; LLVM IR from AllAlgorithms/c :: algorithms/queue (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"

%struct.queue = type { i32, i32, ptr, ptr }
%struct.queue_node = type { ptr, ptr }

; Function Attrs: nounwind uwtable
define dso_local i32 @queue_enqueue(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %6 = load ptr, ptr %4, align 8, !tbaa !5
  %7 = getelementptr inbounds %struct.queue, ptr %6, i32 0, i32 1
  %8 = load i32, ptr %7, align 4, !tbaa !9
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.queue, ptr %9, i32 0, i32 0
  %11 = load i32, ptr %10, align 8, !tbaa !12
  %12 = icmp eq i32 %8, %11
  br i1 %12, label %13, label %14

13:                                               ; preds = %2
  store i32 -1, ptr %3, align 4
  br label %44

14:                                               ; preds = %2
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.queue, ptr %15, i32 0, i32 2
  %17 = load ptr, ptr %16, align 8, !tbaa !13
  %18 = icmp eq ptr %17, null
  br i1 %18, label %19, label %30

19:                                               ; preds = %14
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.queue, ptr %20, i32 0, i32 3
  %22 = load ptr, ptr %21, align 8, !tbaa !14
  %23 = icmp eq ptr %22, null
  br i1 %23, label %24, label %30

24:                                               ; preds = %19
  %25 = load ptr, ptr %5, align 8, !tbaa !5
  %26 = load ptr, ptr %4, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.queue, ptr %26, i32 0, i32 3
  store ptr %25, ptr %27, align 8, !tbaa !14
  %28 = load ptr, ptr %4, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.queue, ptr %28, i32 0, i32 2
  store ptr %25, ptr %29, align 8, !tbaa !13
  br label %39

30:                                               ; preds = %19, %14
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = load ptr, ptr %4, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.queue, ptr %32, i32 0, i32 3
  %34 = load ptr, ptr %33, align 8, !tbaa !14
  %35 = getelementptr inbounds %struct.queue_node, ptr %34, i32 0, i32 1
  store ptr %31, ptr %35, align 8, !tbaa !15
  %36 = load ptr, ptr %5, align 8, !tbaa !5
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = getelementptr inbounds %struct.queue, ptr %37, i32 0, i32 3
  store ptr %36, ptr %38, align 8, !tbaa !14
  br label %39

39:                                               ; preds = %30, %24
  %40 = load ptr, ptr %4, align 8, !tbaa !5
  %41 = getelementptr inbounds %struct.queue, ptr %40, i32 0, i32 1
  %42 = load i32, ptr %41, align 4, !tbaa !9
  %43 = add i32 %42, 1
  store i32 %43, ptr %41, align 4, !tbaa !9
  store i32 0, ptr %3, align 4
  br label %44

44:                                               ; preds = %39, %13
  %45 = load i32, ptr %3, align 4
  ret i32 %45
}

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" }

!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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !11, i64 4}
!10 = !{!"queue", !11, i64 0, !11, i64 4, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !11, i64 0}
!13 = !{!10, !6, i64 8}
!14 = !{!10, !6, i64 16}
!15 = !{!16, !6, i64 8}
!16 = !{!"queue_node", !6, i64 0, !6, i64 8}


; 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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(write, argmem: readwrite, inaccessiblemem: none) uwtable
define dso_local range(i32 -1, 1) i32 @queue_enqueue(ptr nocapture noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i8, ptr %0, i64 4
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = load i32, ptr %0, align 8, !tbaa !11
  %6 = icmp eq i32 %4, %5
  br i1 %6, label %17, label %7

7:                                                ; preds = %2
  %8 = getelementptr inbounds i8, ptr %0, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !12
  %10 = icmp eq ptr %9, null
  %11 = getelementptr inbounds i8, ptr %0, i64 16
  %12 = load ptr, ptr %11, align 8, !tbaa !13
  %13 = icmp eq ptr %12, null
  %or.cond = select i1 %10, i1 %13, i1 false
  %14 = getelementptr inbounds i8, ptr %0, i64 16
  %15 = getelementptr inbounds i8, ptr %12, i64 8
  %.sink12 = select i1 %or.cond, ptr %11, ptr %15
  %.sink = select i1 %or.cond, ptr %8, ptr %14
  store ptr %1, ptr %.sink12, align 8, !tbaa !14
  store ptr %1, ptr %.sink, align 8, !tbaa !14
  %16 = add i32 %4, 1
  store i32 %16, ptr %3, align 4, !tbaa !5
  br label %17

17:                                               ; preds = %2, %7
  %.0 = phi i32 [ 0, %7 ], [ -1, %2 ]
  ret i32 %.0
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(write, argmem: 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, !7, i64 4}
!6 = !{!"queue", !7, i64 0, !7, i64 4, !10, i64 8, !10, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !7, i64 0}
!12 = !{!6, !10, i64 8}
!13 = !{!6, !10, i64 16}
!14 = !{!10, !10, i64 0}


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