[LLVM][PassBuilder] Extend the function signature of callback for optimizer pipeline extension point #100953

shiltian · 2024-07-28T23:04:20Z

These callbacks can be invoked in multiple places when building an optimization
pipeline, both in compile time and link time. However, there is no indicator on
what pipeline it is currently building.

In this patch, an extra argument is added to indicate its (Thin)LTO stage such
that the callback can check it if needed. There is no test expected from this.

shiltian · 2024-07-28T23:04:37Z

[LLVM][PassBuilder] Extend the function signature of callback for optimizer pipeline extension point #100953 : 2 dependent PRs (#100954 , #101760 ) 👈
[Attributor][AMDGPU] Enable AAIndirectCallInfo for AMDAttributor #100952
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llvmbot · 2024-07-28T23:04:58Z

@llvm/pr-subscribers-clang-codegen

@llvm/pr-subscribers-backend-amdgpu

Author: Shilei Tian (shiltian)

Changes

These callbacks can be invoked in multiple places when building an optimization
pipeline, both in compile time and link time. However, there is no indicator on
what pipeline it is currently building.

In this patch, an extra argument is added to indicate its (Thin)LTO stage such
that the callback can check it if needed. There is no test expected from this,
and the benefit of this change will be demonstrated in #66488.

Full diff: https://github.com/llvm/llvm-project/pull/100953.diff

7 Files Affected:

(modified) clang/lib/CodeGen/BackendUtil.cpp (+10-9)
(modified) llvm/include/llvm/Passes/PassBuilder.h (+7-3)
(modified) llvm/lib/Passes/PassBuilderPipelines.cpp (+7-5)
(modified) llvm/lib/Target/AMDGPU/AMDGPU.h (+6-1)
(modified) llvm/lib/Target/AMDGPU/AMDGPUAttributor.cpp (+7-4)
(modified) llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp (+9-6)
(modified) llvm/tools/opt/NewPMDriver.cpp (+1-1)

diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index e765bbf637a66..64f0020a170aa 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -643,7 +643,7 @@ static void addKCFIPass(const Triple &TargetTriple, const LangOptions &LangOpts,
 
   // Ensure we lower KCFI operand bundles with -O0.
   PB.registerOptimizerLastEPCallback(
-      [&](ModulePassManager &MPM, OptimizationLevel Level) {
+      [&](ModulePassManager &MPM, OptimizationLevel Level, ThinOrFullLTOPhase) {
         if (Level == OptimizationLevel::O0 &&
             LangOpts.Sanitize.has(SanitizerKind::KCFI))
           MPM.addPass(createModuleToFunctionPassAdaptor(KCFIPass()));
@@ -662,8 +662,8 @@ static void addKCFIPass(const Triple &TargetTriple, const LangOptions &LangOpts,
 static void addSanitizers(const Triple &TargetTriple,
                           const CodeGenOptions &CodeGenOpts,
                           const LangOptions &LangOpts, PassBuilder &PB) {
-  auto SanitizersCallback = [&](ModulePassManager &MPM,
-                                OptimizationLevel Level) {
+  auto SanitizersCallback = [&](ModulePassManager &MPM, OptimizationLevel Level,
+                                ThinOrFullLTOPhase) {
     if (CodeGenOpts.hasSanitizeCoverage()) {
       auto SancovOpts = getSancovOptsFromCGOpts(CodeGenOpts);
       MPM.addPass(SanitizerCoveragePass(
@@ -749,7 +749,7 @@ static void addSanitizers(const Triple &TargetTriple,
     PB.registerOptimizerEarlyEPCallback(
         [SanitizersCallback](ModulePassManager &MPM, OptimizationLevel Level) {
           ModulePassManager NewMPM;
-          SanitizersCallback(NewMPM, Level);
+          SanitizersCallback(NewMPM, Level, ThinOrFullLTOPhase::None);
           if (!NewMPM.isEmpty()) {
             // Sanitizers can abandon<GlobalsAA>.
             NewMPM.addPass(RequireAnalysisPass<GlobalsAA, llvm::Module>());
@@ -1018,11 +1018,12 @@ void EmitAssemblyHelper::RunOptimizationPipeline(
     // TODO: Consider passing the MemoryProfileOutput to the pass builder via
     // the PGOOptions, and set this up there.
     if (!CodeGenOpts.MemoryProfileOutput.empty()) {
-      PB.registerOptimizerLastEPCallback(
-          [](ModulePassManager &MPM, OptimizationLevel Level) {
-            MPM.addPass(createModuleToFunctionPassAdaptor(MemProfilerPass()));
-            MPM.addPass(ModuleMemProfilerPass());
-          });
+      PB.registerOptimizerLastEPCallback([](ModulePassManager &MPM,
+                                            OptimizationLevel Level,
+                                            ThinOrFullLTOPhase) {
+        MPM.addPass(createModuleToFunctionPassAdaptor(MemProfilerPass()));
+        MPM.addPass(ModuleMemProfilerPass());
+      });
     }
 
     if (CodeGenOpts.FatLTO) {
diff --git a/llvm/include/llvm/Passes/PassBuilder.h b/llvm/include/llvm/Passes/PassBuilder.h
index 474a19531ff5d..4c2763404ff05 100644
--- a/llvm/include/llvm/Passes/PassBuilder.h
+++ b/llvm/include/llvm/Passes/PassBuilder.h
@@ -497,7 +497,8 @@ class PassBuilder {
   /// This extension point allows adding optimizations at the very end of the
   /// function optimization pipeline.
   void registerOptimizerLastEPCallback(
-      const std::function<void(ModulePassManager &, OptimizationLevel)> &C) {
+      const std::function<void(ModulePassManager &, OptimizationLevel,
+                               ThinOrFullLTOPhase)> &C) {
     OptimizerLastEPCallbacks.push_back(C);
   }
 
@@ -630,7 +631,8 @@ class PassBuilder {
   void invokeOptimizerEarlyEPCallbacks(ModulePassManager &MPM,
                                        OptimizationLevel Level);
   void invokeOptimizerLastEPCallbacks(ModulePassManager &MPM,
-                                      OptimizationLevel Level);
+                                      OptimizationLevel Level,
+                                      ThinOrFullLTOPhase Phase);
   void invokeFullLinkTimeOptimizationEarlyEPCallbacks(ModulePassManager &MPM,
                                                       OptimizationLevel Level);
   void invokeFullLinkTimeOptimizationLastEPCallbacks(ModulePassManager &MPM,
@@ -755,7 +757,9 @@ class PassBuilder {
   // Module callbacks
   SmallVector<std::function<void(ModulePassManager &, OptimizationLevel)>, 2>
       OptimizerEarlyEPCallbacks;
-  SmallVector<std::function<void(ModulePassManager &, OptimizationLevel)>, 2>
+  SmallVector<std::function<void(ModulePassManager &, OptimizationLevel,
+                                 ThinOrFullLTOPhase)>,
+              2>
       OptimizerLastEPCallbacks;
   SmallVector<std::function<void(ModulePassManager &, OptimizationLevel)>, 2>
       FullLinkTimeOptimizationEarlyEPCallbacks;
diff --git a/llvm/lib/Passes/PassBuilderPipelines.cpp b/llvm/lib/Passes/PassBuilderPipelines.cpp
index 757b20dcd6693..5827a485879d3 100644
--- a/llvm/lib/Passes/PassBuilderPipelines.cpp
+++ b/llvm/lib/Passes/PassBuilderPipelines.cpp
@@ -365,9 +365,10 @@ void PassBuilder::invokeOptimizerEarlyEPCallbacks(ModulePassManager &MPM,
     C(MPM, Level);
 }
 void PassBuilder::invokeOptimizerLastEPCallbacks(ModulePassManager &MPM,
-                                                 OptimizationLevel Level) {
+                                                 OptimizationLevel Level,
+                                                 ThinOrFullLTOPhase Phase) {
   for (auto &C : OptimizerLastEPCallbacks)
-    C(MPM, Level);
+    C(MPM, Level, Phase);
 }
 void PassBuilder::invokeFullLinkTimeOptimizationEarlyEPCallbacks(
     ModulePassManager &MPM, OptimizationLevel Level) {
@@ -1524,7 +1525,7 @@ PassBuilder::buildModuleOptimizationPipeline(OptimizationLevel Level,
   MPM.addPass(createModuleToFunctionPassAdaptor(std::move(OptimizePM),
                                                 PTO.EagerlyInvalidateAnalyses));
 
-  invokeOptimizerLastEPCallbacks(MPM, Level);
+  invokeOptimizerLastEPCallbacks(MPM, Level, LTOPhase);
 
   // Split out cold code. Splitting is done late to avoid hiding context from
   // other optimizations and inadvertently regressing performance. The tradeoff
@@ -1671,7 +1672,8 @@ PassBuilder::buildThinLTOPreLinkDefaultPipeline(OptimizationLevel Level) {
   // optimization is going to be done in PostLink stage, but clang can't add
   // callbacks there in case of in-process ThinLTO called by linker.
   invokeOptimizerEarlyEPCallbacks(MPM, Level);
-  invokeOptimizerLastEPCallbacks(MPM, Level);
+  invokeOptimizerLastEPCallbacks(MPM, Level,
+                                 ThinOrFullLTOPhase::ThinLTOPreLink);
 
