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//===- retref-bench.cc - XRay Instrumentation Benchmarks ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Define benchmarks for measuring the cost of XRay instrumentation (the sleds,
// the trampolines).
//
//===----------------------------------------------------------------------===//
#include <x86intrin.h>
#include "benchmark/benchmark.h"
#include "xray/xray_interface.h"
[[clang::xray_never_instrument]] __attribute__((noinline)) int
neverInstrumented() {
benchmark::ClobberMemory();
return 0;
}
[[clang::xray_never_instrument]] static void BM_ReturnNeverInstrumented(
benchmark::State& state) {
for (auto _ : state) {
benchmark::DoNotOptimize(neverInstrumented());
}
}
BENCHMARK(BM_ReturnNeverInstrumented);
[[clang::xray_always_instrument]] __attribute__((noinline)) int
alwaysInstrumented() {
benchmark::ClobberMemory();
return 0;
}
[[clang::xray_never_instrument]] static void BM_ReturnInstrumentedUnPatched(
benchmark::State& state) {
__xray_unpatch();
for (auto _ : state) {
int x;
benchmark::DoNotOptimize(x = alwaysInstrumented());
benchmark::ClobberMemory();
}
}
BENCHMARK(BM_ReturnInstrumentedUnPatched);
[[clang::xray_never_instrument]] static void BM_ReturnInstrumentedPatchedThenUnpatched(
benchmark::State& state) {
__xray_patch();
__xray_unpatch();
for (auto _ : state) {
int x;
benchmark::DoNotOptimize(x = alwaysInstrumented());
benchmark::ClobberMemory();
}
}
BENCHMARK(BM_ReturnInstrumentedPatchedThenUnpatched);
[[clang::xray_never_instrument]] static void BM_ReturnInstrumentedPatched(
benchmark::State& state) {
__xray_patch();
for (auto _ : state) {
int x;
benchmark::DoNotOptimize(alwaysInstrumented());
benchmark::ClobberMemory();
}
}
BENCHMARK(BM_ReturnInstrumentedPatched);
[[clang::xray_never_instrument]] static void BM_RDTSCP_Cost(
benchmark::State& state) {
for (auto _ : state) {
unsigned cpu;
unsigned tsc;
benchmark::DoNotOptimize(tsc = __rdtscp(&cpu));
benchmark::ClobberMemory();
}
}
volatile unsigned global_cpu;
volatile unsigned tsc;
[[clang::xray_never_instrument]] void benchmark_handler(int32_t,
XRayEntryType) {
unsigned cpu;
benchmark::DoNotOptimize(tsc = __rdtscp(&cpu));
global_cpu = cpu;
benchmark::ClobberMemory();
}
BENCHMARK(BM_RDTSCP_Cost);
[[clang::xray_never_instrument]] static void
BM_ReturnInstrumentedPatchedWithLogHandler(benchmark::State& state) {
__xray_set_handler(benchmark_handler);
__xray_patch();
benchmark::ClobberMemory();
for (auto _ : state) {
int x;
benchmark::DoNotOptimize(x = alwaysInstrumented());
benchmark::ClobberMemory();
}
__xray_remove_handler();
}
BENCHMARK(BM_ReturnInstrumentedPatchedWithLogHandler);
BENCHMARK_MAIN();
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