; LLVM IR from brewlin/garbage-collect :: gc-python (Hugmem)

; 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.link_list = type { ptr, i32, ptr }
%struct.list = type { ptr }

; Function Attrs: nounwind uwtable
define dso_local void @push(ptr noundef %0, ptr noundef %1, i32 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %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 i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %9 = call noalias ptr @malloc(i64 noundef 24) #4
  store ptr %9, ptr %7, align 8, !tbaa !5
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  %11 = load ptr, ptr %7, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.link_list, ptr %11, i32 0, i32 0
  store ptr %10, ptr %12, align 8, !tbaa !11
  %13 = load i32, ptr %6, align 4, !tbaa !9
  %14 = load ptr, ptr %7, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.link_list, ptr %14, i32 0, i32 1
  store i32 %13, ptr %15, align 8, !tbaa !13
  %16 = load ptr, ptr %7, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.link_list, ptr %16, i32 0, i32 2
  store ptr null, ptr %17, align 8, !tbaa !14
  %18 = load ptr, ptr %4, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.list, ptr %18, i32 0, i32 0
  %20 = load ptr, ptr %19, align 8, !tbaa !15
  %21 = icmp eq ptr %20, null
  br i1 %21, label %22, label %26

22:                                               ; preds = %3
  %23 = load ptr, ptr %7, align 8, !tbaa !5
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.list, ptr %24, i32 0, i32 0
  store ptr %23, ptr %25, align 8, !tbaa !15
  store i32 1, ptr %8, align 4
  br label %35

26:                                               ; preds = %3
  %27 = load ptr, ptr %4, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.list, ptr %27, i32 0, i32 0
  %29 = load ptr, ptr %28, align 8, !tbaa !15
  %30 = load ptr, ptr %7, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.link_list, ptr %30, i32 0, i32 2
  store ptr %29, ptr %31, align 8, !tbaa !14
  %32 = load ptr, ptr %7, align 8, !tbaa !5
  %33 = load ptr, ptr %4, align 8, !tbaa !5
  %34 = getelementptr inbounds %struct.list, ptr %33, i32 0, i32 0
  store ptr %32, ptr %34, align 8, !tbaa !15
  store i32 0, ptr %8, align 4
  br label %35

35:                                               ; preds = %26, %22
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  %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: 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 }
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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"link_list", !6, i64 0, !10, i64 8, !6, i64 16}
!13 = !{!12, !10, i64 8}
!14 = !{!12, !6, i64 16}
!15 = !{!16, !6, i64 0}
!16 = !{!"list", !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 nounwind willreturn memory(write, argmem: readwrite, inaccessiblemem: readwrite) uwtable
define dso_local void @push(ptr nocapture noundef %0, ptr noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = tail call noalias dereferenceable_or_null(24) ptr @malloc(i64 noundef 24) #2
  store ptr %1, ptr %4, align 8, !tbaa !5
  %5 = getelementptr inbounds i8, ptr %4, i64 8
  store i32 %2, ptr %5, align 8, !tbaa !11
  %6 = getelementptr inbounds i8, ptr %4, i64 16
  %7 = load ptr, ptr %0, align 8, !tbaa !12
  store ptr %7, ptr %6, align 8
  store ptr %4, ptr %0, 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 = { mustprogress nofree nounwind willreturn memory(write, argmem: readwrite, inaccessiblemem: readwrite) 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 0}
!6 = !{!"link_list", !7, i64 0, !10, i64 8, !7, i64 16}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!6, !10, i64 8}
!12 = !{!13, !7, i64 0}
!13 = !{!"list", !7, i64 0}


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