; LLVM IR from tangjz/acm-icpc :: leetcode/extra (DD_2020003-地砖染色)

; 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"

@_ZZ4mainE3buf = external hidden global [10001 x i8], align 16
@.str = external hidden unnamed_addr constant [7 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i8, align 1
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #4
  %9 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %2, ptr noundef %3, ptr noundef @_ZZ4mainE3buf)
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #4
  %10 = load i32, ptr %2, align 4, !tbaa !5
  store i32 %10, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr %5) #4
  store i8 97, ptr %5, align 1, !tbaa !9
  br label %11

11:                                               ; preds = %44, %0
  %12 = load i8, ptr %5, align 1, !tbaa !9
  %13 = sext i8 %12 to i32
  %14 = icmp sle i32 %13, 122
  br i1 %14, label %16, label %15

15:                                               ; preds = %11
  store i32 2, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 1, ptr %5) #4
  br label %47

16:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  store i32 0, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #4
  store i32 0, ptr %8, align 4, !tbaa !5
  br label %17

17:                                               ; preds = %40, %16
  %18 = load i32, ptr %8, align 4, !tbaa !5
  %19 = load i32, ptr %2, align 4, !tbaa !5
  %20 = icmp slt i32 %18, %19
  br i1 %20, label %22, label %21

21:                                               ; preds = %17
  store i32 5, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #4
  br label %41

22:                                               ; preds = %17
  %23 = load i32, ptr %8, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [10001 x i8], ptr @_ZZ4mainE3buf, i64 0, i64 %24
  %26 = load i8, ptr %25, align 1, !tbaa !9
  %27 = sext i8 %26 to i32
  %28 = load i8, ptr %5, align 1, !tbaa !9
  %29 = sext i8 %28 to i32
  %30 = icmp eq i32 %27, %29
  br i1 %30, label %31, label %34

31:                                               ; preds = %22
  %32 = load i32, ptr %8, align 4, !tbaa !5
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr %8, align 4, !tbaa !5
  br label %40

34:                                               ; preds = %22
  %35 = load i32, ptr %7, align 4, !tbaa !5
  %36 = add nsw i32 %35, 1
  store i32 %36, ptr %7, align 4, !tbaa !5
  %37 = load i32, ptr %3, align 4, !tbaa !5
  %38 = load i32, ptr %8, align 4, !tbaa !5
  %39 = add nsw i32 %38, %37
  store i32 %39, ptr %8, align 4, !tbaa !5
  br label %40

40:                                               ; preds = %34, %31
  br label %17, !llvm.loop !10

41:                                               ; preds = %21
  %42 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %4, ptr noundef nonnull align 4 dereferenceable(4) %7)
  %43 = load i32, ptr %42, align 4, !tbaa !5
  store i32 %43, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  br label %44

44:                                               ; preds = %41
  %45 = load i8, ptr %5, align 1, !tbaa !9
  %46 = add i8 %45, 1
  store i8 %46, ptr %5, align 1, !tbaa !9
  br label %11, !llvm.loop !12

47:                                               ; preds = %15
  %48 = load i32, ptr %4, align 4, !tbaa !5
  %49 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %48)
  store i32 0, ptr %1, align 4
  store i32 1, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #4
  %50 = load i32, ptr %1, align 4
  ret i32 %50
}

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

declare i32 @__isoc99_scanf(ptr noundef, ...) #2

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

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #3

declare i32 @printf(ptr noundef, ...) #2

attributes #0 = { mustprogress norecurse 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 = { "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 #3 = { inlinehint 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 #4 = { 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 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}
!12 = distinct !{!12, !11}


; 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"

@_ZZ4mainE3buf = external hidden global [10001 x i8], align 16
@.str = external hidden unnamed_addr constant [7 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #4
  %5 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1, ptr noundef nonnull %2, ptr noundef nonnull @_ZZ4mainE3buf)
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #4
  %6 = load i32, ptr %1, align 4, !tbaa !5
  store i32 %6, ptr %3, align 4, !tbaa !5
  br label %9

7:                                                ; preds = %._crit_edge
  %8 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %14)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #4
  ret i32 0

thread-pre-split:                                 ; preds = %._crit_edge
  %.pr = load i32, ptr %1, align 4, !tbaa !5
  br label %9

9:                                                ; preds = %thread-pre-split, %0
  %10 = phi i32 [ %.pr, %thread-pre-split ], [ %6, %0 ]
  %.0811 = phi i8 [ %15, %thread-pre-split ], [ 97, %0 ]
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #4
  store i32 0, ptr %4, align 4, !tbaa !5
  %11 = icmp sgt i32 %10, 0
  br i1 %11, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %9
  %12 = load i32, ptr %2, align 4
  br label %16

._crit_edge:                                      ; preds = %27, %9
  %13 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %3, ptr noundef nonnull align 4 dereferenceable(4) %4)
  %14 = load i32, ptr %13, align 4, !tbaa !5
  store i32 %14, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #4
  %15 = add nuw nsw i8 %.0811, 1
  %exitcond.not = icmp eq i8 %15, 123
  br i1 %exitcond.not, label %7, label %thread-pre-split, !llvm.loop !9

16:                                               ; preds = %.lr.ph, %27
  %.010 = phi i32 [ 0, %.lr.ph ], [ %.1, %27 ]
  %17 = phi i32 [ 0, %.lr.ph ], [ %28, %27 ]
  %18 = sext i32 %.010 to i64
  %19 = getelementptr inbounds [10001 x i8], ptr @_ZZ4mainE3buf, i64 0, i64 %18
  %20 = load i8, ptr %19, align 1, !tbaa !11
  %21 = icmp eq i8 %20, %.0811
  br i1 %21, label %22, label %24

22:                                               ; preds = %16
  %23 = add nsw i32 %.010, 1
  br label %27

24:                                               ; preds = %16
  %25 = add nsw i32 %17, 1
  store i32 %25, ptr %4, align 4, !tbaa !5
  %26 = add nsw i32 %12, %.010
  br label %27

27:                                               ; preds = %24, %22
  %28 = phi i32 [ %17, %22 ], [ %25, %24 ]
  %.1 = phi i32 [ %23, %22 ], [ %26, %24 ]
  %29 = icmp slt i32 %.1, %10
  br i1 %29, label %16, label %._crit_edge, !llvm.loop !12
}

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

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

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

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #3

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

attributes #0 = { mustprogress norecurse 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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nofree nounwind "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 #3 = { inlinehint 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 #4 = { 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"}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !10}


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