; LLVM IR from HarshCasper/NeoAlgo :: C/ds (singly_linked_list)

; 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.node = type { i32, ptr }

@first = external dso_local global ptr, align 8
@.str.13 = external hidden unnamed_addr constant [3 x i8], align 1
@ptr = external dso_local global ptr, align 8
@.str.31 = external hidden unnamed_addr constant [13 x i8], align 1
@.str.38 = external hidden unnamed_addr constant [23 x i8], align 1
@.str.39 = external hidden unnamed_addr constant [27 x i8], align 1
@.str.40 = external hidden unnamed_addr constant [34 x i8], align 1
@.str.41 = external hidden unnamed_addr constant [31 x i8], align 1

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

declare i32 @printf(ptr noundef, ...) #1

declare i32 @__isoc99_scanf(ptr noundef, ...) #1

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

; Function Attrs: nounwind uwtable
define dso_local void @search() #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  store i32 0, ptr %1, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !5
  %4 = load ptr, ptr @first, align 8, !tbaa !9
  %5 = icmp eq ptr %4, null
  br i1 %5, label %6, label %9

6:                                                ; preds = %0
  %7 = call i32 (ptr, ...) @printf(ptr noundef @.str.31)
  %8 = call i32 (ptr, ...) @printf(ptr noundef @.str.38)
  br label %41

9:                                                ; preds = %0
  %10 = call i32 (ptr, ...) @printf(ptr noundef @.str.39)
  %11 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.13, ptr noundef %2)
  %12 = load ptr, ptr @first, align 8, !tbaa !9
  store ptr %12, ptr @ptr, align 8, !tbaa !9
  br label %13

13:                                               ; preds = %26, %9
  %14 = load ptr, ptr @ptr, align 8, !tbaa !9
  %15 = icmp ne ptr %14, null
  br i1 %15, label %16, label %30

16:                                               ; preds = %13
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = add nsw i32 %17, 1
  store i32 %18, ptr %3, align 4, !tbaa !5
  %19 = load ptr, ptr @ptr, align 8, !tbaa !9
  %20 = getelementptr inbounds %struct.node, ptr %19, i32 0, i32 0
  %21 = load i32, ptr %20, align 8, !tbaa !11
  %22 = load i32, ptr %2, align 4, !tbaa !5
  %23 = icmp eq i32 %21, %22
  br i1 %23, label %24, label %25

24:                                               ; preds = %16
  store i32 1, ptr %1, align 4, !tbaa !5
  br label %30

25:                                               ; preds = %16
  br label %26

26:                                               ; preds = %25
  %27 = load ptr, ptr @ptr, align 8, !tbaa !9
  %28 = getelementptr inbounds %struct.node, ptr %27, i32 0, i32 1
  %29 = load ptr, ptr %28, align 8, !tbaa !13
  store ptr %29, ptr @ptr, align 8, !tbaa !9
  br label %13, !llvm.loop !14

30:                                               ; preds = %24, %13
  %31 = load i32, ptr %1, align 4, !tbaa !5
  %32 = icmp eq i32 %31, 1
  br i1 %32, label %33, label %37

33:                                               ; preds = %30
  %34 = load i32, ptr %2, align 4, !tbaa !5
  %35 = load i32, ptr %3, align 4, !tbaa !5
  %36 = call i32 (ptr, ...) @printf(ptr noundef @.str.40, i32 noundef %34, i32 noundef %35)
  br label %40

37:                                               ; preds = %30
  %38 = load i32, ptr %2, align 4, !tbaa !5
  %39 = call i32 (ptr, ...) @printf(ptr noundef @.str.41, i32 noundef %38)
  br label %40

40:                                               ; preds = %37, %33
  br label %41

41:                                               ; preds = %40, %6
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { "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 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 #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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"node", !6, i64 0, !10, i64 8}
!13 = !{!12, !10, i64 8}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


; 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"

@first = external dso_local local_unnamed_addr global ptr, align 8
@.str.13 = external hidden unnamed_addr constant [3 x i8], align 1
@ptr = external dso_local local_unnamed_addr global ptr, align 8
@.str.31 = external hidden unnamed_addr constant [13 x i8], align 1
@.str.38 = external hidden unnamed_addr constant [23 x i8], align 1
@.str.39 = external hidden unnamed_addr constant [27 x i8], align 1
@.str.40 = external hidden unnamed_addr constant [34 x i8], align 1
@.str.41 = external hidden unnamed_addr constant [31 x i8], align 1

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

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

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

; Function Attrs: nofree nounwind uwtable
define dso_local void @search() local_unnamed_addr #2 {
  %1 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #3
  %2 = load ptr, ptr @first, align 8, !tbaa !5
  %3 = icmp eq ptr %2, null
  br i1 %3, label %4, label %7

4:                                                ; preds = %0
  %5 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.31)
  %6 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.38)
  br label %18

7:                                                ; preds = %0
  %8 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.39)
  %9 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.13, ptr noundef nonnull %1)
  %storemerge7 = load ptr, ptr @first, align 8, !tbaa !5
  %.not.not8 = icmp eq ptr %storemerge7, null
  %.pre = load i32, ptr %1, align 4, !tbaa !9
  br i1 %.not.not8, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %7, %13
  %storemerge10 = phi ptr [ %storemerge, %13 ], [ %storemerge7, %7 ]
  %.09 = phi i32 [ %10, %13 ], [ 0, %7 ]
  %10 = add nuw nsw i32 %.09, 1
  %11 = load i32, ptr %storemerge10, align 8, !tbaa !11
  %12 = icmp eq i32 %11, %.pre
  br i1 %12, label %15, label %13

13:                                               ; preds = %.lr.ph
  %14 = getelementptr inbounds i8, ptr %storemerge10, i64 8
  %storemerge = load ptr, ptr %14, align 8, !tbaa !5
  %.not.not = icmp eq ptr %storemerge, null
  br i1 %.not.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

15:                                               ; preds = %.lr.ph
  store ptr %storemerge10, ptr @ptr, align 8, !tbaa !5
  %16 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.40, i32 noundef %.pre, i32 noundef %10)
  br label %18

._crit_edge:                                      ; preds = %13, %7
  store ptr null, ptr @ptr, align 8, !tbaa !5
  %17 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.41, i32 noundef %.pre)
  br label %18

18:                                               ; preds = %15, %._crit_edge, %4
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #3
  ret void
}

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nofree nounwind "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 = { nofree 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 #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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"node", !10, i64 0, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


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