; LLVM IR from aagdev/mlimgsynth :: src/ccommon (alloc_arena)

; 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.AllocatorArena = type { i64, ptr, ptr }
%struct.AllocArenaPage = type { ptr, i64, [0 x i8] }

; Function Attrs: nounwind uwtable
define dso_local void @alloc_arena_free(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  %6 = getelementptr inbounds %struct.AllocatorArena, 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 %29

9:                                                ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %10 = load ptr, ptr %2, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.AllocatorArena, ptr %10, i32 0, i32 2
  %12 = load ptr, ptr %11, align 8, !tbaa !12
  store ptr %12, ptr %4, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %16, %9
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %14, ptr %3, align 8, !tbaa !5
  %15 = icmp ne ptr %14, null
  br i1 %15, label %16, label %24

16:                                               ; preds = %13
  %17 = load ptr, ptr %3, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.AllocArenaPage, ptr %17, i32 0, i32 0
  %19 = load ptr, ptr %18, align 8, !tbaa !5
  store ptr %19, ptr %4, align 8, !tbaa !5
  %20 = load ptr, ptr %2, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.AllocatorArena, ptr %20, i32 0, i32 1
  %22 = load ptr, ptr %21, align 8, !tbaa !9
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  call void @alloc_free(ptr noundef %22, ptr noundef %23)
  br label %13, !llvm.loop !13

24:                                               ; preds = %13
  %25 = load ptr, ptr %2, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.AllocatorArena, ptr %25, i32 0, i32 2
  store ptr null, ptr %26, align 8, !tbaa !12
  %27 = load ptr, ptr %2, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.AllocatorArena, ptr %27, i32 0, i32 0
  store i64 0, ptr %28, align 8, !tbaa !15
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  br label %43

29:                                               ; preds = %1
  %30 = load ptr, ptr %2, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.AllocatorArena, ptr %30, i32 0, i32 2
  %32 = load ptr, ptr %31, align 8, !tbaa !12
  %33 = icmp ne ptr %32, null
  br i1 %33, label %34, label %42

34:                                               ; preds = %29
  %35 = load ptr, ptr %2, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.AllocatorArena, ptr %35, i32 0, i32 2
  %37 = load ptr, ptr %36, align 8, !tbaa !12
  %38 = getelementptr inbounds %struct.AllocArenaPage, ptr %37, i32 0, i32 1
  %39 = load i64, ptr %38, align 8, !tbaa !16
  %40 = load ptr, ptr %2, align 8, !tbaa !5
  %41 = getelementptr inbounds %struct.AllocatorArena, ptr %40, i32 0, i32 0
  store i64 %39, ptr %41, align 8, !tbaa !15
  br label %42

42:                                               ; preds = %34, %29
  br label %43

43:                                               ; preds = %42, %24
  ret void
}

; 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: inlinehint nounwind uwtable
declare hidden void @alloc_free(ptr noundef, ptr 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 = { inlinehint 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 #3 = { 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 = !{!"AllocatorArena", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"long", !7, i64 0}
!12 = !{!10, !6, i64 16}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{!10, !11, i64 0}
!16 = !{!11, !11, 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: nounwind uwtable
define dso_local void @alloc_arena_free(ptr nocapture noundef %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 8
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %.not = icmp eq ptr %3, null
  %4 = getelementptr inbounds i8, ptr %0, i64 16
  %5 = load ptr, ptr %4, align 8, !tbaa !11
  %.not12 = icmp eq ptr %5, null
  br i1 %.not, label %9, label %6

6:                                                ; preds = %1
  br i1 %.not12, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %6, %.lr.ph
  %.015 = phi ptr [ %7, %.lr.ph ], [ %5, %6 ]
  %7 = load ptr, ptr %.015, align 8, !tbaa !12
  %8 = load ptr, ptr %2, align 8, !tbaa !5
  tail call void @alloc_free(ptr noundef %8, ptr noundef nonnull %.015)
  %.not13 = icmp eq ptr %7, null
  br i1 %.not13, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph, %6
  store ptr null, ptr %4, align 8, !tbaa !11
  br label %.sink.split

9:                                                ; preds = %1
  br i1 %.not12, label %13, label %10

10:                                               ; preds = %9
  %11 = getelementptr inbounds i8, ptr %5, i64 8
  %12 = load i64, ptr %11, align 8, !tbaa !15
  br label %.sink.split

.sink.split:                                      ; preds = %._crit_edge, %10
  %.sink = phi i64 [ %12, %10 ], [ 0, %._crit_edge ]
  store i64 %.sink, ptr %0, align 8, !tbaa !16
  br label %13

13:                                               ; preds = %.sink.split, %9
  ret void
}

; Function Attrs: inlinehint nounwind uwtable
declare hidden void @alloc_free(ptr noundef, ptr 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 = { inlinehint 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, !10, i64 8}
!6 = !{!"AllocatorArena", !7, i64 0, !10, i64 8, !10, i64 16}
!7 = !{!"long", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 16}
!12 = !{!10, !10, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{!7, !7, i64 0}
!16 = !{!6, !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass