Revert r141365. It was causing MultiSource/Benchmarks/MiBench/consumer-lame to

hang, and possibly SPEC/CINT2006/464_h264ref.

llvm-svn: 141560

1 files changed, 0 insertions, 80 deletions

diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp
index 0313f99908c..a50bf09b3d9 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -6181,86 +6181,6 @@ ARMTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
     MI->eraseFromParent();   // The pseudo instruction is gone now.
     return BB;
   }
-
-  case ARM::ABS:
-  case ARM::t2ABS: {
-    // To insert an ABS instruction, we have to insert the
-    // diamond control-flow pattern.  The incoming instruction knows the
-    // source vreg to test against 0, the destination vreg to set,
-    // the condition code register to branch on, the
-    // true/false values to select between, and a branch opcode to use. 
-    // It transforms
-    //     V1 = ABS V0
-    // into
-    //     V2 = MOVS V0
-    //     BCC                      (branch to SinkBB if V0 >= 0)
-    //     RSBBB: V3 = RSBri V2, 0  (compute ABS if V2 < 0)
-    //     SinkBB: V1 = PHI(V2, V3)     
-    const BasicBlock *LLVM_BB = BB->getBasicBlock();
-    MachineFunction::iterator BBI = BB;
-    ++BBI;
-    MachineFunction *Fn = BB->getParent();
-    MachineBasicBlock *RSBBB = Fn->CreateMachineBasicBlock(LLVM_BB);
-    MachineBasicBlock *SinkBB  = Fn->CreateMachineBasicBlock(LLVM_BB);
-    Fn->insert(BBI, RSBBB);
-    Fn->insert(BBI, SinkBB);
-
-    unsigned int ABSSrcReg = MI->getOperand(1).getReg();
-    unsigned int ABSDstReg = MI->getOperand(0).getReg();
-    bool isThumb2 = Subtarget->isThumb2();
-    MachineRegisterInfo &MRI = Fn->getRegInfo();
-    // In Thumb mode S must not be specified if source register is the SP or
-    // PC and if destination register is the SP, so restrict register class
-    unsigned NewMovDstReg = MRI.createVirtualRegister(
-      isThumb2 ? ARM::rGPRRegisterClass : ARM::GPRRegisterClass);
-    unsigned NewRsbDstReg = MRI.createVirtualRegister(
-      isThumb2 ? ARM::rGPRRegisterClass : ARM::GPRRegisterClass);
-
-    // Transfer the remainder of BB and its successor edges to sinkMBB.
-    SinkBB->splice(SinkBB->begin(), BB,
-      llvm::next(MachineBasicBlock::iterator(MI)),
-      BB->end());
-    SinkBB->transferSuccessorsAndUpdatePHIs(BB);
-
-    BB->addSuccessor(RSBBB);
-    BB->addSuccessor(SinkBB);
-
-    // fall through to SinkMBB
-    RSBBB->addSuccessor(SinkBB);
-
-    // insert a movs at the end of BB
-    BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2MOVr : ARM::MOVr),
-      NewMovDstReg)
-      .addReg(ABSSrcReg, RegState::Kill)
-      .addImm((unsigned)ARMCC::AL).addReg(0)
-      .addReg(ARM::CPSR, RegState::Define);
-
-    // insert a bcc with opposite CC to ARMCC::MI at the end of BB
-    BuildMI(BB, dl, 
-      TII->get(isThumb2 ? ARM::t2Bcc : ARM::Bcc)).addMBB(SinkBB)
-      .addImm(ARMCC::getOppositeCondition(ARMCC::MI)).addReg(ARM::CPSR);
-
-    // insert rsbri in RSBBB
-    // Note: BCC and rsbri will be converted into predicated rsbmi
-    // by if-conversion pass
-    BuildMI(*RSBBB, RSBBB->begin(), dl, 
-      TII->get(isThumb2 ? ARM::t2RSBri : ARM::RSBri), NewRsbDstReg)
-      .addReg(NewMovDstReg, RegState::Kill)
-      .addImm(0).addImm((unsigned)ARMCC::AL).addReg(0).addReg(0);
-
-    // insert PHI in SinkBB, 
-    // reuse ABSDstReg to not change uses of ABS instruction
-    BuildMI(*SinkBB, SinkBB->begin(), dl,
-      TII->get(ARM::PHI), ABSDstReg)
-      .addReg(NewRsbDstReg).addMBB(RSBBB)
-      .addReg(NewMovDstReg).addMBB(BB);
-
-    // remove ABS instruction
-    MI->eraseFromParent(); 
-
-    // return last added BB
-    return SinkBB;
-  }
   }
 }