; LLVM IR from thepowersgang/mrustc :: src/span.ll (ZN4SpanD2Ev)

; 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.Span = type { ptr }
%struct.SpanInner = type { ptr, i64, %struct.Span }

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN4SpanD2Ev(ptr noundef nonnull align 8 dereferenceable(8) %0) unnamed_addr #0 align 2 {
  %2 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %3 = load ptr, ptr %2, align 8
  %4 = getelementptr inbounds %struct.Span, ptr %3, i32 0, i32 0
  %5 = load ptr, ptr %4, align 8, !tbaa !9
  %6 = icmp ne ptr %5, null
  br i1 %6, label %7, label %29

7:                                                ; preds = %1
  %8 = getelementptr inbounds %struct.Span, ptr %3, i32 0, i32 0
  %9 = load ptr, ptr %8, align 8, !tbaa !9
  %10 = getelementptr inbounds %struct.SpanInner, ptr %9, i32 0, i32 1
  %11 = load i64, ptr %10, align 8, !tbaa !11
  %12 = add i64 %11, -1
  store i64 %12, ptr %10, align 8, !tbaa !11
  %13 = getelementptr inbounds %struct.Span, ptr %3, i32 0, i32 0
  %14 = load ptr, ptr %13, align 8, !tbaa !9
  %15 = getelementptr inbounds %struct.SpanInner, ptr %14, i32 0, i32 1
  %16 = load i64, ptr %15, align 8, !tbaa !11
  %17 = icmp eq i64 %16, 0
  br i1 %17, label %18, label %27

18:                                               ; preds = %7
  %19 = getelementptr inbounds %struct.Span, ptr %3, i32 0, i32 0
  %20 = load ptr, ptr %19, align 8, !tbaa !9
  %21 = icmp eq ptr %20, null
  br i1 %21, label %26, label %22

22:                                               ; preds = %18
  %23 = load ptr, ptr %20, align 8, !tbaa !14
  %24 = getelementptr inbounds ptr, ptr %23, i64 1
  %25 = load ptr, ptr %24, align 8
  call void %25(ptr noundef nonnull align 8 dereferenceable(24) %20) #1
  br label %26

26:                                               ; preds = %22, %18
  br label %27

27:                                               ; preds = %26, %7
  %28 = getelementptr inbounds %struct.Span, ptr %3, i32 0, i32 0
  store ptr null, ptr %28, align 8, !tbaa !9
  br label %29

29:                                               ; preds = %27, %1
  ret void
}

attributes #0 = { mustprogress 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 = { 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, !6, i64 0}
!10 = !{!"_ZTS4Span", !6, i64 0}
!11 = !{!12, !13, i64 8}
!12 = !{!"_ZTS9SpanInner", !13, i64 8, !10, i64 16}
!13 = !{!"long", !7, i64 0}
!14 = !{!15, !15, i64 0}
!15 = !{!"vtable pointer", !8, 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 nounwind uwtable
define dso_local void @_ZN4SpanD2Ev(ptr nocapture noundef nonnull align 8 dereferenceable(8) %0) unnamed_addr #0 align 2 {
  %2 = load ptr, ptr %0, align 8, !tbaa !5
  %.not = icmp eq ptr %2, null
  br i1 %.not, label %12, label %3

3:                                                ; preds = %1
  %4 = getelementptr inbounds i8, ptr %2, i64 8
  %5 = load i64, ptr %4, align 8, !tbaa !10
  %6 = add i64 %5, -1
  store i64 %6, ptr %4, align 8, !tbaa !10
  %.not2 = icmp eq i64 %6, 0
  br i1 %.not2, label %7, label %11

7:                                                ; preds = %3
  %8 = load ptr, ptr %2, align 8, !tbaa !13
  %9 = getelementptr inbounds i8, ptr %8, i64 8
  %10 = load ptr, ptr %9, align 8
  tail call void %10(ptr noundef nonnull align 8 dereferenceable(24) %2) #1
  br label %11

11:                                               ; preds = %7, %3
  store ptr null, ptr %0, align 8, !tbaa !5
  br label %12

12:                                               ; preds = %11, %1
  ret void
}

attributes #0 = { mustprogress 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 = { 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, !7, i64 0}
!6 = !{!"_ZTS4Span", !7, i64 0}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!11, !12, i64 8}
!11 = !{!"_ZTS9SpanInner", !12, i64 8, !6, i64 16}
!12 = !{!"long", !8, i64 0}
!13 = !{!14, !14, i64 0}
!14 = !{!"vtable pointer", !9, i64 0}


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