[SandboxIR][Bench] Initial patch for performance tracking (#107296)

This patch adds a new benchmark suite for SandboxIR. It measures the
performance of some of the most commonly used API functions and compares
it against LLVM IR.

llvm/benchmarks/CMakeLists.txt

@@ -1,5 +1,7 @@
 set(LLVM_LINK_COMPONENTS
+  AsmParser
   Core
+  SandboxIR
   Support)
 
 add_benchmark(DummyYAML DummyYAML.cpp PARTIAL_SOURCES_INTENDED)
@@ -7,3 +9,5 @@ add_benchmark(xxhash xxhash.cpp PARTIAL_SOURCES_INTENDED)
 add_benchmark(GetIntrinsicForClangBuiltin GetIntrinsicForClangBuiltin.cpp PARTIAL_SOURCES_INTENDED)
 add_benchmark(FormatVariadicBM FormatVariadicBM.cpp PARTIAL_SOURCES_INTENDED)
 add_benchmark(GetIntrinsicInfoTableEntriesBM GetIntrinsicInfoTableEntriesBM.cpp PARTIAL_SOURCES_INTENDED)
+add_benchmark(SandboxIRBench SandboxIRBench.cpp PARTIAL_SOURCES_INTENDED)
+

llvm/benchmarks/SandboxIRBench.cpp

@@ -0,0 +1,115 @@
+//===- SandboxIRBench.cpp -------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// These tests measure the performance of some core SandboxIR functions and
+// compare them against LLVM IR.
+//
+//===----------------------------------------------------------------------===//
+
+#include "benchmark/benchmark.h"
+#include "llvm/AsmParser/Parser.h"
+#include "llvm/IR/BasicBlock.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Instruction.h"
+#include "llvm/IR/Module.h"
+#include "llvm/SandboxIR/SandboxIR.h"
+#include "llvm/Support/SourceMgr.h"
+#include <memory>
+
+using namespace llvm;
+
+static std::unique_ptr<Module> parseIR(LLVMContext &C, const char *IR) {
+  SMDiagnostic Err;
+  std::unique_ptr<Module> M = parseAssemblyString(IR, Err, C);
+  if (!M)
+    Err.print("SandboxIRBench", errs());
+  return M;
+}
+
+enum class IR {
+  LLVM,
+  SBox,
+};
+// Traits to get llvm::BasicBlock/sandboxir::BasicBlock from IR::LLVM/IR::SBox.
+template <IR IRTy> struct TypeSelect {};
+template <> struct TypeSelect<IR::LLVM> {
+  using BasicBlock = llvm::BasicBlock;
+};
+template <> struct TypeSelect<IR::SBox> {
+  using BasicBlock = sandboxir::BasicBlock;
+};
+
+template <IR IRTy>
+static typename TypeSelect<IRTy>::BasicBlock *
+genIR(std::unique_ptr<llvm::Module> &LLVMM, LLVMContext &LLVMCtx,
+      sandboxir::Context &Ctx,
+      std::function<std::string(unsigned)> GenerateIRStr,
+      unsigned NumInstrs = 0u) {
+  std::string IRStr = GenerateIRStr(NumInstrs);
+  LLVMM = parseIR(LLVMCtx, IRStr.c_str());
+  llvm::Function *LLVMF = &*LLVMM->getFunction("foo");
+  llvm::BasicBlock *LLVMBB = &*LLVMF->begin();
+
+  sandboxir::Function *F = Ctx.createFunction(LLVMF);
+  sandboxir::BasicBlock *BB = &*F->begin();
+  if constexpr (IRTy == IR::LLVM)
+    return LLVMBB;
+  else
+    return BB;
+}
+
+static std::string generateBBWalkIR(unsigned Size) {
+  std::stringstream SS;
+  SS << "define void @foo(i32 %v1, i32 %v2) {\n";
+  for (auto Cnt : seq<unsigned>(0, Size))
+    SS << "  %add" << Cnt << " = add i32 %v1, %v2\n";
+  SS << "ret void";
+  SS << "}";
+  return SS.str();
+}
+
+template <IR IRTy> static void BBWalk(benchmark::State &State) {
+  LLVMContext LLVMCtx;
+  sandboxir::Context Ctx(LLVMCtx);
+  unsigned NumInstrs = State.range(0);
+  std::unique_ptr<llvm::Module> LLVMM;
+  auto *BB = genIR<IRTy>(LLVMM, LLVMCtx, Ctx, generateBBWalkIR, NumInstrs);
+  for (auto _ : State) {
+    // Walk LLVM Instructions.
+    for (auto &I : *BB)
+      benchmark::DoNotOptimize(I);
+  }
+}
+
+static std::string generateGetTypeIR(unsigned Size) {
+  return R"IR(
+define void @foo(i32 %v1, i32 %v2) {
+  %add = add i32 %v1, %v2
+  ret void
+}
+)IR";
+}
+
+template <IR IRTy> static void GetType(benchmark::State &State) {
+  LLVMContext LLVMCtx;
+  sandboxir::Context Ctx(LLVMCtx);
+  std::unique_ptr<llvm::Module> LLVMM;
+  auto *BB = genIR<IRTy>(LLVMM, LLVMCtx, Ctx, generateGetTypeIR);
+  auto *I = &*BB->begin();
+  for (auto _ : State)
+    benchmark::DoNotOptimize(I->getType());
+}
+
+BENCHMARK(GetType<IR::LLVM>);
+BENCHMARK(GetType<IR::SBox>);
+
+BENCHMARK(BBWalk<IR::LLVM>)->Args({1024});
+BENCHMARK(BBWalk<IR::SBox>)->Args({1024});
+
+BENCHMARK_MAIN();