; LLVM IR from kaynewbie/algorithm :: algorithm/CodingInterviews (question-33)

; 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"

; Function Attrs: nounwind uwtable
define dso_local zeroext i1 @isPostOrderOfBST(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca i1, align 1
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  %6 = load ptr, ptr %4, align 8, !tbaa !5
  %7 = icmp eq ptr %6, null
  br i1 %7, label %11, label %8

8:                                                ; preds = %2
  %9 = load i32, ptr %5, align 4, !tbaa !9
  %10 = icmp sle i32 %9, 0
  br i1 %10, label %11, label %12

11:                                               ; preds = %8, %2
  store i1 false, ptr %3, align 1
  br label %17

12:                                               ; preds = %8
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = load i32, ptr %5, align 4, !tbaa !9
  %15 = sub nsw i32 %14, 1
  %16 = call zeroext i1 @portion(ptr noundef %13, i32 noundef 0, i32 noundef %15)
  store i1 %16, ptr %3, align 1
  br label %17

17:                                               ; preds = %12, %11
  %18 = load i1, ptr %3, align 1
  ret i1 %18
}

; Function Attrs: nounwind uwtable
declare dso_local zeroext i1 @portion(ptr noundef, i32 noundef, i32 noundef) #0

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, !10, i64 0}
!10 = !{!"int", !7, 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
define dso_local zeroext i1 @isPostOrderOfBST(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %0, null
  %4 = icmp slt i32 %1, 1
  %or.cond = or i1 %3, %4
  br i1 %or.cond, label %8, label %5

5:                                                ; preds = %2
  %6 = add nsw i32 %1, -1
  %7 = tail call zeroext i1 @portion(ptr noundef nonnull %0, i32 noundef 0, i32 noundef %6)
  br label %8

8:                                                ; preds = %2, %5
  %.0 = phi i1 [ %7, %5 ], [ false, %2 ]
  ret i1 %.0
}

; Function Attrs: nounwind uwtable
declare dso_local zeroext i1 @portion(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

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)"}


; Effective O3 passes: CorrelatedValuePropagationPass,GlobalOptPass,IPSCCPPass,InstCombinePass,SROAPass,SimplifyCFGPass,TailCallElimPass