; LLVM IR from VastoLorde95/Competitive-Programming :: HackerEarth/Upgrade/A.ll (Z23heavyLightDecompositionv)

; 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"

@a = external dso_local global [131072 x i32], align 16
@chain_num = external dso_local global i32, align 4
@chain_parent = external dso_local global [131072 x i32], align 16
@pos = external dso_local global [131072 x i32], align 16
@A = external dso_local global [131072 x i32], align 16
@n = external dso_local global i32, align 4

; 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 nounwind uwtable
declare dso_local void @_Z13makeJumpTablev() #1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z10heavylightii(i32 noundef, i32 noundef) #2

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z3dfsii(i32 noundef, i32 noundef) #2

; Function Attrs: mustprogress uwtable
define dso_local void @_Z23heavyLightDecompositionv() #2 {
  %1 = alloca i32, align 4
  call void @_Z3dfsii(i32 noundef 1, i32 noundef 1)
  store i32 1, ptr @chain_num, align 4, !tbaa !5
  %2 = load i32, ptr @chain_num, align 4, !tbaa !5
  %3 = sext i32 %2 to i64
  %4 = getelementptr inbounds [131072 x i32], ptr @chain_parent, i64 0, i64 %3
  store i32 1, ptr %4, align 4, !tbaa !5
  call void @_Z10heavylightii(i32 noundef 1, i32 noundef 1)
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  store i32 1, ptr %1, align 4, !tbaa !5
  br label %5

5:                                                ; preds = %21, %0
  %6 = load i32, ptr %1, align 4, !tbaa !5
  %7 = load i32, ptr @n, align 4, !tbaa !5
  %8 = icmp sle i32 %6, %7
  br i1 %8, label %10, label %9

9:                                                ; preds = %5
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  br label %24

10:                                               ; preds = %5
  %11 = load i32, ptr %1, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds [131072 x i32], ptr @a, i64 0, i64 %12
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %15 = load i32, ptr %1, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [131072 x i32], ptr @pos, i64 0, i64 %16
  %18 = load i32, ptr %17, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [131072 x i32], ptr @A, i64 0, i64 %19
  store i32 %14, ptr %20, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %10
  %22 = load i32, ptr %1, align 4, !tbaa !5
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr %1, align 4, !tbaa !5
  br label %5, !llvm.loop !9

24:                                               ; preds = %9
  call void @_Z13makeJumpTablev()
  ret void
}

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


; 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"

@a = external dso_local local_unnamed_addr global [131072 x i32], align 16
@chain_num = external dso_local local_unnamed_addr global i32, align 4
@chain_parent = external dso_local local_unnamed_addr global [131072 x i32], align 16
@pos = external dso_local local_unnamed_addr global [131072 x i32], align 16
@A = external dso_local local_unnamed_addr global [131072 x i32], align 16
@n = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z13makeJumpTablev() local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z10heavylightii(i32 noundef, i32 noundef) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z3dfsii(i32 noundef, i32 noundef) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z23heavyLightDecompositionv() local_unnamed_addr #1 {
  tail call void @_Z3dfsii(i32 noundef 1, i32 noundef 1)
  store i32 1, ptr @chain_num, align 4, !tbaa !5
  store i32 1, ptr getelementptr inbounds (i8, ptr @chain_parent, i64 4), align 4, !tbaa !5
  tail call void @_Z10heavylightii(i32 noundef 1, i32 noundef 1)
  %1 = load i32, ptr @n, align 4, !tbaa !5
  %.not4 = icmp slt i32 %1, 1
  br i1 %.not4, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %0
  %2 = zext nneg i32 %1 to i64
  %xtraiter = and i64 %2, 3
  %3 = icmp ult i32 %1, 4
  br i1 %3, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %2, 2147483644
  br label %.lr.ph

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %indvars.iv.unr = phi i64 [ 1, %.lr.ph.preheader ], [ %indvars.iv.next.3, %.lr.ph ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil
  %indvars.iv.epil = phi i64 [ %indvars.iv.next.epil, %.lr.ph.epil ], [ %indvars.iv.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i64 [ %epil.iter.next, %.lr.ph.epil ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %4 = getelementptr inbounds [131072 x i32], ptr @a, i64 0, i64 %indvars.iv.epil
  %5 = load i32, ptr %4, align 4, !tbaa !5
  %6 = getelementptr inbounds [131072 x i32], ptr @pos, i64 0, i64 %indvars.iv.epil
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds [131072 x i32], ptr @A, i64 0, i64 %8
  store i32 %5, ptr %9, align 4, !tbaa !5
  %indvars.iv.next.epil = add nuw nsw i64 %indvars.iv.epil, 1
  %epil.iter.next = add i64 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i64 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %._crit_edge, label %.lr.ph.epil, !llvm.loop !9

._crit_edge:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil, %0
  tail call void @_Z13makeJumpTablev()
  ret void

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 1, %.lr.ph.preheader.new ], [ %indvars.iv.next.3, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.3, %.lr.ph ]
  %10 = getelementptr inbounds [131072 x i32], ptr @a, i64 0, i64 %indvars.iv
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = getelementptr inbounds [131072 x i32], ptr @pos, i64 0, i64 %indvars.iv
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [131072 x i32], ptr @A, i64 0, i64 %14
  store i32 %11, ptr %15, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %16 = getelementptr inbounds [131072 x i32], ptr @a, i64 0, i64 %indvars.iv.next
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = getelementptr inbounds [131072 x i32], ptr @pos, i64 0, i64 %indvars.iv.next
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [131072 x i32], ptr @A, i64 0, i64 %20
  store i32 %17, ptr %21, align 4, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %22 = getelementptr inbounds [131072 x i32], ptr @a, i64 0, i64 %indvars.iv.next.1
  %23 = load i32, ptr %22, align 4, !tbaa !5
  %24 = getelementptr inbounds [131072 x i32], ptr @pos, i64 0, i64 %indvars.iv.next.1
  %25 = load i32, ptr %24, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [131072 x i32], ptr @A, i64 0, i64 %26
  store i32 %23, ptr %27, align 4, !tbaa !5
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %28 = getelementptr inbounds [131072 x i32], ptr @a, i64 0, i64 %indvars.iv.next.2
  %29 = load i32, ptr %28, align 4, !tbaa !5
  %30 = getelementptr inbounds [131072 x i32], ptr @pos, i64 0, i64 %indvars.iv.next.2
  %31 = load i32, ptr %30, align 4, !tbaa !5
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds [131072 x i32], ptr @A, i64 0, i64 %32
  store i32 %29, ptr %33, align 4, !tbaa !5
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %niter.next.3 = add i64 %niter, 4
  %niter.ncmp.3 = icmp eq i64 %niter.next.3, %unroll_iter
  br i1 %niter.ncmp.3, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !11
}

attributes #0 = { 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 #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" }

!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.unroll.disable"}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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