; LLVM IR from tangjz/acm-icpc :: lydsy/1044.ll (Z5checki)

; 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
@m = external dso_local global i32, align 4
@a = external dso_local global [50010 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z5checki(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %29, %1
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = load i32, ptr @n, align 4, !tbaa !5
  %9 = icmp sle i32 %7, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %6
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %32

11:                                               ; preds = %6
  %12 = load i32, ptr %4, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [50010 x i32], ptr @a, i64 0, i64 %13
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = load i32, ptr %5, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [50010 x i32], ptr @a, i64 0, i64 %17
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %20 = sub nsw i32 %15, %19
  %21 = load i32, ptr %2, align 4, !tbaa !5
  %22 = icmp sgt i32 %20, %21
  br i1 %22, label %23, label %28

23:                                               ; preds = %11
  %24 = load i32, ptr %4, align 4, !tbaa !5
  %25 = sub nsw i32 %24, 1
  store i32 %25, ptr %5, align 4, !tbaa !5
  %26 = load i32, ptr %3, align 4, !tbaa !5
  %27 = add nsw i32 %26, 1
  store i32 %27, ptr %3, align 4, !tbaa !5
  br label %28

28:                                               ; preds = %23, %11
  br label %29

29:                                               ; preds = %28
  %30 = load i32, ptr %4, align 4, !tbaa !5
  %31 = add nsw i32 %30, 1
  store i32 %31, ptr %4, align 4, !tbaa !5
  br label %6, !llvm.loop !9

32:                                               ; preds = %10
  %33 = load i32, ptr %3, align 4, !tbaa !5
  %34 = load i32, ptr @m, align 4, !tbaa !5
  %35 = icmp sle i32 %33, %34
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i1 %35
}

; 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"

@n = external dso_local local_unnamed_addr global i32, align 4
@m = external dso_local local_unnamed_addr global i32, align 4
@a = external dso_local local_unnamed_addr global [50010 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef zeroext i1 @_Z5checki(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @n, align 4, !tbaa !5
  %.not11 = icmp slt i32 %2, 1
  br i1 %.not11, label %._crit_edge, label %.lr.ph.preheader

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

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %3, 2147483646
  br label %.lr.ph

._crit_edge.loopexit.unr-lcssa.loopexit:          ; preds = %.lr.ph
  %5 = sext i32 %.1.1 to i64
  br label %._crit_edge.loopexit.unr-lcssa

._crit_edge.loopexit.unr-lcssa:                   ; preds = %._crit_edge.loopexit.unr-lcssa.loopexit, %.lr.ph.preheader
  %.110.lcssa.ph = phi i32 [ poison, %.lr.ph.preheader ], [ %.110.1, %._crit_edge.loopexit.unr-lcssa.loopexit ]
  %indvars.iv.unr = phi i64 [ 1, %.lr.ph.preheader ], [ %indvars.iv.next.1, %._crit_edge.loopexit.unr-lcssa.loopexit ]
  %.014.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %5, %._crit_edge.loopexit.unr-lcssa.loopexit ]
  %.0912.unr = phi i32 [ 0, %.lr.ph.preheader ], [ %.110.1, %._crit_edge.loopexit.unr-lcssa.loopexit ]
  %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
  %6 = getelementptr inbounds [50010 x i32], ptr @a, i64 0, i64 %indvars.iv.unr
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = getelementptr inbounds [50010 x i32], ptr @a, i64 0, i64 %.014.unr
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = sub nsw i32 %7, %9
  %11 = icmp sgt i32 %10, %0
  %12 = zext i1 %11 to i32
  %.110.epil = add nuw nsw i32 %.0912.unr, %12
  br label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph.epil, %._crit_edge.loopexit.unr-lcssa, %1
  %.09.lcssa = phi i32 [ 0, %1 ], [ %.110.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %.110.epil, %.lr.ph.epil ]
  %13 = load i32, ptr @m, align 4, !tbaa !5
  %14 = icmp sle i32 %.09.lcssa, %13
  ret i1 %14

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 1, %.lr.ph.preheader.new ], [ %indvars.iv.next.1, %.lr.ph ]
  %.014 = phi i32 [ 0, %.lr.ph.preheader.new ], [ %.1.1, %.lr.ph ]
  %.0912 = phi i32 [ 0, %.lr.ph.preheader.new ], [ %.110.1, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %.lr.ph ]
  %15 = getelementptr inbounds [50010 x i32], ptr @a, i64 0, i64 %indvars.iv
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = sext i32 %.014 to i64
  %18 = getelementptr inbounds [50010 x i32], ptr @a, i64 0, i64 %17
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %20 = sub nsw i32 %16, %19
  %21 = icmp sgt i32 %20, %0
  %22 = zext i1 %21 to i32
  %.110 = add nuw nsw i32 %.0912, %22
  %23 = trunc i64 %indvars.iv to i32
  %24 = add nsw i32 %23, -1
  %.1 = select i1 %21, i32 %24, i32 %.014
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %25 = getelementptr inbounds [50010 x i32], ptr @a, i64 0, i64 %indvars.iv.next
  %26 = load i32, ptr %25, align 4, !tbaa !5
  %27 = sext i32 %.1 to i64
  %28 = getelementptr inbounds [50010 x i32], ptr @a, i64 0, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !5
  %30 = sub nsw i32 %26, %29
  %31 = icmp sgt i32 %30, %0
  %32 = zext i1 %31 to i32
  %.110.1 = add nuw nsw i32 %.110, %32
  %33 = trunc i64 %indvars.iv.next to i32
  %34 = add i32 %33, -1
  %.1.1 = select i1 %31, i32 %34, i32 %.1
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %niter.next.1 = add i64 %niter, 2
  %niter.ncmp.1 = icmp eq i64 %niter.next.1, %unroll_iter
  br i1 %niter.ncmp.1, label %._crit_edge.loopexit.unr-lcssa.loopexit, label %.lr.ph, !llvm.loop !9
}

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, !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: GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass