {
MachineBasicBlock *SuccBlock = *SI;
bool LocalUse = false;
if (AllUsesDominatedByBlock(Reg, SuccBlock, MBB,