; LLVM IR from VAR-solutions/Algorithms :: LinkedList/C (linkedList)

; 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

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

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 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 @posins(i32 noundef %0, i32 noundef %1) #2 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %9 = call noalias ptr @malloc(i64 noundef 16) #4
  store ptr %9, ptr %5, align 8, !tbaa !9
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = load ptr, ptr %5, align 8, !tbaa !9
  %12 = getelementptr inbounds %struct.node, ptr %11, i32 0, i32 0
  store i32 %10, ptr %12, align 8, !tbaa !11
  %13 = load ptr, ptr @head, align 8, !tbaa !9
  %14 = icmp eq ptr %13, null
  br i1 %14, label %15, label %19

15:                                               ; preds = %2
  %16 = load ptr, ptr %5, align 8, !tbaa !9
  store ptr %16, ptr @head, align 8, !tbaa !9
  %17 = load ptr, ptr @head, align 8, !tbaa !9
  %18 = getelementptr inbounds %struct.node, ptr %17, i32 0, i32 1
  store ptr null, ptr %18, align 8, !tbaa !13
  store i32 1, ptr %7, align 4
  br label %47

19:                                               ; preds = %2
  %20 = load ptr, ptr @head, align 8, !tbaa !9
  store ptr %20, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  store i32 0, ptr %8, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %32, %19
  %22 = load i32, ptr %8, align 4, !tbaa !5
  %23 = load i32, ptr %4, align 4, !tbaa !5
  %24 = icmp ne i32 %22, %23
  br i1 %24, label %25, label %30

25:                                               ; preds = %21
  %26 = load ptr, ptr %6, align 8, !tbaa !9
  %27 = getelementptr inbounds %struct.node, ptr %26, i32 0, i32 1
  %28 = load ptr, ptr %27, align 8, !tbaa !13
  %29 = icmp ne ptr %28, null
  br label %30

30:                                               ; preds = %25, %21
  %31 = phi i1 [ false, %21 ], [ %29, %25 ]
  br i1 %31, label %32, label %38

32:                                               ; preds = %30
  %33 = load ptr, ptr %6, align 8, !tbaa !9
  %34 = getelementptr inbounds %struct.node, ptr %33, i32 0, i32 1
  %35 = load ptr, ptr %34, align 8, !tbaa !13
  store ptr %35, ptr %6, align 8, !tbaa !9
  %36 = load i32, ptr %8, align 4, !tbaa !5
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %8, align 4, !tbaa !5
  br label %21, !llvm.loop !14

38:                                               ; preds = %30
  %39 = load ptr, ptr %6, align 8, !tbaa !9
  %40 = getelementptr inbounds %struct.node, ptr %39, i32 0, i32 1
  %41 = load ptr, ptr %40, align 8, !tbaa !13
  %42 = load ptr, ptr %5, align 8, !tbaa !9
  %43 = getelementptr inbounds %struct.node, ptr %42, i32 0, i32 1
  store ptr %41, ptr %43, align 8, !tbaa !13
  %44 = load ptr, ptr %5, align 8, !tbaa !9
  %45 = load ptr, ptr %6, align 8, !tbaa !9
  %46 = getelementptr inbounds %struct.node, ptr %45, i32 0, i32 1
  store ptr %44, ptr %46, align 8, !tbaa !13
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  store i32 0, ptr %7, align 4
  br label %47

47:                                               ; preds = %38, %15
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  %48 = load i32, ptr %7, align 4
  switch i32 %48, label %50 [
    i32 0, label %49
    i32 1, label %49
  ]

49:                                               ; preds = %47, %47
  ret void

50:                                               ; preds = %47
  unreachable
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 }
attributes #4 = { 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 = !{!"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"

@head = external dso_local local_unnamed_addr global ptr, align 8

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

; Function Attrs: nofree nounwind uwtable
define dso_local void @posins(i32 noundef %0, i32 noundef %1) local_unnamed_addr #1 {
  %3 = tail call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #2
  store i32 %0, ptr %3, align 8, !tbaa !5
  %4 = load ptr, ptr @head, align 8, !tbaa !11
  %5 = icmp eq ptr %4, null
  br i1 %5, label %6, label %.preheader

.preheader:                                       ; preds = %2
  %.not15 = icmp eq i32 %1, 0
  br i1 %.not15, label %.critedge, label %.lr.ph

6:                                                ; preds = %2
  store ptr %3, ptr @head, align 8, !tbaa !11
  %7 = getelementptr inbounds i8, ptr %3, i64 8
  store ptr null, ptr %7, align 8, !tbaa !12
  br label %15

8:                                                ; preds = %.lr.ph
  %9 = add nuw nsw i32 %.017, 1
  %.not = icmp eq i32 %9, %1
  br i1 %.not, label %.critedge, label %.lr.ph, !llvm.loop !13

.lr.ph:                                           ; preds = %.preheader, %8
  %.017 = phi i32 [ %9, %8 ], [ 0, %.preheader ]
  %.01116 = phi ptr [ %11, %8 ], [ %4, %.preheader ]
  %10 = getelementptr inbounds i8, ptr %.01116, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !12
  %.not14 = icmp eq ptr %11, null
  br i1 %.not14, label %.critedge, label %8

.critedge:                                        ; preds = %.lr.ph, %8, %.preheader
  %.011.lcssa = phi ptr [ %4, %.preheader ], [ %11, %8 ], [ %.01116, %.lr.ph ]
  %12 = getelementptr inbounds i8, ptr %.011.lcssa, i64 8
  %13 = load ptr, ptr %12, align 8, !tbaa !12
  %14 = getelementptr inbounds i8, ptr %3, i64 8
  store ptr %13, ptr %14, align 8, !tbaa !12
  store ptr %3, ptr %12, align 8, !tbaa !12
  br label %15

15:                                               ; preds = %.critedge, %6
  ret void
}

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


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