From 09fdc7baae1b6905fe18df48e2278e74d4e39ccd Mon Sep 17 00:00:00 2001 From: Hal Finkel Date: Fri, 8 Jun 2012 15:38:25 +0000 Subject: Disable the PPC CTR-Loops pass by default. The pass itself works well, but the something in the Machine* infrastructure does not understand terminators which define registers. Without the ability to use the block-placement pass, etc. this causes performance regressions (and so is turned off by default). Turning off the analysis turns off the problems with the Machine* infrastructure. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158206 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/PowerPC/PPCInstrInfo.cpp | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'lib/Target/PowerPC/PPCInstrInfo.cpp') diff --git a/lib/Target/PowerPC/PPCInstrInfo.cpp b/lib/Target/PowerPC/PPCInstrInfo.cpp index d652282243..8b868e69ec 100644 --- a/lib/Target/PowerPC/PPCInstrInfo.cpp +++ b/lib/Target/PowerPC/PPCInstrInfo.cpp @@ -40,6 +40,10 @@ extern cl::opt DisablePPC64RS; using namespace llvm; +static cl:: +opt 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, -- cgit v1.2.3-70-g09d2