; LLVM IR from thuhcsi/Crystal.TTVS :: TinyXML/tinyxml.ll (ZN9TiXmlNode17FirstChildElementEPKc)

; 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 uwtable
declare dso_local noundef ptr @_ZN9TiXmlNode10FirstChildEPKc(ptr noundef nonnull align 8 dereferenceable(96), ptr noundef) #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_ZN9TiXmlNode11NextSiblingEPKc(ptr noundef nonnull align 8 dereferenceable(96), ptr noundef) #1 align 2

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

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_ZN9TiXmlNode17FirstChildElementEPKc(ptr noundef nonnull align 8 dereferenceable(96) %0, ptr noundef %1) #1 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %8 = load ptr, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %9 = load ptr, ptr %5, align 8, !tbaa !5
  %10 = call noundef ptr @_ZN9TiXmlNode10FirstChildEPKc(ptr noundef nonnull align 8 dereferenceable(96) %8, ptr noundef %9)
  store ptr %10, ptr %6, align 8, !tbaa !5
  br label %11

11:                                               ; preds = %22, %2
  %12 = load ptr, ptr %6, align 8, !tbaa !5
  %13 = icmp ne ptr %12, null
  br i1 %13, label %14, label %26

14:                                               ; preds = %11
  %15 = load ptr, ptr %6, align 8, !tbaa !5
  %16 = call noundef ptr @_ZN9TiXmlNode9ToElementEv(ptr noundef nonnull align 8 dereferenceable(96) %15)
  %17 = icmp ne ptr %16, null
  br i1 %17, label %18, label %21

18:                                               ; preds = %14
  %19 = load ptr, ptr %6, align 8, !tbaa !5
  %20 = call noundef ptr @_ZN9TiXmlNode9ToElementEv(ptr noundef nonnull align 8 dereferenceable(96) %19)
  store ptr %20, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %27

21:                                               ; preds = %14
  br label %22

22:                                               ; preds = %21
  %23 = load ptr, ptr %6, align 8, !tbaa !5
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = call noundef ptr @_ZN9TiXmlNode11NextSiblingEPKc(ptr noundef nonnull align 8 dereferenceable(96) %23, ptr noundef %24)
  store ptr %25, ptr %6, align 8, !tbaa !5
  br label %11, !llvm.loop !9

26:                                               ; preds = %11
  store ptr null, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %27

27:                                               ; preds = %26, %18
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  %28 = load ptr, ptr %3, align 8
  ret ptr %28
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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" }
attributes #2 = { 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 #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 uwtable
declare dso_local noundef ptr @_ZN9TiXmlNode10FirstChildEPKc(ptr noundef nonnull align 8 dereferenceable(96), ptr noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_ZN9TiXmlNode11NextSiblingEPKc(ptr noundef nonnull align 8 dereferenceable(96), ptr noundef) local_unnamed_addr #0 align 2

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

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_ZN9TiXmlNode17FirstChildElementEPKc(ptr noundef nonnull align 8 dereferenceable(96) %0, ptr noundef %1) local_unnamed_addr #0 align 2 {
  %3 = tail call noundef ptr @_ZN9TiXmlNode10FirstChildEPKc(ptr noundef nonnull align 8 dereferenceable(96) %0, ptr noundef %1)
  %.not11 = icmp eq ptr %3, null
  br i1 %.not11, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %2, %7
  %.012 = phi ptr [ %8, %7 ], [ %3, %2 ]
  %4 = tail call noundef ptr @_ZN9TiXmlNode9ToElementEv(ptr noundef nonnull align 8 dereferenceable(96) %.012)
  %.not9 = icmp eq ptr %4, null
  br i1 %.not9, label %7, label %5

5:                                                ; preds = %.lr.ph
  %6 = tail call noundef ptr @_ZN9TiXmlNode9ToElementEv(ptr noundef nonnull align 8 dereferenceable(96) %.012)
  br label %.loopexit

7:                                                ; preds = %.lr.ph
  %8 = tail call noundef ptr @_ZN9TiXmlNode11NextSiblingEPKc(ptr noundef nonnull align 8 dereferenceable(96) %.012, ptr noundef %1)
  %.not = icmp eq ptr %8, null
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !5

.loopexit:                                        ; preds = %7, %2, %5
  %.08 = phi ptr [ %6, %5 ], [ null, %2 ], [ null, %7 ]
  ret ptr %.08
}

attributes #0 = { 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 #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" }

!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,SROAPass,SimplifyCFGPass,TailCallElimPass