; LLVM IR from xxks-kkk/algo :: stack/2-stack-1-array (twoStacks)

; 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"

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

; 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

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

; Function Attrs: nounwind uwtable
define dso_local ptr @initializeTwoStacks(ptr noundef %0, i32 noundef %1, ptr noundef %2, i32 noundef %3, i32 noundef %4) #0 {
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca ptr, align 8
  %12 = alloca i32, align 4
  store ptr %0, ptr %6, align 8, !tbaa !5
  store i32 %1, ptr %7, align 4, !tbaa !9
  store ptr %2, ptr %8, align 8, !tbaa !5
  store i32 %3, ptr %9, align 4, !tbaa !9
  store i32 %4, ptr %10, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %11) #2
  %13 = load i32, ptr %7, align 4, !tbaa !9
  %14 = load i32, ptr %9, align 4, !tbaa !9
  %15 = add nsw i32 %13, %14
  %16 = load i32, ptr %10, align 4, !tbaa !9
  %17 = add nsw i32 %15, %16
  %18 = call ptr @createTwoStacks(i32 noundef %17)
  store ptr %18, ptr %11, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #2
  store i32 0, ptr %12, align 4, !tbaa !9
  br label %19

19:                                               ; preds = %30, %5
  %20 = load i32, ptr %12, align 4, !tbaa !9
  %21 = load i32, ptr %7, align 4, !tbaa !9
  %22 = icmp slt i32 %20, %21
  br i1 %22, label %23, label %33

23:                                               ; preds = %19
  %24 = load ptr, ptr %6, align 8, !tbaa !5
  %25 = load i32, ptr %12, align 4, !tbaa !9
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds i32, ptr %24, i64 %26
  %28 = load i32, ptr %27, align 4, !tbaa !9
  %29 = load ptr, ptr %11, align 8, !tbaa !5
  call void @push(i32 noundef %28, i32 noundef 1, ptr noundef %29)
  br label %30

30:                                               ; preds = %23
  %31 = load i32, ptr %12, align 4, !tbaa !9
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %12, align 4, !tbaa !9
  br label %19, !llvm.loop !11

33:                                               ; preds = %19
  store i32 0, ptr %12, align 4, !tbaa !9
  br label %34

34:                                               ; preds = %45, %33
  %35 = load i32, ptr %12, align 4, !tbaa !9
  %36 = load i32, ptr %9, align 4, !tbaa !9
  %37 = icmp slt i32 %35, %36
  br i1 %37, label %38, label %48

38:                                               ; preds = %34
  %39 = load ptr, ptr %8, align 8, !tbaa !5
  %40 = load i32, ptr %12, align 4, !tbaa !9
  %41 = sext i32 %40 to i64
  %42 = getelementptr inbounds i32, ptr %39, i64 %41
  %43 = load i32, ptr %42, align 4, !tbaa !9
  %44 = load ptr, ptr %11, align 8, !tbaa !5
  call void @push(i32 noundef %43, i32 noundef 0, ptr noundef %44)
  br label %45

45:                                               ; preds = %38
  %46 = load i32, ptr %12, align 4, !tbaa !9
  %47 = add nsw i32 %46, 1
  store i32 %47, ptr %12, align 4, !tbaa !9
  br label %34, !llvm.loop !13

48:                                               ; preds = %34
  %49 = load ptr, ptr %11, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %11) #2
  ret ptr %49
}

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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 ptr @createTwoStacks(i32 noundef) local_unnamed_addr #0

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

; Function Attrs: nounwind uwtable
define dso_local ptr @initializeTwoStacks(ptr nocapture noundef readonly %0, i32 noundef %1, ptr nocapture noundef readonly %2, i32 noundef %3, i32 noundef %4) local_unnamed_addr #0 {
  %6 = add nsw i32 %3, %1
  %7 = add nsw i32 %6, %4
  %8 = tail call ptr @createTwoStacks(i32 noundef %7)
  %9 = icmp sgt i32 %1, 0
  br i1 %9, label %.lr.ph.preheader, label %.preheader

.lr.ph.preheader:                                 ; preds = %5
  %wide.trip.count = zext nneg i32 %1 to i64
  br label %.lr.ph

.preheader:                                       ; preds = %.lr.ph, %5
  %10 = icmp sgt i32 %3, 0
  br i1 %10, label %.lr.ph17.preheader, label %._crit_edge

.lr.ph17.preheader:                               ; preds = %.preheader
  %wide.trip.count22 = zext nneg i32 %3 to i64
  br label %.lr.ph17

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %11 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %12 = load i32, ptr %11, align 4, !tbaa !5
  tail call void @push(i32 noundef %12, i32 noundef 1, ptr noundef %8)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %.preheader, label %.lr.ph, !llvm.loop !9

.lr.ph17:                                         ; preds = %.lr.ph17.preheader, %.lr.ph17
  %indvars.iv19 = phi i64 [ 0, %.lr.ph17.preheader ], [ %indvars.iv.next20, %.lr.ph17 ]
  %13 = getelementptr inbounds i32, ptr %2, i64 %indvars.iv19
  %14 = load i32, ptr %13, align 4, !tbaa !5
  tail call void @push(i32 noundef %14, i32 noundef 0, ptr noundef %8)
  %indvars.iv.next20 = add nuw nsw i64 %indvars.iv19, 1
  %exitcond23.not = icmp eq i64 %indvars.iv.next20, %wide.trip.count22
  br i1 %exitcond23.not, label %._crit_edge, label %.lr.ph17, !llvm.loop !11

._crit_edge:                                      ; preds = %.lr.ph17, %.preheader
  ret ptr %8
}

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


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