; LLVM IR from tangjz/acm-icpc :: lydsy/1059.ll (Z5checkv)

; 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"

@n = external dso_local global i32, align 4
@y = external dso_local global [201 x i8], align 16

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_Z4findi(i32 noundef) #0

; 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

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z5checkv() #0 {
  %1 = alloca i1, align 1
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  store i32 1, ptr %2, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %14, %0
  %5 = load i32, ptr %2, align 4, !tbaa !5
  %6 = load i32, ptr @n, align 4, !tbaa !5
  %7 = icmp sle i32 %5, %6
  br i1 %7, label %9, label %8

8:                                                ; preds = %4
  store i32 2, ptr %3, align 4
  br label %17

9:                                                ; preds = %4
  call void @llvm.memset.p0.i64(ptr align 16 @y, i8 0, i64 201, i1 false)
  %10 = load i32, ptr %2, align 4, !tbaa !5
  %11 = call noundef zeroext i1 @_Z4findi(i32 noundef %10)
  br i1 %11, label %13, label %12

12:                                               ; preds = %9
  store i1 false, ptr %1, align 1
  store i32 1, ptr %3, align 4
  br label %17

13:                                               ; preds = %9
  br label %14

14:                                               ; preds = %13
  %15 = load i32, ptr %2, align 4, !tbaa !5
  %16 = add nsw i32 %15, 1
  store i32 %16, ptr %2, align 4, !tbaa !5
  br label %4, !llvm.loop !9

17:                                               ; preds = %12, %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  %18 = load i32, ptr %3, align 4
  switch i32 %18, label %22 [
    i32 2, label %19
    i32 1, label %20
  ]

19:                                               ; preds = %17
  store i1 true, ptr %1, align 1
  br label %20

20:                                               ; preds = %19, %17
  %21 = load i1, ptr %1, align 1
  ret i1 %21

22:                                               ; preds = %17
  unreachable
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2

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

@n = external dso_local local_unnamed_addr global i32, align 4
@y = external dso_local local_unnamed_addr global [201 x i8], align 16

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_Z4findi(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z5checkv() local_unnamed_addr #0 {
  %1 = load i32, ptr @n, align 4, !tbaa !5
  %.not6 = icmp slt i32 %1, 1
  br i1 %.not6, label %._crit_edge, label %.lr.ph

2:                                                ; preds = %.lr.ph
  %3 = add nuw nsw i32 %.047, 1
  %4 = load i32, ptr @n, align 4, !tbaa !5
  %.not.not = icmp slt i32 %.047, %4
  br i1 %.not.not, label %.lr.ph, label %._crit_edge, !llvm.loop !9

.lr.ph:                                           ; preds = %0, %2
  %.047 = phi i32 [ %3, %2 ], [ 1, %0 ]
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(201) @y, i8 0, i64 201, i1 false)
  %5 = tail call noundef zeroext i1 @_Z4findi(i32 noundef %.047)
  br i1 %5, label %2, label %._crit_edge

._crit_edge:                                      ; preds = %2, %.lr.ph, %0
  %.not.lcssa = phi i1 [ true, %0 ], [ %5, %.lr.ph ], [ %5, %2 ]
  ret i1 %.not.lcssa
}

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #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 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: write) }

!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"}


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