; LLVM IR from stan-dev/math :: lib/boost_1.84.0/libs/timer/src/cpu_timer.ll (ZN5boost5timer9cpu_timer6resumeEv)

; Unoptimized IR (clang -disable-llvm-passes):
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"

%"struct.boost::timer::cpu_times" = type { i64, i64, i64 }
%"class.boost::timer::cpu_timer" = type <{ %"struct.boost::timer::cpu_times", i8, [7 x i8] }>

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN5boost5timer9cpu_timer5startEv(ptr noundef nonnull align 8 dereferenceable(25)) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNK5boost5timer9cpu_timer10is_stoppedEv(ptr noundef nonnull align 8 dereferenceable(25)) #1 align 2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN5boost5timer9cpu_timer6resumeEv(ptr noundef nonnull align 8 dereferenceable(25) %0) #1 align 2 {
  %2 = alloca ptr, align 8
  %3 = alloca %"struct.boost::timer::cpu_times", align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %4 = load ptr, ptr %2, align 8
  %5 = call noundef zeroext i1 @_ZNK5boost5timer9cpu_timer10is_stoppedEv(ptr noundef nonnull align 8 dereferenceable(25) %4) #3
  br i1 %5, label %6, label %26

6:                                                ; preds = %1
  call void @llvm.lifetime.start.p0(i64 24, ptr %3) #3
  %7 = getelementptr inbounds %"class.boost::timer::cpu_timer", ptr %4, i32 0, i32 0
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %3, ptr align 8 %7, i64 24, i1 false), !tbaa.struct !9
  call void @_ZN5boost5timer9cpu_timer5startEv(ptr noundef nonnull align 8 dereferenceable(25) %4) #3
  %8 = getelementptr inbounds %"struct.boost::timer::cpu_times", ptr %3, i32 0, i32 0
  %9 = load i64, ptr %8, align 8, !tbaa !12
  %10 = getelementptr inbounds %"class.boost::timer::cpu_timer", ptr %4, i32 0, i32 0
  %11 = getelementptr inbounds %"struct.boost::timer::cpu_times", ptr %10, i32 0, i32 0
  %12 = load i64, ptr %11, align 8, !tbaa !14
  %13 = sub nsw i64 %12, %9
  store i64 %13, ptr %11, align 8, !tbaa !14
  %14 = getelementptr inbounds %"struct.boost::timer::cpu_times", ptr %3, i32 0, i32 1
  %15 = load i64, ptr %14, align 8, !tbaa !17
  %16 = getelementptr inbounds %"class.boost::timer::cpu_timer", ptr %4, i32 0, i32 0
  %17 = getelementptr inbounds %"struct.boost::timer::cpu_times", ptr %16, i32 0, i32 1
  %18 = load i64, ptr %17, align 8, !tbaa !18
  %19 = sub nsw i64 %18, %15
  store i64 %19, ptr %17, align 8, !tbaa !18
  %20 = getelementptr inbounds %"struct.boost::timer::cpu_times", ptr %3, i32 0, i32 2
  %21 = load i64, ptr %20, align 8, !tbaa !19
  %22 = getelementptr inbounds %"class.boost::timer::cpu_timer", ptr %4, i32 0, i32 0
  %23 = getelementptr inbounds %"struct.boost::timer::cpu_times", ptr %22, i32 0, i32 2
  %24 = load i64, ptr %23, align 8, !tbaa !20
  %25 = sub nsw i64 %24, %21
  store i64 %25, ptr %23, align 8, !tbaa !20
  call void @llvm.lifetime.end.p0(i64 24, ptr %3) #3
  br label %26

26:                                               ; preds = %6, %1
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #2 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{i64 0, i64 8, !10, i64 8, i64 8, !10, i64 16, i64 8, !10}
!10 = !{!11, !11, i64 0}
!11 = !{!"long", !7, i64 0}
!12 = !{!13, !11, i64 0}
!13 = !{!"_ZTSN5boost5timer9cpu_timesE", !11, i64 0, !11, i64 8, !11, i64 16}
!14 = !{!15, !11, i64 0}
!15 = !{!"_ZTSN5boost5timer9cpu_timerE", !13, i64 0, !16, i64 24}
!16 = !{!"bool", !7, i64 0}
!17 = !{!13, !11, i64 8}
!18 = !{!15, !11, i64 8}
!19 = !{!13, !11, i64 16}
!20 = !{!15, !11, i64 16}


; Optimized IR (opt -passes='default<O3>'):
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"

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN5boost5timer9cpu_timer5startEv(ptr noundef nonnull align 8 dereferenceable(25)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNK5boost5timer9cpu_timer10is_stoppedEv(ptr noundef nonnull align 8 dereferenceable(25)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN5boost5timer9cpu_timer6resumeEv(ptr noundef nonnull align 8 dereferenceable(25) %0) local_unnamed_addr #0 align 2 {
  %2 = tail call noundef zeroext i1 @_ZNK5boost5timer9cpu_timer10is_stoppedEv(ptr noundef nonnull align 8 dereferenceable(25) %0) #1
  br i1 %2, label %3, label %9

3:                                                ; preds = %1
  %.sroa.5.0..sroa_idx = getelementptr inbounds i8, ptr %0, i64 16
  %.sroa.5.0.copyload = load i64, ptr %.sroa.5.0..sroa_idx, align 8, !tbaa !5
  %4 = load <2 x i64>, ptr %0, align 8, !tbaa !5
  tail call void @_ZN5boost5timer9cpu_timer5startEv(ptr noundef nonnull align 8 dereferenceable(25) %0) #1
  %5 = load <2 x i64>, ptr %0, align 8, !tbaa !5
  %6 = sub nsw <2 x i64> %5, %4
  store <2 x i64> %6, ptr %0, align 8, !tbaa !5
  %7 = load i64, ptr %.sroa.5.0..sroa_idx, align 8, !tbaa !9
  %8 = sub nsw i64 %7, %.sroa.5.0.copyload
  store i64 %8, ptr %.sroa.5.0..sroa_idx, align 8, !tbaa !9
  br label %9

9:                                                ; preds = %3, %1
  ret void
}

attributes #0 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !6, i64 16}
!10 = !{!"_ZTSN5boost5timer9cpu_timerE", !11, i64 0, !12, i64 24}
!11 = !{!"_ZTSN5boost5timer9cpu_timesE", !6, i64 0, !6, i64 8, !6, i64 16}
!12 = !{!"bool", !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,SLPVectorizerPass,SROAPass,TailCallElimPass