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[PseudoProbe] Mix block and call probe ID in lexical order (#75092)

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Before all the call probe ids are after block ids, in this change, it
mixed the call probe and block probe by reordering them in
lexical(line-number) order. For example:
```
main():
BB1
if(...) 
  BB2 foo(..);   
else 
  BB3 bar(...);
BB4
```
Before the profile is
```
main
 1: ..
 2: ..
 3: ...
 4: ...
 5: foo ...
 6: bar ...
 ```
 Now the new order is
```
 main
 1: ..
 2: ..
 3: foo ...
 4: ...
 5: bar ...
 6: ...
```
This can potentially make it more tolerant of profile mismatch, either from stale profile or frontend change. e.g. before if we add one block, even the block is the last one, all the call probes are shifted and mismatched. Moreover, this makes better use of call-anchor based stale profile matching. Blocks are matched based on the closest anchor, there would be more anchors used for the matching, reduce the mismatch scope.
This commit is contained in:
Lei Wang 2024-04-03 11:18:29 -07:00 committed by GitHub
parent 42c7bc04c3
commit 5bbce06ac6
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
13 changed files with 71 additions and 79 deletions
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8
clang/test/CodeGen/pseudo-probe-emit.c
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@ -10,9 +10,9 @@ void foo(int x) {
// CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 1, i32 0, i64 -1)
if (x == 0)
// CHECK: call void @llvm.pseudoprobe(i64 [[#GUID]], i64 2, i32 0, i64 -1)
bar();
bar(); // probe id : 3
else
// CHECK: call void @llvm.pseudoprobe(i64 [[#GUID]], i64 3, i32 0, i64 -1)
go();
// CHECK: call void @llvm.pseudoprobe(i64 [[#GUID]], i64 4, i32 0, i64 -1)
// CHECK: call void @llvm.pseudoprobe(i64 [[#GUID]], i64 4, i32 0, i64 -1)
go(); // probe id : 5
// CHECK: call void @llvm.pseudoprobe(i64 [[#GUID]], i64 6, i32 0, i64 -1)
}

4
llvm/include/llvm/ProfileData/SampleProf.h
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@ -466,7 +466,7 @@ struct SampleContextFrame {
LineLocation Location;
SampleContextFrame() : Location(0, 0) {}
SampleContextFrame(FunctionId Func, LineLocation Location)
: Func(Func), Location(Location) {}
@ -527,7 +527,7 @@ public:
: Func(Name), State(UnknownContext), Attributes(ContextNone) {
assert(!Name.empty() && "Name is empty");
}
SampleContext(FunctionId Func)
: Func(Func), State(UnknownContext), Attributes(ContextNone) {}

6
llvm/include/llvm/Transforms/IPO/SampleProfileProbe.h
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@ -85,14 +85,12 @@ private:
void findInvokeNormalDests(DenseSet<BasicBlock *> &InvokeNormalDests);
void computeBlocksToIgnore(DenseSet<BasicBlock *> &BlocksToIgnore,
DenseSet<BasicBlock *> &BlocksAndCallsToIgnore);
void computeProbeIdForCallsites(
const DenseSet<BasicBlock *> &BlocksAndCallsToIgnore);
const Instruction *
getOriginalTerminator(const BasicBlock *Head,
const DenseSet<BasicBlock *> &BlocksToIgnore);
void computeCFGHash(const DenseSet<BasicBlock *> &BlocksToIgnore);
void computeProbeIdForBlocks(const DenseSet<BasicBlock *> &BlocksToIgnore);
void computeProbeIdForCallsites();
void computeProbeId(const DenseSet<BasicBlock *> &BlocksToIgnore,
const DenseSet<BasicBlock *> &BlocksAndCallsToIgnore);
Function *F;

22
llvm/lib/Transforms/IPO/SampleProfileProbe.cpp
View File

@ -178,8 +178,7 @@ SampleProfileProber::SampleProfileProber(Function &Func,
DenseSet<BasicBlock *> BlocksAndCallsToIgnore;
computeBlocksToIgnore(BlocksToIgnore, BlocksAndCallsToIgnore);
computeProbeIdForBlocks(BlocksToIgnore);
computeProbeIdForCallsites(BlocksAndCallsToIgnore);
computeProbeId(BlocksToIgnore, BlocksAndCallsToIgnore);
computeCFGHash(BlocksToIgnore);
}
@ -300,27 +299,20 @@ void SampleProfileProber::computeCFGHash(
<< ", Hash = " << FunctionHash << "\n");
}
void SampleProfileProber::computeProbeIdForBlocks(
const DenseSet<BasicBlock *> &BlocksToIgnore) {
for (auto &BB : *F) {
if (BlocksToIgnore.contains(&BB))
continue;
BlockProbeIds[&BB] = ++LastProbeId;
}
}
void SampleProfileProber::computeProbeIdForCallsites(
void SampleProfileProber::computeProbeId(
const DenseSet<BasicBlock *> &BlocksToIgnore,
const DenseSet<BasicBlock *> &BlocksAndCallsToIgnore) {
LLVMContext &Ctx = F->getContext();
Module *M = F->getParent();
for (auto &BB : *F) {
if (!BlocksToIgnore.contains(&BB))
BlockProbeIds[&BB] = ++LastProbeId;
if (BlocksAndCallsToIgnore.contains(&BB))
continue;
for (auto &I : BB) {
if (!isa<CallBase>(I))
continue;
if (isa<IntrinsicInst>(&I))
if (!isa<CallBase>(I) || isa<IntrinsicInst>(&I))
continue;
// The current implementation uses the lower 16 bits of the discriminator

8
llvm/test/Transforms/SampleProfile/Inputs/pseudo-probe-profile.prof
View File

@ -1,8 +1,8 @@
foo:3200:13
1: 13
2: 7
3: 6
4: 13
5: 7 _Z3barv:2 _Z3foov:5
6: 6 _Z3barv:4 _Z3foov:2
4: 6
6: 13
3: 7 _Z3barv:2 _Z3foov:5
5: 6 _Z3barv:4 _Z3foov:2
!CFGChecksum: 563022570642068

8
llvm/test/Transforms/SampleProfile/Inputs/pseudo-probe-update.prof
View File

@ -1,8 +1,8 @@
foo:3200:13
1: 13
2: 7
3: 6
4: 13
5: 7
6: 6
4: 6
6: 13
7: 7
9: 6
!CFGChecksum: 844530426352218

12
llvm/test/Transforms/SampleProfile/pseudo-probe-dangle.ll
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@ -23,21 +23,21 @@ Merge:
; JT-LABEL-NO: T
; JT-LABEL-NO: F
; JT-LABEL: Merge
; JT-NOT: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 4
; JT-NOT: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 3
; JT-NOT: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 2
; JT: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 4, i32 0, i64 -1)
; JT: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 5, i32 0, i64 -1)
; ASM-NOT: .pseudoprobe 6699318081062747564 4
; ASM-NOT: .pseudoprobe 6699318081062747564 3
; ASM-NOT: .pseudoprobe 6699318081062747564 2
; ASM: .pseudoprobe 6699318081062747564 4 0 0
; ASM: .pseudoprobe 6699318081062747564 5 0 0
ret i32 %call
}
;; Check block T and F are gone, and their probes (probe 2 and 3) are gone too.
; MIR-tail: bb.0
; MIR-tail: PSEUDO_PROBE [[#GUID:]], 1, 0, 0
; MIR-tail-NOT: PSEUDO_PROBE [[#GUID:]], 2
; MIR-tail-NOT: PSEUDO_PROBE [[#GUID:]], 3
; MIR-tail: PSEUDO_PROBE [[#GUID:]], 4, 0, 0
; MIR-tail-NOT: PSEUDO_PROBE [[#GUID:]], 4
; MIR-tail: PSEUDO_PROBE [[#GUID:]], 5, 0, 0
define i32 @test(i32 %a, i32 %b, i32 %c) {

6
llvm/test/Transforms/SampleProfile/pseudo-probe-discriminator.ll
View File

@ -62,10 +62,10 @@ attributes #1 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "fra
; DEBUG: ![[INST]] = !DILocation(line: 4, column: 15, scope: ![[INSTBLOCK:[0-9]+]])
; DEBUG: ![[INSTBLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 4)
; PROBE: ![[CALL1]] = !DILocation(line: 4, column: 3, scope: ![[CALL1BLOCK:[0-9]+]])
; PROBE: ![[CALL1BLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 186646575)
; PROBE: ![[CALL1BLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 186646559)
; PROBE: ![[CALL2]] = !DILocation(line: 4, column: 9, scope: ![[CALL2BLOCK:[0-9]+]])
; PROBE: ![[CALL2BLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 186646583)
; PROBE: ![[CALL2BLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 186646567)
; PROBE: ![[INST]] = !DILocation(line: 4, column: 15, scope: ![[INSTBLOCK:[0-9]+]])
; PROBE: ![[INSTBLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 4)

12
llvm/test/Transforms/SampleProfile/pseudo-probe-invoke.ll
View File

@ -18,10 +18,12 @@ entry:
if.then: ; preds = %entry
; CHECK: call void @llvm.pseudoprobe(i64 -1069303473483922844, i64 2
; callsite probe 3
invoke void @_Z3foov()
to label %invoke.cont unwind label %terminate.lpad, !dbg !24
invoke.cont: ; preds = %if.then
; callsite probe 4
; CHECK-NOT: call void @llvm.pseudoprobe(i64 -1069303473483922844,
invoke void @_Z3bazv()
to label %invoke.cont1 unwind label %terminate.lpad, !dbg !26
@ -31,7 +33,8 @@ invoke.cont1: ; preds = %invoke.cont
br label %if.end, !dbg !27
if.else: ; preds = %entry
; CHECK: call void @llvm.pseudoprobe(i64 -1069303473483922844, i64 3
; CHECK: call void @llvm.pseudoprobe(i64 -1069303473483922844, i64 5
; callsite probe 6
invoke void @_Z3foov()
to label %invoke.cont2 unwind label %terminate.lpad, !dbg !28
@ -40,7 +43,8 @@ invoke.cont2: ; preds = %if.else
br label %if.end
if.end: ; preds = %invoke.cont2, %invoke.cont1
; CHECK: call void @llvm.pseudoprobe(i64 -1069303473483922844, i64 4
; CHECK: call void @llvm.pseudoprobe(i64 -1069303473483922844, i64 7
; callsite probe 8
invoke void @_Z3foov()
to label %invoke.cont3 unwind label %terminate.lpad, !dbg !29
@ -51,14 +55,14 @@ invoke.cont3: ; preds = %if.end
br i1 %tobool4, label %if.then5, label %if.end6, !dbg !32
if.then5: ; preds = %invoke.cont3
; CHECK: call void @llvm.pseudoprobe(i64 -1069303473483922844, i64 5
; CHECK: call void @llvm.pseudoprobe(i64 -1069303473483922844, i64 9
%2 = load volatile i32, ptr @x, align 4, !dbg !33, !tbaa !19
%inc = add nsw i32 %2, 1, !dbg !33
store volatile i32 %inc, ptr @x, align 4, !dbg !33, !tbaa !19
br label %if.end6, !dbg !35
if.end6: ; preds = %if.then5, %invoke.cont3
; CHECK: call void @llvm.pseudoprobe(i64 -1069303473483922844, i64 6
; CHECK: call void @llvm.pseudoprobe(i64 -1069303473483922844, i64 10
ret void, !dbg !36
terminate.lpad: ; preds = %if.end, %if.else, %invoke.cont, %if.then

15
llvm/test/Transforms/SampleProfile/pseudo-probe-profile-metadata-2.ll
View File

@ -29,7 +29,7 @@ if.else:
br label %return
return:
call void @llvm.pseudoprobe(i64 6699318081062747564, i64 4, i32 0, i64 -1)
call void @llvm.pseudoprobe(i64 6699318081062747564, i64 6, i32 0, i64 -1)
%1 = load i32, ptr %retval, align 4
ret i32 %1
}
@ -55,13 +55,12 @@ attributes #0 = {"use-sample-profile"}
!9 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !5, isOptimized: false, runtimeVersion: 0, emissionKind: NoDebug)
!10 = !{!"function_entry_count", i64 14}
!11 = !{!"branch_weights", i32 100, i32 0}
;; A discriminator of 186646575 which is 0x6f80057 in hexdecimal, stands for an indirect call probe
;; with an index of 5 and probe factor of 1.0.
!12 = !DILexicalBlockFile(scope: !4, file: !5, discriminator: 186646575)
;; A discriminator of 186646559 which is 0xB20001F in hexdecimal, stands for an indirect call probe
;; with an index of 3 and probe factor of 1.0.
!12 = !DILexicalBlockFile(scope: !4, file: !5, discriminator: 186646559)
!13 = distinct !DILocation(line: 10, column: 11, scope: !12)
;; A discriminator of 134217775 which is 0x6f80057 in hexdecimal, stands for an indirect call probe
;; with an index of 5 and probe factor of 0.
!14 = !DILexicalBlockFile(scope: !4, file: !5, discriminator: 134217775)
;; A discriminator of 134217759 which is 0x800001F in hexdecimal, stands for an indirect call probe
;; with an index of 3 and probe factor of 0.
!14 = !DILexicalBlockFile(scope: !4, file: !5, discriminator: 134217759)
!15 = distinct !DILocation(line: 10, column: 11, scope: !14)
!16 = !{!"VP", i32 0, i64 7, i64 9191153033785521275, i64 5, i64 -1069303473483922844, i64 2}

