; LLVM IR from priyankchheda/algorithms :: _other_languages/c_language/dynamic_connectivity/quick_find (quick_find)

; 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: 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: nounwind uwtable
define dso_local void @join_union(ptr noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) #1 {
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !9
  store i32 %3, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %12 = load ptr, ptr %5, align 8, !tbaa !5
  %13 = load i32, ptr %7, align 4, !tbaa !9
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds i32, ptr %12, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !9
  store i32 %16, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %17 = load ptr, ptr %5, align 8, !tbaa !5
  %18 = load i32, ptr %8, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds i32, ptr %17, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !9
  store i32 %21, ptr %10, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #2
  store i32 0, ptr %11, align 4, !tbaa !9
  br label %22

22:                                               ; preds = %42, %4
  %23 = load i32, ptr %11, align 4, !tbaa !9
  %24 = load i32, ptr %6, align 4, !tbaa !9
  %25 = icmp slt i32 %23, %24
  br i1 %25, label %27, label %26

26:                                               ; preds = %22
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #2
  br label %45

27:                                               ; preds = %22
  %28 = load ptr, ptr %5, align 8, !tbaa !5
  %29 = load i32, ptr %11, align 4, !tbaa !9
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds i32, ptr %28, i64 %30
  %32 = load i32, ptr %31, align 4, !tbaa !9
  %33 = load i32, ptr %9, align 4, !tbaa !9
  %34 = icmp eq i32 %32, %33
  br i1 %34, label %35, label %41

35:                                               ; preds = %27
  %36 = load i32, ptr %10, align 4, !tbaa !9
  %37 = load ptr, ptr %5, align 8, !tbaa !5
  %38 = load i32, ptr %11, align 4, !tbaa !9
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds i32, ptr %37, i64 %39
  store i32 %36, ptr %40, align 4, !tbaa !9
  br label %41

41:                                               ; preds = %35, %27
  br label %42

42:                                               ; preds = %41
  %43 = load i32, ptr %11, align 4, !tbaa !9
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %11, align 4, !tbaa !9
  br label %22, !llvm.loop !11

45:                                               ; preds = %26
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = { 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 = !{!"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}
!11 = distinct !{!11, !12}
!12 = !{!"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"

; Function Attrs: nofree norecurse nosync nounwind memory(argmem: readwrite) uwtable
define dso_local void @join_union(ptr nocapture noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = sext i32 %2 to i64
  %6 = getelementptr inbounds i32, ptr %0, i64 %5
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = sext i32 %3 to i64
  %9 = getelementptr inbounds i32, ptr %0, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = icmp sgt i32 %1, 0
  br i1 %11, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %4
  %wide.trip.count = zext nneg i32 %1 to i64
  %min.iters.check = icmp ult i32 %1, 8
  br i1 %min.iters.check, label %.lr.ph.preheader29, label %vector.ph

.lr.ph.preheader29:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  br label %.lr.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %wide.trip.count, 2147483640
  %broadcast.splatinsert = insertelement <4 x i32> poison, i32 %7, i64 0
  %broadcast.splat = shufflevector <4 x i32> %broadcast.splatinsert, <4 x i32> poison, <4 x i32> zeroinitializer
  br label %vector.body

vector.body:                                      ; preds = %pred.store.continue28, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %pred.store.continue28 ]
  %12 = or disjoint i64 %index, 4
  %13 = getelementptr inbounds i32, ptr %0, i64 %index
  %14 = getelementptr inbounds i8, ptr %13, i64 16
  %wide.load = load <4 x i32>, ptr %13, align 4, !tbaa !5
  %wide.load14 = load <4 x i32>, ptr %14, align 4, !tbaa !5
  %15 = icmp eq <4 x i32> %wide.load, %broadcast.splat
  %16 = icmp eq <4 x i32> %wide.load14, %broadcast.splat
  %17 = extractelement <4 x i1> %15, i64 0
  br i1 %17, label %pred.store.if, label %pred.store.continue

pred.store.if:                                    ; preds = %vector.body
  %18 = getelementptr inbounds i32, ptr %0, i64 %index
  store i32 %10, ptr %18, align 4, !tbaa !5
  br label %pred.store.continue

pred.store.continue:                              ; preds = %pred.store.if, %vector.body
  %19 = extractelement <4 x i1> %15, i64 1
  br i1 %19, label %pred.store.if15, label %pred.store.continue16

pred.store.if15:                                  ; preds = %pred.store.continue
  %20 = or disjoint i64 %index, 1
  %21 = getelementptr inbounds i32, ptr %0, i64 %20
  store i32 %10, ptr %21, align 4, !tbaa !5
  br label %pred.store.continue16

pred.store.continue16:                            ; preds = %pred.store.if15, %pred.store.continue
  %22 = extractelement <4 x i1> %15, i64 2
  br i1 %22, label %pred.store.if17, label %pred.store.continue18

pred.store.if17:                                  ; preds = %pred.store.continue16
  %23 = or disjoint i64 %index, 2
  %24 = getelementptr inbounds i32, ptr %0, i64 %23
  store i32 %10, ptr %24, align 4, !tbaa !5
  br label %pred.store.continue18

pred.store.continue18:                            ; preds = %pred.store.if17, %pred.store.continue16
  %25 = extractelement <4 x i1> %15, i64 3
  br i1 %25, label %pred.store.if19, label %pred.store.continue20

pred.store.if19:                                  ; preds = %pred.store.continue18
  %26 = or disjoint i64 %index, 3
  %27 = getelementptr inbounds i32, ptr %0, i64 %26
  store i32 %10, ptr %27, align 4, !tbaa !5
  br label %pred.store.continue20

pred.store.continue20:                            ; preds = %pred.store.if19, %pred.store.continue18
  %28 = extractelement <4 x i1> %16, i64 0
  br i1 %28, label %pred.store.if21, label %pred.store.continue22

pred.store.if21:                                  ; preds = %pred.store.continue20
  %29 = getelementptr inbounds i32, ptr %0, i64 %12
  store i32 %10, ptr %29, align 4, !tbaa !5
  br label %pred.store.continue22

pred.store.continue22:                            ; preds = %pred.store.if21, %pred.store.continue20
  %30 = extractelement <4 x i1> %16, i64 1
  br i1 %30, label %pred.store.if23, label %pred.store.continue24

pred.store.if23:                                  ; preds = %pred.store.continue22
  %31 = or disjoint i64 %index, 5
  %32 = getelementptr inbounds i32, ptr %0, i64 %31
  store i32 %10, ptr %32, align 4, !tbaa !5
  br label %pred.store.continue24

pred.store.continue24:                            ; preds = %pred.store.if23, %pred.store.continue22
  %33 = extractelement <4 x i1> %16, i64 2
  br i1 %33, label %pred.store.if25, label %pred.store.continue26

pred.store.if25:                                  ; preds = %pred.store.continue24
  %34 = or disjoint i64 %index, 6
  %35 = getelementptr inbounds i32, ptr %0, i64 %34
  store i32 %10, ptr %35, align 4, !tbaa !5
  br label %pred.store.continue26

pred.store.continue26:                            ; preds = %pred.store.if25, %pred.store.continue24
  %36 = extractelement <4 x i1> %16, i64 3
  br i1 %36, label %pred.store.if27, label %pred.store.continue28

pred.store.if27:                                  ; preds = %pred.store.continue26
  %37 = or disjoint i64 %index, 7
  %38 = getelementptr inbounds i32, ptr %0, i64 %37
  store i32 %10, ptr %38, align 4, !tbaa !5
  br label %pred.store.continue28

pred.store.continue28:                            ; preds = %pred.store.if27, %pred.store.continue26
  %index.next = add nuw i64 %index, 8
  %39 = icmp eq i64 %index.next, %n.vec
  br i1 %39, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %pred.store.continue28
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader29

._crit_edge:                                      ; preds = %44, %middle.block, %4
  ret void

.lr.ph:                                           ; preds = %.lr.ph.preheader29, %44
  %indvars.iv = phi i64 [ %indvars.iv.next, %44 ], [ %indvars.iv.ph, %.lr.ph.preheader29 ]
  %40 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %41 = load i32, ptr %40, align 4, !tbaa !5
  %42 = icmp eq i32 %41, %7
  br i1 %42, label %43, label %44

43:                                               ; preds = %.lr.ph
  store i32 %10, ptr %40, align 4, !tbaa !5
  br label %44

44:                                               ; preds = %.lr.ph, %43
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: readwrite) 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/C++ TBAA"}
!9 = distinct !{!9, !10, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !12, !11}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass