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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160668 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2012-07-24 10:51:42 +00:00
parent 8899d5c6fb
commit a94d6e87c4
22 changed files with 500 additions and 498 deletions
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27
lib/Transforms/Scalar/Reg2Mem.cpp
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@@ -59,7 +59,7 @@ namespace {
virtual bool runOnFunction(Function &F);
};
}
char RegToMem::ID = 0;
INITIALIZE_PASS_BEGIN(RegToMem, "reg2mem", "Demote all values to stack slots",
false, false)
@@ -68,25 +68,25 @@ INITIALIZE_PASS_END(RegToMem, "reg2mem", "Demote all values to stack slots",
false, false)
bool RegToMem::runOnFunction(Function &F) {
if (F.isDeclaration())
if (F.isDeclaration())
return false;
// Insert all new allocas into entry block.
BasicBlock *BBEntry = &F.getEntryBlock();
assert(pred_begin(BBEntry) == pred_end(BBEntry) &&
"Entry block to function must not have predecessors!");
// Find first non-alloca instruction and create insertion point. This is
// safe if block is well-formed: it always have terminator, otherwise
// we'll get and assertion.
BasicBlock::iterator I = BBEntry->begin();
while (isa<AllocaInst>(I)) ++I;
CastInst *AllocaInsertionPoint =
new BitCastInst(Constant::getNullValue(Type::getInt32Ty(F.getContext())),
Type::getInt32Ty(F.getContext()),
"reg2mem alloca point", I);
// Find the escaped instructions. But don't create stack slots for
// allocas in entry block.
std::list<Instruction*> WorkList;
@@ -99,15 +99,15 @@ bool RegToMem::runOnFunction(Function &F) {
WorkList.push_front(&*iib);
}
}
// Demote escaped instructions
NumRegsDemoted += WorkList.size();
for (std::list<Instruction*>::iterator ilb = WorkList.begin(),
for (std::list<Instruction*>::iterator ilb = WorkList.begin(),
ile = WorkList.end(); ilb != ile; ++ilb)
DemoteRegToStack(**ilb, false, AllocaInsertionPoint);
WorkList.clear();
// Find all phi's
for (Function::iterator ibb = F.begin(), ibe = F.end();
ibb != ibe; ++ibb)
@@ -115,19 +115,18 @@ bool RegToMem::runOnFunction(Function &F) {
iib != iie; ++iib)
if (isa<PHINode>(iib))
WorkList.push_front(&*iib);
// Demote phi nodes
NumPhisDemoted += WorkList.size();
for (std::list<Instruction*>::iterator ilb = WorkList.begin(),
for (std::list<Instruction*>::iterator ilb = WorkList.begin(),
ile = WorkList.end(); ilb != ile; ++ilb)
DemotePHIToStack(cast<PHINode>(*ilb), AllocaInsertionPoint);
return true;
}
// createDemoteRegisterToMemory - Provide an entry point to create this pass.
//
char &llvm::DemoteRegisterToMemoryID = RegToMem::ID;
FunctionPass *llvm::createDemoteRegisterToMemoryPass() {
return new RegToMem();