; LLVM IR from AlgoGenesis/C :: Queue/Queue Lazy Transfer using Stack (program)

; 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 { ptr, ptr }

; Function Attrs: nounwind uwtable
declare dso_local zeroext i1 @isEmpty(ptr noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local void @push(ptr noundef, i32 noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @pop(ptr noundef) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @dequeue(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %4 = getelementptr inbounds %struct.Queue, ptr %3, i32 0, i32 1
  %5 = load ptr, ptr %4, align 8, !tbaa !9
  %6 = call zeroext i1 @isEmpty(ptr noundef %5)
  br i1 %6, label %7, label %23

7:                                                ; preds = %1
  br label %8

8:                                                ; preds = %14, %7
  %9 = load ptr, ptr %2, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.Queue, ptr %9, i32 0, i32 0
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  %12 = call zeroext i1 @isEmpty(ptr noundef %11)
  %13 = xor i1 %12, true
  br i1 %13, label %14, label %22

14:                                               ; preds = %8
  %15 = load ptr, ptr %2, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.Queue, ptr %15, i32 0, i32 1
  %17 = load ptr, ptr %16, align 8, !tbaa !9
  %18 = load ptr, ptr %2, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.Queue, ptr %18, i32 0, i32 0
  %20 = load ptr, ptr %19, align 8, !tbaa !11
  %21 = call i32 @pop(ptr noundef %20)
  call void @push(ptr noundef %17, i32 noundef %21)
  br label %8, !llvm.loop !12

22:                                               ; preds = %8
  br label %23

23:                                               ; preds = %22, %1
  %24 = load ptr, ptr %2, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.Queue, ptr %24, i32 0, i32 1
  %26 = load ptr, ptr %25, align 8, !tbaa !9
  %27 = call i32 @pop(ptr noundef %26)
  ret i32 %27
}

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, !6, i64 8}
!10 = !{!"", !6, i64 0, !6, i64 8}
!11 = !{!10, !6, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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"

; Function Attrs: nounwind uwtable
declare dso_local zeroext i1 @isEmpty(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @push(ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @pop(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local i32 @dequeue(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 8
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %4 = tail call zeroext i1 @isEmpty(ptr noundef %3)
  br i1 %4, label %.preheader, label %.loopexit

.preheader:                                       ; preds = %1
  %5 = load ptr, ptr %0, align 8, !tbaa !10
  %6 = tail call zeroext i1 @isEmpty(ptr noundef %5)
  br i1 %6, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  %8 = load ptr, ptr %0, align 8, !tbaa !10
  %9 = tail call i32 @pop(ptr noundef %8)
  tail call void @push(ptr noundef %7, i32 noundef %9)
  %10 = load ptr, ptr %0, align 8, !tbaa !10
  %11 = tail call zeroext i1 @isEmpty(ptr noundef %10)
  br i1 %11, label %.loopexit, label %.lr.ph, !llvm.loop !11

.loopexit:                                        ; preds = %.lr.ph, %.preheader, %1
  %12 = load ptr, ptr %2, align 8, !tbaa !5
  %13 = tail call i32 @pop(ptr noundef %12)
  ret i32 %13
}

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, !7, i64 8}
!6 = !{!"", !7, i64 0, !7, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!6, !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass