; LLVM IR from kaynewbie/algorithm :: algorithm/LeetCode/Easy (same-tree)

; 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 zeroext i1 @isSameTree(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca i1, align 1
  %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 eq ptr %6, null
  %8 = zext i1 %7 to i32
  %9 = load ptr, ptr %5, align 8, !tbaa !5
  %10 = icmp eq ptr %9, null
  %11 = zext i1 %10 to i32
  %12 = xor i32 %8, %11
  %13 = icmp eq i32 %12, 1
  br i1 %13, label %14, label %15

14:                                               ; preds = %2
  store i1 false, ptr %3, align 1
  br label %51

15:                                               ; preds = %2
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = icmp eq ptr %16, null
  %18 = zext i1 %17 to i32
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = icmp eq ptr %19, null
  %21 = zext i1 %20 to i32
  %22 = and i32 %18, %21
  %23 = icmp ne i32 %22, 0
  br i1 %23, label %24, label %25

24:                                               ; preds = %15
  store i1 true, ptr %3, align 1
  br label %51

25:                                               ; preds = %15
  %26 = load ptr, ptr %4, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.TreeNode, ptr %26, i32 0, i32 0
  %28 = load i32, ptr %27, align 8, !tbaa !9
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.TreeNode, ptr %29, i32 0, i32 0
  %31 = load i32, ptr %30, align 8, !tbaa !9
  %32 = icmp eq i32 %28, %31
  br i1 %32, label %33, label %49

33:                                               ; preds = %25
  %34 = load ptr, ptr %4, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.TreeNode, ptr %34, i32 0, i32 1
  %36 = load ptr, ptr %35, align 8, !tbaa !12
  %37 = load ptr, ptr %5, align 8, !tbaa !5
  %38 = getelementptr inbounds %struct.TreeNode, ptr %37, i32 0, i32 1
  %39 = load ptr, ptr %38, align 8, !tbaa !12
  %40 = call zeroext i1 @isSameTree(ptr noundef %36, ptr noundef %39)
  br i1 %40, label %41, label %49

41:                                               ; preds = %33
  %42 = load ptr, ptr %4, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.TreeNode, ptr %42, i32 0, i32 2
  %44 = load ptr, ptr %43, align 8, !tbaa !13
  %45 = load ptr, ptr %5, align 8, !tbaa !5
  %46 = getelementptr inbounds %struct.TreeNode, ptr %45, i32 0, i32 2
  %47 = load ptr, ptr %46, align 8, !tbaa !13
  %48 = call zeroext i1 @isSameTree(ptr noundef %44, ptr noundef %47)
  br label %49

49:                                               ; preds = %41, %33, %25
  %50 = phi i1 [ false, %33 ], [ false, %25 ], [ %48, %41 ]
  store i1 %50, ptr %3, align 1
  br label %51

51:                                               ; preds = %49, %24, %14
  %52 = load i1, ptr %3, align 1
  ret i1 %52
}

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 noundef zeroext i1 @isSameTree(ptr noundef readonly %0, ptr noundef readonly %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %0, null
  %4 = icmp eq ptr %1, null
  %5 = xor i1 %3, %4
  br i1 %5, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %tailrecurse
  %6 = phi i1 [ %24, %tailrecurse ], [ %4, %2 ]
  %7 = phi i1 [ %23, %tailrecurse ], [ %3, %2 ]
  %.tr1113 = phi ptr [ %22, %tailrecurse ], [ %1, %2 ]
  %.tr12 = phi ptr [ %20, %tailrecurse ], [ %0, %2 ]
  %8 = and i1 %7, %6
  br i1 %8, label %._crit_edge, label %9

9:                                                ; preds = %.lr.ph
  %10 = load i32, ptr %.tr12, align 8, !tbaa !5
  %11 = load i32, ptr %.tr1113, align 8, !tbaa !5
  %12 = icmp eq i32 %10, %11
  br i1 %12, label %13, label %._crit_edge

13:                                               ; preds = %9
  %14 = getelementptr inbounds i8, ptr %.tr12, i64 8
  %15 = load ptr, ptr %14, align 8, !tbaa !11
  %16 = getelementptr inbounds i8, ptr %.tr1113, i64 8
  %17 = load ptr, ptr %16, align 8, !tbaa !11
  %18 = tail call zeroext i1 @isSameTree(ptr noundef %15, ptr noundef %17)
  br i1 %18, label %tailrecurse, label %._crit_edge

tailrecurse:                                      ; preds = %13
  %19 = getelementptr inbounds i8, ptr %.tr12, i64 16
  %20 = load ptr, ptr %19, align 8, !tbaa !12
  %21 = getelementptr inbounds i8, ptr %.tr1113, i64 16
  %22 = load ptr, ptr %21, align 8, !tbaa !12
  %23 = icmp eq ptr %20, null
  %24 = icmp eq ptr %22, null
  %25 = xor i1 %23, %24
  br i1 %25, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %tailrecurse, %.lr.ph, %13, %9, %2
  %.0 = phi i1 [ false, %2 ], [ %8, %9 ], [ %8, %13 ], [ %8, %.lr.ph ], [ %8, %tailrecurse ]
  ret i1 %.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: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass