; LLVM IR from Muhammad-Magdi/problem-solving :: DSU (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"

@n = external dso_local global i32, align 4
@q = external dso_local global i32, align 4
@t = external dso_local global i32, align 4
@a = external dso_local global i32, align 4
@b = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [6 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [9 x i8], align 1
@.str.2 = 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
  store i32 0, ptr %1, align 4
  %2 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n, ptr noundef @q)
  call void @_Z4initv()
  br label %3

3:                                                ; preds = %20, %0
  %4 = load i32, ptr @q, align 4, !tbaa !5
  %5 = add nsw i32 %4, -1
  store i32 %5, ptr @q, align 4, !tbaa !5
  %6 = icmp ne i32 %4, 0
  br i1 %6, label %7, label %21

7:                                                ; preds = %3
  %8 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef @t, ptr noundef @a, ptr noundef @b)
  %9 = load i32, ptr @t, align 4, !tbaa !5
  %10 = icmp ne i32 %9, 0
  br i1 %10, label %11, label %14

11:                                               ; preds = %7
  %12 = load i32, ptr @a, align 4, !tbaa !5
  %13 = load i32, ptr @b, align 4, !tbaa !5
  call void @_Z5mergeii(i32 noundef %12, i32 noundef %13)
  br label %20

14:                                               ; preds = %7
  %15 = load i32, ptr @a, align 4, !tbaa !5
  %16 = load i32, ptr @b, align 4, !tbaa !5
  %17 = call noundef zeroext i1 @_Z7sameSetii(i32 noundef %15, i32 noundef %16)
  %18 = zext i1 %17 to i32
  %19 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %18)
  br label %20

20:                                               ; preds = %14, %11
  br label %3, !llvm.loop !9

21:                                               ; preds = %3
  ret i32 0
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #1

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_Z4initv() #2

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_Z5mergeii(i32 noundef, i32 noundef) #2

declare i32 @printf(ptr noundef, ...) #1

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef zeroext i1 @_Z7sameSetii(i32 noundef, i32 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 = { "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 = { inlinehint mustprogress 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"}


; 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 global i32, align 4
@q = external dso_local global i32, align 4
@t = external dso_local global i32, align 4
@a = external dso_local global i32, align 4
@b = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [6 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [9 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n, ptr noundef nonnull @q)
  tail call void @_Z4initv()
  %2 = load i32, ptr @q, align 4, !tbaa !5
  %3 = add nsw i32 %2, -1
  store i32 %3, ptr @q, align 4, !tbaa !5
  %.not2 = icmp eq i32 %2, 0
  br i1 %.not2, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %13
  %4 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull @t, ptr noundef nonnull @a, ptr noundef nonnull @b)
  %5 = load i32, ptr @t, align 4, !tbaa !5
  %.not1 = icmp eq i32 %5, 0
  %6 = load i32, ptr @a, align 4, !tbaa !5
  %7 = load i32, ptr @b, align 4, !tbaa !5
  br i1 %.not1, label %9, label %8

8:                                                ; preds = %.lr.ph
  tail call void @_Z5mergeii(i32 noundef %6, i32 noundef %7)
  br label %13

9:                                                ; preds = %.lr.ph
  %10 = tail call noundef zeroext i1 @_Z7sameSetii(i32 noundef %6, i32 noundef %7)
  %11 = zext i1 %10 to i32
  %12 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %11)
  br label %13

13:                                               ; preds = %9, %8
  %14 = load i32, ptr @q, align 4, !tbaa !5
  %15 = add nsw i32 %14, -1
  store i32 %15, ptr @q, align 4, !tbaa !5
  %.not = icmp eq i32 %14, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %13, %0
  ret i32 0
}

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_Z4initv() local_unnamed_addr #2

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_Z5mergeii(i32 noundef, i32 noundef) local_unnamed_addr #2

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

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef zeroext i1 @_Z7sameSetii(i32 noundef, i32 noundef) local_unnamed_addr #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 = { 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 = { inlinehint mustprogress 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: GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass