; LLVM IR from kkumatani/distant_speech_recognition :: btk20_src/common/memory_manager.ll (ZN15MemoryAllocator10deleteElemEPv)

; 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.MemoryAllocator = type { i64, i32, %"class.std::__cxx11::list", i32, i32 }
%"class.std::__cxx11::list" = type { %"class.std::__cxx11::_List_base" }
%"class.std::__cxx11::_List_base" = type { %"struct.std::__cxx11::_List_base<char *, std::allocator<char *>>::_List_impl" }
%"struct.std::__cxx11::_List_base<char *, std::allocator<char *>>::_List_impl" = type { %"struct.std::__detail::_List_node_header" }
%"struct.std::__detail::_List_node_header" = type { %"struct.std::__detail::_List_node_base", i64 }
%"struct.std::__detail::_List_node_base" = type { ptr, ptr }

; Function Attrs: nounwind
declare void @free(ptr noundef) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN15MemoryAllocator10deleteElemEPv(ptr noundef nonnull align 8 dereferenceable(48) %0, ptr noundef %1) #1 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  %5 = load ptr, ptr %3, align 8
  %6 = load ptr, ptr %4, align 8, !tbaa !5
  %7 = icmp eq ptr %6, null
  br i1 %7, label %8, label %9

8:                                                ; preds = %2
  br label %14

9:                                                ; preds = %2
  %10 = getelementptr inbounds %class.MemoryAllocator, ptr %5, i32 0, i32 3
  %11 = load i32, ptr %10, align 8, !tbaa !9
  %12 = add i32 %11, -1
  store i32 %12, ptr %10, align 8, !tbaa !9
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  call void @free(ptr noundef %13) #2
  br label %14

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

attributes #0 = { 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 #1 = { 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 #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, !12, i64 40}
!10 = !{!"_ZTS15MemoryAllocator", !11, i64 0, !12, i64 8, !13, i64 16, !12, i64 40, !12, i64 44}
!11 = !{!"long", !7, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!"_ZTSNSt7__cxx114listIPcSaIS1_EEE", !14, i64 0}
!14 = !{!"_ZTSNSt7__cxx1110_List_baseIPcSaIS1_EEE", !15, i64 0}
!15 = !{!"_ZTSNSt7__cxx1110_List_baseIPcSaIS1_EE10_List_implE", !16, i64 0}
!16 = !{!"_ZTSNSt8__detail17_List_node_headerE", !17, i64 0, !11, i64 16}
!17 = !{!"_ZTSNSt8__detail15_List_node_baseE", !6, i64 0, !6, i64 8}


; 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 allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind willreturn memory(argmem: readwrite, inaccessiblemem: readwrite) uwtable
define dso_local void @_ZN15MemoryAllocator10deleteElemEPv(ptr nocapture noundef nonnull align 8 dereferenceable(48) %0, ptr noundef %1) local_unnamed_addr #1 align 2 {
  %3 = icmp eq ptr %1, null
  br i1 %3, label %8, label %4

4:                                                ; preds = %2
  %5 = getelementptr inbounds i8, ptr %0, i64 40
  %6 = load i32, ptr %5, align 8, !tbaa !5
  %7 = add i32 %6, -1
  store i32 %7, ptr %5, align 8, !tbaa !5
  tail call void @free(ptr noundef nonnull %1) #2
  br label %8

8:                                                ; preds = %2, %4
  ret void
}

attributes #0 = { 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 #1 = { mustprogress nounwind willreturn memory(argmem: readwrite, inaccessiblemem: readwrite) 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, !10, i64 40}
!6 = !{!"_ZTS15MemoryAllocator", !7, i64 0, !10, i64 8, !11, i64 16, !10, i64 40, !10, i64 44}
!7 = !{!"long", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!"_ZTSNSt7__cxx114listIPcSaIS1_EEE", !12, i64 0}
!12 = !{!"_ZTSNSt7__cxx1110_List_baseIPcSaIS1_EEE", !13, i64 0}
!13 = !{!"_ZTSNSt7__cxx1110_List_baseIPcSaIS1_EE10_List_implE", !14, i64 0}
!14 = !{!"_ZTSNSt8__detail17_List_node_headerE", !15, i64 0, !7, i64 16}
!15 = !{!"_ZTSNSt8__detail15_List_node_baseE", !16, i64 0, !16, i64 8}
!16 = !{!"any pointer", !8, i64 0}


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