; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 03. Recursion (reverselinkedlist_recursive)

; 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"

@__const.main.keys = external hidden unnamed_addr constant [6 x i32], align 16

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

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

; Function Attrs: nounwind uwtable
define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca [6 x i32], align 16
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 24, ptr %2) #3
  call void @llvm.memcpy.p0.p0.i64(ptr align 16 %2, ptr align 16 @__const.main.keys, i64 24, i1 false)
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 6, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  store ptr null, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = sub nsw i32 %6, 1
  store i32 %7, ptr %5, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %17, %0
  %9 = load i32, ptr %5, align 4, !tbaa !5
  %10 = icmp sge i32 %9, 0
  br i1 %10, label %12, label %11

11:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  br label %20

12:                                               ; preds = %8
  %13 = load i32, ptr %5, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [6 x i32], ptr %2, i64 0, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !5
  call void @push(ptr noundef %4, i32 noundef %16)
  br label %17

17:                                               ; preds = %12
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = add nsw i32 %18, -1
  store i32 %19, ptr %5, align 4, !tbaa !5
  br label %8, !llvm.loop !11

20:                                               ; preds = %11
  call void @reverse(ptr noundef %4)
  %21 = load ptr, ptr %4, align 8, !tbaa !9
  call void @printList(ptr noundef %21)
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 24, ptr %2) #3
  ret i32 0
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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"

@__const.main.keys = external hidden unnamed_addr constant [6 x i32], align 16

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

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress 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(ptr noundef, i32 noundef) local_unnamed_addr #0

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

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %1) #2
  store ptr null, ptr %1, align 8, !tbaa !5
  %2 = load i32, ptr getelementptr inbounds (i8, ptr @__const.main.keys, i64 20), align 4, !tbaa !9
  call void @push(ptr noundef nonnull %1, i32 noundef %2)
  %3 = load i32, ptr getelementptr inbounds (i8, ptr @__const.main.keys, i64 16), align 16, !tbaa !9
  call void @push(ptr noundef nonnull %1, i32 noundef %3)
  %4 = load i32, ptr getelementptr inbounds (i8, ptr @__const.main.keys, i64 12), align 4, !tbaa !9
  call void @push(ptr noundef nonnull %1, i32 noundef %4)
  %5 = load i32, ptr getelementptr inbounds (i8, ptr @__const.main.keys, i64 8), align 8, !tbaa !9
  call void @push(ptr noundef nonnull %1, i32 noundef %5)
  %6 = load i32, ptr getelementptr inbounds (i8, ptr @__const.main.keys, i64 4), align 4, !tbaa !9
  call void @push(ptr noundef nonnull %1, i32 noundef %6)
  %7 = load i32, ptr @__const.main.keys, align 16, !tbaa !9
  call void @push(ptr noundef nonnull %1, i32 noundef %7)
  call void @reverse(ptr noundef nonnull %1)
  %8 = load ptr, ptr %1, align 8, !tbaa !5
  call void @printList(ptr noundef %8)
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %1) #2
  ret i32 0
}

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 = { mustprogress 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}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass