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