[NFC] Do not run CGProfilePass when not using integrated assembler

Summary:
CGProfilePass is run by default in certain new pass manager optimization pipeline. Assemblers other than llvm as (such as gnu as) cannot recognize the .cgprofile entries generated and emitted from this pass, causing build time error.

This patch adds new options in clang CodeGenOpts and PassBuilder options so that we can turn cgprofile off when not using integrated assembler.

Reviewers: Bigcheese, xur, george.burgess.iv, chandlerc, manojgupta

Reviewed By: manojgupta

Subscribers: manojgupta, void, hiraditya, dexonsmith, llvm-commits, tcwang, llozano

Tags: #llvm, #clang

Differential Revision: https://reviews.llvm.org/D62627

diff --git a/clang/include/clang/Basic/CodeGenOptions.def b/clang/include/clang/Basic/CodeGenOptions.def
index 5b59954..a62cf5e 100644 (file)
--- a/clang/include/clang/Basic/CodeGenOptions.def
+++ b/clang/include/clang/Basic/CodeGenOptions.def
@@ -254,6 +254,7 @@ CODEGENOPT(UnwindTables      , 1, 0) ///< Emit unwind tables.
 CODEGENOPT(VectorizeLoop     , 1, 0) ///< Run loop vectorizer.
 CODEGENOPT(VectorizeSLP      , 1, 0) ///< Run SLP vectorizer.
 CODEGENOPT(ProfileSampleAccurate, 1, 0) ///< Sample profile is accurate.
+CODEGENOPT(CallGraphProfile  , 1, 0) ///< Run call graph profile.
 
   /// Attempt to use register sized accesses to bit-fields in structures, when
   /// possible.

diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index 97b9727..4e8b722 100644 (file)
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -1108,6 +1108,7 @@ void EmitAssemblyHelper::EmitAssemblyWithNewPassManager(
   PTO.LoopInterleaving = CodeGenOpts.UnrollLoops;
   PTO.LoopVectorization = CodeGenOpts.VectorizeLoop;
   PTO.SLPVectorization = CodeGenOpts.VectorizeSLP;
+  PTO.CallGraphProfile = CodeGenOpts.CallGraphProfile;
   PTO.Coroutines = LangOpts.Coroutines;
 
   PassInstrumentationCallbacks PIC;
@@ -1518,6 +1519,7 @@ static void runThinLTOBackend(ModuleSummaryIndex *CombinedIndex, Module *M,
   Conf.PTO.LoopInterleaving = CGOpts.UnrollLoops;
   Conf.PTO.LoopVectorization = CGOpts.VectorizeLoop;
   Conf.PTO.SLPVectorization = CGOpts.VectorizeSLP;
+  Conf.PTO.CallGraphProfile = CGOpts.CallGraphProfile;
 
   // Context sensitive profile.
   if (CGOpts.hasProfileCSIRInstr()) {

diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index dc5e932..46ba46d 100644 (file)
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -823,6 +823,7 @@ static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
   Opts.RerollLoops = Args.hasArg(OPT_freroll_loops);
 
   Opts.DisableIntegratedAS = Args.hasArg(OPT_fno_integrated_as);
+  Opts.CallGraphProfile = !Opts.DisableIntegratedAS;
   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
   Opts.SampleProfileFile =
       std::string(Args.getLastArgValue(OPT_fprofile_sample_use_EQ));

diff --git a/llvm/include/llvm/Passes/PassBuilder.h b/llvm/include/llvm/Passes/PassBuilder.h
index 38af896..12e914d 100644 (file)
--- a/llvm/include/llvm/Passes/PassBuilder.h
+++ b/llvm/include/llvm/Passes/PassBuilder.h
@@ -105,6 +105,10 @@ public:
   /// Tuning option to disable promotion to scalars in LICM with MemorySSA, if
   /// the number of access is too large.
   unsigned LicmMssaNoAccForPromotionCap;
+
+  /// Tuning option to enable/disable call graph profile. Its default value is
+  /// that of the flag: `-enable-npm-call-graph-profile`.
+  bool CallGraphProfile;
 };
 
 /// This class provides access to building LLVM's passes.

diff --git a/llvm/lib/Passes/PassBuilder.cpp b/llvm/lib/Passes/PassBuilder.cpp
index 32d0a38..57c510b 100644 (file)
--- a/llvm/lib/Passes/PassBuilder.cpp
+++ b/llvm/lib/Passes/PassBuilder.cpp
@@ -237,6 +237,10 @@ static cl::opt<bool>
     EnableCHR("enable-chr-npm", cl::init(true), cl::Hidden,
               cl::desc("Enable control height reduction optimization (CHR)"));
 
+static cl::opt<bool> EnableCallGraphProfile(
+    "enable-npm-call-graph-profile", cl::init(true), cl::Hidden,
+    cl::desc("Enable call graph profile pass for the new PM (default = on)"));
+
 PipelineTuningOptions::PipelineTuningOptions() {
   LoopInterleaving = EnableLoopInterleaving;
   LoopVectorization = EnableLoopVectorization;
@@ -246,6 +250,7 @@ PipelineTuningOptions::PipelineTuningOptions() {
   Coroutines = false;
   LicmMssaOptCap = SetLicmMssaOptCap;
   LicmMssaNoAccForPromotionCap = SetLicmMssaNoAccForPromotionCap;
+  CallGraphProfile = EnableCallGraphProfile;
 }
 
 extern cl::opt<bool> EnableHotColdSplit;
@@ -1060,7 +1065,8 @@ ModulePassManager PassBuilder::buildModuleOptimizationPipeline(
   // Add the core optimizing pipeline.
   MPM.addPass(createModuleToFunctionPassAdaptor(std::move(OptimizePM)));
 
-  MPM.addPass(CGProfilePass());
+  if (PTO.CallGraphProfile)
+    MPM.addPass(CGProfilePass());
 
   // Now we need to do some global optimization transforms.
   // FIXME: It would seem like these should come first in the optimization

diff --git a/llvm/test/Other/new-pm-cgprofile.ll b/llvm/test/Other/new-pm-cgprofile.ll
new file mode 100644 (file)
index 0000000..c7fe31a
--- /dev/null
+++ b/llvm/test/Other/new-pm-cgprofile.ll
@@ -0,0 +1,11 @@
+; RUN: opt -debug-pass-manager -passes='default<O2>' %s 2>&1 |FileCheck %s --check-prefixes=DEFAULT
+; RUN: opt -debug-pass-manager -passes='default<O2>' -enable-npm-call-graph-profile=0 %s 2>&1 |FileCheck %s --check-prefixes=OFF
+; RUN: opt -debug-pass-manager -passes='default<O2>' -enable-npm-call-graph-profile=1 %s 2>&1 |FileCheck %s --check-prefixes=ON
+;
+; DEFAULT: Running pass: CGProfilePass
+; OFF-NOT: Running pass: CGProfilePass
+; ON: Running pass: CGProfilePass
+
+define void @foo() {
+  ret void
+}