; LLVM IR from bartobri/data-structures-c :: FIFO-queue/array-no-dup-ignore-new (queue)

; 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"

@q = external hidden global ptr, align 8
@N = external hidden global i32, align 4
@head = external hidden global i32, align 4
@tail = external hidden global i32, align 4

; Function Attrs: nounwind uwtable
define dso_local void @QUEUEput(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  %5 = load i32, ptr @head, align 4, !tbaa !5
  store i32 %5, ptr %3, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %20, %1
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = load i32, ptr @tail, align 4, !tbaa !5
  %9 = icmp ne i32 %7, %8
  br i1 %9, label %10, label %25

10:                                               ; preds = %6
  %11 = load ptr, ptr @q, align 8, !tbaa !9
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds i32, ptr %11, i64 %13
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = load i32, ptr %2, align 4, !tbaa !5
  %17 = icmp eq i32 %15, %16
  br i1 %17, label %18, label %19

18:                                               ; preds = %10
  store i32 1, ptr %4, align 4
  br label %35

19:                                               ; preds = %10
  br label %20

20:                                               ; preds = %19
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = add nsw i32 %21, 1
  %23 = load i32, ptr @N, align 4, !tbaa !5
  %24 = srem i32 %22, %23
  store i32 %24, ptr %3, align 4, !tbaa !5
  br label %6, !llvm.loop !11

25:                                               ; preds = %6
  %26 = load i32, ptr %2, align 4, !tbaa !5
  %27 = load ptr, ptr @q, align 8, !tbaa !9
  %28 = load i32, ptr @tail, align 4, !tbaa !5
  %29 = add nsw i32 %28, 1
  store i32 %29, ptr @tail, align 4, !tbaa !5
  %30 = sext i32 %28 to i64
  %31 = getelementptr inbounds i32, ptr %27, i64 %30
  store i32 %26, ptr %31, align 4, !tbaa !5
  %32 = load i32, ptr @tail, align 4, !tbaa !5
  %33 = load i32, ptr @N, align 4, !tbaa !5
  %34 = srem i32 %32, %33
  store i32 %34, ptr @tail, align 4, !tbaa !5
  store i32 0, ptr %4, align 4
  br label %35

35:                                               ; preds = %25, %18
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  %36 = load i32, ptr %4, align 4
  switch i32 %36, label %38 [
    i32 0, label %37
    i32 1, label %37
  ]

37:                                               ; preds = %35, %35
  ret void

38:                                               ; preds = %35
  unreachable
}

; 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

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 = { 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 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

@q = external hidden local_unnamed_addr global ptr, align 8
@N = external hidden local_unnamed_addr global i32, align 4
@head = external hidden local_unnamed_addr global i32, align 4
@tail = external hidden local_unnamed_addr global i32, align 4

; Function Attrs: nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @QUEUEput(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @head, align 4, !tbaa !5
  %3 = load i32, ptr @tail, align 4, !tbaa !5
  %.not7 = icmp eq i32 %2, %3
  %.pre = load ptr, ptr @q, align 8, !tbaa !9
  br i1 %.not7, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1
  %4 = load i32, ptr @N, align 4
  br label %5

5:                                                ; preds = %.lr.ph, %10
  %.08 = phi i32 [ %2, %.lr.ph ], [ %12, %10 ]
  %6 = sext i32 %.08 to i64
  %7 = getelementptr inbounds i32, ptr %.pre, i64 %6
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %9 = icmp eq i32 %8, %0
  br i1 %9, label %.loopexit, label %10

10:                                               ; preds = %5
  %11 = add nsw i32 %.08, 1
  %12 = srem i32 %11, %4
  %.not = icmp eq i32 %12, %3
  br i1 %.not, label %._crit_edge, label %5, !llvm.loop !11

._crit_edge:                                      ; preds = %10, %1
  %13 = add nsw i32 %3, 1
  store i32 %13, ptr @tail, align 4, !tbaa !5
  %14 = sext i32 %3 to i64
  %15 = getelementptr inbounds i32, ptr %.pre, i64 %14
  store i32 %0, ptr %15, align 4, !tbaa !5
  %16 = load i32, ptr @tail, align 4, !tbaa !5
  %17 = load i32, ptr @N, align 4, !tbaa !5
  %18 = srem i32 %16, %17
  store i32 %18, ptr @tail, align 4, !tbaa !5
  br label %.loopexit

.loopexit:                                        ; preds = %5, %._crit_edge
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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