; LLVM IR from Dev-XYS/Algorithms :: Stack (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 hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [7 x i8], align 1
@.str.6 = external hidden unnamed_addr constant [6 x i8], align 1
@.str.7 = external hidden unnamed_addr constant [22 x i8], align 1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z4pushi(i32 noundef) #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z3popv() #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7get_maxv() #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #1 {
  %1 = alloca i32, align 4
  %2 = alloca [10 x i8], align 1
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  br label %5

5:                                                ; preds = %41, %0
  call void @llvm.lifetime.start.p0(i64 10, ptr %2) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #5
  %6 = getelementptr inbounds [10 x i8], ptr %2, i64 0, i64 0
  %7 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %6)
  %8 = getelementptr inbounds [10 x i8], ptr %2, i64 0, i64 0
  %9 = call i32 @strcmp(ptr noundef %8, ptr noundef @.str.1) #6
  %10 = icmp eq i32 %9, 0
  br i1 %10, label %11, label %14

11:                                               ; preds = %5
  %12 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.2, ptr noundef %3)
  %13 = load i32, ptr %3, align 4, !tbaa !5
  call void @_Z4pushi(i32 noundef %13)
  br label %38

14:                                               ; preds = %5
  %15 = getelementptr inbounds [10 x i8], ptr %2, i64 0, i64 0
  %16 = call i32 @strcmp(ptr noundef %15, ptr noundef @.str.3) #6
  %17 = icmp eq i32 %16, 0
  br i1 %17, label %18, label %21

18:                                               ; preds = %14
  %19 = call noundef i32 @_Z3popv()
  %20 = call i32 (ptr, ...) @printf(ptr noundef @.str.4, i32 noundef %19)
  br label %37

21:                                               ; preds = %14
  %22 = getelementptr inbounds [10 x i8], ptr %2, i64 0, i64 0
  %23 = call i32 @strcmp(ptr noundef %22, ptr noundef @.str.5) #6
  %24 = icmp eq i32 %23, 0
  br i1 %24, label %25, label %28

25:                                               ; preds = %21
  %26 = call noundef i32 @_Z7get_maxv()
  %27 = call i32 (ptr, ...) @printf(ptr noundef @.str.4, i32 noundef %26)
  br label %36

28:                                               ; preds = %21
  %29 = getelementptr inbounds [10 x i8], ptr %2, i64 0, i64 0
  %30 = call i32 @strcmp(ptr noundef %29, ptr noundef @.str.6) #6
  %31 = icmp eq i32 %30, 0
  br i1 %31, label %32, label %33

32:                                               ; preds = %28
  store i32 0, ptr %1, align 4
  store i32 1, ptr %4, align 4
  br label %39

33:                                               ; preds = %28
  %34 = call i32 (ptr, ...) @printf(ptr noundef @.str.7)
  br label %35

35:                                               ; preds = %33
  br label %36

36:                                               ; preds = %35, %25
  br label %37

37:                                               ; preds = %36, %18
  br label %38

38:                                               ; preds = %37, %11
  store i32 0, ptr %4, align 4
  br label %39

39:                                               ; preds = %38, %32
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #5
  call void @llvm.lifetime.end.p0(i64 10, ptr %2) #5
  %40 = load i32, ptr %4, align 4
  switch i32 %40, label %44 [
    i32 0, label %41
    i32 1, label %42
  ]

41:                                               ; preds = %39
  br label %5, !llvm.loop !9

42:                                               ; preds = %39
  %43 = load i32, ptr %1, align 4
  ret i32 %43

44:                                               ; preds = %39
  unreachable
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

declare i32 @__isoc99_scanf(ptr noundef, ...) #3

; Function Attrs: nounwind willreturn memory(read)
declare i32 @strcmp(ptr noundef, ptr noundef) #4

declare i32 @printf(ptr noundef, ...) #3

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

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 = { 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 #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { "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 willreturn memory(read) "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 #5 = { nounwind }
attributes #6 = { nounwind willreturn memory(read) }

!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"

@.str = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [7 x i8], align 1
@.str.6 = external hidden unnamed_addr constant [6 x i8], align 1
@.str.7 = external hidden unnamed_addr constant [22 x i8], align 1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z4pushi(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z3popv() local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z7get_maxv() local_unnamed_addr #0

; Function Attrs: mustprogress norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #1 {
  %1 = alloca [10 x i8], align 1
  %2 = alloca i32, align 4
  br label %3

3:                                                ; preds = %27, %0
  call void @llvm.lifetime.start.p0(i64 10, ptr nonnull %1) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #5
  %4 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1)
  %5 = call i32 @strcmp(ptr noundef nonnull dereferenceable(1) %1, ptr noundef nonnull dereferenceable(1) @.str.1) #6
  %6 = icmp eq i32 %5, 0
  br i1 %6, label %7, label %10

7:                                                ; preds = %3
  %8 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.2, ptr noundef nonnull %2)
  %9 = load i32, ptr %2, align 4, !tbaa !5
  call void @_Z4pushi(i32 noundef %9)
  br label %27

10:                                               ; preds = %3
  %11 = call i32 @strcmp(ptr noundef nonnull dereferenceable(1) %1, ptr noundef nonnull dereferenceable(1) @.str.3) #6
  %12 = icmp eq i32 %11, 0
  br i1 %12, label %13, label %16

13:                                               ; preds = %10
  %14 = call noundef i32 @_Z3popv()
  %15 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.4, i32 noundef %14)
  br label %27

16:                                               ; preds = %10
  %17 = call i32 @strcmp(ptr noundef nonnull dereferenceable(1) %1, ptr noundef nonnull dereferenceable(1) @.str.5) #6
  %18 = icmp eq i32 %17, 0
  br i1 %18, label %19, label %22

19:                                               ; preds = %16
  %20 = call noundef i32 @_Z7get_maxv()
  %21 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.4, i32 noundef %20)
  br label %27

22:                                               ; preds = %16
  %23 = call i32 @strcmp(ptr noundef nonnull dereferenceable(1) %1, ptr noundef nonnull dereferenceable(1) @.str.6) #6
  %24 = icmp eq i32 %23, 0
  br i1 %24, label %28, label %25

25:                                               ; preds = %22
  %26 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.7)
  br label %27

27:                                               ; preds = %7, %19, %25, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #5
  call void @llvm.lifetime.end.p0(i64 10, ptr nonnull %1) #5
  br label %3

28:                                               ; preds = %22
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #5
  call void @llvm.lifetime.end.p0(i64 10, ptr nonnull %1) #5
  ret i32 0
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare i32 @strcmp(ptr nocapture noundef, ptr nocapture noundef) local_unnamed_addr #4

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

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 = { 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 #2 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 #4 = { mustprogress nofree nounwind willreturn memory(argmem: read) "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 #5 = { nounwind }
attributes #6 = { nounwind willreturn memory(read) }

!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"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass