; LLVM IR from TheAlgorithms/C-Plus-Plus :: search/sublist_search.ll (ZN6search14sublist_search13sublistSearchEPNS0_4NodeES2_)

; 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.search::sublist_search::Node" = type { i32, ptr }

; 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
define dso_local noundef zeroext i1 @_ZN6search14sublist_search13sublistSearchEPNS0_4NodeES2_(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca i1, align 1
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = icmp eq ptr %9, null
  br i1 %10, label %14, label %11

11:                                               ; preds = %2
  %12 = load ptr, ptr %5, align 8, !tbaa !5
  %13 = icmp eq ptr %12, null
  br i1 %13, label %14, label %15

14:                                               ; preds = %11, %2
  store i1 false, ptr %3, align 1
  br label %61

15:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %16, ptr %6, align 8, !tbaa !5
  br label %17

17:                                               ; preds = %58, %15
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  %19 = icmp ne ptr %18, null
  br i1 %19, label %20, label %59

20:                                               ; preds = %17
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %21 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %21, ptr %7, align 8, !tbaa !5
  br label %22

22:                                               ; preds = %46, %20
  %23 = load ptr, ptr %6, align 8, !tbaa !5
  %24 = icmp ne ptr %23, null
  br i1 %24, label %25, label %47

25:                                               ; preds = %22
  %26 = load ptr, ptr %7, align 8, !tbaa !5
  %27 = icmp eq ptr %26, null
  br i1 %27, label %28, label %29

28:                                               ; preds = %25
  store i1 false, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %56

29:                                               ; preds = %25
  %30 = load ptr, ptr %7, align 8, !tbaa !5
  %31 = getelementptr inbounds %"struct.search::sublist_search::Node", ptr %30, i32 0, i32 0
  %32 = load i32, ptr %31, align 8, !tbaa !9
  %33 = load ptr, ptr %6, align 8, !tbaa !5
  %34 = getelementptr inbounds %"struct.search::sublist_search::Node", ptr %33, i32 0, i32 0
  %35 = load i32, ptr %34, align 8, !tbaa !9
  %36 = icmp eq i32 %32, %35
  br i1 %36, label %37, label %44

37:                                               ; preds = %29
  %38 = load ptr, ptr %6, align 8, !tbaa !5
  %39 = getelementptr inbounds %"struct.search::sublist_search::Node", ptr %38, i32 0, i32 1
  %40 = load ptr, ptr %39, align 8, !tbaa !12
  store ptr %40, ptr %6, align 8, !tbaa !5
  %41 = load ptr, ptr %7, align 8, !tbaa !5
  %42 = getelementptr inbounds %"struct.search::sublist_search::Node", ptr %41, i32 0, i32 1
  %43 = load ptr, ptr %42, align 8, !tbaa !12
  store ptr %43, ptr %7, align 8, !tbaa !5
  br label %45

44:                                               ; preds = %29
  br label %47

45:                                               ; preds = %37
  br label %46

46:                                               ; preds = %45
  br label %22, !llvm.loop !13

47:                                               ; preds = %44, %22
  %48 = load ptr, ptr %6, align 8, !tbaa !5
  %49 = icmp eq ptr %48, null
  br i1 %49, label %50, label %51

50:                                               ; preds = %47
  store i1 true, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %56

51:                                               ; preds = %47
  %52 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %52, ptr %6, align 8, !tbaa !5
  %53 = load ptr, ptr %5, align 8, !tbaa !5
  %54 = getelementptr inbounds %"struct.search::sublist_search::Node", ptr %53, i32 0, i32 1
  %55 = load ptr, ptr %54, align 8, !tbaa !12
  store ptr %55, ptr %5, align 8, !tbaa !5
  store i32 0, ptr %8, align 4
  br label %56

56:                                               ; preds = %51, %50, %28
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  %57 = load i32, ptr %8, align 4
  switch i32 %57, label %60 [
    i32 0, label %58
  ]

58:                                               ; preds = %56
  br label %17, !llvm.loop !15

59:                                               ; preds = %17
  store i1 false, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %60

60:                                               ; preds = %59, %56
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %61

61:                                               ; preds = %60, %14
  %62 = load i1, ptr %3, align 1
  ret i1 %62
}

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 = { 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 = !{!10, !11, i64 0}
!10 = !{!"_ZTSN6search14sublist_search4NodeE", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = distinct !{!15, !14}


; 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 nofree norecurse nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef zeroext i1 @_ZN6search14sublist_search13sublistSearchEPNS0_4NodeES2_(ptr noundef readonly %0, ptr noundef readonly %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %0, null
  %4 = icmp eq ptr %1, null
  %or.cond = or i1 %3, %4
  br i1 %or.cond, label %.thread, label %.preheader

.preheader:                                       ; preds = %2, %15
  %.01839 = phi ptr [ %17, %15 ], [ %1, %2 ]
  br label %5

5:                                                ; preds = %.preheader, %10
  %.01635 = phi ptr [ %.01839, %.preheader ], [ %14, %10 ]
  %.134 = phi ptr [ %0, %.preheader ], [ %12, %10 ]
  %.not42 = icmp ne ptr %.01635, null
  br i1 %.not42, label %6, label %.thread

6:                                                ; preds = %5
  %7 = load i32, ptr %.01635, align 8, !tbaa !5
  %8 = load i32, ptr %.134, align 8, !tbaa !5
  %9 = icmp eq i32 %7, %8
  br i1 %9, label %10, label %15

10:                                               ; preds = %6
  %11 = getelementptr inbounds i8, ptr %.134, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !11
  %13 = getelementptr inbounds i8, ptr %.01635, i64 8
  %14 = load ptr, ptr %13, align 8, !tbaa !11
  %cond26 = icmp eq ptr %12, null
  br i1 %cond26, label %.thread, label %5, !llvm.loop !12

15:                                               ; preds = %6
  %16 = getelementptr inbounds i8, ptr %.01839, i64 8
  %17 = load ptr, ptr %16, align 8, !tbaa !11
  %.not = icmp eq ptr %17, null
  br i1 %.not, label %.thread, label %.preheader, !llvm.loop !14

.thread:                                          ; preds = %15, %5, %10, %2
  %.3 = phi i1 [ false, %2 ], [ %.not42, %10 ], [ %.not42, %5 ], [ false, %15 ]
  ret i1 %.3
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, inaccessiblemem: none) 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" }

!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, !7, i64 0}
!6 = !{!"_ZTSN6search14sublist_search4NodeE", !7, i64 0, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 8}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = distinct !{!14, !13}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyCFGPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass