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-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "AMDGPUTargetMachine.h"
10 #include "GCNSubtarget.h"
11 #include "MCTargetDesc/AMDGPUMCTargetDesc.h"
12 #include "llvm/CodeGen/MachineModuleInfo.h"
13 #include "llvm/CodeGen/TargetSubtargetInfo.h"
14 #include "llvm/MC/MCTargetOptions.h"
15 #include "llvm/MC/TargetRegistry.h"
16 #include "llvm/Support/TargetSelect.h"
17 #include "llvm/Target/TargetMachine.h"
18 #include "gtest/gtest.h"
19 #include <thread>
20
21 using namespace llvm;
22
23 // implementation is in the llvm/unittests/Target/AMDGPU/DwarfRegMappings.cpp
24 std::unique_ptr<const GCNTargetMachine>
25 createTargetMachine(std::string TStr, StringRef CPU, StringRef FS);
26
TEST(AMDGPUExecMayBeModifiedBeforeAnyUse,TheTest)27 TEST(AMDGPUExecMayBeModifiedBeforeAnyUse, TheTest) {
28 auto TM = createTargetMachine("amdgcn-amd-", "gfx906", "");
29 if (!TM)
30 return;
31
32 GCNSubtarget ST(TM->getTargetTriple(), std::string(TM->getTargetCPU()),
33 std::string(TM->getTargetFeatureString()), *TM);
34
35 LLVMContext Ctx;
36 Module Mod("Module", Ctx);
37 Mod.setDataLayout(TM->createDataLayout());
38
39 auto *Type = FunctionType::get(Type::getVoidTy(Ctx), false);
40 auto *F = Function::Create(Type, GlobalValue::ExternalLinkage, "Test", &Mod);
41
42 MachineModuleInfo MMI(TM.get());
43 auto MF = std::make_unique<MachineFunction>(*F, *TM, ST, 42, MMI);
44 auto *BB = MF->CreateMachineBasicBlock();
45 MF->push_back(BB);
46
47 auto E = BB->end();
48 DebugLoc DL;
49 const auto &TII = *ST.getInstrInfo();
50 auto &MRI = MF->getRegInfo();
51
52 // create machine IR
53 Register R = MRI.createVirtualRegister(&AMDGPU::SReg_32RegClass);
54
55 MachineInstr *DefMI =
56 BuildMI(*BB, E, DL, TII.get(AMDGPU::S_MOV_B32), R).addImm(42).getInstr();
57
58 auto First =
59 BuildMI(*BB, E, DL, TII.get(AMDGPU::S_NOP)).addReg(R, RegState::Implicit);
60
61 BuildMI(*BB, E, DL, TII.get(AMDGPU::S_NOP)).addReg(R, RegState::Implicit);
62
63 // this violates the continuous sequence of R's uses for the first S_NOP
64 First.addReg(R, RegState::Implicit);
65
66 #ifdef DEBUG_THIS_TEST
67 MF->dump();
68 MRI.dumpUses(R);
69 #endif
70
71 // make sure execMayBeModifiedBeforeAnyUse doesn't crash
72 ASSERT_FALSE(execMayBeModifiedBeforeAnyUse(MRI, R, *DefMI));
73 }
74