; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 10. Linked List/c lang (all_func)

; 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 }

@head = external dso_local global ptr, align 8
@.str.2 = external hidden unnamed_addr constant [3 x i8], align 1
@temp = external dso_local global ptr, align 8
@.str.15 = external hidden unnamed_addr constant [33 x i8], align 1
@.str.16 = external hidden unnamed_addr constant [22 x i8], align 1
@.str.17 = external hidden unnamed_addr constant [26 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: nounwind uwtable
define dso_local void @search_value() #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = load ptr, ptr @head, align 8, !tbaa !5
  store ptr %3, ptr @temp, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  store i32 0, ptr %2, align 4, !tbaa !9
  %4 = call i32 (ptr, ...) @printf(ptr noundef @.str.15)
  %5 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.2, ptr noundef %1)
  br label %6

6:                                                ; preds = %18, %0
  %7 = load ptr, ptr @temp, align 8, !tbaa !5
  %8 = icmp ne ptr %7, null
  br i1 %8, label %9, label %22

9:                                                ; preds = %6
  %10 = load ptr, ptr @temp, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.node, ptr %10, i32 0, i32 0
  %12 = load i32, ptr %11, align 8, !tbaa !11
  %13 = load i32, ptr %1, align 4, !tbaa !9
  %14 = icmp eq i32 %12, %13
  br i1 %14, label %15, label %17

15:                                               ; preds = %9
  %16 = call i32 (ptr, ...) @printf(ptr noundef @.str.16)
  store i32 1, ptr %2, align 4, !tbaa !9
  br label %22

17:                                               ; preds = %9
  store i32 0, ptr %2, align 4, !tbaa !9
  br label %18

18:                                               ; preds = %17
  %19 = load ptr, ptr @temp, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.node, ptr %19, i32 0, i32 1
  %21 = load ptr, ptr %20, align 8, !tbaa !13
  store ptr %21, ptr @temp, align 8, !tbaa !5
  br label %6, !llvm.loop !14

22:                                               ; preds = %15, %6
  %23 = load i32, ptr %2, align 4, !tbaa !9
  %24 = icmp eq i32 %23, 0
  br i1 %24, label %25, label %27

25:                                               ; preds = %22
  %26 = call i32 (ptr, ...) @printf(ptr noundef @.str.17)
  br label %27

27:                                               ; preds = %25, %22
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  ret void
}

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

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 = !{!"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 = !{!12, !6, 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"

@head = external dso_local local_unnamed_addr global ptr, align 8
@.str.2 = external hidden unnamed_addr constant [3 x i8], align 1
@temp = external dso_local local_unnamed_addr global ptr, align 8
@.str.15 = external hidden unnamed_addr constant [33 x i8], align 1
@.str.16 = external hidden unnamed_addr constant [22 x i8], align 1
@.str.17 = external hidden unnamed_addr constant [26 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: nofree nounwind uwtable
define dso_local void @search_value() local_unnamed_addr #2 {
  %1 = alloca i32, align 4
  %2 = load ptr, ptr @head, align 8, !tbaa !5
  store ptr %2, ptr @temp, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #3
  %3 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.15)
  %4 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.2, ptr noundef nonnull %1)
  %.pr = load ptr, ptr @temp, align 8, !tbaa !5
  %.not1 = icmp eq ptr %.pr, null
  br i1 %.not1, label %.critedge, label %.lr.ph

.lr.ph:                                           ; preds = %0
  %5 = load i32, ptr %1, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %.lr.ph, %10
  %7 = phi ptr [ %.pr, %.lr.ph ], [ %12, %10 ]
  %8 = load i32, ptr %7, align 8, !tbaa !11
  %9 = icmp eq i32 %8, %5
  br i1 %9, label %.critedge, label %10

10:                                               ; preds = %6
  %11 = getelementptr inbounds i8, ptr %7, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !13
  store ptr %12, ptr @temp, align 8, !tbaa !5
  %.not = icmp eq ptr %12, null
  br i1 %.not, label %.critedge, label %6, !llvm.loop !14

.critedge:                                        ; preds = %10, %6, %0
  %.str.16.sink = phi ptr [ @.str.17, %0 ], [ @.str.16, %6 ], [ @.str.17, %10 ]
  %13 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) %.str.16.sink)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #3
  ret void
}

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

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 = !{!12, !6, i64 8}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


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