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Reapply r55191 and r55192.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55205 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2008-08-22 21:28:19 +00:00
parent 70f24c62ad
commit 3c8f36fd03
3 changed files with 18 additions and 9 deletions
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23
lib/CodeGen/SelectionDAG/FastISel.cpp
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@ -145,6 +145,8 @@ BasicBlock::iterator
FastISel::SelectInstructions(BasicBlock::iterator Begin,
BasicBlock::iterator End,
DenseMap<const Value*, unsigned> &ValueMap,
std::map<const BasicBlock*,
MachineBasicBlock *> &MBBMap,
MachineBasicBlock *mbb) {
MBB = mbb;
BasicBlock::iterator I = Begin;
@ -195,19 +197,24 @@ FastISel::SelectInstructions(BasicBlock::iterator Begin,
case Instruction::Br: {
BranchInst *BI = cast<BranchInst>(I);
// For now, check for and handle just the most trivial case: an
// unconditional fall-through branch.
if (BI->isUnconditional()) {
MachineFunction::iterator NextMBB =
MachineFunction::iterator NextMBB =
next(MachineFunction::iterator(MBB));
if (NextMBB != MF.end() &&
NextMBB->getBasicBlock() == BI->getSuccessor(0)) {
MBB->addSuccessor(NextMBB);
break;
BasicBlock *LLVMSucc = BI->getSuccessor(0);
MachineBasicBlock *MSucc = MBBMap[LLVMSucc];
if (NextMBB != MF.end() && MSucc == NextMBB) {
// The unconditional fall-through case, which needs no instructions.
} else {
// The unconditional branch case.
TII.InsertBranch(*MBB, MSucc, NULL, SmallVector<MachineOperand, 0>());
}
MBB->addSuccessor(MSucc);
break;
}
// Something more complicated. Halt "fast" selection and bail.
// Conditional branches are not handed yet.
// Halt "fast" selection and bail.
return I;
}