; LLVM IR from sbshah97/DS-Algo-Handbook :: Data-Structures/Linked_List/Doubly_Linked_List (doubly)

; 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, i32, ptr, ptr }

@head = external dso_local global ptr, align 8
@last = external dso_local global ptr, align 8

; Function Attrs: nounwind uwtable
declare dso_local zeroext i1 @isEmpty() #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
define dso_local void @insertFirst(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %6 = call noalias ptr @malloc(i64 noundef 24) #4
  store ptr %6, ptr %5, align 8, !tbaa !9
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = load ptr, ptr %5, align 8, !tbaa !9
  %9 = getelementptr inbounds %struct.node, ptr %8, i32 0, i32 1
  store i32 %7, ptr %9, align 4, !tbaa !11
  %10 = load i32, ptr %4, align 4, !tbaa !5
  %11 = load ptr, ptr %5, align 8, !tbaa !9
  %12 = getelementptr inbounds %struct.node, ptr %11, i32 0, i32 0
  store i32 %10, ptr %12, align 8, !tbaa !13
  %13 = call zeroext i1 @isEmpty()
  br i1 %13, label %14, label %16

14:                                               ; preds = %2
  %15 = load ptr, ptr %5, align 8, !tbaa !9
  store ptr %15, ptr @last, align 8, !tbaa !9
  br label %20

16:                                               ; preds = %2
  %17 = load ptr, ptr %5, align 8, !tbaa !9
  %18 = load ptr, ptr @head, align 8, !tbaa !9
  %19 = getelementptr inbounds %struct.node, ptr %18, i32 0, i32 3
  store ptr %17, ptr %19, align 8, !tbaa !14
  br label %20

20:                                               ; preds = %16, %14
  %21 = load ptr, ptr @head, align 8, !tbaa !9
  %22 = load ptr, ptr %5, align 8, !tbaa !9
  %23 = getelementptr inbounds %struct.node, ptr %22, i32 0, i32 2
  store ptr %21, ptr %23, align 8, !tbaa !15
  %24 = load ptr, ptr %5, align 8, !tbaa !9
  store ptr %24, ptr @head, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  ret void
}

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #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 = { 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 }
attributes #4 = { 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 = !{!"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 = !{!12, !6, i64 4}
!12 = !{!"node", !6, i64 0, !6, i64 4, !10, i64 8, !10, i64 16}
!13 = !{!12, !6, i64 0}
!14 = !{!12, !10, i64 16}
!15 = !{!12, !10, 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"

@head = external dso_local local_unnamed_addr global ptr, align 8
@last = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: nounwind uwtable
declare dso_local zeroext i1 @isEmpty() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @insertFirst(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = tail call noalias dereferenceable_or_null(24) ptr @malloc(i64 noundef 24) #2
  %4 = getelementptr inbounds i8, ptr %3, i64 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %3, align 8, !tbaa !11
  %5 = tail call zeroext i1 @isEmpty()
  br i1 %5, label %6, label %7

6:                                                ; preds = %2
  store ptr %3, ptr @last, align 8, !tbaa !12
  %.pre = load ptr, ptr @head, align 8, !tbaa !12
  br label %10

7:                                                ; preds = %2
  %8 = load ptr, ptr @head, align 8, !tbaa !12
  %9 = getelementptr inbounds i8, ptr %8, i64 16
  store ptr %3, ptr %9, align 8, !tbaa !13
  br label %10

10:                                               ; preds = %7, %6
  %11 = phi ptr [ %8, %7 ], [ %.pre, %6 ]
  %12 = getelementptr inbounds i8, ptr %3, i64 8
  store ptr %11, ptr %12, align 8, !tbaa !14
  store ptr %3, ptr @head, align 8, !tbaa !12
  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

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 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 = { 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, !7, i64 4}
!6 = !{!"node", !7, i64 0, !7, i64 4, !10, i64 8, !10, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !7, i64 0}
!12 = !{!10, !10, i64 0}
!13 = !{!6, !10, i64 16}
!14 = !{!6, !10, i64 8}


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