; LLVM IR from ksw2000/Data-Structure-in-C :: Linked-List (01-基礎格式)

; 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 { [4 x i8], ptr }

; Function Attrs: nounwind uwtable
define dso_local void @append(ptr noundef %0, ptr noundef %1, ptr noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store ptr %2, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #4
  %9 = call noalias ptr @malloc(i64 noundef 16) #5
  store ptr %9, ptr %7, align 8, !tbaa !5
  %10 = load ptr, ptr %7, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.node, ptr %10, i32 0, i32 0
  %12 = getelementptr inbounds [4 x i8], ptr %11, i64 0, i64 0
  %13 = load ptr, ptr %6, align 8, !tbaa !5
  %14 = call ptr @strcpy(ptr noundef %12, ptr noundef %13) #4
  %15 = load ptr, ptr %7, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.node, ptr %15, i32 0, i32 1
  store ptr null, ptr %16, align 8, !tbaa !9
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = load ptr, ptr %17, align 8, !tbaa !5
  %19 = icmp ne ptr %18, null
  br i1 %19, label %25, label %20

20:                                               ; preds = %3
  %21 = load ptr, ptr %7, align 8, !tbaa !5
  %22 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %21, ptr %22, align 8, !tbaa !5
  %23 = load ptr, ptr %7, align 8, !tbaa !5
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %23, ptr %24, align 8, !tbaa !5
  store i32 1, ptr %8, align 4
  br label %35

25:                                               ; preds = %3
  %26 = load ptr, ptr %7, align 8, !tbaa !5
  %27 = load ptr, ptr %5, align 8, !tbaa !5
  %28 = load ptr, ptr %27, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.node, ptr %28, i32 0, i32 1
  store ptr %26, ptr %29, align 8, !tbaa !9
  %30 = load ptr, ptr %5, align 8, !tbaa !5
  %31 = load ptr, ptr %30, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.node, ptr %31, i32 0, i32 1
  %33 = load ptr, ptr %32, align 8, !tbaa !9
  %34 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %33, ptr %34, align 8, !tbaa !5
  store i32 0, ptr %8, align 4
  br label %35

35:                                               ; preds = %25, %20
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #4
  %36 = load i32, ptr %8, align 4
  switch i32 %36, label %38 [
    i32 0, label %37
    i32 1, label %37
  ]

37:                                               ; preds = %35, %35
  ret void

38:                                               ; preds = %35
  unreachable
}

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

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

; Function Attrs: nounwind
declare ptr @strcpy(ptr noundef, ptr noundef) #3

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

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 allocsize(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 "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 #4 = { nounwind }
attributes #5 = { nounwind allocsize(0) }

!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, !6, i64 8}
!10 = !{!"node", !7, i64 0, !6, i64 8}


; 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 nounwind willreturn uwtable
define dso_local void @append(ptr nocapture noundef %0, ptr nocapture noundef %1, ptr nocapture noundef readonly %2) local_unnamed_addr #0 {
  %4 = tail call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #3
  %5 = tail call ptr @strcpy(ptr noundef nonnull dereferenceable(1) %4, ptr noundef nonnull dereferenceable(1) %2) #4
  %6 = getelementptr inbounds i8, ptr %4, i64 8
  store ptr null, ptr %6, align 8, !tbaa !5
  %7 = load ptr, ptr %0, align 8, !tbaa !10
  %.not = icmp eq ptr %7, null
  br i1 %.not, label %8, label %9

8:                                                ; preds = %3
  store ptr %4, ptr %0, align 8, !tbaa !10
  br label %15

9:                                                ; preds = %3
  %10 = load ptr, ptr %1, align 8, !tbaa !10
  %11 = getelementptr inbounds i8, ptr %10, i64 8
  store ptr %4, ptr %11, align 8, !tbaa !5
  %12 = load ptr, ptr %1, align 8, !tbaa !10
  %13 = getelementptr inbounds i8, ptr %12, i64 8
  %14 = load ptr, ptr %13, align 8, !tbaa !5
  br label %15

15:                                               ; preds = %9, %8
  %storemerge = phi ptr [ %4, %8 ], [ %14, %9 ]
  store ptr %storemerge, ptr %1, align 8, !tbaa !10
  ret void
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: readwrite)
declare ptr @strcpy(ptr noalias noundef returned writeonly, ptr noalias nocapture noundef readonly) local_unnamed_addr #2

attributes #0 = { mustprogress nofree nounwind willreturn 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 nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 nofree nounwind willreturn memory(argmem: readwrite) "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 allocsize(0) }
attributes #4 = { 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, !9, i64 8}
!6 = !{!"node", !7, i64 0, !9, i64 8}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!"any pointer", !7, i64 0}
!10 = !{!9, !9, i64 0}


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