; 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.7 = external hidden unnamed_addr constant [16 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 @insert_end() #2 {
  %1 = alloca ptr, align 8
  %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 8, ptr %1) #4
  %3 = call noalias ptr @malloc(i64 noundef 16) #5
  store ptr %3, ptr %1, align 8, !tbaa !5
  %4 = call i32 (ptr, ...) @printf(ptr noundef @.str.7)
  %5 = load ptr, ptr %1, align 8, !tbaa !5
  %6 = getelementptr inbounds %struct.node, ptr %5, i32 0, i32 0
  %7 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.2, ptr noundef %6)
  %8 = load ptr, ptr %1, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.node, ptr %8, i32 0, i32 1
  store ptr null, ptr %9, align 8, !tbaa !9
  br label %10

10:                                               ; preds = %13, %0
  %11 = load ptr, ptr @temp, align 8, !tbaa !5
  %12 = icmp ne ptr %11, null
  br i1 %12, label %13, label %17

13:                                               ; preds = %10
  %14 = load ptr, ptr @temp, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.node, ptr %14, i32 0, i32 1
  %16 = load ptr, ptr %15, align 8, !tbaa !9
  store ptr %16, ptr @temp, align 8, !tbaa !5
  br label %10, !llvm.loop !12

17:                                               ; preds = %10
  %18 = load ptr, ptr %1, align 8, !tbaa !5
  %19 = load ptr, ptr @temp, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.node, ptr %19, i32 0, i32 1
  store ptr %18, ptr %20, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #4
  ret void
}

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

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #3

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 allocsize(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 #4 = { nounwind }
attributes #5 = { nounwind allocsize(0) }

!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, !6, i64 8}
!10 = !{!"node", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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.7 = external hidden unnamed_addr constant [16 x i8], align 1

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #0

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #0

; Function Attrs: nofree nounwind uwtable
define dso_local void @insert_end() local_unnamed_addr #1 {
  %1 = load ptr, ptr @head, align 8, !tbaa !5
  store ptr %1, ptr @temp, align 8, !tbaa !5
  %2 = tail call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #3
  %3 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.7)
  %4 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.2, ptr noundef %2)
  %5 = getelementptr inbounds i8, ptr %2, i64 8
  store ptr null, ptr %5, align 8, !tbaa !9
  %.pr = load ptr, ptr @temp, align 8, !tbaa !5
  %.not3 = icmp eq ptr %.pr, null
  br i1 %.not3, label %6, label %._crit_edge

._crit_edge:                                      ; preds = %0
  store ptr null, ptr @temp, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %._crit_edge, %0
  store ptr %2, ptr inttoptr (i64 8 to ptr), align 8, !tbaa !9
  ret void
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #2

attributes #0 = { 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 #1 = { 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 #2 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 allocsize(0) }

!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, !6, i64 8}
!10 = !{!"node", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}


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