; LLVM IR from wuzhouhui/leetcode :: 100_same_tree (isSameTree)

; 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.TreeNode = type { i32, ptr, ptr }

; Function Attrs: nounwind uwtable
define dso_local i32 @isSameTree(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca i32, align 4
  %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 %12, label %8

8:                                                ; preds = %2
  %9 = load ptr, ptr %5, align 8, !tbaa !5
  %10 = icmp ne ptr %9, null
  br i1 %10, label %12, label %11

11:                                               ; preds = %8
  store i32 1, ptr %3, align 4
  br label %48

12:                                               ; preds = %8, %2
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = icmp ne ptr %13, null
  br i1 %14, label %15, label %18

15:                                               ; preds = %12
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = icmp ne ptr %16, null
  br i1 %17, label %19, label %18

18:                                               ; preds = %15, %12
  store i32 0, ptr %3, align 4
  br label %48

19:                                               ; preds = %15
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.TreeNode, ptr %20, i32 0, i32 0
  %22 = load i32, ptr %21, align 8, !tbaa !9
  %23 = load ptr, ptr %5, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.TreeNode, ptr %23, i32 0, i32 0
  %25 = load i32, ptr %24, align 8, !tbaa !9
  %26 = icmp ne i32 %22, %25
  br i1 %26, label %27, label %28

27:                                               ; preds = %19
  store i32 0, ptr %3, align 4
  br label %48

28:                                               ; preds = %19
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.TreeNode, 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 = getelementptr inbounds %struct.TreeNode, ptr %32, i32 0, i32 1
  %34 = load ptr, ptr %33, align 8, !tbaa !12
  %35 = call i32 @isSameTree(ptr noundef %31, ptr noundef %34)
  %36 = icmp ne i32 %35, 0
  br i1 %36, label %37, label %46

37:                                               ; preds = %28
  %38 = load ptr, ptr %4, align 8, !tbaa !5
  %39 = getelementptr inbounds %struct.TreeNode, ptr %38, i32 0, i32 2
  %40 = load ptr, ptr %39, align 8, !tbaa !13
  %41 = load ptr, ptr %5, align 8, !tbaa !5
  %42 = getelementptr inbounds %struct.TreeNode, ptr %41, i32 0, i32 2
  %43 = load ptr, ptr %42, align 8, !tbaa !13
  %44 = call i32 @isSameTree(ptr noundef %40, ptr noundef %43)
  %45 = icmp ne i32 %44, 0
  br i1 %45, label %47, label %46

46:                                               ; preds = %37, %28
  store i32 0, ptr %3, align 4
  br label %48

47:                                               ; preds = %37
  store i32 1, ptr %3, align 4
  br label %48

48:                                               ; preds = %47, %46, %27, %18, %11
  %49 = load i32, ptr %3, align 4
  ret i32 %49
}

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 = !{!"TreeNode", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 8}
!13 = !{!10, !6, i64 16}


; 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(read, inaccessiblemem: none) uwtable
define dso_local range(i32 0, 2) i32 @isSameTree(ptr noundef readonly %0, ptr noundef readonly %1) local_unnamed_addr #0 {
  %3 = icmp ne ptr %0, null
  %4 = icmp ne ptr %1, null
  %or.cond18 = or i1 %3, %4
  br i1 %or.cond18, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2, %tailrecurse
  %5 = phi i1 [ %21, %tailrecurse ], [ %4, %2 ]
  %6 = phi i1 [ %20, %tailrecurse ], [ %3, %2 ]
  %.tr1720 = phi ptr [ %19, %tailrecurse ], [ %1, %2 ]
  %.tr19 = phi ptr [ %17, %tailrecurse ], [ %0, %2 ]
  %or.cond3 = and i1 %6, %5
  br i1 %or.cond3, label %7, label %._crit_edge

7:                                                ; preds = %.lr.ph
  %8 = load i32, ptr %.tr19, align 8, !tbaa !5
  %9 = load i32, ptr %.tr1720, align 8, !tbaa !5
  %.not = icmp eq i32 %8, %9
  br i1 %.not, label %10, label %._crit_edge

10:                                               ; preds = %7
  %11 = getelementptr inbounds i8, ptr %.tr19, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !11
  %13 = getelementptr inbounds i8, ptr %.tr1720, i64 8
  %14 = load ptr, ptr %13, align 8, !tbaa !11
  %15 = tail call i32 @isSameTree(ptr noundef %12, ptr noundef %14)
  %.not15 = icmp eq i32 %15, 0
  br i1 %.not15, label %._crit_edge, label %tailrecurse

tailrecurse:                                      ; preds = %10
  %16 = getelementptr inbounds i8, ptr %.tr19, i64 16
  %17 = load ptr, ptr %16, align 8, !tbaa !12
  %18 = getelementptr inbounds i8, ptr %.tr1720, i64 16
  %19 = load ptr, ptr %18, align 8, !tbaa !12
  %20 = icmp ne ptr %17, null
  %21 = icmp ne ptr %19, null
  %or.cond = or i1 %20, %21
  br i1 %or.cond, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %tailrecurse, %.lr.ph, %7, %10, %2
  %.0 = phi i32 [ 1, %2 ], [ 0, %10 ], [ 0, %7 ], [ 0, %.lr.ph ], [ 1, %tailrecurse ]
  ret i32 %.0
}

attributes #0 = { nofree nosync nounwind memory(read, 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 = !{!"TreeNode", !7, i64 0, !10, i64 8, !10, i64 16}
!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 = !{!6, !10, i64 16}


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