; LLVM IR from oservo/aiFi :: linkedList (linkedListAddNodeBeforeHead)

; 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.linkedListNode = type { ptr, ptr, ptr }
%struct.linkedList = type { ptr, ptr, 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: nounwind uwtable
declare dso_local ptr @linkedListNewNode() #1

; Function Attrs: nounwind uwtable
define dso_local ptr @linkedListAddNodeBeforeHead(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = 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
  %6 = call ptr @linkedListNewNode()
  store ptr %6, ptr %5, align 8, !tbaa !5
  %7 = load ptr, ptr %4, align 8, !tbaa !5
  %8 = load ptr, ptr %5, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.linkedListNode, ptr %8, i32 0, i32 2
  store ptr %7, ptr %9, align 8, !tbaa !9
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.linkedListNode, ptr %10, i32 0, i32 0
  store ptr null, ptr %11, align 8, !tbaa !11
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.linkedList, ptr %12, i32 0, i32 0
  %14 = load ptr, ptr %13, align 8, !tbaa !12
  %15 = icmp eq ptr %14, null
  br i1 %15, label %16, label %22

16:                                               ; preds = %2
  %17 = load ptr, ptr %5, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.linkedListNode, ptr %17, i32 0, i32 1
  store ptr null, ptr %18, align 8, !tbaa !14
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = load ptr, ptr %3, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.linkedList, ptr %20, i32 0, i32 1
  store ptr %19, ptr %21, align 8, !tbaa !15
  br label %28

22:                                               ; preds = %2
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.linkedList, ptr %23, i32 0, i32 0
  %25 = load ptr, ptr %24, align 8, !tbaa !12
  %26 = load ptr, ptr %5, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.linkedListNode, ptr %26, i32 0, i32 1
  store ptr %25, ptr %27, align 8, !tbaa !14
  br label %28

28:                                               ; preds = %22, %16
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  %30 = load ptr, ptr %3, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.linkedList, ptr %30, i32 0, i32 0
  store ptr %29, ptr %31, align 8, !tbaa !12
  %32 = load ptr, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret ptr %32
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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/C++ TBAA"}
!9 = !{!10, !6, i64 16}
!10 = !{!"linkedListNode", !6, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!10, !6, i64 0}
!12 = !{!13, !6, i64 0}
!13 = !{!"linkedList", !6, i64 0, !6, i64 8, !6, i64 16}
!14 = !{!10, !6, i64 8}
!15 = !{!13, !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: nounwind uwtable
declare dso_local ptr @linkedListNewNode() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef ptr @linkedListAddNodeBeforeHead(ptr nocapture noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = tail call ptr @linkedListNewNode()
  %4 = getelementptr inbounds i8, ptr %3, i64 16
  store ptr %1, ptr %4, align 8, !tbaa !5
  store ptr null, ptr %3, align 8, !tbaa !10
  %5 = load ptr, ptr %0, align 8, !tbaa !11
  %6 = icmp eq ptr %5, null
  br i1 %6, label %7, label %9

7:                                                ; preds = %2
  %8 = getelementptr inbounds i8, ptr %0, i64 8
  store ptr %3, ptr %8, align 8, !tbaa !13
  br label %9

9:                                                ; preds = %2, %7
  %10 = getelementptr inbounds i8, ptr %3, i64 8
  store ptr %5, ptr %10, align 8
  store ptr %3, ptr %0, align 8, !tbaa !11
  ret ptr %3
}

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" }

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


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,MergedLoadStoreMotionPass,PostOrderFunctionAttrsPass,SROAPass,TailCallElimPass