; LLVM IR from vczh/herodb :: Kernel/Source/Vlpp.ll (ZNK2vl6stream10FileStream7CanPeekEv)

; 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.vl::stream::FileStream" = type { %"class.vl::Object", i32, ptr, %"class.vl::stream::IStream" }
%"class.vl::Object" = type { ptr }
%"class.vl::stream::IStream" = type { %"class.vl::Interface" }
%"class.vl::Interface" = type { ptr }

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_ZNK2vl6stream10FileStream7CanPeekEv(ptr noundef nonnull align 8 dereferenceable(24) %0) unnamed_addr #0 align 2 {
  %2 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %3 = load ptr, ptr %2, align 8
  %4 = getelementptr inbounds %"class.vl::stream::FileStream", ptr %3, i32 0, i32 2
  %5 = load ptr, ptr %4, align 8, !tbaa !9
  %6 = icmp ne ptr %5, null
  br i1 %6, label %7, label %17

7:                                                ; preds = %1
  %8 = getelementptr inbounds %"class.vl::stream::FileStream", ptr %3, i32 0, i32 1
  %9 = load i32, ptr %8, align 8, !tbaa !13
  %10 = icmp eq i32 %9, 0
  br i1 %10, label %15, label %11

11:                                               ; preds = %7
  %12 = getelementptr inbounds %"class.vl::stream::FileStream", ptr %3, i32 0, i32 1
  %13 = load i32, ptr %12, align 8, !tbaa !13
  %14 = icmp eq i32 %13, 2
  br label %15

15:                                               ; preds = %11, %7
  %16 = phi i1 [ true, %7 ], [ %14, %11 ]
  br label %17

17:                                               ; preds = %15, %1
  %18 = phi i1 [ false, %1 ], [ %16, %15 ]
  ret i1 %18
}

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 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !6, i64 16}
!10 = !{!"_ZTSN2vl6stream10FileStreamE", !11, i64 0, !12, i64 8, !6, i64 16}
!11 = !{!"_ZTSN2vl6ObjectE"}
!12 = !{!"_ZTSN2vl6stream10FileStream11AccessRightE", !7, i64 0}
!13 = !{!10, !12, 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 nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef zeroext i1 @_ZNK2vl6stream10FileStream7CanPeekEv(ptr nocapture noundef nonnull readonly align 8 dereferenceable(24) %0) unnamed_addr #0 align 2 {
  %2 = getelementptr inbounds i8, ptr %0, i64 16
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %.not = icmp ne ptr %3, null
  %4 = getelementptr inbounds i8, ptr %0, i64 8
  %5 = load i32, ptr %4, align 8
  %6 = and i32 %5, -3
  %spec.select = icmp eq i32 %6, 0
  %7 = select i1 %.not, i1 %spec.select, i1 false
  ret i1 %7
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) 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, !11, i64 16}
!6 = !{!"_ZTSN2vl6stream10FileStreamE", !7, i64 0, !8, i64 8, !11, i64 16}
!7 = !{!"_ZTSN2vl6ObjectE"}
!8 = !{!"_ZTSN2vl6stream10FileStream11AccessRightE", !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C++ TBAA"}
!11 = !{!"any pointer", !9, i64 0}


; Effective O3 passes: EarlyCSEPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass