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[MemProf] Allow cloning of callsites in recursive cycles #121985

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Jan 8, 2025
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[MemProf] Allow cloning of callsites in recursive cycles #121985

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[MemProf] Allow cloning of callsites in recursive cycles
teresajohnson Jan 7, 2025
e4afefc
Address comments
teresajohnson Jan 7, 2025
14e06cc
Change other flag to positive intent too
teresajohnson Jan 8, 2025
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48 changes: 43 additions & 5 deletions llvm/lib/Transforms/IPO/MemProfContextDisambiguation.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -122,6 +122,20 @@ static cl::opt<unsigned>
cl::desc("Max depth to recursively search for missing "
"frames through tail calls."));

// By default enable cloning of callsites involved with recursive cycles
static cl::opt<bool> SkipRecursiveCallsites(
"memprof-skip-recursive-callsites", cl::init(false), cl::Hidden,
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@snehasish snehasish Jan 7, 2025

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Can we use a flag with a positive intent here and below? It's easier to read and reason about.

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@teresajohnson teresajohnson Jan 7, 2025

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done

cl::desc("Prevent cloning of callsites involved in recursive cycles"));

// When enabled, try to detect and prevent cloning of recursive contexts.
// This is only necessary until we support cloning through recursive cycles.
// Leave off by default for now, as it requires a little bit of compile time
// overhead and doesn't affect correctness, it will just inflate the cold hinted
// bytes reporting a bit when -memprof-report-hinted-sizes is enabled.
static cl::opt<bool> SkipRecursiveContexts(
"memprof-skip-recursive-contexts", cl::init(false), cl::Hidden,
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@snehasish snehasish Jan 7, 2025

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Can you update this one to be positive intent too?

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@teresajohnson teresajohnson Jan 8, 2025

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done

cl::desc("Prevent cloning of contexts through recursive cycles"));

namespace llvm {
cl::opt<bool> EnableMemProfContextDisambiguation(
"enable-memprof-context-disambiguation", cl::init(false), cl::Hidden,
Expand Down Expand Up @@ -1236,9 +1250,13 @@ void CallsiteContextGraph<DerivedCCG, FuncTy, CallTy>::addStackNodesForMIB(
StackEntryIdToContextNodeMap[StackId] = StackNode;
StackNode->OrigStackOrAllocId = StackId;
}
auto Ins = StackIdSet.insert(StackId);
if (!Ins.second)
StackNode->Recursive = true;
// Marking a node recursive will prevent its cloning completely, even for
// non-recursive contexts flowing through it.
if (SkipRecursiveCallsites) {
auto Ins = StackIdSet.insert(StackId);
if (!Ins.second)
StackNode->Recursive = true;
}
StackNode->AllocTypes |= (uint8_t)AllocType;
PrevNode->addOrUpdateCallerEdge(StackNode, AllocType, LastContextId);
PrevNode = StackNode;
Expand Down Expand Up @@ -1375,8 +1393,11 @@ static void checkNode(const ContextNode<DerivedCCG, FuncTy, CallTy> *Node,
set_union(CallerEdgeContextIds, Edge->ContextIds);
}
// Node can have more context ids than callers if some contexts terminate at
// node and some are longer.
assert(NodeContextIds == CallerEdgeContextIds ||
// node and some are longer. If we are not skipping recursive callsites but
// haven't enabled skipping of recursive contexts, this will be violated for
// incompletely cloned recursive cycles, so skip the checking in that case.
assert(!(SkipRecursiveCallsites || SkipRecursiveContexts) ||
NodeContextIds == CallerEdgeContextIds ||
set_is_subset(CallerEdgeContextIds, NodeContextIds));
}
if (Node->CalleeEdges.size()) {
Expand Down Expand Up @@ -3370,6 +3391,20 @@ void CallsiteContextGraph<DerivedCCG, FuncTy, CallTy>::identifyClones(

assert(Node->AllocTypes != (uint8_t)AllocationType::None);

DenseSet<uint32_t> RecursiveContextIds;
// If we are not skipping recursive callsites, and have also enabled
// skipping of recursive contexts, look for context ids that show up in
// multiple caller edges.
if (!SkipRecursiveCallsites && SkipRecursiveContexts) {
DenseSet<uint32_t> AllCallerContextIds;
for (auto &CE : Node->CallerEdges) {
AllCallerContextIds.reserve(CE->getContextIds().size());
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AllCallerContextIds is reused across each CallerEdge without being cleared. I guess the intent here is to reserve it to the size of the largest one? Can you document the intent here?

