; LLVM IR from graphitemaster/libintrusive :: list (list_push_back)

; 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.list_s = type { ptr, ptr }
%struct.link_s = type { ptr, ptr }

; Function Attrs: nounwind uwtable
define dso_local void @list_push_back(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  %5 = load ptr, ptr %3, align 8, !tbaa !5
  %6 = getelementptr inbounds %struct.list_s, ptr %5, i32 0, i32 1
  %7 = load ptr, ptr %6, align 8, !tbaa !9
  %8 = icmp ne ptr %7, null
  br i1 %8, label %9, label %25

9:                                                ; preds = %2
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.list_s, ptr %11, i32 0, i32 1
  %13 = load ptr, ptr %12, align 8, !tbaa !9
  %14 = getelementptr inbounds %struct.link_s, ptr %13, i32 0, i32 1
  store ptr %10, ptr %14, align 8, !tbaa !11
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.list_s, ptr %15, i32 0, i32 1
  %17 = load ptr, ptr %16, align 8, !tbaa !9
  %18 = load ptr, ptr %4, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.link_s, ptr %18, i32 0, i32 0
  store ptr %17, ptr %19, align 8, !tbaa !13
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.link_s, ptr %20, i32 0, i32 1
  store ptr null, ptr %21, align 8, !tbaa !11
  %22 = load ptr, ptr %4, align 8, !tbaa !5
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.list_s, ptr %23, i32 0, i32 1
  store ptr %22, ptr %24, align 8, !tbaa !9
  br label %36

25:                                               ; preds = %2
  %26 = load ptr, ptr %4, align 8, !tbaa !5
  %27 = load ptr, ptr %3, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.list_s, ptr %27, i32 0, i32 0
  store ptr %26, ptr %28, align 8, !tbaa !14
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = load ptr, ptr %3, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.list_s, ptr %30, i32 0, i32 1
  store ptr %29, ptr %31, align 8, !tbaa !9
  %32 = load ptr, ptr %4, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.link_s, ptr %32, i32 0, i32 1
  store ptr null, ptr %33, align 8, !tbaa !11
  %34 = load ptr, ptr %4, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.link_s, ptr %34, i32 0, i32 0
  store ptr null, ptr %35, align 8, !tbaa !13
  br label %36

36:                                               ; preds = %25, %9
  ret void
}

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, !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 = !{!"list_s", !6, i64 0, !6, i64 8}
!11 = !{!12, !6, i64 8}
!12 = !{!"link_s", !6, i64 0, !6, i64 8}
!13 = !{!12, !6, i64 0}
!14 = !{!10, !6, i64 0}


; 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 willreturn memory(write, argmem: readwrite, inaccessiblemem: none) uwtable
define dso_local void @list_push_back(ptr nocapture noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i8, ptr %0, i64 8
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %.not = icmp eq ptr %4, null
  %5 = getelementptr inbounds i8, ptr %4, i64 8
  %.sink = select i1 %.not, ptr %0, ptr %5
  store ptr %1, ptr %.sink, align 8, !tbaa !10
  store ptr %1, ptr %3, align 8
  %6 = getelementptr inbounds i8, ptr %1, i64 8
  store ptr null, ptr %6, align 8
  store ptr %4, ptr %1, align 8
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(write, argmem: 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, !7, i64 8}
!6 = !{!"list_s", !7, i64 0, !7, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!7, !7, i64 0}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InstCombinePass,MergedLoadStoreMotionPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass