; LLVM IR from MostafaTwfiq/C-DataStructures-And-Algorithms :: DataStructure/Queues/Sources (StackQueue)

; 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"

declare void @stackPush(ptr noundef, ptr noundef) #0

declare signext i16 @stackIsEmpty(ptr noundef) #0

; Function Attrs: nounwind uwtable
define dso_local void @transferItemsToSecondStack(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  br label %5

5:                                                ; preds = %10, %2
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = call signext i16 @stackIsEmpty(ptr noundef %6)
  %8 = icmp ne i16 %7, 0
  %9 = xor i1 %8, true
  br i1 %9, label %10, label %14

10:                                               ; preds = %5
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = call ptr @stackPop(ptr noundef %12)
  call void @stackPush(ptr noundef %11, ptr noundef %13)
  br label %5, !llvm.loop !9

14:                                               ; preds = %5
  ret void
}

declare ptr @stackPop(ptr noundef) #0

attributes #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 = { 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 = 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"

declare void @stackPush(ptr noundef, ptr noundef) local_unnamed_addr #0

declare signext i16 @stackIsEmpty(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @transferItemsToSecondStack(ptr noundef %0, ptr noundef %1) local_unnamed_addr #1 {
  %3 = tail call signext i16 @stackIsEmpty(ptr noundef %0) #2
  %.not3 = icmp eq i16 %3, 0
  br i1 %.not3, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2, %.lr.ph
  %4 = tail call ptr @stackPop(ptr noundef %0) #2
  tail call void @stackPush(ptr noundef %1, ptr noundef %4) #2
  %5 = tail call signext i16 @stackIsEmpty(ptr noundef %0) #2
  %.not = icmp eq i16 %5, 0
  br i1 %.not, label %.lr.ph, label %._crit_edge, !llvm.loop !5

._crit_edge:                                      ; preds = %.lr.ph, %2
  ret void
}

declare ptr @stackPop(ptr noundef) local_unnamed_addr #0

attributes #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 = { 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 #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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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