diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/FastISel.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/FastISel.cpp | 23 |
1 files changed, 8 insertions, 15 deletions
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp index fb4de574a8..1462472ea4 100644 --- a/lib/CodeGen/SelectionDAG/FastISel.cpp +++ b/lib/CodeGen/SelectionDAG/FastISel.cpp @@ -145,8 +145,6 @@ 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; @@ -197,24 +195,19 @@ 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)); - 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>()); + if (NextMBB != MF.end() && + NextMBB->getBasicBlock() == BI->getSuccessor(0)) { + MBB->addSuccessor(NextMBB); + break; } - MBB->addSuccessor(MSucc); - break; } - // Conditional branches are not handed yet. - // Halt "fast" selection and bail. + // Something more complicated. Halt "fast" selection and bail. return I; } |