; LLVM IR from tangjz/acm-icpc :: lydsy/1039.ll (Z5checkii)

; 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"

%struct.Node = type { i32, i32, i32, i32 }

@a = external dso_local global [1650050 x %struct.Node], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z5checkii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i1, align 1
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %8 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %8, ptr %6, align 4, !tbaa !5
  br label %9

9:                                                ; preds = %23, %2
  %10 = load i32, ptr %6, align 4, !tbaa !5
  %11 = load i32, ptr %5, align 4, !tbaa !5
  %12 = icmp slt i32 %10, %11
  br i1 %12, label %14, label %13

13:                                               ; preds = %9
  store i32 2, ptr %7, align 4
  br label %26

14:                                               ; preds = %9
  %15 = load i32, ptr %6, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [1650050 x %struct.Node], ptr @a, i64 0, i64 %16
  %18 = getelementptr inbounds %struct.Node, ptr %17, i32 0, i32 3
  %19 = load i32, ptr %18, align 4, !tbaa !9
  %20 = icmp ne i32 %19, 0
  br i1 %20, label %21, label %22

21:                                               ; preds = %14
  store i1 true, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %26

22:                                               ; preds = %14
  br label %23

23:                                               ; preds = %22
  %24 = load i32, ptr %6, align 4, !tbaa !5
  %25 = add nsw i32 %24, 1
  store i32 %25, ptr %6, align 4, !tbaa !5
  br label %9, !llvm.loop !11

26:                                               ; preds = %21, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %27 = load i32, ptr %7, align 4
  switch i32 %27, label %31 [
    i32 2, label %28
    i32 1, label %29
  ]

28:                                               ; preds = %26
  store i1 false, ptr %3, align 1
  br label %29

29:                                               ; preds = %28, %26
  %30 = load i1, ptr %3, align 1
  ret i1 %30

31:                                               ; preds = %26
  unreachable
}

; 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 = !{!10, !6, i64 12}
!10 = !{!"_ZTS4Node", !6, i64 0, !6, i64 4, !6, i64 8, !6, i64 12}
!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"

%struct.Node = type { i32, i32, i32, i32 }

@a = external dso_local local_unnamed_addr global [1650050 x %struct.Node], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef zeroext i1 @_Z5checkii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %.not89 = icmp slt i32 %0, %1
  br i1 %.not89, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %3 = sext i32 %0 to i64
  %4 = sext i32 %1 to i64
  %5 = getelementptr inbounds [1650050 x %struct.Node], ptr @a, i64 0, i64 %3, i32 3
  %6 = load i32, ptr %5, align 4, !tbaa !5
  %.not14 = icmp eq i32 %6, 0
  br i1 %.not14, label %.lr.ph16, label %._crit_edge

.lr.ph16:                                         ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv15 = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %3, %.lr.ph.preheader ]
  %indvars.iv.next = add nsw i64 %indvars.iv15, 1
  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
  %exitcond.not = icmp eq i32 %lftr.wideiv, %1
  br i1 %exitcond.not, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !10

.lr.ph:                                           ; preds = %.lr.ph16
  %7 = getelementptr inbounds [1650050 x %struct.Node], ptr @a, i64 0, i64 %indvars.iv.next, i32 3
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %.not = icmp eq i32 %8, 0
  br i1 %.not, label %.lr.ph16, label %._crit_edge.loopexit, !llvm.loop !10

._crit_edge.loopexit:                             ; preds = %.lr.ph16, %.lr.ph
  %.not8.le = icmp slt i64 %indvars.iv.next, %4
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %.lr.ph.preheader, %2
  %.not8.lcssa = phi i1 [ false, %2 ], [ true, %.lr.ph.preheader ], [ %.not8.le, %._crit_edge.loopexit ]
  ret i1 %.not8.lcssa
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) 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, !7, i64 12}
!6 = !{!"_ZTS4Node", !7, i64 0, !7, i64 4, !7, i64 8, !7, i64 12}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}


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