InstSizes.cpp
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#include "AArch64Subtarget.h"
#include "AArch64TargetMachine.h"
#include "llvm/CodeGen/MIRParser/MIRParser.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
std::unique_ptr<LLVMTargetMachine> createTargetMachine() {
auto TT(Triple::normalize("aarch64--"));
std::string CPU("generic");
std::string FS("");
LLVMInitializeAArch64TargetInfo();
LLVMInitializeAArch64Target();
LLVMInitializeAArch64TargetMC();
std::string Error;
const Target *TheTarget = TargetRegistry::lookupTarget(TT, Error);
return std::unique_ptr<LLVMTargetMachine>(static_cast<LLVMTargetMachine*>(
TheTarget->createTargetMachine(TT, CPU, FS, TargetOptions(), None, None,
CodeGenOpt::Default)));
}
std::unique_ptr<AArch64InstrInfo> createInstrInfo(TargetMachine *TM) {
AArch64Subtarget ST(TM->getTargetTriple(), std::string(TM->getTargetCPU()),
std::string(TM->getTargetFeatureString()), *TM,
/* isLittle */ false);
return std::make_unique<AArch64InstrInfo>(ST);
}
/// The \p InputIRSnippet is only needed for things that can't be expressed in
/// the \p InputMIRSnippet (global variables etc)
/// TODO: Some of this might be useful for other architectures as well - extract
/// the platform-independent parts somewhere they can be reused.
void runChecks(
LLVMTargetMachine *TM, AArch64InstrInfo *II, const StringRef InputIRSnippet,
const StringRef InputMIRSnippet,
std::function<void(AArch64InstrInfo &, MachineFunction &)> Checks) {
LLVMContext Context;
auto MIRString =
"--- |\n"
" declare void @sizes()\n"
+ InputIRSnippet.str() +
"...\n"
"---\n"
"name: sizes\n"
"body: |\n"
" bb.0:\n"
+ InputMIRSnippet.str();
std::unique_ptr<MemoryBuffer> MBuffer = MemoryBuffer::getMemBuffer(MIRString);
std::unique_ptr<MIRParser> MParser =
createMIRParser(std::move(MBuffer), Context);
ASSERT_TRUE(MParser);
std::unique_ptr<Module> M = MParser->parseIRModule();
ASSERT_TRUE(M);
M->setTargetTriple(TM->getTargetTriple().getTriple());
M->setDataLayout(TM->createDataLayout());
MachineModuleInfo MMI(TM);
bool Res = MParser->parseMachineFunctions(*M, MMI);
ASSERT_FALSE(Res);
auto F = M->getFunction("sizes");
ASSERT_TRUE(F != nullptr);
auto &MF = MMI.getOrCreateMachineFunction(*F);
Checks(*II, MF);
}
} // anonymous namespace
TEST(InstSizes, Authenticated) {
std::unique_ptr<LLVMTargetMachine> TM = createTargetMachine();
ASSERT_TRUE(TM);
std::unique_ptr<AArch64InstrInfo> II = createInstrInfo(TM.get());
auto isAuthInst = [](AArch64InstrInfo &II, MachineFunction &MF) {
auto I = MF.begin()->begin();
EXPECT_EQ(4u, II.getInstSizeInBytes(*I));
EXPECT_TRUE(I->getDesc().isAuthenticated());
};
runChecks(TM.get(), II.get(), "",
" \n"
" BLRAA $x10, $x9\n",
isAuthInst);
runChecks(TM.get(), II.get(), "",
" \n"
" RETAB implicit $lr, implicit $sp, implicit killed $x0\n",
isAuthInst);
runChecks(TM.get(), II.get(), "",
" \n"
" frame-destroy AUTIASP implicit-def $lr, implicit killed $lr, implicit $sp\n",
isAuthInst);
runChecks(TM.get(), II.get(), "",
" \n"
" frame-destroy AUTIBSP implicit-def $lr, implicit killed $lr, implicit $sp\n",
isAuthInst);
}
TEST(InstSizes, STACKMAP) {
std::unique_ptr<LLVMTargetMachine> TM = createTargetMachine();
ASSERT_TRUE(TM);
std::unique_ptr<AArch64InstrInfo> II = createInstrInfo(TM.get());
runChecks(TM.get(), II.get(), "", " STACKMAP 0, 16\n"
" STACKMAP 1, 32\n",
[](AArch64InstrInfo &II, MachineFunction &MF) {
auto I = MF.begin()->begin();
EXPECT_EQ(16u, II.getInstSizeInBytes(*I));
++I;
EXPECT_EQ(32u, II.getInstSizeInBytes(*I));
});
}
TEST(InstSizes, PATCHPOINT) {
std::unique_ptr<LLVMTargetMachine> TM = createTargetMachine();
std::unique_ptr<AArch64InstrInfo> II = createInstrInfo(TM.get());
runChecks(TM.get(), II.get(), "",
" PATCHPOINT 0, 16, 0, 0, 0, csr_aarch64_aapcs\n"
" PATCHPOINT 1, 32, 0, 0, 0, csr_aarch64_aapcs\n",
[](AArch64InstrInfo &II, MachineFunction &MF) {
auto I = MF.begin()->begin();
EXPECT_EQ(16u, II.getInstSizeInBytes(*I));
++I;
EXPECT_EQ(32u, II.getInstSizeInBytes(*I));
});
}
TEST(InstSizes, TLSDESC_CALLSEQ) {
std::unique_ptr<LLVMTargetMachine> TM = createTargetMachine();
std::unique_ptr<AArch64InstrInfo> II = createInstrInfo(TM.get());
runChecks(
TM.get(), II.get(),
" @ThreadLocalGlobal = external thread_local global i32, align 8\n",
" TLSDESC_CALLSEQ target-flags(aarch64-tls) @ThreadLocalGlobal\n",
[](AArch64InstrInfo &II, MachineFunction &MF) {
auto I = MF.begin()->begin();
EXPECT_EQ(16u, II.getInstSizeInBytes(*I));
});
}