; LLVM IR from sunkafei/xcpc-algorithm-templates :: 算法/基础算法/动态维护连续相同数字区间.ll (Z4initv)

; 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 [210000 x i32], align 16
@val = external dso_local global [210000 x i32], align 16
@n = external dso_local global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z5buildv() #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z4initv() #0 {
  %1 = alloca i32, align 4
  %2 = load i32, ptr @n, align 4, !tbaa !5
  %3 = add nsw i32 %2, 1
  %4 = sext i32 %3 to i64
  %5 = getelementptr inbounds [210000 x i32], ptr @A, i64 0, i64 %4
  store i32 -1, ptr %5, align 4, !tbaa !5
  store i32 -1, ptr @A, align 16, !tbaa !5
  %6 = load i32, ptr getelementptr inbounds ([210000 x i32], ptr @A, i64 0, i64 1), align 4, !tbaa !5
  store i32 %6, ptr getelementptr inbounds ([210000 x i32], ptr @val, i64 0, i64 1), align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  store i32 2, ptr %1, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %34, %0
  %8 = load i32, ptr %1, align 4, !tbaa !5
  %9 = load i32, ptr @n, align 4, !tbaa !5
  %10 = icmp sle i32 %8, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #2
  br label %37

12:                                               ; preds = %7
  %13 = load i32, ptr %1, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [210000 x i32], ptr @A, i64 0, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = load i32, ptr %1, align 4, !tbaa !5
  %18 = sub nsw i32 %17, 1
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [210000 x i32], ptr @A, i64 0, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = icmp eq i32 %16, %21
  br i1 %22, label %23, label %24

23:                                               ; preds = %12
  br label %29

24:                                               ; preds = %12
  %25 = load i32, ptr %1, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [210000 x i32], ptr @A, i64 0, i64 %26
  %28 = load i32, ptr %27, align 4, !tbaa !5
  br label %29

29:                                               ; preds = %24, %23
  %30 = phi i32 [ -1, %23 ], [ %28, %24 ]
  %31 = load i32, ptr %1, align 4, !tbaa !5
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds [210000 x i32], ptr @val, i64 0, i64 %32
  store i32 %30, ptr %33, align 4, !tbaa !5
  br label %34

34:                                               ; preds = %29
  %35 = load i32, ptr %1, align 4, !tbaa !5
  %36 = add nsw i32 %35, 1
  store i32 %36, ptr %1, align 4, !tbaa !5
  br label %7, !llvm.loop !9

37:                                               ; preds = %11
  call void @_Z5buildv()
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!"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 [210000 x i32], align 16
@val = external dso_local local_unnamed_addr global [210000 x i32], align 16
@n = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z5buildv() local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z4initv() local_unnamed_addr #0 {
  %1 = load i32, ptr @n, align 4, !tbaa !5
  %2 = add i32 %1, 1
  %3 = sext i32 %2 to i64
  %4 = getelementptr inbounds [210000 x i32], ptr @A, i64 0, i64 %3
  store i32 -1, ptr %4, align 4, !tbaa !5
  store i32 -1, ptr @A, align 16, !tbaa !5
  %5 = load i32, ptr getelementptr inbounds (i8, ptr @A, i64 4), align 4, !tbaa !5
  store i32 %5, ptr getelementptr inbounds (i8, ptr @val, i64 4), align 4, !tbaa !5
  %.not7 = icmp slt i32 %1, 2
  br i1 %.not7, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %0
  %wide.trip.count = zext i32 %2 to i64
  %6 = add nsw i64 %wide.trip.count, -2
  %min.iters.check = icmp ult i64 %6, 8
  br i1 %min.iters.check, label %.lr.ph.preheader11, label %vector.ph

.lr.ph.preheader11:                               ; preds = %middle.block, %.lr.ph.preheader
  %.ph = phi i32 [ %5, %.lr.ph.preheader ], [ %vector.recur.extract, %middle.block ]
  %indvars.iv.ph = phi i64 [ 2, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  br label %.lr.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %6, -8
  %ind.end = or disjoint i64 %n.vec, 2
  %vector.recur.init = insertelement <4 x i32> poison, i32 %5, i64 3
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vector.recur = phi <4 x i32> [ %vector.recur.init, %vector.ph ], [ %wide.load10, %vector.body ]
  %offset.idx = or disjoint i64 %index, 2
  %7 = getelementptr inbounds [210000 x i32], ptr @A, i64 0, i64 %offset.idx
  %8 = getelementptr inbounds i8, ptr %7, i64 16
  %wide.load = load <4 x i32>, ptr %7, align 8, !tbaa !5
  %wide.load10 = load <4 x i32>, ptr %8, align 8, !tbaa !5
  %9 = shufflevector <4 x i32> %vector.recur, <4 x i32> %wide.load, <4 x i32> <i32 3, i32 4, i32 5, i32 6>
  %10 = shufflevector <4 x i32> %wide.load, <4 x i32> %wide.load10, <4 x i32> <i32 3, i32 4, i32 5, i32 6>
  %11 = icmp eq <4 x i32> %wide.load, %9
  %12 = icmp eq <4 x i32> %wide.load10, %10
  %13 = select <4 x i1> %11, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, <4 x i32> %wide.load
  %14 = select <4 x i1> %12, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, <4 x i32> %wide.load10
  %15 = getelementptr inbounds [210000 x i32], ptr @val, i64 0, i64 %offset.idx
  %16 = getelementptr inbounds i8, ptr %15, i64 16
  store <4 x i32> %13, ptr %15, align 8, !tbaa !5
  store <4 x i32> %14, ptr %16, align 8, !tbaa !5
  %index.next = add nuw i64 %index, 8
  %17 = icmp eq i64 %index.next, %n.vec
  br i1 %17, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %vector.recur.extract = extractelement <4 x i32> %wide.load10, i64 3
  %cmp.n = icmp eq i64 %6, %n.vec
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader11

._crit_edge:                                      ; preds = %.lr.ph, %middle.block, %0
  tail call void @_Z5buildv()
  ret void

.lr.ph:                                           ; preds = %.lr.ph.preheader11, %.lr.ph
  %18 = phi i32 [ %20, %.lr.ph ], [ %.ph, %.lr.ph.preheader11 ]
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %indvars.iv.ph, %.lr.ph.preheader11 ]
  %19 = getelementptr inbounds [210000 x i32], ptr @A, i64 0, i64 %indvars.iv
  %20 = load i32, ptr %19, align 4, !tbaa !5
  %21 = icmp eq i32 %20, %18
  %spec.select = select i1 %21, i32 -1, i32 %20
  %22 = getelementptr inbounds [210000 x i32], ptr @val, i64 0, i64 %indvars.iv
  store i32 %spec.select, ptr %22, align 4, !tbaa !5
  %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 = { 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, !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: BDCEPass,EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,SROAPass,SimplifyCFGPass,TailCallElimPass