; LLVM IR from thuhcsi/Crystal.TTVS :: TinyXML/tinyxml.ll (ZN9TiXmlNode17FirstChildElementEv)

; 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 @_ZN9TiXmlNode10FirstChildEv(ptr noundef nonnull align 8 dereferenceable(96)) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef ptr @_ZN9TiXmlNode11NextSiblingEv(ptr noundef nonnull align 8 dereferenceable(96)) #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_ZN9TiXmlNode17FirstChildElementEv(ptr noundef nonnull align 8 dereferenceable(96) %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 @_ZN9TiXmlNode10FirstChildEv(ptr noundef nonnull align 8 dereferenceable(96) %6)
  store ptr %7, ptr %4, align 8, !tbaa !5
  br label %8

8:                                                ; preds = %19, %1
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = icmp ne ptr %9, null
  br i1 %10, label %11, label %22

11:                                               ; preds = %8
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = call noundef ptr @_ZN9TiXmlNode9ToElementEv(ptr noundef nonnull align 8 dereferenceable(96) %12)
  %14 = icmp ne ptr %13, null
  br i1 %14, label %15, label %18

15:                                               ; preds = %11
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = call noundef ptr @_ZN9TiXmlNode9ToElementEv(ptr noundef nonnull align 8 dereferenceable(96) %16)
  store ptr %17, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %23

18:                                               ; preds = %11
  br label %19

19:                                               ; preds = %18
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  %21 = call noundef ptr @_ZN9TiXmlNode11NextSiblingEv(ptr noundef nonnull align 8 dereferenceable(96) %20)
  store ptr %21, ptr %4, align 8, !tbaa !5
  br label %8, !llvm.loop !9

22:                                               ; preds = %8
  store ptr null, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %23

23:                                               ; preds = %22, %15
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  %24 = load ptr, ptr %2, align 8
  ret ptr %24
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef ptr @_ZN9TiXmlNode9ToElementEv(ptr noundef nonnull align 8 dereferenceable(96)) #1 align 2

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 = distinct !{!9, !10}
!10 = !{!"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 @_ZN9TiXmlNode10FirstChildEv(ptr noundef nonnull align 8 dereferenceable(96)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef ptr @_ZN9TiXmlNode11NextSiblingEv(ptr noundef nonnull align 8 dereferenceable(96)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef ptr @_ZN9TiXmlNode17FirstChildElementEv(ptr noundef nonnull align 8 dereferenceable(96) %0) local_unnamed_addr #0 align 2 {
  %2 = tail call noundef ptr @_ZN9TiXmlNode10FirstChildEv(ptr noundef nonnull align 8 dereferenceable(96) %0)
  %.not9 = icmp eq ptr %2, null
  br i1 %.not9, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %1, %6
  %.010 = phi ptr [ %7, %6 ], [ %2, %1 ]
  %3 = tail call noundef ptr @_ZN9TiXmlNode9ToElementEv(ptr noundef nonnull align 8 dereferenceable(96) %.010)
  %.not7 = icmp eq ptr %3, null
  br i1 %.not7, label %6, label %4

4:                                                ; preds = %.lr.ph
  %5 = tail call noundef ptr @_ZN9TiXmlNode9ToElementEv(ptr noundef nonnull align 8 dereferenceable(96) %.010)
  br label %.loopexit

6:                                                ; preds = %.lr.ph
  %7 = tail call noundef ptr @_ZN9TiXmlNode11NextSiblingEv(ptr noundef nonnull align 8 dereferenceable(96) %.010)
  %.not = icmp eq ptr %7, null
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !5

.loopexit:                                        ; preds = %6, %1, %4
  %.06 = phi ptr [ %5, %4 ], [ null, %1 ], [ null, %6 ]
  ret ptr %.06
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef ptr @_ZN9TiXmlNode9ToElementEv(ptr noundef nonnull align 8 dereferenceable(96)) local_unnamed_addr #0 align 2

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" }

!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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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