; LLVM IR from reyadussalahin/problem-solving :: data_structure/stack/codeforces/F5C (Solution)

; 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.1 = external hidden unnamed_addr constant [6 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local i32 @cpop() #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @longest_sequence() #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: nounwind uwtable
define dso_local 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
  store i32 0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  %5 = call i32 @longest_sequence()
  %6 = call i32 @cpop()
  store i32 %6, ptr %3, align 4, !tbaa !5
  store i32 1, ptr %4, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %25, %0
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = icmp ne i32 %8, -1
  br i1 %9, label %10, label %27

10:                                               ; preds = %7
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = icmp sgt i32 %11, %12
  br i1 %13, label %14, label %16

14:                                               ; preds = %10
  %15 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %15, ptr %2, align 4, !tbaa !5
  store i32 1, ptr %4, align 4, !tbaa !5
  br label %24

16:                                               ; preds = %10
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = load i32, ptr %2, align 4, !tbaa !5
  %19 = icmp eq i32 %17, %18
  br i1 %19, label %20, label %23

20:                                               ; preds = %16
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = add nsw i32 %21, 1
  store i32 %22, ptr %4, align 4, !tbaa !5
  br label %23

23:                                               ; preds = %20, %16
  br label %24

24:                                               ; preds = %23, %14
  br label %25

25:                                               ; preds = %24
  %26 = call i32 @cpop()
  store i32 %26, ptr %3, align 4, !tbaa !5
  br label %7, !llvm.loop !9

27:                                               ; preds = %7
  %28 = load i32, ptr %2, align 4, !tbaa !5
  %29 = load i32, ptr %4, align 4, !tbaa !5
  %30 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %28, i32 noundef %29)
  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
}

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

attributes #0 = { 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 = { "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/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.1 = external hidden unnamed_addr constant [6 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local i32 @cpop() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @longest_sequence() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = tail call i32 @longest_sequence()
  %2 = tail call i32 @cpop()
  %.not12 = icmp eq i32 %2, -1
  br i1 %.not12, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.lr.ph
  %.015 = phi i32 [ %.1, %.lr.ph ], [ 1, %0 ]
  %.0914 = phi i32 [ %6, %.lr.ph ], [ %2, %0 ]
  %.01013 = phi i32 [ %.111, %.lr.ph ], [ 0, %0 ]
  %3 = icmp sgt i32 %.0914, %.01013
  %4 = icmp eq i32 %.0914, %.01013
  %5 = zext i1 %4 to i32
  %spec.select = add nsw i32 %.015, %5
  %.111 = tail call i32 @llvm.smax.i32(i32 %.0914, i32 %.01013)
  %.1 = select i1 %3, i32 1, i32 %spec.select
  %6 = tail call i32 @cpop()
  %.not = icmp eq i32 %6, -1
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5

._crit_edge:                                      ; preds = %.lr.ph, %0
  %.010.lcssa = phi i32 [ 0, %0 ], [ %.111, %.lr.ph ]
  %.0.lcssa = phi i32 [ 1, %0 ], [ %.1, %.lr.ph ]
  %7 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %.010.lcssa, i32 noundef %.0.lcssa)
  ret i32 0
}

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #2

attributes #0 = { 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 = { 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 #2 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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