; LLVM IR from AF-GRILL/DISPluginForUnreal :: Source/ThirdParty/include/utils/DataStream.ll (ZN3DIS10DataStream6DoReadEPcm)

; 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.DIS::DataStream" = type { %"class.std::vector", i64, i64, i32, i32 }
%"class.std::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<char, std::allocator<char>>::_Vector_impl" }
%"struct.std::_Vector_base<char, std::allocator<char>>::_Vector_impl" = type { %"struct.std::_Vector_base<char, std::allocator<char>>::_Vector_impl_data" }
%"struct.std::_Vector_base<char, std::allocator<char>>::_Vector_impl_data" = type { ptr, ptr, ptr }

; 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
define dso_local void @_ZN3DIS10DataStream6DoReadEPcm(ptr noundef nonnull align 8 dereferenceable(48) %0, ptr noundef %1, i64 noundef %2) #1 align 2 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i64, 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
  store i64 %2, ptr %6, align 8, !tbaa !9
  %8 = load ptr, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !11
  br label %9

9:                                                ; preds = %28, %3
  %10 = load i32, ptr %7, align 4, !tbaa !11
  %11 = zext i32 %10 to i64
  %12 = load i64, ptr %6, align 8, !tbaa !9
  %13 = icmp ult i64 %11, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %31

15:                                               ; preds = %9
  %16 = getelementptr inbounds %"class.DIS::DataStream", ptr %8, i32 0, i32 0
  %17 = getelementptr inbounds %"class.DIS::DataStream", ptr %8, i32 0, i32 1
  %18 = load i64, ptr %17, align 8, !tbaa !13
  %19 = load i32, ptr %7, align 4, !tbaa !11
  %20 = zext i32 %19 to i64
  %21 = add i64 %18, %20
  %22 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt6vectorIcSaIcEE2atEm(ptr noundef nonnull align 8 dereferenceable(24) %16, i64 noundef %21)
  %23 = load i8, ptr %22, align 1, !tbaa !20
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = load i32, ptr %7, align 4, !tbaa !11
  %26 = zext i32 %25 to i64
  %27 = getelementptr inbounds i8, ptr %24, i64 %26
  store i8 %23, ptr %27, align 1, !tbaa !20
  br label %28

28:                                               ; preds = %15
  %29 = load i32, ptr %7, align 4, !tbaa !11
  %30 = add i32 %29, 1
  store i32 %30, ptr %7, align 4, !tbaa !11
  br label %9, !llvm.loop !21

31:                                               ; preds = %14
  ret void
}

; Function Attrs: mustprogress uwtable
declare dso_local noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt6vectorIcSaIcEE2atEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #1 align 2

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 = { 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 = !{!"long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!14, !10, i64 24}
!14 = !{!"_ZTSN3DIS10DataStreamE", !15, i64 0, !10, i64 24, !10, i64 32, !19, i64 40, !19, i64 44}
!15 = !{!"_ZTSSt6vectorIcSaIcEE", !16, i64 0}
!16 = !{!"_ZTSSt12_Vector_baseIcSaIcEE", !17, i64 0}
!17 = !{!"_ZTSNSt12_Vector_baseIcSaIcEE12_Vector_implE", !18, i64 0}
!18 = !{!"_ZTSNSt12_Vector_baseIcSaIcEE17_Vector_impl_dataE", !6, i64 0, !6, i64 8, !6, i64 16}
!19 = !{!"_ZTSN3DIS6EndianE", !7, i64 0}
!20 = !{!7, !7, i64 0}
!21 = distinct !{!21, !22}
!22 = !{!"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
define dso_local void @_ZN3DIS10DataStream6DoReadEPcm(ptr noundef nonnull align 8 dereferenceable(48) %0, ptr nocapture noundef writeonly %1, i64 noundef %2) local_unnamed_addr #0 align 2 {
  %.not = icmp eq i64 %2, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %3
  %4 = getelementptr inbounds i8, ptr %0, i64 24
  br label %5

._crit_edge:                                      ; preds = %5, %3
  ret void

5:                                                ; preds = %.lr.ph, %5
  %6 = phi i64 [ 0, %.lr.ph ], [ %13, %5 ]
  %.07 = phi i32 [ 0, %.lr.ph ], [ %12, %5 ]
  %7 = load i64, ptr %4, align 8, !tbaa !5
  %8 = add i64 %7, %6
  %9 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt6vectorIcSaIcEE2atEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %8)
  %10 = load i8, ptr %9, align 1, !tbaa !16
  %11 = getelementptr inbounds i8, ptr %1, i64 %6
  store i8 %10, ptr %11, align 1, !tbaa !16
  %12 = add i32 %.07, 1
  %13 = zext i32 %12 to i64
  %14 = icmp ult i64 %13, %2
  br i1 %14, label %5, label %._crit_edge, !llvm.loop !17
}

; Function Attrs: mustprogress uwtable
declare dso_local noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt6vectorIcSaIcEE2atEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #0 align 2

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" }

!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, !14, i64 24}
!6 = !{!"_ZTSN3DIS10DataStreamE", !7, i64 0, !14, i64 24, !14, i64 32, !15, i64 40, !15, i64 44}
!7 = !{!"_ZTSSt6vectorIcSaIcEE", !8, i64 0}
!8 = !{!"_ZTSSt12_Vector_baseIcSaIcEE", !9, i64 0}
!9 = !{!"_ZTSNSt12_Vector_baseIcSaIcEE12_Vector_implE", !10, i64 0}
!10 = !{!"_ZTSNSt12_Vector_baseIcSaIcEE17_Vector_impl_dataE", !11, i64 0, !11, i64 8, !11, i64 16}
!11 = !{!"any pointer", !12, i64 0}
!12 = !{!"omnipotent char", !13, i64 0}
!13 = !{!"Simple C++ TBAA"}
!14 = !{!"long", !12, i64 0}
!15 = !{!"_ZTSN3DIS6EndianE", !12, i64 0}
!16 = !{!12, !12, i64 0}
!17 = distinct !{!17, !18}
!18 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass