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Minor cleanups, no functional changes

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Rename Function::getEntryNode -> getEntryBlock

llvm-svn: 8623
This commit is contained in:
Chris Lattner 2003-09-20 14:36:23 +00:00
parent b64863a2f3
commit fabd2617fc
1 changed files with 67 additions and 86 deletions
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153
lib/Transforms/Utils/DemoteRegToStack.cpp
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@ -1,4 +1,4 @@
//===- DemoteRegToStack.cpp - Move a virtual reg. to stack ------*- C++ -*-===//
//===- DemoteRegToStack.cpp - Move a virtual reg. to stack ----------------===//
//
// This file provide the function DemoteRegToStack(). This function takes a
// virtual register computed by an Instruction& X and replaces it with a slot in
@ -16,11 +16,6 @@
#include "Support/hash_set"
#include <stack>
//----------------------------------------------------------------------------
// function DemoteRegToStack()
//
//----------------------------------------------------------------------------
typedef hash_set<PHINode*> PhiSet;
typedef hash_set<PHINode*>::iterator PhiSetIterator;
@ -36,41 +31,37 @@ inline void PushOperandsOnWorkList(std::stack<Instruction*>& workList,
workList.push(opI);
}
void FindPhis(Instruction& X, PhiSet& phisToGo)
{
static void FindPhis(Instruction& X, PhiSet& phisToGo) {
std::stack<Instruction*> workList;
workList.push(&X);
// Handle the case that X itself is a Phi!
if (PHINode* phiX = dyn_cast<PHINode>(&X))
{
phisToGo.insert(phiX);
PushOperandsOnWorkList(workList, phisToGo, phiX);
}
if (PHINode* phiX = dyn_cast<PHINode>(&X)) {
phisToGo.insert(phiX);
PushOperandsOnWorkList(workList, phisToGo, phiX);
}
// Now use a worklist to find all phis reachable from X, and
// (recursively) all phis reachable from operands of such phis.
for (Instruction* workI; !workList.empty(); workList.pop())
{
workI = workList.top();
for (Value::use_iterator UI=workI->use_begin(), UE=workI->use_end();
UI != UE; ++UI)
if (PHINode* phiN = dyn_cast<PHINode>(*UI))
if (phisToGo.find(phiN) == phisToGo.end())
{ // Seeing this phi for the first time: it must go!
phisToGo.insert(phiN);
workList.push(phiN);
PushOperandsOnWorkList(workList, phisToGo, phiN);
}
}
for (Instruction* workI; !workList.empty(); workList.pop()) {
workI = workList.top();
for (Value::use_iterator UI=workI->use_begin(), UE=workI->use_end();
UI != UE; ++UI)
if (PHINode* phiN = dyn_cast<PHINode>(*UI))
if (phisToGo.find(phiN) == phisToGo.end()) {
// Seeing this phi for the first time: it must go!
phisToGo.insert(phiN);
workList.push(phiN);
PushOperandsOnWorkList(workList, phisToGo, phiN);
}
}
}
// Create the Alloca for X
AllocaInst* CreateAllocaForX(Instruction& X)
{
static AllocaInst* CreateAllocaForX(Instruction& X) {
Function* parentFunc = X.getParent()->getParent();
Instruction* entryInst = parentFunc->getEntryNode().begin();
Instruction* entryInst = parentFunc->getEntryBlock().begin();
return new AllocaInst(X.getType(), /*arraySize*/ NULL,
X.hasName()? X.getName()+std::string("OnStack")
: "DemotedTmp",
@ -79,72 +70,63 @@ AllocaInst* CreateAllocaForX(Instruction& X)
// Insert loads before all uses of I, except uses in Phis
// since all such Phis *must* be deleted.