   // Emit annotation remarks.
   addAnnotationRemarksPass(MPM);
@@ -2159,7 +2161,7 @@ ModulePassManager PassBuilder::buildO0DefaultPipeline(OptimizationLevel Level,
   CoroPM.addPass(GlobalDCEPass());
   MPM.addPass(CoroConditionalWrapper(std::move(CoroPM)));
 
-  invokeOptimizerLastEPCallbacks(MPM, Level);
+  invokeOptimizerLastEPCallbacks(MPM, Level, ThinOrFullLTOPhase::None);
 
   if (LTOPreLink)
     addRequiredLTOPreLinkPasses(MPM);
diff --git a/llvm/lib/Target/AMDGPU/AMDGPU.h b/llvm/lib/Target/AMDGPU/AMDGPU.h
index 46cc5f349555a..50aef36724f70 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPU.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPU.h
@@ -287,8 +287,13 @@ class AMDGPUAttributorPass : public PassInfoMixin<AMDGPUAttributorPass> {
 private:
   TargetMachine &TM;
 
+  /// Asserts whether we can assume whole program visibility.
+  bool HasWholeProgramVisibility = false;
+
 public:
-  AMDGPUAttributorPass(TargetMachine &TM) : TM(TM){};
+  AMDGPUAttributorPass(TargetMachine &TM,
+                       bool HasWholeProgramVisibility = false)
+      : TM(TM), HasWholeProgramVisibility(HasWholeProgramVisibility) {};
   PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM);
 };
 
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUAttributor.cpp b/llvm/lib/Target/AMDGPU/AMDGPUAttributor.cpp
index 51968063e8919..ab98da31b050f 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUAttributor.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUAttributor.cpp
@@ -1023,7 +1023,8 @@ static void addPreloadKernArgHint(Function &F, TargetMachine &TM) {
   }
 }
 
-static bool runImpl(Module &M, AnalysisGetter &AG, TargetMachine &TM) {
+static bool runImpl(Module &M, AnalysisGetter &AG, TargetMachine &TM,
+                    bool HasWholeProgramVisibility) {
   SetVector<Function *> Functions;
   for (Function &F : M) {
     if (!F.isIntrinsic())
@@ -1041,6 +1042,7 @@ static bool runImpl(Module &M, AnalysisGetter &AG, TargetMachine &TM) {
        &AAUnderlyingObjects::ID, &AAIndirectCallInfo::ID});
 
   AttributorConfig AC(CGUpdater);
+  AC.IsClosedWorldModule = HasWholeProgramVisibility;
   AC.Allowed = &Allowed;
   AC.IsModulePass = true;
   AC.DefaultInitializeLiveInternals = false;
@@ -1086,7 +1088,7 @@ class AMDGPUAttributorLegacy : public ModulePass {
 
   bool runOnModule(Module &M) override {
     AnalysisGetter AG(this);
-    return runImpl(M, AG, *TM);
+    return runImpl(M, AG, *TM, /*HasWholeProgramVisibility=*/false);
   }
 
   void getAnalysisUsage(AnalysisUsage &AU) const override {
@@ -1107,8 +1109,9 @@ PreservedAnalyses llvm::AMDGPUAttributorPass::run(Module &M,
   AnalysisGetter AG(FAM);
 
   // TODO: Probably preserves CFG
-  return runImpl(M, AG, TM) ? PreservedAnalyses::none()
-                            : PreservedAnalyses::all();
+  return runImpl(M, AG, TM, HasWholeProgramVisibility)
+             ? PreservedAnalyses::none()
+             : PreservedAnalyses::all();
 }
 
 char AMDGPUAttributorLegacy::ID = 0;
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
index c8fb68d1c0b0c..50cc2d871d4ec 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
@@ -735,12 +735,15 @@ void AMDGPUTargetMachine::registerPassBuilderCallbacks(PassBuilder &PB) {
       });
 
   // FIXME: Why is AMDGPUAttributor not in CGSCC?
-  PB.registerOptimizerLastEPCallback(
-      [this](ModulePassManager &MPM, OptimizationLevel Level) {
-        if (Level != OptimizationLevel::O0) {
-          MPM.addPass(AMDGPUAttributorPass(*this));
-        }
-      });
+  PB.registerOptimizerLastEPCallback([this](ModulePassManager &MPM,
+                                            OptimizationLevel Level,
+                                            ThinOrFullLTOPhase Phase) {
+    if (Level != OptimizationLevel::O0) {
+      MPM.addPass(AMDGPUAttributorPass(
+          *this, Phase == ThinOrFullLTOPhase::FullLTOPostLink ||
+                     Phase == ThinOrFullLTOPhase::ThinLTOPostLink));
+    }
+  });
 
   PB.registerFullLinkTimeOptimizationLastEPCallback(
       [this](ModulePassManager &PM, OptimizationLevel Level) {
diff --git a/llvm/tools/opt/NewPMDriver.cpp b/llvm/tools/opt/NewPMDriver.cpp
index 374698083763b..522a8c06d83c0 100644
--- a/llvm/tools/opt/NewPMDriver.cpp
+++ b/llvm/tools/opt/NewPMDriver.cpp
@@ -310,7 +310,7 @@ static void registerEPCallbacks(PassBuilder &PB) {
         });
   if (tryParsePipelineText<ModulePassManager>(PB, OptimizerLastEPPipeline))
     PB.registerOptimizerLastEPCallback(
-        [&PB](ModulePassManager &PM, OptimizationLevel) {
+        [&PB](ModulePassManager &PM, OptimizationLevel, ThinOrFullLTOPhase) {
           ExitOnError Err("Unable to parse OptimizerLastEP pipeline: ");
           Err(PB.parsePassPipeline(PM, OptimizerLastEPPipeline));
         });

jdoerfert · 2024-07-29T07:35:31Z

I thought I tried this myself. Does it really work, as in, is the mode set properly for full and thin lto? I think I had problems for one of them.

nikic

This seems fine to me in general. The patch stack seems to be messed up though, or at least this seems to contain some unrelated AMDGPU changes.

@jdoerfert Possibly the issue you saw is that this callback just isn't used by the post-link full LTO pipeline at all? It uses invokeFullLinkTimeOptimizationLastEPCallbacks instead. Maybe with this change it would make sense to remove that one and merge it into the main OptimizerLastEPCallback with the appropriate LTOPhase?

The other thing I wonder about is whether this argument should be added to other callbacks as well for consistency.

llvm/lib/Passes/PassBuilderPipelines.cpp

shiltian · 2024-07-29T13:25:21Z

This seems fine to me in general. The patch stack seems to be messed up though, or at least this seems to contain some unrelated AMDGPU changes.

It has some AMD changes because I'd like to demonstrate how the changes will be used.

The other thing I wonder about is whether this argument should be added to other callbacks as well for consistency.

Yeah, I was wondering that as well. I'm happy to do the changes but not sure if that's necessary.

shiltian · 2024-08-01T13:15:05Z

ping

if it is preferred to split the AMDGPU related changes to another PR, I can do that.

shiltian · 2024-08-05T15:06:49Z

ping +1

shiltian · 2024-08-07T02:52:06Z

This PR will not be needed if we decide to move AMDGPUAttributorPass to full LTO stage (#102086).

…imizer pipeline extension point These callbacks can be invoked in multiple places when building an optimization pipeline, both in compile time and link time. However, there is no indicator on what pipeline it is currently building. In this patch, an extra argument is added to indicate its (Thin)LTO stage such that the callback can check it if needed. There is no test expected from this, and the benefit of this change will be demonstrated in #66488.

jdoerfert · 2024-08-07T21:14:21Z

Split it, and maybe add the Phase to the rest as well. One commit to just make it consistent and pass the information along.
Second for the AMDGPU stuff.

@jdoerfert Possibly the issue you saw is that this callback just isn't used by the post-link full LTO pipeline at all? It uses invokeFullLinkTimeOptimizationLastEPCallbacks instead. Maybe with this change it would make sense to remove that one and merge it into the main OptimizerLastEPCallback with the appropriate LTOPhase?

The problem is that the OptimizerLastEPCallback is not called in FullLTO post link, IIRC. So this will alone not solve our issue. However, we still should tell the callbacks what phase we are in, consistently.

shiltian · 2024-08-08T23:30:19Z

This PR is no longer needed. We decided to move the AMDGPUAttributorPass to full LTO.

shiltian marked this pull request as ready for review July 28, 2024 23:04

shiltian mentioned this pull request Jul 28, 2024

[Attributor][AMDGPU] Enable AAIndirectCallInfo for AMDAttributor #100952

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llvmbot added clang Clang issues not falling into any other category backend:AMDGPU clang:codegen IR generation bugs: mangling, exceptions, etc. labels Jul 28, 2024

shiltian mentioned this pull request Jul 28, 2024

[LLVM][PassBuilder] Extend the function signature of callback for optimizer pipeline extension point #100945

Closed

shiltian requested review from Pierre-vh, arsenm, jdoerfert, nikic and teresajohnson July 28, 2024 23:05

shiltian mentioned this pull request Jul 28, 2024

[WIP][Attributor][AMDGPU] Improve the handling of indirect calls #100954

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nikic reviewed Jul 29, 2024

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shiltian mentioned this pull request Aug 2, 2024

[AMDGPU][Attributor] Add a pass parameter closed-world for AMDGPUAttributor pass #101760

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pr/amdgpu closed world #66488

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