diff options
Diffstat (limited to 'lib/Target/PowerPC/PPCInstrInfo.cpp')
| -rw-r--r-- | lib/Target/PowerPC/PPCInstrInfo.cpp | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/PPCInstrInfo.cpp b/lib/Target/PowerPC/PPCInstrInfo.cpp index d652282..8b868e6 100644 --- a/lib/Target/PowerPC/PPCInstrInfo.cpp +++ b/lib/Target/PowerPC/PPCInstrInfo.cpp @@ -40,6 +40,10 @@ extern cl::opt<bool> DisablePPC64RS; using namespace llvm; +static cl:: +opt<bool> EnableCTRLoopAnal("enable-ppc-ctrloop-analysis", cl::Hidden, + cl::desc("Enable analysis for CTR loops (experimental)")); + PPCInstrInfo::PPCInstrInfo(PPCTargetMachine &tm) : PPCGenInstrInfo(PPC::ADJCALLSTACKDOWN, PPC::ADJCALLSTACKUP), TM(tm), RI(*TM.getSubtargetImpl(), *this) {} @@ -229,6 +233,8 @@ bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB, LastInst->getOpcode() == PPC::BDNZ) { if (!LastInst->getOperand(0).isMBB()) return true; + if (!EnableCTRLoopAnal) + return true; TBB = LastInst->getOperand(0).getMBB(); Cond.push_back(MachineOperand::CreateImm(1)); Cond.push_back(MachineOperand::CreateReg(isPPC64 ? PPC::CTR8 : PPC::CTR, @@ -238,6 +244,8 @@ bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB, LastInst->getOpcode() == PPC::BDZ) { if (!LastInst->getOperand(0).isMBB()) return true; + if (!EnableCTRLoopAnal) + return true; TBB = LastInst->getOperand(0).getMBB(); Cond.push_back(MachineOperand::CreateImm(0)); Cond.push_back(MachineOperand::CreateReg(isPPC64 ? PPC::CTR8 : PPC::CTR, @@ -274,6 +282,8 @@ bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB, if (!SecondLastInst->getOperand(0).isMBB() || !LastInst->getOperand(0).isMBB()) return true; + if (!EnableCTRLoopAnal) + return true; TBB = SecondLastInst->getOperand(0).getMBB(); Cond.push_back(MachineOperand::CreateImm(1)); Cond.push_back(MachineOperand::CreateReg(isPPC64 ? PPC::CTR8 : PPC::CTR, @@ -286,6 +296,8 @@ bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB, if (!SecondLastInst->getOperand(0).isMBB() || !LastInst->getOperand(0).isMBB()) return true; + if (!EnableCTRLoopAnal) + return true; TBB = SecondLastInst->getOperand(0).getMBB(); Cond.push_back(MachineOperand::CreateImm(0)); Cond.push_back(MachineOperand::CreateReg(isPPC64 ? PPC::CTR8 : PPC::CTR, |