64 lines · cpp
1//===- llvm/unittests/Target/AMDGPU/ExecMayBeModifiedBeforeAnyUse.cpp -----===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "AMDGPUTargetMachine.h"10#include "AMDGPUUnitTests.h"11#include "llvm/CodeGen/MachineModuleInfo.h"12#include "gtest/gtest.h"13 14using namespace llvm;15 16TEST(AMDGPU, ExecMayBeModifiedBeforeAnyUse) {17 auto TM = createAMDGPUTargetMachine("amdgcn-amd-", "gfx906", "");18 if (!TM)19 GTEST_SKIP();20 21 GCNSubtarget ST(TM->getTargetTriple(), std::string(TM->getTargetCPU()),22 std::string(TM->getTargetFeatureString()), *TM);23 24 LLVMContext Ctx;25 Module Mod("Module", Ctx);26 Mod.setDataLayout(TM->createDataLayout());27 28 auto *Type = FunctionType::get(Type::getVoidTy(Ctx), false);29 auto *F = Function::Create(Type, GlobalValue::ExternalLinkage, "Test", &Mod);30 31 MachineModuleInfo MMI(TM.get());32 auto MF =33 std::make_unique<MachineFunction>(*F, *TM, ST, MMI.getContext(), 42);34 auto *BB = MF->CreateMachineBasicBlock();35 MF->push_back(BB);36 37 auto E = BB->end();38 DebugLoc DL;39 const auto &TII = *ST.getInstrInfo();40 auto &MRI = MF->getRegInfo();41 42 // create machine IR43 Register R = MRI.createVirtualRegister(&AMDGPU::SReg_32RegClass);44 45 MachineInstr *DefMI =46 BuildMI(*BB, E, DL, TII.get(AMDGPU::S_MOV_B32), R).addImm(42).getInstr();47 48 auto First =49 BuildMI(*BB, E, DL, TII.get(AMDGPU::S_NOP)).addReg(R, RegState::Implicit);50 51 BuildMI(*BB, E, DL, TII.get(AMDGPU::S_NOP)).addReg(R, RegState::Implicit);52 53 // this violates the continuous sequence of R's uses for the first S_NOP54 First.addReg(R, RegState::Implicit);55 56#ifdef DEBUG_THIS_TEST57 MF->dump();58 MRI.dumpUses(R);59#endif60 61 // make sure execMayBeModifiedBeforeAnyUse doesn't crash62 ASSERT_FALSE(execMayBeModifiedBeforeAnyUse(MRI, R, *DefMI));63}64