; LLVM IR from Shah-Shishir/Codeforces-Solutions :: 1216A. Prefixes (main)

; 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"

@str = external dso_local global [200005 x i8], align 16
@.str = external hidden unnamed_addr constant [6 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [7 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
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  br label %5

5:                                                ; preds = %65, %0
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %2, ptr noundef @str)
  %7 = icmp ne i32 %6, -1
  br i1 %7, label %8, label %68

8:                                                ; preds = %5
  store i32 0, ptr %4, align 4, !tbaa !5
  store i32 0, ptr %3, align 4, !tbaa !5
  br label %9

9:                                                ; preds = %62, %8
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = icmp slt i32 %10, %11
  br i1 %12, label %13, label %65

13:                                               ; preds = %9
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [200005 x i8], ptr @str, i64 0, i64 %15
  %17 = load i8, ptr %16, align 1, !tbaa !9
  %18 = sext i8 %17 to i32
  %19 = icmp eq i32 %18, 97
  br i1 %19, label %20, label %28

20:                                               ; preds = %13
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = add nsw i32 %21, 1
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds [200005 x i8], ptr @str, i64 0, i64 %23
  %25 = load i8, ptr %24, align 1, !tbaa !9
  %26 = sext i8 %25 to i32
  %27 = icmp eq i32 %26, 98
  br i1 %27, label %61, label %28

28:                                               ; preds = %20, %13
  %29 = load i32, ptr %3, align 4, !tbaa !5
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds [200005 x i8], ptr @str, i64 0, i64 %30
  %32 = load i8, ptr %31, align 1, !tbaa !9
  %33 = sext i8 %32 to i32
  %34 = icmp eq i32 %33, 98
  br i1 %34, label %35, label %43

35:                                               ; preds = %28
  %36 = load i32, ptr %3, align 4, !tbaa !5
  %37 = add nsw i32 %36, 1
  %38 = sext i32 %37 to i64
  %39 = getelementptr inbounds [200005 x i8], ptr @str, i64 0, i64 %38
  %40 = load i8, ptr %39, align 1, !tbaa !9
  %41 = sext i8 %40 to i32
  %42 = icmp eq i32 %41, 97
  br i1 %42, label %61, label %43

43:                                               ; preds = %35, %28
  %44 = load i32, ptr %3, align 4, !tbaa !5
  %45 = sext i32 %44 to i64
  %46 = getelementptr inbounds [200005 x i8], ptr @str, i64 0, i64 %45
  %47 = load i8, ptr %46, align 1, !tbaa !9
  %48 = sext i8 %47 to i32
  %49 = icmp eq i32 %48, 97
  br i1 %49, label %50, label %54

50:                                               ; preds = %43
  %51 = load i32, ptr %3, align 4, !tbaa !5
  %52 = sext i32 %51 to i64
  %53 = getelementptr inbounds [200005 x i8], ptr @str, i64 0, i64 %52
  store i8 98, ptr %53, align 1, !tbaa !9
  br label %58

54:                                               ; preds = %43
  %55 = load i32, ptr %3, align 4, !tbaa !5
  %56 = sext i32 %55 to i64
  %57 = getelementptr inbounds [200005 x i8], ptr @str, i64 0, i64 %56
  store i8 97, ptr %57, align 1, !tbaa !9
  br label %58

58:                                               ; preds = %54, %50
  %59 = load i32, ptr %4, align 4, !tbaa !5
  %60 = add nsw i32 %59, 1
  store i32 %60, ptr %4, align 4, !tbaa !5
  br label %61

61:                                               ; preds = %58, %35, %20
  br label %62

62:                                               ; preds = %61
  %63 = load i32, ptr %3, align 4, !tbaa !5
  %64 = add nsw i32 %63, 2
  store i32 %64, ptr %3, align 4, !tbaa !5
  br label %9, !llvm.loop !10

65:                                               ; preds = %9
  %66 = load i32, ptr %4, align 4, !tbaa !5
  %67 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %66, ptr noundef @str)
  br label %5, !llvm.loop !12

68:                                               ; preds = %5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  ret i32 0
}

; 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

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

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

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 = { 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"

@str = external dso_local global [200005 x i8], align 16
@.str = external hidden unnamed_addr constant [6 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [7 x i8], align 1

; Function Attrs: mustprogress nofree norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #3
  %2 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1, ptr noundef nonnull @str)
  %.not14 = icmp eq i32 %2, -1
  br i1 %.not14, label %._crit_edge15, label %.preheader

.preheader:                                       ; preds = %0, %._crit_edge
  %3 = load i32, ptr %1, align 4, !tbaa !5
  %4 = icmp sgt i32 %3, 0
  br i1 %4, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %.preheader
  %5 = zext nneg i32 %3 to i64
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %19
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %19 ]
  %.013 = phi i32 [ 0, %.lr.ph.preheader ], [ %.1, %19 ]
  %6 = getelementptr inbounds [200005 x i8], ptr @str, i64 0, i64 %indvars.iv
  %7 = load i8, ptr %6, align 2, !tbaa !9
  switch i8 %7, label %.thread [
    i8 97, label %8
    i8 98, label %13
  ]

8:                                                ; preds = %.lr.ph
  %9 = or disjoint i64 %indvars.iv, 1
  %10 = getelementptr inbounds [200005 x i8], ptr @str, i64 0, i64 %9
  %11 = load i8, ptr %10, align 1, !tbaa !9
  %12 = icmp eq i8 %11, 98
  br i1 %12, label %19, label %.thread

13:                                               ; preds = %.lr.ph
  %14 = or disjoint i64 %indvars.iv, 1
  %15 = getelementptr inbounds [200005 x i8], ptr @str, i64 0, i64 %14
  %16 = load i8, ptr %15, align 1, !tbaa !9
  %17 = icmp eq i8 %16, 97
  br i1 %17, label %19, label %.thread

.thread:                                          ; preds = %.lr.ph, %8, %13
  %. = phi i8 [ 98, %8 ], [ 97, %13 ], [ 97, %.lr.ph ]
  store i8 %., ptr %6, align 2, !tbaa !9
  %18 = add nsw i32 %.013, 1
  br label %19

19:                                               ; preds = %8, %13, %.thread
  %.1 = phi i32 [ %.013, %8 ], [ %.013, %13 ], [ %18, %.thread ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
  %20 = icmp ult i64 %indvars.iv.next, %5
  br i1 %20, label %.lr.ph, label %._crit_edge, !llvm.loop !10

._crit_edge:                                      ; preds = %19, %.preheader
  %.0.lcssa = phi i32 [ 0, %.preheader ], [ %.1, %19 ]
  %21 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %.0.lcssa, ptr noundef nonnull @str)
  %22 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1, ptr noundef nonnull @str)
  %.not = icmp eq i32 %22, -1
  br i1 %.not, label %._crit_edge15, label %.preheader, !llvm.loop !12

._crit_edge15:                                    ; preds = %._crit_edge, %0
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #3
  ret i32 0
}

; 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: nofree nounwind
declare noundef i32 @printf(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

attributes #0 = { mustprogress nofree 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 = { 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}


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