; LLVM IR from ImChong/Practice_LeetCode_C :: F01_Common_Functions/src (common_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.ListNode = 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: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local ptr @LinkedList_AddAtIndex(ptr noundef %0, i32 noundef %1, i32 noundef %2) #2 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca ptr, align 8
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %11 = call noalias ptr @malloc(i64 noundef 16) #4
  store ptr %11, ptr %8, align 8, !tbaa !5
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = load ptr, ptr %8, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.ListNode, ptr %13, i32 0, i32 0
  store i32 %12, ptr %14, align 8, !tbaa !11
  %15 = load ptr, ptr %8, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.ListNode, ptr %15, i32 0, i32 1
  store ptr null, ptr %16, align 8, !tbaa !13
  %17 = load ptr, ptr %5, align 8, !tbaa !5
  %18 = icmp eq ptr %17, null
  br i1 %18, label %19, label %21

19:                                               ; preds = %3
  %20 = load ptr, ptr %8, align 8, !tbaa !5
  store ptr %20, ptr %4, align 8
  store i32 1, ptr %9, align 4
  br label %41

21:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #3
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %22, ptr %10, align 8, !tbaa !5
  br label %23

23:                                               ; preds = %27, %21
  %24 = load i32, ptr %6, align 4, !tbaa !9
  %25 = add nsw i32 %24, -1
  store i32 %25, ptr %6, align 4, !tbaa !9
  %26 = icmp ne i32 %24, 0
  br i1 %26, label %27, label %31

27:                                               ; preds = %23
  %28 = load ptr, ptr %10, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.ListNode, ptr %28, i32 0, i32 1
  %30 = load ptr, ptr %29, align 8, !tbaa !13
  store ptr %30, ptr %10, align 8, !tbaa !5
  br label %23, !llvm.loop !14

31:                                               ; preds = %23
  %32 = load ptr, ptr %10, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.ListNode, ptr %32, i32 0, i32 1
  %34 = load ptr, ptr %33, align 8, !tbaa !13
  %35 = load ptr, ptr %8, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.ListNode, ptr %35, i32 0, i32 1
  store ptr %34, ptr %36, align 8, !tbaa !13
  %37 = load ptr, ptr %8, align 8, !tbaa !5
  %38 = load ptr, ptr %10, align 8, !tbaa !5
  %39 = getelementptr inbounds %struct.ListNode, ptr %38, i32 0, i32 1
  store ptr %37, ptr %39, align 8, !tbaa !13
  %40 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %40, ptr %4, align 8
  store i32 1, ptr %9, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #3
  br label %41

41:                                               ; preds = %31, %19
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  %42 = load ptr, ptr %4, align 8
  ret ptr %42
}

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 = !{!"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 = !{!"ListNode", !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"

; 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 noundef ptr @LinkedList_AddAtIndex(ptr noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #1 {
  %4 = tail call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #2
  store i32 %2, ptr %4, align 8, !tbaa !5
  %5 = getelementptr inbounds i8, ptr %4, i64 8
  store ptr null, ptr %5, align 8, !tbaa !11
  %6 = icmp eq ptr %0, null
  br i1 %6, label %30, label %.preheader

.preheader:                                       ; preds = %3
  %.not16 = icmp eq i32 %1, 0
  br i1 %.not16, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %.preheader
  %xtraiter = and i32 %1, 7
  %lcmp.mod.not = icmp eq i32 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol

.lr.ph.prol:                                      ; preds = %.lr.ph.preheader, %.lr.ph.prol
  %.018.prol = phi ptr [ %9, %.lr.ph.prol ], [ %0, %.lr.ph.preheader ]
  %.01417.prol = phi i32 [ %7, %.lr.ph.prol ], [ %1, %.lr.ph.preheader ]
  %prol.iter = phi i32 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader ]
  %7 = add nsw i32 %.01417.prol, -1
  %8 = getelementptr inbounds i8, ptr %.018.prol, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !11
  %prol.iter.next = add i32 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i32 %prol.iter.next, %xtraiter
  br i1 %prol.iter.cmp.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol, !llvm.loop !12

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader
  %.lcssa.unr = phi ptr [ poison, %.lr.ph.preheader ], [ %9, %.lr.ph.prol ]
  %.018.unr = phi ptr [ %0, %.lr.ph.preheader ], [ %9, %.lr.ph.prol ]
  %.01417.unr = phi i32 [ %1, %.lr.ph.preheader ], [ %7, %.lr.ph.prol ]
  %10 = icmp ult i32 %1, 8
  br i1 %10, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.018 = phi ptr [ %27, %.lr.ph ], [ %.018.unr, %.lr.ph.prol.loopexit ]
  %.01417 = phi i32 [ %25, %.lr.ph ], [ %.01417.unr, %.lr.ph.prol.loopexit ]
  %11 = getelementptr inbounds i8, ptr %.018, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !11
  %13 = getelementptr inbounds i8, ptr %12, i64 8
  %14 = load ptr, ptr %13, align 8, !tbaa !11
  %15 = getelementptr inbounds i8, ptr %14, i64 8
  %16 = load ptr, ptr %15, align 8, !tbaa !11
  %17 = getelementptr inbounds i8, ptr %16, i64 8
  %18 = load ptr, ptr %17, align 8, !tbaa !11
  %19 = getelementptr inbounds i8, ptr %18, i64 8
  %20 = load ptr, ptr %19, align 8, !tbaa !11
  %21 = getelementptr inbounds i8, ptr %20, i64 8
  %22 = load ptr, ptr %21, align 8, !tbaa !11
  %23 = getelementptr inbounds i8, ptr %22, i64 8
  %24 = load ptr, ptr %23, align 8, !tbaa !11
  %25 = add nsw i32 %.01417, -8
  %26 = getelementptr inbounds i8, ptr %24, i64 8
  %27 = load ptr, ptr %26, align 8, !tbaa !11
  %.not.7 = icmp eq i32 %25, 0
  br i1 %.not.7, label %._crit_edge, label %.lr.ph, !llvm.loop !14

._crit_edge:                                      ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %.preheader
  %.0.lcssa = phi ptr [ %0, %.preheader ], [ %.lcssa.unr, %.lr.ph.prol.loopexit ], [ %27, %.lr.ph ]
  %28 = getelementptr inbounds i8, ptr %.0.lcssa, i64 8
  %29 = load ptr, ptr %28, align 8, !tbaa !11
  store ptr %29, ptr %5, align 8, !tbaa !11
  store ptr %4, ptr %28, align 8, !tbaa !11
  br label %30

30:                                               ; preds = %3, %._crit_edge
  %.013 = phi ptr [ %0, %._crit_edge ], [ %4, %3 ]
  ret ptr %.013
}

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 = !{!"ListNode", !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 = !{!6, !10, i64 8}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.unroll.disable"}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


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