; LLVM IR from nbdd0121/GenerationalGC :: Array.ll (ZN6norlit2gc6detail9ArrayBase12IterateFieldERKNS0_13FieldIteratorE)

; 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"

%"class.norlit::gc::detail::ArrayBase" = type { %"class.norlit::gc::Object.base", i64, [1 x ptr] }
%"class.norlit::gc::Object.base" = type <{ ptr, %union.anon, i8, i8, i8 }>
%union.anon = type { %struct.anon }
%struct.anon = type { 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: mustprogress uwtable
define dso_local void @_ZN6norlit2gc6detail9ArrayBase12IterateFieldERKNS0_13FieldIteratorE(ptr noundef nonnull align 8 dereferenceable(48) %0, ptr noundef nonnull align 8 dereferenceable(8) %1) unnamed_addr #1 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i64, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  %6 = load ptr, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store i64 0, ptr %5, align 8, !tbaa !9
  br label %7

7:                                                ; preds = %21, %2
  %8 = load i64, ptr %5, align 8, !tbaa !9
  %9 = getelementptr inbounds %"class.norlit::gc::detail::ArrayBase", ptr %6, i32 0, i32 1
  %10 = load i64, ptr %9, align 8, !tbaa !11
  %11 = icmp ult i64 %8, %10
  br i1 %11, label %13, label %12

12:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  br label %24

13:                                               ; preds = %7
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = getelementptr inbounds %"class.norlit::gc::detail::ArrayBase", ptr %6, i32 0, i32 2
  %16 = load i64, ptr %5, align 8, !tbaa !9
  %17 = getelementptr inbounds [1 x ptr], ptr %15, i64 0, i64 %16
  %18 = load ptr, ptr %14, align 8, !tbaa !16
  %19 = getelementptr inbounds ptr, ptr %18, i64 0
  %20 = load ptr, ptr %19, align 8
  call void %20(ptr noundef nonnull align 8 dereferenceable(8) %14, ptr noundef %17)
  br label %21

21:                                               ; preds = %13
  %22 = load i64, ptr %5, align 8, !tbaa !9
  %23 = add i64 %22, 1
  store i64 %23, ptr %5, align 8, !tbaa !9
  br label %7, !llvm.loop !18

24:                                               ; preds = %12
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = !{!12, !10, i64 32}
!12 = !{!"_ZTSN6norlit2gc6detail9ArrayBaseE", !13, i64 0, !10, i64 32, !7, i64 40}
!13 = !{!"_ZTSN6norlit2gc6ObjectE", !7, i64 8, !14, i64 24, !15, i64 25, !7, i64 26}
!14 = !{!"_ZTSN6norlit2gc5SpaceE", !7, i64 0}
!15 = !{!"_ZTSN6norlit2gc6StatusE", !7, i64 0}
!16 = !{!17, !17, i64 0}
!17 = !{!"vtable pointer", !8, i64 0}
!18 = distinct !{!18, !19}
!19 = !{!"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"

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN6norlit2gc6detail9ArrayBase12IterateFieldERKNS0_13FieldIteratorE(ptr noundef nonnull align 8 dereferenceable(48) %0, ptr noundef nonnull align 8 dereferenceable(8) %1) unnamed_addr #0 align 2 {
  %3 = getelementptr inbounds i8, ptr %0, i64 32
  %4 = load i64, ptr %3, align 8, !tbaa !5
  %.not = icmp eq i64 %4, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2
  %5 = getelementptr inbounds i8, ptr %0, i64 40
  br label %6

._crit_edge:                                      ; preds = %6, %2
  ret void

6:                                                ; preds = %.lr.ph, %6
  %.04 = phi i64 [ 0, %.lr.ph ], [ %10, %6 ]
  %7 = getelementptr inbounds [1 x ptr], ptr %5, i64 0, i64 %.04
  %8 = load ptr, ptr %1, align 8, !tbaa !13
  %9 = load ptr, ptr %8, align 8
  tail call void %9(ptr noundef nonnull align 8 dereferenceable(8) %1, ptr noundef nonnull %7)
  %10 = add nuw i64 %.04, 1
  %11 = load i64, ptr %3, align 8, !tbaa !5
  %12 = icmp ult i64 %10, %11
  br i1 %12, label %6, label %._crit_edge, !llvm.loop !15
}

attributes #0 = { mustprogress 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, !12, i64 32}
!6 = !{!"_ZTSN6norlit2gc6detail9ArrayBaseE", !7, i64 0, !12, i64 32, !8, i64 40}
!7 = !{!"_ZTSN6norlit2gc6ObjectE", !8, i64 8, !10, i64 24, !11, i64 25, !8, i64 26}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"_ZTSN6norlit2gc5SpaceE", !8, i64 0}
!11 = !{!"_ZTSN6norlit2gc6StatusE", !8, i64 0}
!12 = !{!"long", !8, i64 0}
!13 = !{!14, !14, i64 0}
!14 = !{!"vtable pointer", !9, i64 0}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}


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