; LLVM IR from Algo-Phantoms/Algo-Tree :: Linked_list/RemoveLoopFromLinkedList.ll (Z11remove_loopP4nodeS0_)

; 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.node = type { i32, ptr }

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

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

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z11remove_loopP4nodeS0_(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %9, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %10, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %11, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  store ptr null, ptr %8, align 8, !tbaa !5
  br label %12

12:                                               ; preds = %18, %2
  %13 = load ptr, ptr %7, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.node, ptr %13, i32 0, i32 1
  %15 = load ptr, ptr %14, align 8, !tbaa !9
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = icmp ne ptr %15, %16
  br i1 %17, label %18, label %25

18:                                               ; preds = %12
  %19 = load ptr, ptr %7, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.node, ptr %19, i32 0, i32 1
  %21 = load ptr, ptr %20, align 8, !tbaa !9
  store ptr %21, ptr %7, align 8, !tbaa !5
  %22 = load ptr, ptr %6, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.node, ptr %22, i32 0, i32 1
  %24 = load ptr, ptr %23, align 8, !tbaa !9
  store ptr %24, ptr %6, align 8, !tbaa !5
  br label %12, !llvm.loop !12

25:                                               ; preds = %12
  %26 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %26, ptr %8, align 8, !tbaa !5
  %27 = load ptr, ptr %6, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.node, ptr %27, i32 0, i32 1
  %29 = load ptr, ptr %28, align 8, !tbaa !9
  store ptr %29, ptr %6, align 8, !tbaa !5
  br label %30

30:                                               ; preds = %34, %25
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = load ptr, ptr %6, align 8, !tbaa !5
  %33 = icmp ne ptr %31, %32
  br i1 %33, label %34, label %42

34:                                               ; preds = %30
  %35 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %35, ptr %8, align 8, !tbaa !5
  %36 = load ptr, ptr %6, align 8, !tbaa !5
  %37 = getelementptr inbounds %struct.node, ptr %36, i32 0, i32 1
  %38 = load ptr, ptr %37, align 8, !tbaa !9
  store ptr %38, ptr %6, align 8, !tbaa !5
  %39 = load ptr, ptr %5, align 8, !tbaa !5
  %40 = getelementptr inbounds %struct.node, ptr %39, i32 0, i32 1
  %41 = load ptr, ptr %40, align 8, !tbaa !9
  store ptr %41, ptr %5, align 8, !tbaa !5
  br label %30, !llvm.loop !14

42:                                               ; preds = %30
  %43 = load ptr, ptr %8, align 8, !tbaa !5
  %44 = getelementptr inbounds %struct.node, ptr %43, i32 0, i32 1
  store ptr null, ptr %44, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret void
}

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 = { 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 = !{!"_ZTS4node", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = distinct !{!14, !13}


; 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 nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @_Z11remove_loopP4nodeS0_(ptr noundef %0, ptr noundef readonly %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i8, ptr %1, i64 8
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %.not20 = icmp eq ptr %4, %1
  br i1 %.not20, label %.preheader, label %.lr.ph

.preheader:                                       ; preds = %.lr.ph, %2
  %.016.lcssa = phi ptr [ %0, %2 ], [ %7, %.lr.ph ]
  %.1.in22 = getelementptr inbounds i8, ptr %.016.lcssa, i64 8
  %.123 = load ptr, ptr %.1.in22, align 8, !tbaa !5
  %.not1924 = icmp eq ptr %.123, %0
  br i1 %.not1924, label %._crit_edge, label %.lr.ph27

.lr.ph:                                           ; preds = %2, %.lr.ph
  %5 = phi ptr [ %9, %.lr.ph ], [ %4, %2 ]
  %.01621 = phi ptr [ %7, %.lr.ph ], [ %0, %2 ]
  %6 = getelementptr inbounds i8, ptr %.01621, i64 8
  %7 = load ptr, ptr %6, align 8, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %5, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %.not = icmp eq ptr %9, %1
  br i1 %.not, label %.preheader, label %.lr.ph, !llvm.loop !11

.lr.ph27:                                         ; preds = %.preheader, %.lr.ph27
  %.126 = phi ptr [ %.1, %.lr.ph27 ], [ %.123, %.preheader ]
  %.01725 = phi ptr [ %11, %.lr.ph27 ], [ %0, %.preheader ]
  %10 = getelementptr inbounds i8, ptr %.01725, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !5
  %.1.in = getelementptr inbounds i8, ptr %.126, i64 8
  %.1 = load ptr, ptr %.1.in, align 8, !tbaa !5
  %.not19 = icmp eq ptr %11, %.1
  br i1 %.not19, label %._crit_edge, label %.lr.ph27, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph27, %.preheader
  %.0.lcssa = phi ptr [ %.016.lcssa, %.preheader ], [ %.126, %.lr.ph27 ]
  %.1.in.le = getelementptr inbounds i8, ptr %.0.lcssa, i64 8
  store ptr null, ptr %.1.in.le, align 8, !tbaa !5
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) 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 = !{!"_ZTS4node", !7, i64 0, !10, i64 8}
!7 = !{!"int", !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"}
!13 = distinct !{!13, !12}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass