; LLVM IR from JessonYue/LeetCodeLearning :: Array/caiweixiong/c (homework_007)

; 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: nounwind uwtable
define dso_local ptr @mergeTwoLists_4(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %6 = load ptr, ptr %4, align 8, !tbaa !5
  %7 = icmp ne ptr %6, null
  br i1 %7, label %8, label %11

8:                                                ; preds = %2
  %9 = load ptr, ptr %5, align 8, !tbaa !5
  %10 = icmp ne ptr %9, null
  br i1 %10, label %20, label %11

11:                                               ; preds = %8, %2
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = icmp ne ptr %12, null
  br i1 %13, label %14, label %16

14:                                               ; preds = %11
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  br label %18

16:                                               ; preds = %11
  %17 = load ptr, ptr %5, align 8, !tbaa !5
  br label %18

18:                                               ; preds = %16, %14
  %19 = phi ptr [ %15, %14 ], [ %17, %16 ]
  store ptr %19, ptr %3, align 8
  br label %46

20:                                               ; preds = %8
  %21 = load ptr, ptr %4, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.ListNode, ptr %21, i32 0, i32 0
  %23 = load i32, ptr %22, align 8, !tbaa !9
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.ListNode, ptr %24, i32 0, i32 0
  %26 = load i32, ptr %25, align 8, !tbaa !9
  %27 = icmp slt i32 %23, %26
  br i1 %27, label %28, label %37

28:                                               ; preds = %20
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.ListNode, ptr %29, i32 0, i32 1
  %31 = load ptr, ptr %30, align 8, !tbaa !12
  %32 = load ptr, ptr %5, align 8, !tbaa !5
  %33 = call ptr @mergeTwoLists_4(ptr noundef %31, ptr noundef %32)
  %34 = load ptr, ptr %4, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.ListNode, ptr %34, i32 0, i32 1
  store ptr %33, ptr %35, align 8, !tbaa !12
  %36 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %36, ptr %3, align 8
  br label %46

37:                                               ; preds = %20
  %38 = load ptr, ptr %4, align 8, !tbaa !5
  %39 = load ptr, ptr %5, align 8, !tbaa !5
  %40 = getelementptr inbounds %struct.ListNode, ptr %39, i32 0, i32 1
  %41 = load ptr, ptr %40, align 8, !tbaa !12
  %42 = call ptr @mergeTwoLists_4(ptr noundef %38, ptr noundef %41)
  %43 = load ptr, ptr %5, align 8, !tbaa !5
  %44 = getelementptr inbounds %struct.ListNode, ptr %43, i32 0, i32 1
  store ptr %42, ptr %44, align 8, !tbaa !12
  %45 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %45, ptr %3, align 8
  br label %46

46:                                               ; preds = %37, %28, %18
  %47 = load ptr, ptr %3, align 8
  ret ptr %47
}

attributes #0 = { 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" }

!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, !11, i64 0}
!10 = !{!"ListNode", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 8}


; 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: nofree nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local noundef ptr @mergeTwoLists_4(ptr noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = icmp ne ptr %0, null
  %4 = icmp ne ptr %1, null
  %or.cond = and i1 %3, %4
  br i1 %or.cond, label %6, label %common.ret

common.ret:                                       ; preds = %2
  %5 = select i1 %3, ptr %0, ptr %1
  br label %common.ret19

6:                                                ; preds = %2
  %7 = load i32, ptr %0, align 8, !tbaa !5
  %8 = load i32, ptr %1, align 8, !tbaa !5
  %9 = icmp slt i32 %7, %8
  br i1 %9, label %10, label %14

common.ret19:                                     ; preds = %14, %10, %common.ret
  %common.ret19.op = phi ptr [ %5, %common.ret ], [ %0, %10 ], [ %1, %14 ]
  ret ptr %common.ret19.op

10:                                               ; preds = %6
  %11 = getelementptr inbounds i8, ptr %0, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !11
  %13 = tail call ptr @mergeTwoLists_4(ptr noundef %12, ptr noundef nonnull %1)
  store ptr %13, ptr %11, align 8, !tbaa !11
  br label %common.ret19

14:                                               ; preds = %6
  %15 = getelementptr inbounds i8, ptr %1, i64 8
  %16 = load ptr, ptr %15, align 8, !tbaa !11
  %17 = tail call ptr @mergeTwoLists_4(ptr noundef nonnull %0, ptr noundef %16)
  store ptr %17, ptr %15, align 8, !tbaa !11
  br label %common.ret19
}

attributes #0 = { nofree nosync nounwind memory(readwrite, inaccessiblemem: none) 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" }

!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}


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