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Reapply the removal of SelectionDAGISel's BB, with a fix for the case

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where multiple blocks are emitted; functions which do this need to return
the new BB so that their callers can stay current.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101843 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-04-20 00:29:35 +00:00
parent 02170c0034
commit a9a3321938
2 changed files with 28 additions and 24 deletions
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14
include/llvm/CodeGen/SelectionDAGISel.h
View File

@ -46,7 +46,6 @@ public:
MachineRegisterInfo *RegInfo;
SelectionDAG *CurDAG;
SelectionDAGBuilder *SDB;
MachineBasicBlock *BB;
AliasAnalysis *AA;
GCFunctionInfo *GFI;
CodeGenOpt::Level OptLevel;
@ -283,13 +282,14 @@ private:
void PrepareEHLandingPad(MachineBasicBlock *BB);
void SelectAllBasicBlocks(const Function &Fn);
void FinishBasicBlock();
void FinishBasicBlock(MachineBasicBlock *BB);
void SelectBasicBlock(const BasicBlock *LLVMBB,
BasicBlock::const_iterator Begin,
BasicBlock::const_iterator End,
bool &HadTailCall);
void CodeGenAndEmitDAG();
MachineBasicBlock *SelectBasicBlock(MachineBasicBlock *BB,
const BasicBlock *LLVMBB,
BasicBlock::const_iterator Begin,
BasicBlock::const_iterator End,
bool &HadTailCall);
MachineBasicBlock *CodeGenAndEmitDAG(MachineBasicBlock *BB);
void LowerArguments(const BasicBlock *BB);
void ShrinkDemandedOps();

38
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -249,10 +249,12 @@ static void ResetDebugLoc(SelectionDAGBuilder *SDB, FastISel *FastIS) {
FastIS->setCurDebugLoc(DebugLoc());
}
void SelectionDAGISel::SelectBasicBlock(const BasicBlock *LLVMBB,
BasicBlock::const_iterator Begin,
BasicBlock::const_iterator End,
bool &HadTailCall) {
MachineBasicBlock *
SelectionDAGISel::SelectBasicBlock(MachineBasicBlock *BB,
const BasicBlock *LLVMBB,
BasicBlock::const_iterator Begin,
BasicBlock::const_iterator End,
bool &HadTailCall) {
// Lower all of the non-terminator instructions. If a call is emitted
// as a tail call, cease emitting nodes for this block. Terminators
// are handled below.
@ -286,9 +288,10 @@ void SelectionDAGISel::SelectBasicBlock(const BasicBlock *LLVMBB,
CurDAG->setRoot(SDB->getControlRoot());
// Final step, emit the lowered DAG as machine code.
CodeGenAndEmitDAG();
BB = CodeGenAndEmitDAG(BB);
HadTailCall = SDB->HasTailCall;
SDB->clear();
return BB;
}
namespace {
@ -473,7 +476,7 @@ void SelectionDAGISel::ComputeLiveOutVRegInfo() {
} while (!Worklist.empty());
}
void SelectionDAGISel::CodeGenAndEmitDAG() {
MachineBasicBlock *SelectionDAGISel::CodeGenAndEmitDAG(MachineBasicBlock *BB) {
std::string GroupName;
if (TimePassesIsEnabled)
GroupName = "Instruction Selection and Scheduling";
@ -638,6 +641,7 @@ void SelectionDAGISel::CodeGenAndEmitDAG() {
DEBUG(dbgs() << "Selected machine code:\n");
DEBUG(BB->dump());
return BB;
}
void SelectionDAGISel::DoInstructionSelection() {
@ -754,7 +758,7 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
// Iterate over all basic blocks in the function.
for (Function::const_iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) {
const BasicBlock *LLVMBB = &*I;
BB = FuncInfo->MBBMap[LLVMBB];
MachineBasicBlock *BB = FuncInfo->MBBMap[LLVMBB];
BasicBlock::const_iterator const Begin = LLVMBB->begin();
BasicBlock::const_iterator const End = LLVMBB->end();
@ -790,7 +794,7 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
// beginning FastISel on the entry block.
if (LLVMBB == &Fn.getEntryBlock()) {
CurDAG->setRoot(SDB->getControlRoot());
CodeGenAndEmitDAG();
BB = CodeGenAndEmitDAG(BB);
SDB->clear();
}
FastIS->startNewBlock(BB);
@ -838,7 +842,7 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
}
bool HadTailCall = false;
SelectBasicBlock(LLVMBB, BI, llvm::next(BI), HadTailCall);
BB = SelectBasicBlock(BB, LLVMBB, BI, llvm::next(BI), HadTailCall);
// If the call was emitted as a tail call, we're done with the block.
if (HadTailCall) {
@ -874,17 +878,17 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
// block.
if (BI != End) {
bool HadTailCall;
SelectBasicBlock(LLVMBB, BI, End, HadTailCall);
BB = SelectBasicBlock(BB, LLVMBB, BI, End, HadTailCall);
}
FinishBasicBlock();
FinishBasicBlock(BB);
}
delete FastIS;
}
void
SelectionDAGISel::FinishBasicBlock() {
SelectionDAGISel::FinishBasicBlock(MachineBasicBlock *BB) {
DEBUG(dbgs() << "Target-post-processed machine code:\n");
DEBUG(BB->dump());
@ -923,7 +927,7 @@ SelectionDAGISel::FinishBasicBlock() {
// Emit the code
SDB->visitBitTestHeader(SDB->BitTestCases[i], BB);
CurDAG->setRoot(SDB->getRoot());
CodeGenAndEmitDAG();
BB = CodeGenAndEmitDAG(BB);
SDB->clear();
}
@ -944,7 +948,7 @@ SelectionDAGISel::FinishBasicBlock() {
CurDAG->setRoot(SDB->getRoot());
CodeGenAndEmitDAG();
BB = CodeGenAndEmitDAG(BB);
SDB->clear();
}
@ -991,7 +995,7 @@ SelectionDAGISel::FinishBasicBlock() {
SDB->visitJumpTableHeader(SDB->JTCases[i].second, SDB->JTCases[i].first,
BB);
CurDAG->setRoot(SDB->getRoot());
CodeGenAndEmitDAG();
BB = CodeGenAndEmitDAG(BB);
SDB->clear();
}
@ -1000,7 +1004,7 @@ SelectionDAGISel::FinishBasicBlock() {
// Emit the code
SDB->visitJumpTable(SDB->JTCases[i].second);
CurDAG->setRoot(SDB->getRoot());
CodeGenAndEmitDAG();
BB = CodeGenAndEmitDAG(BB);
SDB->clear();
// Update PHI Nodes
@ -1048,7 +1052,7 @@ SelectionDAGISel::FinishBasicBlock() {
// Emit the code
SDB->visitSwitchCase(SDB->SwitchCases[i], BB);
CurDAG->setRoot(SDB->getRoot());
CodeGenAndEmitDAG();
BB = CodeGenAndEmitDAG(BB);
// Handle any PHI nodes in successors of this chunk, as if we were coming
// from the original BB before switch expansion. Note that PHI nodes can