; LLVM IR from JessonYue/LeetCodeLearning :: Array/caiweixiong/c (homework_011)

; 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 }
%struct.Queue = type { ptr, ptr }

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

; Function Attrs: nounwind uwtable
define dso_local void @myStackPush(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = icmp ne ptr %6, null
  br i1 %7, label %9, label %8

8:                                                ; preds = %2
  br label %41

9:                                                ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %10 = call noalias ptr @malloc(i64 noundef 16) #4
  store ptr %10, ptr %5, align 8, !tbaa !5
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.ListNode, ptr %11, i32 0, i32 1
  store ptr null, ptr %12, align 8, !tbaa !11
  %13 = load i32, ptr %4, align 4, !tbaa !9
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.ListNode, ptr %14, i32 0, i32 0
  store i32 %13, ptr %15, align 8, !tbaa !13
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.Queue, ptr %16, i32 0, i32 1
  %18 = load ptr, ptr %17, align 8, !tbaa !14
  %19 = icmp ne ptr %18, null
  br i1 %19, label %31, label %20

20:                                               ; preds = %9
  %21 = load ptr, ptr %3, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.Queue, ptr %21, i32 0, i32 0
  %23 = load ptr, ptr %22, align 8, !tbaa !16
  %24 = icmp ne ptr %23, null
  br i1 %24, label %31, label %25

25:                                               ; preds = %20
  %26 = load ptr, ptr %5, align 8, !tbaa !5
  %27 = load ptr, ptr %3, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.Queue, ptr %27, i32 0, i32 0
  store ptr %26, ptr %28, align 8, !tbaa !16
  %29 = load ptr, ptr %3, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.Queue, ptr %29, i32 0, i32 1
  store ptr %26, ptr %30, align 8, !tbaa !14
  br label %40

31:                                               ; preds = %20, %9
  %32 = load ptr, ptr %3, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.Queue, ptr %32, i32 0, i32 0
  %34 = load ptr, ptr %33, align 8, !tbaa !16
  %35 = load ptr, ptr %5, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.ListNode, ptr %35, i32 0, i32 1
  store ptr %34, ptr %36, align 8, !tbaa !11
  %37 = load ptr, ptr %5, align 8, !tbaa !5
  %38 = load ptr, ptr %3, align 8, !tbaa !5
  %39 = getelementptr inbounds %struct.Queue, ptr %38, i32 0, i32 0
  store ptr %37, ptr %39, align 8, !tbaa !16
  br label %40

40:                                               ; preds = %31, %25
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  br label %41

41:                                               ; preds = %40, %8
  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) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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) "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, !6, i64 8}
!12 = !{!"ListNode", !10, i64 0, !6, i64 8}
!13 = !{!12, !10, i64 0}
!14 = !{!15, !6, i64 8}
!15 = !{!"Queue", !6, i64 0, !6, i64 8}
!16 = !{!15, !6, i64 0}


; 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 memory(write, argmem: readwrite, inaccessiblemem: readwrite) uwtable
define dso_local void @myStackPush(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %10, label %3

3:                                                ; preds = %2
  %4 = tail call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #2
  %5 = getelementptr inbounds i8, ptr %4, i64 8
  store ptr null, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %4, align 8, !tbaa !11
  %6 = getelementptr inbounds i8, ptr %0, i64 8
  %7 = load ptr, ptr %6, align 8, !tbaa !12
  %.not12 = icmp eq ptr %7, null
  %.pre = load ptr, ptr %0, align 8, !tbaa !14
  %.not13 = icmp eq ptr %.pre, null
  %or.cond = select i1 %.not12, i1 %.not13, i1 false
  br i1 %or.cond, label %8, label %9

8:                                                ; preds = %3
  store ptr %4, ptr %0, align 8, !tbaa !14
  br label %.sink.split

9:                                                ; preds = %3
  store ptr %.pre, ptr %5, align 8, !tbaa !5
  br label %.sink.split

.sink.split:                                      ; preds = %9, %8
  %.sink = phi ptr [ %6, %8 ], [ %0, %9 ]
  store ptr %4, ptr %.sink, align 8, !tbaa !15
  br label %10

10:                                               ; preds = %.sink.split, %2
  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 #1

attributes #0 = { mustprogress nofree nounwind willreturn memory(write, argmem: readwrite, inaccessiblemem: readwrite) 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 #1 = { 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 #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, !10, i64 8}
!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, !7, i64 0}
!12 = !{!13, !10, i64 8}
!13 = !{!"Queue", !10, i64 0, !10, i64 8}
!14 = !{!13, !10, i64 0}
!15 = !{!10, !10, i64 0}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass