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Change:
[oota-llvm.git]
/
lib
/
CodeGen
/
UnreachableBlockElim.cpp
diff --git
a/lib/CodeGen/UnreachableBlockElim.cpp
b/lib/CodeGen/UnreachableBlockElim.cpp
index be1fd23e2fccdf6904b6256fb2737b6f0e6b1d35..52693f03e82822e6bb9e87b98ef324b3c717ed78 100644
(file)
--- a/
lib/CodeGen/UnreachableBlockElim.cpp
+++ b/
lib/CodeGen/UnreachableBlockElim.cpp
@@
-26,6
+26,7
@@
#include "llvm/Function.h"
#include "llvm/Pass.h"
#include "llvm/Type.h"
#include "llvm/Function.h"
#include "llvm/Pass.h"
#include "llvm/Type.h"
+#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/ProfileInfo.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/Analysis/ProfileInfo.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
@@
-43,16
+44,19
@@
namespace {
virtual bool runOnFunction(Function &F);
public:
static char ID; // Pass identification, replacement for typeid
virtual bool runOnFunction(Function &F);
public:
static char ID; // Pass identification, replacement for typeid
- UnreachableBlockElim() : FunctionPass(&ID) {}
+ UnreachableBlockElim() : FunctionPass(ID) {
+ initializeUnreachableBlockElimPass(*PassRegistry::getPassRegistry());
+ }
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addPreserved<DominatorTree>();
AU.addPreserved<ProfileInfo>();
}
};
}
char UnreachableBlockElim::ID = 0;
INITIALIZE_PASS(UnreachableBlockElim, "unreachableblockelim",
AU.addPreserved<ProfileInfo>();
}
};
}
char UnreachableBlockElim::ID = 0;
INITIALIZE_PASS(UnreachableBlockElim, "unreachableblockelim",
- "Remove unreachable blocks from the CFG", false, false)
;
+ "Remove unreachable blocks from the CFG", false, false)
FunctionPass *llvm::createUnreachableBlockEliminationPass() {
return new UnreachableBlockElim();
FunctionPass *llvm::createUnreachableBlockEliminationPass() {
return new UnreachableBlockElim();
@@
-100,16
+104,15
@@
namespace {
MachineModuleInfo *MMI;
public:
static char ID; // Pass identification, replacement for typeid
MachineModuleInfo *MMI;
public:
static char ID; // Pass identification, replacement for typeid
- UnreachableMachineBlockElim() : MachineFunctionPass(
&
ID) {}
+ UnreachableMachineBlockElim() : MachineFunctionPass(ID) {}
};
}
char UnreachableMachineBlockElim::ID = 0;
};
}
char UnreachableMachineBlockElim::ID = 0;
-static RegisterPass<UnreachableMachineBlockElim>
-Y("unreachable-mbb-elimination",
- "Remove unreachable machine basic blocks");
+INITIALIZE_PASS(UnreachableMachineBlockElim, "unreachable-mbb-elimination",
+ "Remove unreachable machine basic blocks", false, false)
-c
onst PassInfo *const llvm::UnreachableMachineBlockElimID = &Y
;
+c
har &llvm::UnreachableMachineBlockElimID = UnreachableMachineBlockElim::ID
;
void UnreachableMachineBlockElim::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addPreserved<MachineLoopInfo>();
void UnreachableMachineBlockElim::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addPreserved<MachineLoopInfo>();
@@
-119,6
+122,7
@@
void UnreachableMachineBlockElim::getAnalysisUsage(AnalysisUsage &AU) const {
bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
SmallPtrSet<MachineBasicBlock*, 8> Reachable;
bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
SmallPtrSet<MachineBasicBlock*, 8> Reachable;
+ bool ModifiedPHI = false;
MMI = getAnalysisIfAvailable<MachineModuleInfo>();
MachineDominatorTree *MDT = getAnalysisIfAvailable<MachineDominatorTree>();
MMI = getAnalysisIfAvailable<MachineModuleInfo>();
MachineDominatorTree *MDT = getAnalysisIfAvailable<MachineDominatorTree>();
@@
-180,6
+184,7
@@
bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
if (!preds.count(phi->getOperand(i).getMBB())) {
phi->RemoveOperand(i);
phi->RemoveOperand(i-1);
if (!preds.count(phi->getOperand(i).getMBB())) {
phi->RemoveOperand(i);
phi->RemoveOperand(i-1);
+ ModifiedPHI = true;
}
if (phi->getNumOperands() == 3) {
}
if (phi->getNumOperands() == 3) {
@@
-189,9
+194,13
@@
bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
MachineInstr* temp = phi;
++phi;
temp->eraseFromParent();
MachineInstr* temp = phi;
++phi;
temp->eraseFromParent();
+ ModifiedPHI = true;
- if (Input != Output)
- F.getRegInfo().replaceRegWith(Output, Input);
+ if (Input != Output) {
+ MachineRegisterInfo &MRI = F.getRegInfo();
+ MRI.constrainRegClass(Input, MRI.getRegClass(Output));
+ MRI.replaceRegWith(Output, Input);
+ }
continue;
}
continue;
}
@@
-202,5
+211,5
@@
bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
F.RenumberBlocks();
F.RenumberBlocks();
- return
DeadBlocks.size(
);
+ return
(DeadBlocks.size() || ModifiedPHI
);
}
}