diff options
| -rw-r--r-- | lib/Target/PowerPC/PPCISelLowering.cpp | 44 |
1 files changed, 31 insertions, 13 deletions
diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp index 0b207f1216..8a1a1ffa5c 100644 --- a/lib/Target/PowerPC/PPCISelLowering.cpp +++ b/lib/Target/PowerPC/PPCISelLowering.cpp @@ -4040,38 +4040,56 @@ PPCTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI, unsigned oldval = MI->getOperand(3).getReg(); unsigned newval = MI->getOperand(4).getReg(); - MachineBasicBlock *loopMBB = F->CreateMachineBasicBlock(LLVM_BB); + MachineBasicBlock *loop1MBB = F->CreateMachineBasicBlock(LLVM_BB); + MachineBasicBlock *loop2MBB = F->CreateMachineBasicBlock(LLVM_BB); + MachineBasicBlock *midMBB = F->CreateMachineBasicBlock(LLVM_BB); MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB); - F->insert(It, loopMBB); + F->insert(It, loop1MBB); + F->insert(It, loop2MBB); + F->insert(It, midMBB); F->insert(It, exitMBB); exitMBB->transferSuccessors(BB); // thisMBB: // ... // fallthrough --> loopMBB - BB->addSuccessor(loopMBB); + BB->addSuccessor(loop1MBB); - // loopMBB: + // loop1MBB: // l[wd]arx dest, ptr - // cmp[wd] CR1, dest, oldval + // cmp[wd] dest, oldval + // bne- midMBB + // loop2MBB: // st[wd]cx. newval, ptr - // bne- CR1, exitMBB // bne- loopMBB - // fallthrough --> exitMBB - BB = loopMBB; + // b exitBB + // midMBB: + // st[wd]cx. dest, ptr + // exitBB: + BB = loop1MBB; BuildMI(BB, TII->get(is64bit ? PPC::LDARX : PPC::LWARX), dest) .addReg(ptrA).addReg(ptrB); - BuildMI(BB, TII->get(is64bit ? PPC::CMPD : PPC::CMPW), PPC::CR1) + BuildMI(BB, TII->get(is64bit ? PPC::CMPD : PPC::CMPW), PPC::CR0) .addReg(oldval).addReg(dest); + BuildMI(BB, TII->get(PPC::BCC)) + .addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(midMBB); + BB->addSuccessor(loop2MBB); + BB->addSuccessor(midMBB); + + BB = loop2MBB; BuildMI(BB, TII->get(is64bit ? PPC::STDCX : PPC::STWCX)) .addReg(newval).addReg(ptrA).addReg(ptrB); BuildMI(BB, TII->get(PPC::BCC)) - .addImm(PPC::PRED_NE).addReg(PPC::CR1).addMBB(exitMBB); - BuildMI(BB, TII->get(PPC::BCC)) - .addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(loopMBB); - BB->addSuccessor(loopMBB); + .addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(loop1MBB); + BuildMI(BB, TII->get(PPC::B)).addMBB(exitMBB); + BB->addSuccessor(loop1MBB); BB->addSuccessor(exitMBB); + BB = midMBB; + BuildMI(BB, TII->get(is64bit ? PPC::STDCX : PPC::STWCX)) + .addReg(dest).addReg(ptrA).addReg(ptrB); + BB->addSuccessor(exitMBB); + // exitMBB: // ... BB = exitMBB; |