; LLVM IR from HiroIshida/tinyfk :: urdf_parser/tinyxml/tinyxml.ll (ZNK9TiXmlNode17FirstChildElementEv)

; 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"

; 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 nounwind uwtable
declare dso_local noundef ptr @_ZNK9TiXmlNode10FirstChildEv(ptr noundef nonnull align 8 dereferenceable(104)) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef ptr @_ZNK9TiXmlNode11NextSiblingEv(ptr noundef nonnull align 8 dereferenceable(104)) #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_ZNK9TiXmlNode17FirstChildElementEv(ptr noundef nonnull align 8 dereferenceable(104) %0) #2 align 2 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  %6 = load ptr, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %7 = call noundef ptr @_ZNK9TiXmlNode10FirstChildEv(ptr noundef nonnull align 8 dereferenceable(104) %6)
  store ptr %7, ptr %4, align 8, !tbaa !5
  br label %8

8:                                                ; preds = %25, %1
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = icmp ne ptr %9, null
  br i1 %10, label %11, label %28

11:                                               ; preds = %8
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = load ptr, ptr %12, align 8, !tbaa !9
  %14 = getelementptr inbounds ptr, ptr %13, i64 5
  %15 = load ptr, ptr %14, align 8
  %16 = call noundef ptr %15(ptr noundef nonnull align 8 dereferenceable(104) %12)
  %17 = icmp ne ptr %16, null
  br i1 %17, label %18, label %24

18:                                               ; preds = %11
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  %20 = load ptr, ptr %19, align 8, !tbaa !9
  %21 = getelementptr inbounds ptr, ptr %20, i64 5
  %22 = load ptr, ptr %21, align 8
  %23 = call noundef ptr %22(ptr noundef nonnull align 8 dereferenceable(104) %19)
  store ptr %23, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %29

24:                                               ; preds = %11
  br label %25

25:                                               ; preds = %24
  %26 = load ptr, ptr %4, align 8, !tbaa !5
  %27 = call noundef ptr @_ZNK9TiXmlNode11NextSiblingEv(ptr noundef nonnull align 8 dereferenceable(104) %26)
  store ptr %27, ptr %4, align 8, !tbaa !5
  br label %8, !llvm.loop !11

28:                                               ; preds = %8
  store ptr null, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %29

29:                                               ; preds = %28, %18
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  %30 = load ptr, ptr %2, align 8
  ret ptr %30
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { 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 #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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"vtable pointer", !8, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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 nounwind uwtable
declare dso_local noundef ptr @_ZNK9TiXmlNode10FirstChildEv(ptr noundef nonnull align 8 dereferenceable(104)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef ptr @_ZNK9TiXmlNode11NextSiblingEv(ptr noundef nonnull align 8 dereferenceable(104)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_ZNK9TiXmlNode17FirstChildElementEv(ptr noundef nonnull align 8 dereferenceable(104) %0) local_unnamed_addr #1 align 2 {
  %2 = tail call noundef ptr @_ZNK9TiXmlNode10FirstChildEv(ptr noundef nonnull align 8 dereferenceable(104) %0)
  %.not9 = icmp eq ptr %2, null
  br i1 %.not9, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %1, %12
  %.010 = phi ptr [ %13, %12 ], [ %2, %1 ]
  %3 = load ptr, ptr %.010, align 8, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %3, i64 40
  %5 = load ptr, ptr %4, align 8
  %6 = tail call noundef ptr %5(ptr noundef nonnull align 8 dereferenceable(104) %.010)
  %.not7 = icmp eq ptr %6, null
  br i1 %.not7, label %12, label %7

7:                                                ; preds = %.lr.ph
  %8 = load ptr, ptr %.010, align 8, !tbaa !5
  %9 = getelementptr inbounds i8, ptr %8, i64 40
  %10 = load ptr, ptr %9, align 8
  %11 = tail call noundef ptr %10(ptr noundef nonnull align 8 dereferenceable(104) %.010)
  br label %.loopexit

12:                                               ; preds = %.lr.ph
  %13 = tail call noundef ptr @_ZNK9TiXmlNode11NextSiblingEv(ptr noundef nonnull align 8 dereferenceable(104) %.010)
  %.not = icmp eq ptr %13, null
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !8

.loopexit:                                        ; preds = %12, %1, %7
  %.06 = phi ptr [ %11, %7 ], [ null, %1 ], [ null, %12 ]
  ret ptr %.06
}

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 = { 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, !6, i64 0}
!6 = !{!"vtable pointer", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass