c9d90f15af
CPU_CYCLES counter does not work on some Aarch64 CPUs; CYCLES is more generic and is equivalent to CPU_CYCLES in case the latter is supported. Longer story - CPU_CYCLES work only on CPU models explicitly recognized by libpfm4 ( via pfm_arm_detect_*() functions in https://sourceforge.net/p/perfmon2/libpfm4/ci/master/tree/lib/pfmlib_arm_armv8.c ) and its name is consistent with ARM documentation. However, the counter is architectural and is supported on all ARMv8 CPUs; libpfm4 recognizes generic PMU on unknown ARMv8 CPUs, but does not provide CPU_CYCLES event. Instead, CYCLES is provided (an alias to PERF_COUNT_HW_CPU_CYCLES). Physically, it is the same event with code 0x11. On supported architectures CYCLES also work, so the change should not introduce regression.
77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
//===-- TargetTest.cpp ------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "Target.h"
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#include <cassert>
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#include <memory>
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#include "MCTargetDesc/AArch64MCTargetDesc.h"
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#include "llvm/MC/TargetRegistry.h"
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#include "llvm/Support/TargetSelect.h"
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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namespace llvm {
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namespace exegesis {
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void InitializeAArch64ExegesisTarget();
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namespace {
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using testing::IsEmpty;
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using testing::Not;
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using testing::NotNull;
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constexpr const char kTriple[] = "aarch64-unknown-linux";
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class AArch64TargetTest : public ::testing::Test {
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protected:
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AArch64TargetTest()
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: ExegesisTarget_(ExegesisTarget::lookup(Triple(kTriple))) {
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EXPECT_THAT(ExegesisTarget_, NotNull());
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std::string error;
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Target_ = TargetRegistry::lookupTarget(kTriple, error);
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EXPECT_THAT(Target_, NotNull());
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STI_.reset(
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Target_->createMCSubtargetInfo(kTriple, "generic", /*no features*/ ""));
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}
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static void SetUpTestCase() {
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LLVMInitializeAArch64TargetInfo();
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LLVMInitializeAArch64Target();
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LLVMInitializeAArch64TargetMC();
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InitializeAArch64ExegesisTarget();
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}
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std::vector<MCInst> setRegTo(unsigned Reg, const APInt &Value) {
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return ExegesisTarget_->setRegTo(*STI_, Reg, Value);
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}
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const Target *Target_;
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const ExegesisTarget *const ExegesisTarget_;
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std::unique_ptr<MCSubtargetInfo> STI_;
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};
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TEST_F(AArch64TargetTest, SetRegToConstant) {
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// The AArch64 target currently doesn't know how to set register values.
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const auto Insts = setRegTo(AArch64::X0, APInt());
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EXPECT_THAT(Insts, Not(IsEmpty()));
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}
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TEST_F(AArch64TargetTest, DefaultPfmCounters) {
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const std::string Expected = "CYCLES";
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EXPECT_EQ(ExegesisTarget_->getPfmCounters("").CycleCounter, Expected);
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EXPECT_EQ(ExegesisTarget_->getPfmCounters("unknown_cpu").CycleCounter,
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Expected);
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}
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} // namespace
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} // namespace exegesis
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} // namespace llvm
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