; LLVM IR from sbu-fsl/kernel-ml :: src/lib (kml_memory_allocator)

; 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.mem_node = type { i64, ptr, ptr }

@free_list = external hidden global ptr, align 8
@alloc_list = external hidden global ptr, align 8

; 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 hidden void @remove_from_list(ptr noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
declare hidden void @add_to_list(ptr noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local void @kml_mem_defrag(ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @kml_int_free(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  %6 = ptrtoint ptr %5 to i64
  %7 = sub i64 %6, 24
  %8 = inttoptr i64 %7 to ptr
  store ptr %8, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %9 = load ptr, ptr @alloc_list, align 8, !tbaa !5
  store ptr %9, ptr %4, align 8, !tbaa !5
  br label %10

10:                                               ; preds = %19, %1
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = icmp ne ptr %11, null
  br i1 %12, label %13, label %17

13:                                               ; preds = %10
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = icmp ne ptr %14, %15
  br label %17

17:                                               ; preds = %13, %10
  %18 = phi i1 [ false, %10 ], [ %16, %13 ]
  br i1 %18, label %19, label %23

19:                                               ; preds = %17
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.mem_node, ptr %20, i32 0, i32 1
  %22 = load ptr, ptr %21, align 8, !tbaa !9
  store ptr %22, ptr %4, align 8, !tbaa !5
  br label %10, !llvm.loop !12

23:                                               ; preds = %17
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = icmp ne ptr %24, null
  br i1 %25, label %26, label %30

26:                                               ; preds = %23
  %27 = load ptr, ptr %4, align 8, !tbaa !5
  call void @remove_from_list(ptr noundef @alloc_list, ptr noundef %27)
  %28 = load ptr, ptr %4, align 8, !tbaa !5
  call void @add_to_list(ptr noundef @free_list, ptr noundef %28)
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  call void @kml_mem_defrag(ptr noundef %29)
  br label %30

30:                                               ; preds = %26, %23
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret void
}

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 8}
!10 = !{!"mem_node", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"long", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


; 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"

@free_list = external hidden global ptr, align 8
@alloc_list = external hidden global ptr, align 8

; Function Attrs: nounwind uwtable
declare hidden void @remove_from_list(ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare hidden void @add_to_list(ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @kml_mem_defrag(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @kml_int_free(ptr noundef %0) local_unnamed_addr #0 {
  %2 = ptrtoint ptr %0 to i64
  %3 = add i64 %2, -24
  %4 = inttoptr i64 %3 to ptr
  br label %5

5:                                                ; preds = %5, %1
  %.0.in = phi ptr [ @alloc_list, %1 ], [ %9, %5 ]
  %.0 = load ptr, ptr %.0.in, align 8, !tbaa !5
  %6 = icmp ne ptr %.0, null
  %7 = icmp ne ptr %.0, %4
  %8 = and i1 %6, %7
  %9 = getelementptr inbounds i8, ptr %.0, i64 8
  br i1 %8, label %5, label %10, !llvm.loop !9

10:                                               ; preds = %5
  br i1 %6, label %11, label %12

11:                                               ; preds = %10
  tail call void @remove_from_list(ptr noundef nonnull @alloc_list, ptr noundef nonnull %.0)
  tail call void @add_to_list(ptr noundef nonnull @free_list, ptr noundef nonnull %.0)
  tail call void @kml_mem_defrag(ptr noundef nonnull %.0)
  br label %12

12:                                               ; preds = %11, %10
  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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopRotatePass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass