[ctxprof] Flatten indirect call info in pre-thinlink compilation #134766

mtrofin · 2025-04-08T01:27:13Z

Same idea as in #134723 - flatten indirect call info in "VP" MD_prof metadata for the thinlinker, for cases that aren't covered by a contextual profile. If we don't ICP an indirect call target in the specialized module, the call will fall to the copy of that target outside the specialized module. If the graph under that target also has some indirect calls, in the absence of this pass, we'd have a steeper performance regression - because none of those would have a chance to be ICPed.

mtrofin · 2025-04-08T01:27:36Z

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llvmbot · 2025-04-08T02:18:22Z

@llvm/pr-subscribers-llvm-analysis

@llvm/pr-subscribers-pgo

Author: Mircea Trofin (mtrofin)

Changes

Same idea as in #134723 - flatten indirect call info in "VP" MD_prof metadata for the thinlinker, for cases that aren't covered by a contextual profile. If we don't ICP an indirect call target in the specialized module, the call will fall to the copy of that target outside the specialized module. If the graph under that target also has some indirect calls, in the absence of this pass, we'd have a steeper performance regression - because none of those would have a chance to be ICPed.

Full diff: https://github.com/llvm/llvm-project/pull/134766.diff

4 Files Affected:

(modified) llvm/include/llvm/Analysis/CtxProfAnalysis.h (+5)
(modified) llvm/lib/Analysis/CtxProfAnalysis.cpp (+14)
(modified) llvm/lib/Transforms/Instrumentation/PGOCtxProfFlattening.cpp (+57)
(added) llvm/test/Analysis/CtxProfAnalysis/flatten-insert-icp-mdprof.ll (+50)

diff --git a/llvm/include/llvm/Analysis/CtxProfAnalysis.h b/llvm/include/llvm/Analysis/CtxProfAnalysis.h
index 023b5a9bdb848..6f1c3696ca78c 100644
--- a/llvm/include/llvm/Analysis/CtxProfAnalysis.h
+++ b/llvm/include/llvm/Analysis/CtxProfAnalysis.h
@@ -21,6 +21,10 @@ namespace llvm {
 
 class CtxProfAnalysis;
 
+using FlatIndirectTargets = DenseMap<GlobalValue::GUID, uint64_t>;
+using CtxProfFlatIndirectCallProfile =
+    DenseMap<GlobalValue::GUID, DenseMap<uint32_t, FlatIndirectTargets>>;
+
 /// The instrumented contextual profile, produced by the CtxProfAnalysis.
 class PGOContextualProfile {
   friend class CtxProfAnalysis;
@@ -101,6 +105,7 @@ class PGOContextualProfile {
   void visit(ConstVisitor, const Function *F = nullptr) const;
 
   const CtxProfFlatProfile flatten() const;
+  const CtxProfFlatIndirectCallProfile flattenVirtCalls() const;
 
   bool invalidate(Module &, const PreservedAnalyses &PA,
                   ModuleAnalysisManager::Invalidator &) {
diff --git a/llvm/lib/Analysis/CtxProfAnalysis.cpp b/llvm/lib/Analysis/CtxProfAnalysis.cpp
index 4042c87369462..304a77014f407 100644
--- a/llvm/lib/Analysis/CtxProfAnalysis.cpp
+++ b/llvm/lib/Analysis/CtxProfAnalysis.cpp
@@ -334,6 +334,20 @@ const CtxProfFlatProfile PGOContextualProfile::flatten() const {
   return Flat;
 }
 
+const CtxProfFlatIndirectCallProfile
+PGOContextualProfile::flattenVirtCalls() const {
+  CtxProfFlatIndirectCallProfile Ret;
+  preorderVisit<const PGOCtxProfContext::CallTargetMapTy,
+                const PGOCtxProfContext>(
+      Profiles.Contexts, [&](const PGOCtxProfContext &Ctx) {
+        auto &Targets = Ret[Ctx.guid()];
+        for (const auto &[ID, SubctxSet] : Ctx.callsites())
+          for (const auto &Subctx : SubctxSet)
+            Targets[ID][Subctx.first] += Subctx.second.getEntrycount();
+      });
+  return Ret;
+}
+
 void CtxProfAnalysis::collectIndirectCallPromotionList(
     CallBase &IC, Result &Profile,
     SetVector<std::pair<CallBase *, Function *>> &Candidates) {
diff --git a/llvm/lib/Transforms/Instrumentation/PGOCtxProfFlattening.cpp b/llvm/lib/Transforms/Instrumentation/PGOCtxProfFlattening.cpp
index ffe0f385047c3..9b44d61726fa1 100644
--- a/llvm/lib/Transforms/Instrumentation/PGOCtxProfFlattening.cpp
+++ b/llvm/lib/Transforms/Instrumentation/PGOCtxProfFlattening.cpp
@@ -36,9 +36,12 @@
 #include "llvm/Transforms/Scalar/DCE.h"
 #include "llvm/Transforms/Utils/BasicBlockUtils.h"
 #include <deque>
+#include <functional>
 
 using namespace llvm;
 
+#define DEBUG_TYPE "ctx_prof_flatten"
+
 namespace {
 
 class ProfileAnnotator final {
@@ -414,6 +417,58 @@ void removeInstrumentation(Function &F) {
         I.eraseFromParent();
 }
 
+void annotateIndirectCall(
+    Module &M, CallBase &CB,
+    const DenseMap<uint32_t, FlatIndirectTargets> &FlatProf,
+    const InstrProfCallsite &Ins) {
+  auto Idx = Ins.getIndex()->getZExtValue();
+  auto FIt = FlatProf.find(Idx);
+  if (FIt == FlatProf.end())
+    return;
+  const auto &Targets = FIt->second;
+  SmallVector<InstrProfValueData, 2> Data;
+  uint64_t Sum = 0;
+  for (auto &[Guid, Count] : Targets) {
+    Data.push_back({/*.Value=*/Guid, /*.Count=*/Count});
+    Sum += Count;
+  }
+  struct InstrProfValueDataGTComparer {
+    bool operator()(const InstrProfValueData &A, const InstrProfValueData &B) {
+      return A.Count > B.Count;
+    }
+  };
+  llvm::sort(Data, InstrProfValueDataGTComparer());
+  llvm::annotateValueSite(M, CB, Data, Sum,
+                          InstrProfValueKind::IPVK_IndirectCallTarget,
+                          Data.size());
+  LLVM_DEBUG(dbgs() << "[ctxprof] flat indirect call prof: " << CB
+                    << CB.getMetadata(LLVMContext::MD_prof) << "\n");
+}
+
+// We normally return a "Changed" bool, but the calling pass' run assumes
+// something will change - some profile will be added - so this won't add much
+// by returning false when applicable.
+void annotateIndCalls(Module &M, const CtxProfAnalysis::Result &CtxProf) {
+  const auto FlatIndCalls = CtxProf.flattenVirtCalls();
+  for (auto &F : M) {
+    if (F.isDeclaration())
+      continue;
+    auto FlatProfIter = FlatIndCalls.find(AssignGUIDPass::getGUID(F));
+    if (FlatProfIter == FlatIndCalls.end())
+      continue;
+    const auto &FlatProf = FlatProfIter->second;
+    for (auto &BB : F) {
+      for (auto &I : BB) {
+        auto *CB = dyn_cast<CallBase>(&I);
+        if (!CB || !CB->isIndirectCall())
+          continue;
+        if (auto *Ins = CtxProfAnalysis::getCallsiteInstrumentation(*CB))
+          annotateIndirectCall(M, *CB, FlatProf, *Ins);
+      }
+    }
+  }
+}
+
 } // namespace
 
 PreservedAnalyses PGOCtxProfFlatteningPass::run(Module &M,
@@ -437,6 +492,8 @@ PreservedAnalyses PGOCtxProfFlatteningPass::run(Module &M,
   if (!IsPreThinlink && !CtxProf.isInSpecializedModule())
     return PreservedAnalyses::none();
 
+  if (IsPreThinlink)
+    annotateIndCalls(M, CtxProf);
   const auto FlattenedProfile = CtxProf.flatten();
 
   for (auto &F : M) {
diff --git a/llvm/test/Analysis/CtxProfAnalysis/flatten-insert-icp-mdprof.ll b/llvm/test/Analysis/CtxProfAnalysis/flatten-insert-icp-mdprof.ll
new file mode 100644
index 0000000000000..13beddc05c7a2
--- /dev/null
+++ b/llvm/test/Analysis/CtxProfAnalysis/flatten-insert-icp-mdprof.ll
@@ -0,0 +1,50 @@
+; REQUIRES:x86_64-linux
+
+; Test flattening indirect calls into "VP" MD_prof metadata, in prelink.
+
+; RUN: split-file %s %t
+; RUN: llvm-ctxprof-util fromYAML --input %t/profile.yaml --output %t/profile.ctxprofdata
+; RUN: opt -passes=ctx-prof-flatten-prethinlink %t/example.ll -use-ctx-profile=%t/profile.ctxprofdata \
+; RUN:   -S -o - | FileCheck %s --check-prefix=PRELINK
+
+; PRELINK:      call void @llvm.instrprof.callsite(ptr @foo, i64 1234, i32 2, i32 0, ptr %p)
+; PRELINK-NEXT: call void %p(), !prof ![[VPPROF:[0-9]+]]
+; PRELINK-NEXT: call void @llvm.instrprof.callsite(ptr @foo, i64 1234, i32 2, i32 1, ptr @bar)
+; PRELINK-NEXT: call void @bar(){{$}}
+; PRELINK:      ![[VPPROF]] = !{!"VP", i32 0, i64 5, i64 5678, i64 4, i64 5555, i64 1}
+
+; RUN: cp %t/example.ll %t/1234.ll
+; RUN: opt -passes=ctx-prof-flatten %t/1234.ll -use-ctx-profile=%t/profile.ctxprofdata \
+; RUN:   -S -o - | FileCheck %s --check-prefix=POSTLINK
+; RUN: opt -passes=ctx-prof-flatten %t/example.ll -use-ctx-profile=%t/profile.ctxprofdata \
+; RUN:   -S -o - | FileCheck %s --check-prefix=POSTLINK
+
+; POSTLINK-NOT: call void %p(), !prof
+;--- example.ll
+
+declare !guid !0 void @bar()
+
+define void @foo(ptr %p) !guid !1 {
+  call void @llvm.instrprof.increment(ptr @foo, i64 1234, i32 1, i32 0)
+  call void @llvm.instrprof.callsite(ptr @foo, i64 1234, i32 2, i32 0, ptr %p)
+  call void %p()
+  call void @llvm.instrprof.callsite(ptr @foo, i64 1234, i32 2, i32 1, ptr @bar)
+  call void @bar()
+  ret void
+}
+
+!0 = !{i64 8888}
+!1 = !{i64 1234}
+
+;--- profile.yaml
+Contexts:
+  - Guid: 1234
+    TotalRootEntryCount: 5
+    Counters: [5]
+    Callsites:
+      - - Guid: 5555
+          Counters: [1]
+        - Guid: 5678
+          Counters: [4]
+      - - Guid: 8888
+          Counters: [5]

llvmbot · 2025-04-08T02:18:22Z

@llvm/pr-subscribers-llvm-transforms

Author: Mircea Trofin (mtrofin)

Changes

Same idea as in #134723 - flatten indirect call info in "VP" MD_prof metadata for the thinlinker, for cases that aren't covered by a contextual profile. If we don't ICP an indirect call target in the specialized module, the call will fall to the copy of that target outside the specialized module. If the graph under that target also has some indirect calls, in the absence of this pass, we'd have a steeper performance regression - because none of those would have a chance to be ICPed.

Full diff: https://github.com/llvm/llvm-project/pull/134766.diff

4 Files Affected:

(modified) llvm/include/llvm/Analysis/CtxProfAnalysis.h (+5)
(modified) llvm/lib/Analysis/CtxProfAnalysis.cpp (+14)
(modified) llvm/lib/Transforms/Instrumentation/PGOCtxProfFlattening.cpp (+57)
(added) llvm/test/Analysis/CtxProfAnalysis/flatten-insert-icp-mdprof.ll (+50)

diff --git a/llvm/include/llvm/Analysis/CtxProfAnalysis.h b/llvm/include/llvm/Analysis/CtxProfAnalysis.h
index 023b5a9bdb848..6f1c3696ca78c 100644
--- a/llvm/include/llvm/Analysis/CtxProfAnalysis.h
+++ b/llvm/include/llvm/Analysis/CtxProfAnalysis.h
@@ -21,6 +21,10 @@ namespace llvm {
 
 class CtxProfAnalysis;
 
+using FlatIndirectTargets = DenseMap<GlobalValue::GUID, uint64_t>;
+using CtxProfFlatIndirectCallProfile =
+    DenseMap<GlobalValue::GUID, DenseMap<uint32_t, FlatIndirectTargets>>;
+
 /// The instrumented contextual profile, produced by the CtxProfAnalysis.
 class PGOContextualProfile {
   friend class CtxProfAnalysis;
@@ -101,6 +105,7 @@ class PGOContextualProfile {
   void visit(ConstVisitor, const Function *F = nullptr) const;
 
   const CtxProfFlatProfile flatten() const;
+  const CtxProfFlatIndirectCallProfile flattenVirtCalls() const;
 
   bool invalidate(Module &, const PreservedAnalyses &PA,
                   ModuleAnalysisManager::Invalidator &) {
diff --git a/llvm/lib/Analysis/CtxProfAnalysis.cpp b/llvm/lib/Analysis/CtxProfAnalysis.cpp
index 4042c87369462..304a77014f407 100644
--- a/llvm/lib/Analysis/CtxProfAnalysis.cpp
+++ b/llvm/lib/Analysis/CtxProfAnalysis.cpp
@@ -334,6 +334,20 @@ const CtxProfFlatProfile PGOContextualProfile::flatten() const {
   return Flat;
 }
 
+const CtxProfFlatIndirectCallProfile
+PGOContextualProfile::flattenVirtCalls() const {
+  CtxProfFlatIndirectCallProfile Ret;
+  preorderVisit<const PGOCtxProfContext::CallTargetMapTy,
+                const PGOCtxProfContext>(
+      Profiles.Contexts, [&](const PGOCtxProfContext &Ctx) {
+        auto &Targets = Ret[Ctx.guid()];
+        for (const auto &[ID, SubctxSet] : Ctx.callsites())
+          for (const auto &Subctx : SubctxSet)
+            Targets[ID][Subctx.first] += Subctx.second.getEntrycount();
+      });
+  return Ret;
+}
+
 void CtxProfAnalysis::collectIndirectCallPromotionList(
     CallBase &IC, Result &Profile,
     SetVector<std::pair<CallBase *, Function *>> &Candidates) {
diff --git a/llvm/lib/Transforms/Instrumentation/PGOCtxProfFlattening.cpp b/llvm/lib/Transforms/Instrumentation/PGOCtxProfFlattening.cpp
index ffe0f385047c3..9b44d61726fa1 100644
--- a/llvm/lib/Transforms/Instrumentation/PGOCtxProfFlattening.cpp
+++ b/llvm/lib/Transforms/Instrumentation/PGOCtxProfFlattening.cpp
@@ -36,9 +36,12 @@
 #include "llvm/Transforms/Scalar/DCE.h"
 #include "llvm/Transforms/Utils/BasicBlockUtils.h"
 #include <deque>
+#include <functional>
 
 using namespace llvm;
 
+#define DEBUG_TYPE "ctx_prof_flatten"
+
 namespace {
 
 class ProfileAnnotator final {
@@ -414,6 +417,58 @@ void removeInstrumentation(Function &F) {
         I.eraseFromParent();
 }
 
+void annotateIndirectCall(
+    Module &M, CallBase &CB,
+    const DenseMap<uint32_t, FlatIndirectTargets> &FlatProf,
+    const InstrProfCallsite &Ins) {
+  auto Idx = Ins.getIndex()->getZExtValue();
+  auto FIt = FlatProf.find(Idx);
+  if (FIt == FlatProf.end())
+    return;
+  const auto &Targets = FIt->second;
+  SmallVector<InstrProfValueData, 2> Data;
+  uint64_t Sum = 0;
+  for (auto &[Guid, Count] : Targets) {
+    Data.push_back({/*.Value=*/Guid, /*.Count=*/Count});
+    Sum += Count;
+  }
+  struct InstrProfValueDataGTComparer {
+    bool operator()(const InstrProfValueData &A, const InstrProfValueData &B) {
+      return A.Count > B.Count;
+    }
+  };
+  llvm::sort(Data, InstrProfValueDataGTComparer());
+  llvm::annotateValueSite(M, CB, Data, Sum,
+                          InstrProfValueKind::IPVK_IndirectCallTarget,
+                          Data.size());
+  LLVM_DEBUG(dbgs() << "[ctxprof] flat indirect call prof: " << CB
+                    << CB.getMetadata(LLVMContext::MD_prof) << "\n");
+}
+
+// We normally return a "Changed" bool, but the calling pass' run assumes
+// something will change - some profile will be added - so this won't add much
+// by returning false when applicable.
+void annotateIndCalls(Module &M, const CtxProfAnalysis::Result &CtxProf) {
+  const auto FlatIndCalls = CtxProf.flattenVirtCalls();
+  for (auto &F : M) {
+    if (F.isDeclaration())
+      continue;
+    auto FlatProfIter = FlatIndCalls.find(AssignGUIDPass::getGUID(F));
+    if (FlatProfIter == FlatIndCalls.end())
+      continue;
+    const auto &FlatProf = FlatProfIter->second;
+    for (auto &BB : F) {
+      for (auto &I : BB) {
+        auto *CB = dyn_cast<CallBase>(&I);
+        if (!CB || !CB->isIndirectCall())
+          continue;
+        if (auto *Ins = CtxProfAnalysis::getCallsiteInstrumentation(*CB))
+          annotateIndirectCall(M, *CB, FlatProf, *Ins);
+      }
+    }
+  }
+}
+
 } // namespace
 
 PreservedAnalyses PGOCtxProfFlatteningPass::run(Module &M,
@@ -437,6 +492,8 @@ PreservedAnalyses PGOCtxProfFlatteningPass::run(Module &M,
   if (!IsPreThinlink && !CtxProf.isInSpecializedModule())
     return PreservedAnalyses::none();
 
+  if (IsPreThinlink)
+    annotateIndCalls(M, CtxProf);
   const auto FlattenedProfile = CtxProf.flatten();
 
   for (auto &F : M) {
diff --git a/llvm/test/Analysis/CtxProfAnalysis/flatten-insert-icp-mdprof.ll b/llvm/test/Analysis/CtxProfAnalysis/flatten-insert-icp-mdprof.ll
new file mode 100644
index 0000000000000..13beddc05c7a2
--- /dev/null
+++ b/llvm/test/Analysis/CtxProfAnalysis/flatten-insert-icp-mdprof.ll
@@ -0,0 +1,50 @@
+; REQUIRES:x86_64-linux
+
+; Test flattening indirect calls into "VP" MD_prof metadata, in prelink.
+
+; RUN: split-file %s %t
+; RUN: llvm-ctxprof-util fromYAML --input %t/profile.yaml --output %t/profile.ctxprofdata
+; RUN: opt -passes=ctx-prof-flatten-prethinlink %t/example.ll -use-ctx-profile=%t/profile.ctxprofdata \
+; RUN:   -S -o - | FileCheck %s --check-prefix=PRELINK
+
+; PRELINK:      call void @llvm.instrprof.callsite(ptr @foo, i64 1234, i32 2, i32 0, ptr %p)
+; PRELINK-NEXT: call void %p(), !prof ![[VPPROF:[0-9]+]]
+; PRELINK-NEXT: call void @llvm.instrprof.callsite(ptr @foo, i64 1234, i32 2, i32 1, ptr @bar)
+; PRELINK-NEXT: call void @bar(){{$}}
+; PRELINK:      ![[VPPROF]] = !{!"VP", i32 0, i64 5, i64 5678, i64 4, i64 5555, i64 1}
+
+; RUN: cp %t/example.ll %t/1234.ll
+; RUN: opt -passes=ctx-prof-flatten %t/1234.ll -use-ctx-profile=%t/profile.ctxprofdata \
+; RUN:   -S -o - | FileCheck %s --check-prefix=POSTLINK
+; RUN: opt -passes=ctx-prof-flatten %t/example.ll -use-ctx-profile=%t/profile.ctxprofdata \
+; RUN:   -S -o - | FileCheck %s --check-prefix=POSTLINK
+
+; POSTLINK-NOT: call void %p(), !prof
+;--- example.ll
+
+declare !guid !0 void @bar()
+
+define void @foo(ptr %p) !guid !1 {
+  call void @llvm.instrprof.increment(ptr @foo, i64 1234, i32 1, i32 0)
+  call void @llvm.instrprof.callsite(ptr @foo, i64 1234, i32 2, i32 0, ptr %p)
+  call void %p()
+  call void @llvm.instrprof.callsite(ptr @foo, i64 1234, i32 2, i32 1, ptr @bar)
+  call void @bar()
+  ret void
+}
+
+!0 = !{i64 8888}
+!1 = !{i64 1234}
+
+;--- profile.yaml
+Contexts:
+  - Guid: 1234
+    TotalRootEntryCount: 5
+    Counters: [5]
+    Callsites:
+      - - Guid: 5555
+          Counters: [1]
+        - Guid: 5678
+          Counters: [4]
+      - - Guid: 8888
+          Counters: [5]

snehasish

lgtm

llvm/lib/Transforms/Instrumentation/PGOCtxProfFlattening.cpp

mtrofin · 2025-04-09T00:27:28Z

Merge activity

Apr 8, 8:27 PM EDT: A user started a stack merge that includes this pull request via Graphite.
Apr 8, 8:31 PM EDT: Graphite rebased this pull request as part of a merge.
Apr 8, 8:33 PM EDT: A user merged this pull request with Graphite.

This was referenced Apr 8, 2025

[ctxprof] Only prune the profile in modules containing only context trees #134340

Merged

[ctxprof] Use isInSpecializedModule as criteria for using contextual profile #134468

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mtrofin mentioned this pull request Apr 8, 2025

[ctxprof] Use the flattened contextual profile pre-thinlink #134723

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mtrofin force-pushed the users/mtrofin/04-07-_ctxprof_flatten_indirect_call_info_in_pre-thinlink_compilation branch from a492868 to 31ec58f Compare April 8, 2025 02:05

mtrofin marked this pull request as ready for review April 8, 2025 02:17

llvmbot added PGO Profile Guided Optimizations llvm:analysis Includes value tracking, cost tables and constant folding llvm:transforms labels Apr 8, 2025

mtrofin requested review from snehasish and teresajohnson April 8, 2025 02:19

mtrofin force-pushed the users/mtrofin/04-07-_ctxprof_use_the_flattened_contextual_profile_pre-thinlink branch from d1edfa2 to a31066a Compare April 8, 2025 02:57

mtrofin force-pushed the users/mtrofin/04-07-_ctxprof_flatten_indirect_call_info_in_pre-thinlink_compilation branch 3 times, most recently from a9b122b to 666db91 Compare April 8, 2025 14:14

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snehasish approved these changes Apr 8, 2025

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mtrofin force-pushed the users/mtrofin/04-07-_ctxprof_use_the_flattened_contextual_profile_pre-thinlink branch from f78fe14 to e465744 Compare April 8, 2025 22:59

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Base automatically changed from users/mtrofin/04-07-_ctxprof_use_the_flattened_contextual_profile_pre-thinlink to main April 9, 2025 00:30

[ctxprof] Flatten indirect call info in pre-thinlink compilation

01dbaf7

mtrofin force-pushed the users/mtrofin/04-07-_ctxprof_flatten_indirect_call_info_in_pre-thinlink_compilation branch from d0be075 to 01dbaf7 Compare April 9, 2025 00:31

mtrofin merged commit 442050c into main Apr 9, 2025
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mtrofin deleted the users/mtrofin/04-07-_ctxprof_flatten_indirect_call_info_in_pre-thinlink_compilation branch April 9, 2025 00:33

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