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Fix a FastISel bug where the instructions from lowering the arguments 

were being emitted after the first instructions of the entry block.

llvm-svn: 55496
This commit is contained in:
Dan Gohman 2008-08-28 20:28:56 +00:00
parent 0ac012835f
commit 360c57f683
2 changed files with 17 additions and 14 deletions
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3
llvm/include/llvm/CodeGen/SelectionDAGISel.h
View File

@ -110,8 +110,7 @@ private:
void SelectBasicBlock(BasicBlock *LLVMBB,
BasicBlock::iterator Begin,
BasicBlock::iterator End,
bool DoArgs);
BasicBlock::iterator End);
void CodeGenAndEmitDAG();
void LowerArguments(BasicBlock *BB);

28
llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -5479,12 +5479,7 @@ SelectionDAGISel::HandlePHINodesInSuccessorBlocks(BasicBlock *LLVMBB) {
void SelectionDAGISel::SelectBasicBlock(BasicBlock *LLVMBB,
BasicBlock::iterator Begin,
BasicBlock::iterator End,
bool DoArgs) {
// Lower any arguments needed in this block if this is the entry block.
if (DoArgs)
LowerArguments(LLVMBB);
BasicBlock::iterator End) {
SDL->setCurrentBasicBlock(BB);
MachineModuleInfo *MMI = CurDAG->getMachineModuleInfo();
@ -5744,12 +5739,23 @@ void SelectionDAGISel::SelectAllBasicBlocks(Function &Fn, MachineFunction &MF) {
BasicBlock::iterator Begin = LLVMBB->begin();
BasicBlock::iterator End = LLVMBB->end();
bool DoArgs = LLVMBB == &Fn.getEntryBlock();
// Lower any arguments needed in this block if this is the entry block.
if (LLVMBB == &Fn.getEntryBlock())
LowerArguments(LLVMBB);
// Before doing SelectionDAG ISel, see if FastISel has been requested.
// FastISel doesn't support EH landing pads, which require special handling.
if (EnableFastISel && !BB->isLandingPad()) {
if (FastISel *F = TLI.createFastISel(*FuncInfo->MF)) {
// Emit code for any incoming arguments. This must happen before
// beginning FastISel on the entry block.
if (LLVMBB == &Fn.getEntryBlock()) {
CurDAG->setRoot(SDL->getControlRoot());
CodeGenAndEmitDAG();
SDL->clear();
}
// Do FastISel on as many instructions as possible.
while (Begin != End) {
Begin = F->SelectInstructions(Begin, End, FuncInfo->ValueMap,
FuncInfo->MBBMap, BB);
@ -5767,10 +5773,8 @@ void SelectionDAGISel::SelectAllBasicBlocks(Function &Fn, MachineFunction &MF) {
R = FuncInfo->CreateRegForValue(Begin);
}
SelectBasicBlock(LLVMBB, Begin, next(Begin), DoArgs);
SelectBasicBlock(LLVMBB, Begin, next(Begin));
++Begin;
DoArgs = false;
continue;
}
@ -5792,8 +5796,8 @@ void SelectionDAGISel::SelectAllBasicBlocks(Function &Fn, MachineFunction &MF) {
}
}
if (Begin != End || DoArgs)
SelectBasicBlock(LLVMBB, Begin, End, DoArgs);
if (Begin != End)
SelectBasicBlock(LLVMBB, Begin, End);
FinishBasicBlock();
}