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yep, done

for (auto Id : CE->getContextIds())
if (!AllCallerContextIds.insert(Id).second)
RecursiveContextIds.insert(Id);
}
}

// Iterate until we find no more opportunities for disambiguating the alloc
// types via cloning. In most cases this loop will terminate once the Node
// has a single allocation type, in which case no more cloning is needed.
Expand All @@ -3394,6 +3429,9 @@ void CallsiteContextGraph<DerivedCCG, FuncTy, CallTy>::identifyClones(
// allocation.
auto CallerEdgeContextsForAlloc =
set_intersection(CallerEdge->getContextIds(), AllocContextIds);
if (!RecursiveContextIds.empty())
CallerEdgeContextsForAlloc =
set_difference(CallerEdgeContextsForAlloc, RecursiveContextIds);
if (CallerEdgeContextsForAlloc.empty()) {
++EI;
continue;
Expand Down
141 changes: 141 additions & 0 deletions llvm/test/ThinLTO/X86/memprof-recursive.ll
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Original file line number Diff line number Diff line change
@@ -0,0 +1,141 @@
;; Test recursion handling during cloning.
;;
;; See llvm/test/Transforms/MemProfContextDisambiguation/recursive.ll for
;; information on how the test was created.

; RUN: opt -thinlto-bc %s >%t.o

;; By default we should enable cloning of contexts involved with recursive
;; cycles, but not through the cycle itself. I.e. until full support for
;; recursion is added, the cloned recursive call from C back to B (line 12) will
;; not be updated to call a clone.
; RUN: llvm-lto2 run %t.o -enable-memprof-context-disambiguation \
; RUN: -supports-hot-cold-new \
; RUN: -r=%t.o,_Z1Dv,plx \
; RUN: -r=%t.o,_Z1Ci,plx \
; RUN: -r=%t.o,_Z1Bi,plx \
; RUN: -r=%t.o,main,plx \
; RUN: -r=%t.o,_Znam, \
; RUN: -memprof-verify-ccg -memprof-verify-nodes \
; RUN: -pass-remarks=memprof-context-disambiguation \
; RUN: -o %t.out 2>&1 | FileCheck %s \
; RUN: --implicit-check-not "memprof_recursive3.cc:12:10: call in clone _Z1Ci.memprof.1 assigned" \
; RUN: --check-prefix=NOSKIP-RECUR-CALLSITES --check-prefix=NOSKIP-RECUR-CONTEXTS

;; Skipping recursive callsites should result in no cloning.
; RUN: llvm-lto2 run %t.o -enable-memprof-context-disambiguation \
; RUN: -supports-hot-cold-new \
; RUN: -r=%t.o,_Z1Dv,plx \
; RUN: -r=%t.o,_Z1Ci,plx \
; RUN: -r=%t.o,_Z1Bi,plx \
; RUN: -r=%t.o,main,plx \
; RUN: -r=%t.o,_Znam, \
; RUN: -memprof-verify-ccg -memprof-verify-nodes \
; RUN: -pass-remarks=memprof-context-disambiguation \
; RUN: -memprof-skip-recursive-callsites \
; RUN: -o %t.out 2>&1 | FileCheck %s --allow-empty \
; RUN: --implicit-check-not "memprof_recursive3.cc:12:10: call in clone _Z1Ci.memprof.1 assigned" \
; RUN: --implicit-check-not="created clone" \
; RUN: --implicit-check-not="marked with memprof allocation attribute cold"

;; Skipping recursive contexts should prevent spurious call to cloned version of
;; B from the context starting at memprof_recursive.cc:19:13, which is actually
;; recursive (until that support is added).
; RUN: llvm-lto2 run %t.o -enable-memprof-context-disambiguation \
; RUN: -supports-hot-cold-new \
; RUN: -r=%t.o,_Z1Dv,plx \
; RUN: -r=%t.o,_Z1Ci,plx \
; RUN: -r=%t.o,_Z1Bi,plx \
; RUN: -r=%t.o,main,plx \
; RUN: -r=%t.o,_Znam, \
; RUN: -memprof-verify-ccg -memprof-verify-nodes \
; RUN: -pass-remarks=memprof-context-disambiguation \
; RUN: -memprof-skip-recursive-contexts \
; RUN: -o %t.out 2>&1 | FileCheck %s \
; RUN: --implicit-check-not "memprof_recursive3.cc:12:10: call in clone _Z1Ci.memprof.1 assigned" \
; RUN: --check-prefix=NOSKIP-RECUR-CALLSITES --check-prefix=SKIP-RECUR-CONTEXTS

; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:4:0: created clone _Z1Dv.memprof.1
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:5:10: call in clone _Z1Dv marked with memprof allocation attribute notcold
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:5:10: call in clone _Z1Dv.memprof.1 marked with memprof allocation attribute cold
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:8:0: created clone _Z1Ci.memprof.1
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:10:12: call in clone _Z1Ci.memprof.1 assigned to call function clone _Z1Dv.memprof.1
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:14:0: created clone _Z1Bi.memprof.1
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:15:10: call in clone _Z1Bi.memprof.1 assigned to call function clone _Z1Ci.memprof.1
;; We should only call the cold clone for the recursive context if we haven't
;; enabled skipping of recursive contexts via -memprof-skip-recursive-contexts.
; NOSKIP-RECUR-CONTEXTS: memprof_recursive.cc:19:13: call in clone main assigned to call function clone _Z1Bi.memprof.1
; SKIP-RECUR-CONTEXTS-NOT: memprof_recursive.cc:19:13: call in clone main assigned to call function clone _Z1Bi.memprof.1
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:20:13: call in clone main assigned to call function clone _Z1Bi.memprof.1

target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

define ptr @_Z1Dv() !dbg !3 {
entry:
%call = tail call ptr @_Znam(i64 10), !dbg !6, !memprof !7, !callsite !14
ret ptr null
}

define ptr @_Z1Ci(i32 %n) !dbg !15 {
entry:
%call = tail call ptr @_Z1Dv(), !dbg !16, !callsite !17
br label %return

if.end: ; No predecessors!
%call1 = tail call ptr @_Z1Bi(i32 0), !dbg !18, !callsite !19
br label %return

return: ; preds = %if.end, %entry
ret ptr null
}

define ptr @_Z1Bi(i32 %n) !dbg !20 {
entry:
%call = tail call ptr @_Z1Ci(i32 0), !dbg !21, !callsite !22
ret ptr null
}

define i32 @main() {
entry:
%call = tail call ptr @_Z1Bi(i32 0), !dbg !23, !callsite !25
%call1 = tail call ptr @_Z1Bi(i32 0), !dbg !26, !callsite !27
%call2 = tail call ptr @_Z1Bi(i32 0), !dbg !28, !callsite !29
ret i32 0
}

declare ptr @_Znam(i64)

!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!2}

!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 20.0.0git (https://github.com/llvm/llvm-project.git 7aec6dc477f8148ed066d10dfc7a012a51b6599c)", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, splitDebugInlining: false, debugInfoForProfiling: true, nameTableKind: None)
!1 = !DIFile(filename: "memprof_recursive.cc", directory: ".", checksumkind: CSK_MD5, checksum: "2f15f63b187a0e0d40e7fdd18b10576a")
!2 = !{i32 2, !"Debug Info Version", i32 3}
!3 = distinct !DISubprogram(name: "D", linkageName: "_Z1Dv", scope: !1, file: !1, line: 4, type: !4, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
!4 = !DISubroutineType(types: !5)
!5 = !{}
!6 = !DILocation(line: 5, column: 10, scope: !3)
!7 = !{!8, !10, !12}
!8 = !{!9, !"cold"}
!9 = !{i64 6541423618768552252, i64 -200552803509692312, i64 -2954124005641725917, i64 6307901912192269588}
!10 = !{!11, !"notcold"}
!11 = !{i64 6541423618768552252, i64 -200552803509692312, i64 -2954124005641725917, i64 -7155190423157709404, i64 -2954124005641725917, i64 8632435727821051414}
!12 = !{!13, !"cold"}
!13 = !{i64 6541423618768552252, i64 -200552803509692312, i64 -2954124005641725917, i64 -7155190423157709404, i64 -2954124005641725917, i64 -3421689549917153178}
!14 = !{i64 6541423618768552252}
!15 = distinct !DISubprogram(name: "C", linkageName: "_Z1Ci", scope: !1, file: !1, line: 8, type: !4, scopeLine: 8, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
!16 = !DILocation(line: 10, column: 12, scope: !15)
!17 = !{i64 -200552803509692312}
!18 = !DILocation(line: 12, column: 10, scope: !15)
!19 = !{i64 -7155190423157709404}
!20 = distinct !DISubprogram(name: "B", linkageName: "_Z1Bi", scope: !1, file: !1, line: 14, type: !4, scopeLine: 14, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
!21 = !DILocation(line: 15, column: 10, scope: !20)
!22 = !{i64 -2954124005641725917}
!23 = !DILocation(line: 18, column: 13, scope: !24)
!24 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 17, type: !4, scopeLine: 17, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
!25 = !{i64 8632435727821051414}
!26 = !DILocation(line: 19, column: 13, scope: !24)
!27 = !{i64 -3421689549917153178}
!28 = !DILocation(line: 20, column: 13, scope: !24)
!29 = !{i64 6307901912192269588}
159 changes: 159 additions & 0 deletions llvm/test/Transforms/MemProfContextDisambiguation/recursive.ll
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@@ -0,0 +1,159 @@
;; Test recursion handling during cloning.
;;
;; Original code looks like:
;;
;; #include <stdlib.h>
;; #include <string.h>
;; #include <unistd.h>
;; __attribute((noinline)) char *D() {
;; return new char[10];
;; }
;; __attribute((noinline)) char *B(int n);
;; __attribute((noinline)) char *C(int n) {
;; if (!n) {
;; return D();
;; }
;; return B(n-1);
;; }
;; __attribute((noinline)) char *B(int n) {
;; return C(n);
;; }
;; int main(int argc, char **argv) {
;; char *x = B(1);
;; char *y = B(1);
;; char *z = B(0);
;; memset(x, 0, 10);
;; memset(y, 0, 10);
;; memset(z, 0, 10);
;; free(x);
;; sleep(200);
;; free(y);
;; free(z);
;; return 0;
;; }
;;
;; The IR was then reduced using llvm-reduce with the expected FileCheck input.

