; LLVM IR from priyankchheda/algorithms :: _other_languages/cpp/LinkedList (detectLoop)

; 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.LinkedList::Node" = type { float, ptr }

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef ptr @_ZN10LinkedList10LinkedListIfE7getHeadEv(ptr noundef nonnull align 8 dereferenceable(8)) #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z10detectLoopPN10LinkedList10LinkedListIfEE(ptr noundef %0) #2 {
  %2 = alloca i1, align 1
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = call noundef ptr @_ZN10LinkedList10LinkedListIfE7getHeadEv(ptr noundef nonnull align 8 dereferenceable(8) %8)
  store ptr %9, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %10, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %11, ptr %6, align 8, !tbaa !5
  br label %12

12:                                               ; preds = %35, %1
  %13 = load ptr, ptr %6, align 8, !tbaa !5
  %14 = icmp ne ptr %13, null
  br i1 %14, label %15, label %20

15:                                               ; preds = %12
  %16 = load ptr, ptr %6, align 8, !tbaa !5
  %17 = getelementptr inbounds %"struct.LinkedList::Node", ptr %16, i32 0, i32 1
  %18 = load ptr, ptr %17, align 8, !tbaa !9
  %19 = icmp ne ptr %18, null
  br label %20

20:                                               ; preds = %15, %12
  %21 = phi i1 [ false, %12 ], [ %19, %15 ]
  br i1 %21, label %22, label %36

22:                                               ; preds = %20
  %23 = load ptr, ptr %6, align 8, !tbaa !5
  %24 = getelementptr inbounds %"struct.LinkedList::Node", ptr %23, i32 0, i32 1
  %25 = load ptr, ptr %24, align 8, !tbaa !9
  %26 = getelementptr inbounds %"struct.LinkedList::Node", ptr %25, i32 0, i32 1
  %27 = load ptr, ptr %26, align 8, !tbaa !9
  store ptr %27, ptr %6, align 8, !tbaa !5
  %28 = load ptr, ptr %5, align 8, !tbaa !5
  %29 = getelementptr inbounds %"struct.LinkedList::Node", ptr %28, i32 0, i32 1
  %30 = load ptr, ptr %29, align 8, !tbaa !9
  store ptr %30, ptr %5, align 8, !tbaa !5
  %31 = load ptr, ptr %6, align 8, !tbaa !5
  %32 = load ptr, ptr %5, align 8, !tbaa !5
  %33 = icmp eq ptr %31, %32
  br i1 %33, label %34, label %35

34:                                               ; preds = %22
  store i1 true, ptr %2, align 1
  store i32 1, ptr %7, align 4
  br label %37

35:                                               ; preds = %22
  br label %12, !llvm.loop !12

36:                                               ; preds = %20
  store i1 false, ptr %2, align 1
  store i32 1, ptr %7, align 4
  br label %37

37:                                               ; preds = %36, %34
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  %38 = load i1, ptr %2, align 1
  ret i1 %38
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 = { mustprogress 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 #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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"_ZTSN10LinkedList4NodeIfEE", !11, i64 0, !6, i64 8}
!11 = !{!"float", !7, 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: mustprogress nounwind uwtable
declare dso_local noundef ptr @_ZN10LinkedList10LinkedListIfE7getHeadEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z10detectLoopPN10LinkedList10LinkedListIfEE(ptr noundef nonnull %0) local_unnamed_addr #0 {
  %2 = tail call noundef ptr @_ZN10LinkedList10LinkedListIfE7getHeadEv(ptr noundef nonnull align 8 dereferenceable(8) %0)
  br label %3

3:                                                ; preds = %7, %1
  %.010 = phi ptr [ %2, %1 ], [ %11, %7 ]
  %.0 = phi ptr [ %2, %1 ], [ %9, %7 ]
  %.not = icmp eq ptr %.0, null
  br i1 %.not, label %.critedge, label %4

4:                                                ; preds = %3
  %5 = getelementptr inbounds i8, ptr %.0, i64 8
  %6 = load ptr, ptr %5, align 8, !tbaa !5
  %.not15 = icmp eq ptr %6, null
  br i1 %.not15, label %.critedge, label %7

7:                                                ; preds = %4
  %8 = getelementptr inbounds i8, ptr %6, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %10 = getelementptr inbounds i8, ptr %.010, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !5
  %12 = icmp eq ptr %9, %11
  br i1 %12, label %.critedge, label %3, !llvm.loop !11

.critedge:                                        ; preds = %4, %3, %7
  %.011 = phi i1 [ true, %7 ], [ false, %3 ], [ false, %4 ]
  ret i1 %.011
}

attributes #0 = { mustprogress 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, !10, i64 8}
!6 = !{!"_ZTSN10LinkedList4NodeIfEE", !7, i64 0, !10, i64 8}
!7 = !{!"float", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass