; LLVM IR from sunkafei/xcpc-algorithm-templates :: 算法/数据结构/Euler-Tour-Tree.ll (ZN3ett5splayEi)

; 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"

@_ZN3ett2faE = external dso_local global [310000 x i32], align 16
@_ZN3ett3stkE = external dso_local global [310000 x i32], align 16

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN3ett6ascendEi(i32 noundef) #1

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_ZN3ett5splayEi(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  %5 = load i32, ptr %2, align 4, !tbaa !5
  store i32 %5, ptr %4, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %16, %1
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = icmp ne i32 %7, 0
  br i1 %8, label %10, label %9

9:                                                ; preds = %6
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  br label %21

10:                                               ; preds = %6
  %11 = load i32, ptr %4, align 4, !tbaa !5
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = add nsw i32 %12, 1
  store i32 %13, ptr %3, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [310000 x i32], ptr @_ZN3ett3stkE, i64 0, i64 %14
  store i32 %11, ptr %15, align 4, !tbaa !5
  br label %16

16:                                               ; preds = %10
  %17 = load i32, ptr %4, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [310000 x i32], ptr @_ZN3ett2faE, i64 0, i64 %18
  %20 = load i32, ptr %19, align 4, !tbaa !5
  store i32 %20, ptr %4, align 4, !tbaa !5
  br label %6, !llvm.loop !9

21:                                               ; preds = %9
  br label %22

22:                                               ; preds = %25, %21
  %23 = load i32, ptr %3, align 4, !tbaa !5
  %24 = icmp ne i32 %23, 0
  br i1 %24, label %25, label %31

25:                                               ; preds = %22
  %26 = load i32, ptr %3, align 4, !tbaa !5
  %27 = add nsw i32 %26, -1
  store i32 %27, ptr %3, align 4, !tbaa !5
  %28 = sext i32 %26 to i64
  %29 = getelementptr inbounds [310000 x i32], ptr @_ZN3ett3stkE, i64 0, i64 %28
  %30 = load i32, ptr %29, align 4, !tbaa !5
  call void @_ZN3ett8pushdownEi(i32 noundef %30)
  br label %22, !llvm.loop !11

31:                                               ; preds = %22
  %32 = load i32, ptr %2, align 4, !tbaa !5
  call void @_ZN3ett6ascendEi(i32 noundef %32)
  %33 = load i32, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  ret i32 %33
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZN3ett8pushdownEi(i32 noundef) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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" }
attributes #2 = { inlinehint mustprogress 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" }
attributes #3 = { nounwind }

!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"}
!11 = distinct !{!11, !10}


; 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"

@_ZN3ett2faE = external dso_local local_unnamed_addr global [310000 x i32], align 16
@_ZN3ett3stkE = external dso_local local_unnamed_addr global [310000 x i32], align 16

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN3ett6ascendEi(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_ZN3ett5splayEi(i32 noundef returned %0) local_unnamed_addr #0 {
  %.not11 = icmp eq i32 %0, 0
  br i1 %.not11, label %._crit_edge, label %.lr.ph

.lr.ph16.preheader:                               ; preds = %.lr.ph
  %2 = and i64 %indvars.iv.next, 4294967295
  br label %.lr.ph16

.lr.ph:                                           ; preds = %1, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %1 ]
  %.013 = phi i32 [ %6, %.lr.ph ], [ %0, %1 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %3 = getelementptr inbounds [310000 x i32], ptr @_ZN3ett3stkE, i64 0, i64 %indvars.iv.next
  store i32 %.013, ptr %3, align 4, !tbaa !5
  %4 = sext i32 %.013 to i64
  %5 = getelementptr inbounds [310000 x i32], ptr @_ZN3ett2faE, i64 0, i64 %4
  %6 = load i32, ptr %5, align 4, !tbaa !5
  %.not = icmp eq i32 %6, 0
  br i1 %.not, label %.lr.ph16.preheader, label %.lr.ph, !llvm.loop !9

.lr.ph16:                                         ; preds = %.lr.ph16.preheader, %.lr.ph16
  %indvars.iv18 = phi i64 [ %2, %.lr.ph16.preheader ], [ %indvars.iv.next19, %.lr.ph16 ]
  %indvars.iv.next19 = add nsw i64 %indvars.iv18, -1
  %7 = getelementptr inbounds [310000 x i32], ptr @_ZN3ett3stkE, i64 0, i64 %indvars.iv18
  %8 = load i32, ptr %7, align 4, !tbaa !5
  tail call void @_ZN3ett8pushdownEi(i32 noundef %8)
  %9 = icmp eq i64 %indvars.iv.next19, 0
  br i1 %9, label %._crit_edge, label %.lr.ph16, !llvm.loop !11

._crit_edge:                                      ; preds = %.lr.ph16, %1
  tail call void @_ZN3ett6ascendEi(i32 noundef %0)
  ret i32 %0
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZN3ett8pushdownEi(i32 noundef) local_unnamed_addr #1

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" }
attributes #1 = { inlinehint mustprogress 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


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