; LLVM IR from AlgoGenesis/C :: Binary Tree Algorithms/Merging Two BST into a Balanced BST (program)

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

; Function Attrs: nounwind uwtable
declare dso_local void @resizeStack(ptr noundef) #0

; Function Attrs: nounwind uwtable
define dso_local void @push(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  %5 = load ptr, ptr %3, align 8, !tbaa !5
  %6 = getelementptr inbounds %struct.Stack, ptr %5, i32 0, i32 1
  %7 = load i32, ptr %6, align 8, !tbaa !9
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.Stack, ptr %8, i32 0, i32 2
  %10 = load i32, ptr %9, align 4, !tbaa !12
  %11 = sub nsw i32 %10, 1
  %12 = icmp sge i32 %7, %11
  br i1 %12, label %13, label %15

13:                                               ; preds = %2
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  call void @resizeStack(ptr noundef %14)
  br label %15

15:                                               ; preds = %13, %2
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = load ptr, ptr %3, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.Stack, ptr %17, i32 0, i32 0
  %19 = load ptr, ptr %18, align 8, !tbaa !13
  %20 = load ptr, ptr %3, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.Stack, ptr %20, i32 0, i32 1
  %22 = load i32, ptr %21, align 8, !tbaa !9
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr %21, align 8, !tbaa !9
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds ptr, ptr %19, i64 %24
  store ptr %16, ptr %25, align 8, !tbaa !5
  ret void
}

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 8}
!10 = !{!"Stack", !6, i64 0, !11, i64 8, !11, i64 12}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !11, i64 12}
!13 = !{!10, !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: nounwind uwtable
declare dso_local void @resizeStack(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @push(ptr noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i8, ptr %0, i64 8
  %4 = load i32, ptr %3, align 8, !tbaa !5
  %5 = getelementptr inbounds i8, ptr %0, i64 12
  %6 = load i32, ptr %5, align 4, !tbaa !11
  %7 = add nsw i32 %6, -1
  %.not = icmp slt i32 %4, %7
  br i1 %.not, label %9, label %8

8:                                                ; preds = %2
  tail call void @resizeStack(ptr noundef nonnull %0)
  %.pre = load i32, ptr %3, align 8, !tbaa !5
  br label %9

9:                                                ; preds = %8, %2
  %10 = phi i32 [ %.pre, %8 ], [ %4, %2 ]
  %11 = load ptr, ptr %0, align 8, !tbaa !12
  %12 = add nsw i32 %10, 1
  store i32 %12, ptr %3, align 8, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds ptr, ptr %11, i64 %13
  store ptr %1, ptr %14, align 8, !tbaa !13
  ret void
}

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, !10, i64 8}
!6 = !{!"Stack", !7, i64 0, !10, i64 8, !10, i64 12}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!6, !10, i64 12}
!12 = !{!6, !7, i64 0}
!13 = !{!7, !7, i64 0}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,InstCombinePass,SROAPass,TailCallElimPass