; LLVM IR from codeIIEST/Algorithms :: Competitive Coding/Graphs/Topological Sort/topological.ll (Z3delv)

; 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"

@queue = external dso_local global [100 x i32], align 16
@front = external dso_local global i32, align 4
@rear = external dso_local global i32, align 4
@.str.5 = external hidden unnamed_addr constant [17 x i8], align 1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z3delv() #1 {
  %1 = alloca i32, align 4
  %2 = load i32, ptr @front, align 4, !tbaa !5
  %3 = icmp eq i32 %2, -1
  br i1 %3, label %8, label %4

4:                                                ; preds = %0
  %5 = load i32, ptr @front, align 4, !tbaa !5
  %6 = load i32, ptr @rear, align 4, !tbaa !5
  %7 = icmp sgt i32 %5, %6
  br i1 %7, label %8, label %10

8:                                                ; preds = %4, %0
  %9 = call i32 (ptr, ...) @printf(ptr noundef @.str.5)
  call void @exit(i32 noundef 1) #4
  unreachable

10:                                               ; preds = %4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #5
  %11 = load i32, ptr @front, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds [100 x i32], ptr @queue, i64 0, i64 %12
  %14 = load i32, ptr %13, align 4, !tbaa !5
  store i32 %14, ptr %1, align 4, !tbaa !5
  %15 = load i32, ptr @front, align 4, !tbaa !5
  %16 = add nsw i32 %15, 1
  store i32 %16, ptr @front, align 4, !tbaa !5
  %17 = load i32, ptr %1, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #5
  ret i32 %17
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

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

; Function Attrs: noreturn nounwind
declare void @exit(i32 noundef) #3

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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" }
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 = { noreturn 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 = { noreturn nounwind }
attributes #5 = { 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"}


; 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"

@queue = external dso_local local_unnamed_addr global [100 x i32], align 16
@front = external dso_local local_unnamed_addr global i32, align 4
@rear = external dso_local local_unnamed_addr global i32, align 4
@.str.5 = external hidden unnamed_addr constant [17 x i8], align 1

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z3delv() local_unnamed_addr #0 {
  %1 = load i32, ptr @front, align 4, !tbaa !5
  %2 = icmp eq i32 %1, -1
  %3 = load i32, ptr @rear, align 4
  %4 = icmp sgt i32 %1, %3
  %or.cond = select i1 %2, i1 true, i1 %4
  br i1 %or.cond, label %5, label %7

5:                                                ; preds = %0
  %6 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.5)
  tail call void @exit(i32 noundef 1) #3
  unreachable

7:                                                ; preds = %0
  %8 = sext i32 %1 to i64
  %9 = getelementptr inbounds [100 x i32], ptr @queue, i64 0, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = add nuw nsw i32 %1, 1
  store i32 %11, ptr @front, align 4, !tbaa !5
  ret i32 %10
}

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

; Function Attrs: noreturn nounwind
declare void @exit(i32 noundef) local_unnamed_addr #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 = { 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 = { noreturn 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 = { noreturn 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"}


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