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[CGSCC] Add statistic on largest SCC visited #128073

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Merged
merged 2 commits into from
Feb 21, 2025
Merged

[CGSCC] Add statistic on largest SCC visited #128073

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8e45771
[CGSCC] Add statistic on largest SCC visited
aeubanks Feb 20, 2025
da61b23
simplify test
aeubanks Feb 20, 2025
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5 changes: 5 additions & 0 deletions llvm/lib/Analysis/CGSCCPassManager.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/Analysis/LazyCallGraph.h"
#include "llvm/IR/Constant.h"
Expand All @@ -33,6 +34,8 @@

using namespace llvm;

STATISTIC(LargestCGSCC, "Number of functions in the largest SCC");

// Explicit template instantiations and specialization definitions for core
// template typedefs.
namespace llvm {
Expand Down Expand Up @@ -82,6 +85,8 @@ PassManager<LazyCallGraph::SCC, CGSCCAnalysisManager, LazyCallGraph &,
if (!PI.runBeforePass(*Pass, *C))
continue;

LargestCGSCC.updateMax(C->size());

PreservedAnalyses PassPA = Pass->run(*C, AM, G, UR);

// Update the SCC if necessary.
Expand Down
18 changes: 18 additions & 0 deletions llvm/test/Other/largest-scc-stat.ll
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@@ -0,0 +1,18 @@
; REQUIRES: asserts
; RUN: opt -passes='no-op-cgscc' -disable-output -stats < %s 2>&1 | FileCheck %s --check-prefix=ONE
; RUN: opt -passes='cgscc(instcombine)' -disable-output -stats < %s 2>&1 | FileCheck %s --check-prefix=TWO

; ONE: 1 cgscc - Number of functions in the largest SCC
; TWO: 2 cgscc - Number of functions in the largest SCC

define void @f1() {
%f = bitcast ptr @f2 to ptr
call void %f()
ret void
}

define void @f2() {
%f = bitcast ptr @f1 to ptr
call void %f()
ret void
}