1 //===-- SILateBranchLowering.cpp - Final preparation of branches ----------===//
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
12 //===----------------------------------------------------------------------===//
23 #define DEBUG_TYPE "si-late-branch-lowering"
47     return "SI Final Branch Preparation";  in getPassName()
62                       "SI insert s_cbranch_execz instructions", false, false)
65                     "SI insert s_cbranch_execz instructions", false, false)
81   bool MustExport = !AMDGPU::isGFX10Plus(TII->getSubtarget());  in generateEndPgm()
85     const GCNSubtarget &ST = MBB.getParent()->getSubtarget<GCNSubtarget>();  in generateEndPgm()
90     BuildMI(MBB, I, DL, TII->get(AMDGPU::EXP_DONE))  in generateEndPgm()
98         .addImm(0); // en  in generateEndPgm()
102   BuildMI(MBB, I, DL, TII->get(AMDGPU::S_ENDPGM)).addImm(0);  in generateEndPgm()
112   for (MachineBasicBlock *Succ : SplitBB->successors()) {  in splitBlock()
117   MDT->getBase().applyUpdates(DTUpdates);  in splitBlock()
125   BuildMI(*MI.getParent(), MI, MI.getDebugLoc(), TII->get(MovOpc), ExecReg)  in expandChainCall()
126       ->addOperand(MI.getOperand(ExecIdx));  in expandChainCall()
129   MI.setDesc(TII->get(AMDGPU::SI_TCRETURN));  in expandChainCall()
137   auto BranchMI = BuildMI(MBB, MI, DL, TII->get(AMDGPU::S_CBRANCH_SCC0))  in earlyTerm()
141   if (Next != MBB.end() && !Next->isTerminator())  in earlyTerm()
145   MDT->getBase().insertEdge(&MBB, EarlyExitBlock);  in earlyTerm()
151   TRI = &TII->getRegisterInfo();  in runOnMachineFunction()
166         // This only occurs in -O0 when BranchFolding is not executed.  in runOnMachineFunction()
200     BuildMI(*EarlyExitBlock, EarlyExitBlock->end(), DL, TII->get(MovOpc),  in runOnMachineFunction()
203     generateEndPgm(*EarlyExitBlock, EarlyExitBlock->end(), DL, TII, MF);  in runOnMachineFunction()
209       Instr->eraseFromParent();  in runOnMachineFunction()
219     assert(!MF.getInfo<SIMachineFunctionInfo>()->returnsVoid());  in runOnMachineFunction()
229       auto MBB = MI->getParent();  in runOnMachineFunction()
230       if (MBB == &MF.back() && MI == &MBB->back())  in runOnMachineFunction()
240       MBB->addSuccessor(EmptyMBBAtEnd);  in runOnMachineFunction()
241       MDT->getBase().insertEdge(MBB, EmptyMBBAtEnd);  in runOnMachineFunction()
242       BuildMI(*MBB, MI, MI->getDebugLoc(), TII->get(AMDGPU::S_BRANCH))  in runOnMachineFunction()
244       MI->eraseFromParent();  in runOnMachineFunction()