;; By default we should enable cloning of contexts involved with recursive
;; cycles, but not through the cycle itself. I.e. until full support for
;; recursion is added, the cloned recursive call from C back to B (line 12) will
;; not be updated to call a clone.
; RUN: opt -passes=memprof-context-disambiguation -supports-hot-cold-new \
; RUN: -memprof-verify-ccg -memprof-verify-nodes \
; RUN: -pass-remarks=memprof-context-disambiguation \
; RUN: %s -S 2>&1 | FileCheck %s \
; RUN: --implicit-check-not "memprof_recursive3.cc:12:10: call in clone _Z1Ci.memprof.1 assigned" \
; RUN: --check-prefix=ALL --check-prefix=NOSKIP-RECUR-CALLSITES --check-prefix=NOSKIP-RECUR-CONTEXTS

;; Skipping recursive callsites should result in no cloning.
; RUN: opt -passes=memprof-context-disambiguation -supports-hot-cold-new \
; RUN: -memprof-verify-ccg -memprof-verify-nodes \
; RUN: -pass-remarks=memprof-context-disambiguation \
; RUN: -memprof-skip-recursive-callsites \
; RUN: %s -S 2>&1 | FileCheck %s \
; RUN: --implicit-check-not "memprof_recursive3.cc:12:10: call in clone _Z1Ci.memprof.1 assigned" \
; RUN: --implicit-check-not="created clone" \
; RUN: --implicit-check-not="marked with memprof allocation attribute cold" \
; RUN: --check-prefix=ALL

;; Skipping recursive contexts should prevent spurious call to cloned version of
;; B from the context starting at memprof_recursive.cc:19:13, which is actually
;; recursive (until that support is added).
; RUN: opt -passes=memprof-context-disambiguation -supports-hot-cold-new \
; RUN: -memprof-verify-ccg -memprof-verify-nodes \
; RUN: -pass-remarks=memprof-context-disambiguation \
; RUN: -memprof-skip-recursive-contexts \
; RUN: %s -S 2>&1 | FileCheck %s \
; RUN: --implicit-check-not "memprof_recursive3.cc:12:10: call in clone _Z1Ci.memprof.1 assigned" \
; RUN: --check-prefix=ALL --check-prefix=NOSKIP-RECUR-CALLSITES --check-prefix=SKIP-RECUR-CONTEXTS

; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:4:0: created clone _Z1Dv.memprof.1
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:8:0: created clone _Z1Ci.memprof.1
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:14:0: created clone _Z1Bi.memprof.1
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:20:13: call in clone main assigned to call function clone _Z1Bi.memprof.1
;; We should only call the cold clone for the recursive context if we haven't
;; enabled skipping of recursive contexts via -memprof-skip-recursive-contexts.
; NOSKIP-RECUR-CONTEXTS: memprof_recursive.cc:19:13: call in clone main assigned to call function clone _Z1Bi.memprof.1
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:15:10: call in clone _Z1Bi.memprof.1 assigned to call function clone _Z1Ci.memprof.1
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:10:12: call in clone _Z1Ci.memprof.1 assigned to call function clone _Z1Dv.memprof.1
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:5:10: call in clone _Z1Dv.memprof.1 marked with memprof allocation attribute cold
;; We should call the original B for the recursive context if we have
;; enabled skipping of recursive contexts via -memprof-skip-recursive-contexts.
; SKIP-RECUR-CONTEXTS: memprof_recursive.cc:19:13: call in clone main assigned to call function clone _Z1Bi
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:12:10: call in clone _Z1Ci assigned to call function clone _Z1Bi
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:18:13: call in clone main assigned to call function clone _Z1Bi
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:15:10: call in clone _Z1Bi assigned to call function clone _Z1Ci
; NOSKIP-RECUR-CALLSITES: memprof_recursive.cc:10:12: call in clone _Z1Ci assigned to call function clone _Z1Dv
; ALL: memprof_recursive.cc:5:10: call in clone _Z1Dv marked with memprof allocation attribute notcold

target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

define ptr @_Z1Dv() !dbg !3 {
entry:
%call = tail call ptr @_Znam(i64 10), !dbg !6, !memprof !7, !callsite !14
ret ptr null
}

define ptr @_Z1Ci(i32 %n) !dbg !15 {
entry:
%call = tail call ptr @_Z1Dv(), !dbg !16, !callsite !17
br label %return

if.end: ; No predecessors!
%call1 = tail call ptr @_Z1Bi(i32 0), !dbg !18, !callsite !19
br label %return

return: ; preds = %if.end, %entry
ret ptr null
}

define ptr @_Z1Bi(i32 %n) !dbg !20 {
entry:
%call = tail call ptr @_Z1Ci(i32 0), !dbg !21, !callsite !22
ret ptr null
}

define i32 @main() {
entry:
%call = tail call ptr @_Z1Bi(i32 0), !dbg !23, !callsite !25
%call1 = tail call ptr @_Z1Bi(i32 0), !dbg !26, !callsite !27
%call2 = tail call ptr @_Z1Bi(i32 0), !dbg !28, !callsite !29
ret i32 0
}

declare ptr @_Znam(i64)

!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!2}

!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 20.0.0git (https://github.com/llvm/llvm-project.git 7aec6dc477f8148ed066d10dfc7a012a51b6599c)", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, splitDebugInlining: false, debugInfoForProfiling: true, nameTableKind: None)
!1 = !DIFile(filename: "memprof_recursive.cc", directory: ".", checksumkind: CSK_MD5, checksum: "2f15f63b187a0e0d40e7fdd18b10576a")
!2 = !{i32 2, !"Debug Info Version", i32 3}
!3 = distinct !DISubprogram(name: "D", linkageName: "_Z1Dv", scope: !1, file: !1, line: 4, type: !4, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
!4 = !DISubroutineType(types: !5)
!5 = !{}
!6 = !DILocation(line: 5, column: 10, scope: !3)
!7 = !{!8, !10, !12}
!8 = !{!9, !"cold"}
!9 = !{i64 6541423618768552252, i64 -200552803509692312, i64 -2954124005641725917, i64 6307901912192269588}
!10 = !{!11, !"notcold"}
!11 = !{i64 6541423618768552252, i64 -200552803509692312, i64 -2954124005641725917, i64 -7155190423157709404, i64 -2954124005641725917, i64 8632435727821051414}
!12 = !{!13, !"cold"}
!13 = !{i64 6541423618768552252, i64 -200552803509692312, i64 -2954124005641725917, i64 -7155190423157709404, i64 -2954124005641725917, i64 -3421689549917153178}
!14 = !{i64 6541423618768552252}
!15 = distinct !DISubprogram(name: "C", linkageName: "_Z1Ci", scope: !1, file: !1, line: 8, type: !4, scopeLine: 8, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
!16 = !DILocation(line: 10, column: 12, scope: !15)
!17 = !{i64 -200552803509692312}
!18 = !DILocation(line: 12, column: 10, scope: !15)
!19 = !{i64 -7155190423157709404}
!20 = distinct !DISubprogram(name: "B", linkageName: "_Z1Bi", scope: !1, file: !1, line: 14, type: !4, scopeLine: 14, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
!21 = !DILocation(line: 15, column: 10, scope: !20)
!22 = !{i64 -2954124005641725917}
!23 = !DILocation(line: 18, column: 13, scope: !24)
!24 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 17, type: !4, scopeLine: 17, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
!25 = !{i64 8632435727821051414}
!26 = !DILocation(line: 19, column: 13, scope: !24)
!27 = !{i64 -3421689549917153178}
!28 = !DILocation(line: 20, column: 13, scope: !24)
!29 = !{i64 6307901912192269588}
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