22
llvm/test/Transforms/SampleProfile/pseudo-probe-profile.ll
View File

@ -22,12 +22,12 @@ if.then:
if.else:
; CHECK: call {{.*}}, !dbg ![[#PROBE2:]], !prof ![[PROF2:[0-9]+]]
call void %f(i32 2)
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 3, i32 0, i64 -1)
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 4, i32 0, i64 -1)
store i32 2, ptr %retval, align 4
br label %return
return:
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 4, i32 0, i64 -1)
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 6, i32 0, i64 -1)
%1 = load i32, ptr %retval, align 4
ret i32 %1
}
@ -36,14 +36,14 @@ attributes #0 = {"use-sample-profile"}
; CHECK: ![[PD1]] = !{!"branch_weights", i32 8, i32 7}
; CHECK: ![[#PROBE1]] = !DILocation(line: 0, scope: ![[#SCOPE1:]])
;; A discriminator of 119537695 which is 0x720001f in hexdecimal, stands for an indirect call probe
;; with an index of 3.
; CHECK: ![[#SCOPE1]] = !DILexicalBlockFile(scope: ![[#]], file: ![[#]], discriminator: 119537695)
; CHECK: ![[PROF1]] = !{!"VP", i32 0, i64 7, i64 9191153033785521275, i64 5, i64 -1069303473483922844, i64 2}
;; A discriminator of 119537711 which is 0x720002f in hexdecimal, stands for an indirect call probe
;; with an index of 5.
; CHECK: ![[#SCOPE1]] = !DILexicalBlockFile(scope: ![[#]], file: ![[#]], discriminator: 119537711)
; CHECK: ![[PROF1]] = !{!"VP", i32 0, i64 7, i64 9191153033785521275, i64 5, i64 -1069303473483922844, i64 2}
;; A discriminator of 119537719 which is 0x7200037 in hexdecimal, stands for an indirect call probe
;; with an index of 6.
; CHECK: ![[#PROBE2]] = !DILocation(line: 0, scope: ![[#SCOPE2:]])
; CHECK: ![[#SCOPE2]] = !DILexicalBlockFile(scope: ![[#]], file: ![[#]], discriminator: 119537719)
; CHECK: ![[#SCOPE2]] = !DILexicalBlockFile(scope: ![[#]], file: ![[#]], discriminator: 119537711)
; CHECK: ![[PROF2]] = !{!"VP", i32 0, i64 6, i64 -1069303473483922844, i64 4, i64 9191153033785521275, i64 2}
!llvm.module.flags = !{!9, !10}
@ -83,7 +83,7 @@ attributes #0 = {"use-sample-profile"}
;YAML-NEXT: - String: 'Applied '
;YAML-NEXT: - NumSamples: '7'
;YAML-NEXT: - String: ' samples from profile (ProbeId='
;YAML-NEXT: - ProbeId: '5'
;YAML-NEXT: - ProbeId: '3'
;YAML-NEXT: - String: ', Factor='
;YAML-NEXT: - Factor: '1.000000e+00'
;YAML-NEXT: - String: ', OriginalSamples='
@ -113,7 +113,7 @@ attributes #0 = {"use-sample-profile"}
;YAML-NEXT: - String: 'Applied '
;YAML-NEXT: - NumSamples: '6'
;YAML-NEXT: - String: ' samples from profile (ProbeId='
;YAML-NEXT: - ProbeId: '6'
;YAML-NEXT: - ProbeId: '5'
;YAML-NEXT: - String: ', Factor='
;YAML-NEXT: - Factor: '1.000000e+00'
;YAML-NEXT: - String: ', OriginalSamples='
@ -128,7 +128,7 @@ attributes #0 = {"use-sample-profile"}
;YAML-NEXT: - String: 'Applied '
;YAML-NEXT: - NumSamples: '6'
;YAML-NEXT: - String: ' samples from profile (ProbeId='
;YAML-NEXT: - ProbeId: '3'
;YAML-NEXT: - ProbeId: '4'
;YAML-NEXT: - String: ', Factor='
;YAML-NEXT: - Factor: '1.000000e+00'
;YAML-NEXT: - String: ', OriginalSamples='
@ -143,7 +143,7 @@ attributes #0 = {"use-sample-profile"}
;YAML-NEXT: - String: 'Applied '
;YAML-NEXT: - NumSamples: '13'
;YAML-NEXT: - String: ' samples from profile (ProbeId='
;YAML-NEXT: - ProbeId: '4'
;YAML-NEXT: - ProbeId: '6'
;YAML-NEXT: - String: ', Factor='
;YAML-NEXT: - Factor: '1.000000e+00'
;YAML-NEXT: - String: ', OriginalSamples='

11
llvm/test/Transforms/SampleProfile/pseudo-probe-update.ll
View File

@ -14,15 +14,15 @@ T1:
%v1 = call i32 @f1()
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 2, i32 0, i64 -1)
;; The distribution factor -8513881372706734080 stands for 53.85%, whic is from 7/6+7.
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 4, i32 0, i64 -8513881372706734080)
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 6, i32 0, i64 -8513881372706734080)
%cond3 = icmp eq i32 %v1, 412
br label %Merge
F1:
; CHECK: %v2 = call i32 @f2(), !prof ![[#PROF2:]]
%v2 = call i32 @f2()
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 3, i32 0, i64 -1)
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 4, i32 0, i64 -1)
;; The distribution factor 8513881922462547968 stands for 46.25%, which is from 6/6+7.
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 4, i32 0, i64 8513881922462547968)
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 6, i32 0, i64 8513881922462547968)
br label %Merge
Merge:
@ -30,11 +30,11 @@ Merge:
%B = phi i32 [%v1, %T1], [%v2, %F1]
br i1 %A, label %T2, label %F2
T2:
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 5, i32 0, i64 -1)
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 7, i32 0, i64 -1)
call void @f3()
ret i32 %B
F2:
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 6, i32 0, i64 -1)
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 9, i32 0, i64 -1)
ret i32 %B
}
@ -42,4 +42,3 @@ F2:
; CHECK: ![[#PROF2]] = !{!"branch_weights", i32 6}
attributes #0 = {"use-sample-profile"}

16
llvm/test/Transforms/SampleProfile/pseudo-probe-verify.ll
View File

@ -4,7 +4,7 @@
; VERIFY: *** Pseudo Probe Verification After LoopFullUnrollPass ***
; VERIFY: Function foo:
; VERIFY-DAG: Probe 6 previous factor 1.00 current factor 5.00
; VERIFY-DAG: Probe 5 previous factor 1.00 current factor 5.00
; VERIFY-DAG: Probe 4 previous factor 1.00 current factor 5.00
declare void @foo2() nounwind
@ -27,15 +27,15 @@ bb7.preheader:
bb10:
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 4, i32 0, i64 -1)
; CHECK: call void @foo2(), !dbg ![[#PROBE6:]]
; CHECK: call void @foo2(), !dbg ![[#PROBE6:]]
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 4, i32 0, i64 -1)
; CHECK: call void @foo2(), !dbg ![[#PROBE6:]]
; CHECK: call void @foo2(), !dbg ![[#PROBE6:]]
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 4, i32 0, i64 -1)
; CHECK: call void @foo2(), !dbg ![[#PROBE6:]]
; CHECK: call void @foo2(), !dbg ![[#PROBE6:]]
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 4, i32 0, i64 -1)
; CHECK: call void @foo2(), !dbg ![[#PROBE6:]]
; CHECK: call void @foo2(), !dbg ![[#PROBE6:]]
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 4, i32 0, i64 -1)
; CHECK: call void @foo2(), !dbg ![[#PROBE6:]]
; CHECK: call void @foo2(), !dbg ![[#PROBE6:]]
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 2, i32 0, i64 -1)
%indvars.iv = phi i64 [ 0, %bb7.preheader ], [ %indvars.iv.next, %bb10 ]
%tmp1.14 = phi i32 [ %tmp1.06, %bb7.preheader ], [ %spec.select, %bb10 ]
@ -50,14 +50,14 @@ bb10:
br i1 %exitcond.not, label %bb3.loopexit, label %bb10, !llvm.loop !13
bb24:
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 5, i32 0, i64 -1)
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 6, i32 0, i64 -1)
ret void
}
;; A discriminator of 186646583 which is 0xb200037 in hexdecimal, stands for a direct call probe
;; with an index of 6 and a scale of -1%.
; CHECK: ![[#PROBE6]] = !DILocation(line: 2, column: 20, scope: ![[#SCOPE:]])
; CHECK: ![[#SCOPE]] = !DILexicalBlockFile(scope: ![[#]], file: ![[#]], discriminator: 186646583)
; CHECK: ![[#SCOPE]] = !DILexicalBlockFile(scope: ![[#]], file: ![[#]], discriminator: 186646575)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!9, !10}