; LLVM IR from Dev-XYS/Algorithms :: Link-Cut-Tree(with-Reverse).ll (Z8find_topi)

; 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"

@ch = external dso_local global [10010 x [2 x i32]], align 16

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z9push_downi(i32 noundef) #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5splayii(i32 noundef, i32 noundef) #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z8find_topi(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
  call void @_Z9push_downi(i32 noundef %3)
  br label %4

4:                                                ; preds = %11, %1
  %5 = load i32, ptr %2, align 4, !tbaa !5
  %6 = sext i32 %5 to i64
  %7 = getelementptr inbounds [10010 x [2 x i32]], ptr @ch, i64 0, i64 %6
  %8 = getelementptr inbounds [2 x i32], ptr %7, i64 0, i64 0
  %9 = load i32, ptr %8, align 8, !tbaa !5
  %10 = icmp ne i32 %9, 0
  br i1 %10, label %11, label %18

11:                                               ; preds = %4
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [10010 x [2 x i32]], ptr @ch, i64 0, i64 %13
  %15 = getelementptr inbounds [2 x i32], ptr %14, i64 0, i64 0
  %16 = load i32, ptr %15, align 8, !tbaa !5
  store i32 %16, ptr %2, align 4, !tbaa !5
  %17 = load i32, ptr %2, align 4, !tbaa !5
  call void @_Z9push_downi(i32 noundef %17)
  br label %4, !llvm.loop !9

18:                                               ; preds = %4
  %19 = load i32, ptr %2, align 4, !tbaa !5
  call void @_Z5splayii(i32 noundef %19, i32 noundef 0)
  %20 = load i32, ptr %2, align 4, !tbaa !5
  ret i32 %20
}

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"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; 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"

@ch = external dso_local local_unnamed_addr global [10010 x [2 x i32]], align 16

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z9push_downi(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5splayii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z8find_topi(i32 noundef %0) local_unnamed_addr #0 {
  tail call void @_Z9push_downi(i32 noundef %0)
  %2 = sext i32 %0 to i64
  %3 = getelementptr inbounds [10010 x [2 x i32]], ptr @ch, i64 0, i64 %2
  %4 = load i32, ptr %3, align 8, !tbaa !5
  %.not7 = icmp eq i32 %4, 0
  br i1 %.not7, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %.lr.ph
  %5 = phi i32 [ %8, %.lr.ph ], [ %4, %1 ]
  tail call void @_Z9push_downi(i32 noundef %5)
  %6 = sext i32 %5 to i64
  %7 = getelementptr inbounds [10010 x [2 x i32]], ptr @ch, i64 0, i64 %6
  %8 = load i32, ptr %7, align 8, !tbaa !5
  %.not = icmp eq i32 %8, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %1
  %.0.lcssa = phi i32 [ %0, %1 ], [ %5, %.lr.ph ]
  tail call void @_Z5splayii(i32 noundef %.0.lcssa, i32 noundef 0)
  ret i32 %.0.lcssa
}

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"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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