void LoadBeforeUses(Instruction* def, AllocaInst* XSlot)
{
for (unsigned nPhis = 0; def->use_size() - nPhis > 0; )
{
static void LoadBeforeUses(Instruction* def, AllocaInst* XSlot) {
for (unsigned nPhis = 0; def->use_size() - nPhis > 0; ) {
Instruction* useI = cast<Instruction>(def->use_back());
if (!isa<PHINode>(useI))
{
LoadInst* loadI =
new LoadInst(XSlot, std::string("Load")+XSlot->getName(), useI);
useI->replaceUsesOfWith(def, loadI);
}
else
if (!isa<PHINode>(useI)) {
LoadInst* loadI =
new LoadInst(XSlot, std::string("Load")+XSlot->getName(), useI);
useI->replaceUsesOfWith(def, loadI);
} else
++nPhis;
}
}
}
void AddLoadsAndStores(AllocaInst* XSlot, Instruction& X, PhiSet& phisToGo)
{
for (PhiSetIterator PI=phisToGo.begin(), PE=phisToGo.end(); PI != PE; ++PI)
{
PHINode* pn = *PI;
static void AddLoadsAndStores(AllocaInst* XSlot, Instruction& X,
PhiSet& phisToGo) {
for (PhiSetIterator PI=phisToGo.begin(), PE=phisToGo.end(); PI != PE; ++PI) {
PHINode* pn = *PI;
// First, insert loads before all uses except uses in Phis.
// Do this first because new stores will appear as uses also!
LoadBeforeUses(pn, XSlot);
// First, insert loads before all uses except uses in Phis.
// Do this first because new stores will appear as uses also!
LoadBeforeUses(pn, XSlot);
// For every incoming operand of the Phi, insert a store either
// just after the instruction defining the value or just before the
// predecessor of the Phi if the value is a formal, not an instruction.
//
for (unsigned i=0, N=pn->getNumIncomingValues(); i < N; ++i)
{
Value* phiOp = pn->getIncomingValue(i);
if (phiOp != &X &&
(!isa<PHINode>(phiOp) ||
phisToGo.find(cast<PHINode>(phiOp)) == phisToGo.end()))
{ // This operand is not a phi that will be deleted: need to store.
assert(!isa<TerminatorInst>(phiOp));
// For every incoming operand of the Phi, insert a store either
// just after the instruction defining the value or just before the
// predecessor of the Phi if the value is a formal, not an instruction.
//
for (unsigned i=0, N=pn->getNumIncomingValues(); i < N; ++i) {
Value* phiOp = pn->getIncomingValue(i);
if (phiOp != &X &&
(!isa<PHINode>(phiOp) ||
phisToGo.find(cast<PHINode>(phiOp)) == phisToGo.end())) {
// This operand is not a phi that will be deleted: need to store.
assert(!isa<TerminatorInst>(phiOp));
Instruction* storeBefore;
if (Instruction* I = dyn_cast<Instruction>(phiOp))
{ // phiOp is an instruction, store its result right after it.
assert(I->getNext() && "Non-terminator without successor?");
storeBefore = I->getNext();
}
else
{ // If not, it must be a formal: store it at the end of the
// predecessor block of the Phi (*not* at function entry!).
storeBefore = pn->getIncomingBlock(i)->getTerminator();
}
// Create instr. to store the value of phiOp before `insertBefore'
StoreInst* storeI = new StoreInst(phiOp, XSlot, storeBefore);
}
Instruction* storeBefore;
if (Instruction* I = dyn_cast<Instruction>(phiOp)) {
// phiOp is an instruction, store its result right after it.
assert(I->getNext() && "Non-terminator without successor?");
storeBefore = I->getNext();
} else {
// If not, it must be a formal: store it at the end of the
// predecessor block of the Phi (*not* at function entry!).
storeBefore = pn->getIncomingBlock(i)->getTerminator();
}
// Create instr. to store the value of phiOp before `insertBefore'
StoreInst* storeI = new StoreInst(phiOp, XSlot, storeBefore);
}
}
}
}
void DeletePhis(PhiSet& phisToGo)
{
for (PhiSetIterator PI=phisToGo.begin(), PE=phisToGo.end(); PI != PE; ++PI)
{
assert((*PI)->use_size() == 0 && "This PHI should be DEAD!");
(*PI)->getParent()->getInstList().remove(*PI);
delete *PI;
}
static void DeletePhis(PhiSet& phisToGo) {
for (PhiSetIterator PI=phisToGo.begin(), PE=phisToGo.end(); PI != PE; ++PI) {
assert((*PI)->use_size() == 0 && "This PHI should be DEAD!");
(*PI)->getParent()->getInstList().remove(*PI);
delete *PI;
}
phisToGo.clear();
}
@ -164,8 +146,7 @@ void DeletePhis(PhiSet& phisToGo)
// Returns the pointer to the alloca inserted to create a stack slot for X.
//----------------------------------------------------------------------------
AllocaInst* DemoteRegToStack(Instruction& X)
{
AllocaInst* DemoteRegToStack(Instruction& X) {
if (X.getType() == Type::VoidTy)
return NULL; // nothing to do!