; LLVM IR from upupming/algorithm :: CCCC-GPLT/L3-010. 是否完全二叉搜索树.ll (Z3BSTi)

; 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"

@tree = external dso_local global [1048576 x i32], align 16
@num = external dso_local global i32, align 4

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3BSTi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  %3 = load i32, ptr %2, align 4, !tbaa !5
  %4 = sext i32 %3 to i64
  %5 = getelementptr inbounds [1048576 x i32], ptr @tree, i64 0, i64 %4
  %6 = load i32, ptr %5, align 4, !tbaa !5
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %8, label %13

8:                                                ; preds = %1
  %9 = load i32, ptr @num, align 4, !tbaa !5
  %10 = load i32, ptr %2, align 4, !tbaa !5
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds [1048576 x i32], ptr @tree, i64 0, i64 %11
  store i32 %9, ptr %12, align 4, !tbaa !5
  br label %28

13:                                               ; preds = %1
  %14 = load i32, ptr %2, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [1048576 x i32], ptr @tree, i64 0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = load i32, ptr @num, align 4, !tbaa !5
  %19 = icmp slt i32 %17, %18
  br i1 %19, label %20, label %23

20:                                               ; preds = %13
  %21 = load i32, ptr %2, align 4, !tbaa !5
  %22 = shl i32 %21, 1
  call void @_Z3BSTi(i32 noundef %22)
  br label %27

23:                                               ; preds = %13
  %24 = load i32, ptr %2, align 4, !tbaa !5
  %25 = shl i32 %24, 1
  %26 = or i32 %25, 1
  call void @_Z3BSTi(i32 noundef %26)
  br label %27

27:                                               ; preds = %23, %20
  br label %28

28:                                               ; preds = %27, %8
  ret void
}

attributes #0 = { mustprogress 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


; 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"

@tree = external dso_local local_unnamed_addr global [1048576 x i32], align 16
@num = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z3BSTi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = sext i32 %0 to i64
  %3 = getelementptr inbounds [1048576 x i32], ptr @tree, i64 0, i64 %2
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = icmp eq i32 %4, 0
  %.pre = load i32, ptr @num, align 4, !tbaa !5
  br i1 %5, label %tailrecurse._crit_edge, label %tailrecurse.backedge

tailrecurse._crit_edge:                           ; preds = %tailrecurse.backedge, %1
  %.lcssa5 = phi i64 [ %2, %1 ], [ %11, %tailrecurse.backedge ]
  %6 = getelementptr inbounds [1048576 x i32], ptr @tree, i64 0, i64 %.lcssa5
  store i32 %.pre, ptr %6, align 4, !tbaa !5
  ret void

tailrecurse.backedge:                             ; preds = %1, %tailrecurse.backedge
  %7 = phi i32 [ %13, %tailrecurse.backedge ], [ %4, %1 ]
  %.tr6 = phi i32 [ %.tr.be, %tailrecurse.backedge ], [ %0, %1 ]
  %8 = icmp sge i32 %7, %.pre
  %9 = shl i32 %.tr6, 1
  %10 = zext i1 %8 to i32
  %.tr.be = or disjoint i32 %9, %10
  %11 = sext i32 %.tr.be to i64
  %12 = getelementptr inbounds [1048576 x i32], ptr @tree, i64 0, i64 %11
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %14 = icmp eq i32 %13, 0
  br i1 %14, label %tailrecurse._crit_edge, label %tailrecurse.backedge
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, 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, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass