; LLVM IR from thepowersgang/mrustc :: src/rc_string.ll (ZN8RcStringD2Ev)

; 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.RcString = type { ptr }
%"struct.RcString::Inner" = type { i32, i32, i32, [1 x i32] }

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN8RcStringD2Ev(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 %class.RcString, 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 %23

7:                                                ; preds = %1
  %8 = getelementptr inbounds %class.RcString, ptr %3, i32 0, i32 0
  %9 = load ptr, ptr %8, align 8, !tbaa !9
  %10 = getelementptr inbounds %"struct.RcString::Inner", ptr %9, i32 0, i32 0
  %11 = load i32, ptr %10, align 4, !tbaa !11
  %12 = sub i32 %11, 1
  store i32 %12, ptr %10, align 4, !tbaa !11
  %13 = getelementptr inbounds %class.RcString, ptr %3, i32 0, i32 0
  %14 = load ptr, ptr %13, align 8, !tbaa !9
  %15 = getelementptr inbounds %"struct.RcString::Inner", ptr %14, i32 0, i32 0
  %16 = load i32, ptr %15, align 4, !tbaa !11
  %17 = icmp eq i32 %16, 0
  br i1 %17, label %18, label %21

18:                                               ; preds = %7
  %19 = getelementptr inbounds %class.RcString, ptr %3, i32 0, i32 0
  %20 = load ptr, ptr %19, align 8, !tbaa !9
  call void @free(ptr noundef %20) #2
  br label %21

21:                                               ; preds = %18, %7
  %22 = getelementptr inbounds %class.RcString, ptr %3, i32 0, i32 0
  store ptr null, ptr %22, align 8, !tbaa !9
  br label %23

23:                                               ; preds = %21, %1
  ret void
}

; Function Attrs: nounwind
declare void @free(ptr noundef) #1

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 "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, !6, i64 0}
!10 = !{!"_ZTS8RcString", !6, i64 0}
!11 = !{!12, !13, i64 0}
!12 = !{!"_ZTSN8RcString5InnerE", !13, i64 0, !13, i64 4, !13, i64 8, !7, i64 12}
!13 = !{!"int", !7, 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 willreturn uwtable
define dso_local void @_ZN8RcStringD2Ev(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 %9, label %3

3:                                                ; preds = %1
  %4 = load i32, ptr %2, align 4, !tbaa !10
  %5 = add i32 %4, -1
  store i32 %5, ptr %2, align 4, !tbaa !10
  %6 = icmp eq i32 %5, 0
  br i1 %6, label %7, label %8

7:                                                ; preds = %3
  tail call void @free(ptr noundef nonnull %2) #2
  br label %8

8:                                                ; preds = %7, %3
  store ptr null, ptr %0, align 8, !tbaa !5
  br label %9

9:                                                ; preds = %8, %1
  ret void
}

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #1

attributes #0 = { mustprogress nounwind willreturn 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 nounwind willreturn allockind("free") memory(argmem: readwrite, 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 }

!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 = !{!"_ZTS8RcString", !7, i64 0}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!11, !12, i64 0}
!11 = !{!"_ZTSN8RcString5InnerE", !12, i64 0, !12, i64 4, !12, i64 8, !8, i64 12}
!12 = !{!"int", !8, i64 0}


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