; LLVM IR from dynexcoin/Dynex :: src/Common/StringView.ll (ZNK6Common10StringView6unheadEm)

; 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.Common::StringView" = type { ptr, i64 }

@.str = external hidden unnamed_addr constant [29 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [75 x i8], align 1
@.str.6 = external hidden unnamed_addr constant [17 x i8], align 1
@__PRETTY_FUNCTION__._ZNK6Common10StringView6unheadEm = external hidden unnamed_addr constant [50 x i8], align 1

; Function Attrs: noreturn nounwind
declare void @__assert_fail(ptr noundef, ptr noundef, i32 noundef, ptr noundef) #0

; Function Attrs: mustprogress uwtable
define dso_local void @_ZNK6Common10StringView6unheadEm(ptr dead_on_unwind noalias writable sret(%"class.Common::StringView") align 8 %0, ptr noundef nonnull align 8 dereferenceable(16) %1, i64 noundef %2) #1 align 2 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  store ptr %0, ptr %4, align 8
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i64 %2, ptr %6, align 8, !tbaa !9
  %7 = load ptr, ptr %5, align 8
  %8 = getelementptr inbounds %"class.Common::StringView", ptr %7, i32 0, i32 0
  %9 = load ptr, ptr %8, align 8, !tbaa !11
  %10 = icmp ne ptr %9, null
  br i1 %10, label %15, label %11

11:                                               ; preds = %3
  %12 = getelementptr inbounds %"class.Common::StringView", ptr %7, i32 0, i32 1
  %13 = load i64, ptr %12, align 8, !tbaa !13
  %14 = icmp eq i64 %13, 0
  br label %15

15:                                               ; preds = %11, %3
  %16 = phi i1 [ true, %3 ], [ %14, %11 ]
  br i1 %16, label %17, label %18

17:                                               ; preds = %15
  br label %20

18:                                               ; preds = %15
  call void @__assert_fail(ptr noundef @.str, ptr noundef @.str.2, i32 noundef 344, ptr noundef @__PRETTY_FUNCTION__._ZNK6Common10StringView6unheadEm) #2
  unreachable

19:                                               ; No predecessors!
  br label %20

20:                                               ; preds = %19, %17
  %21 = load i64, ptr %6, align 8, !tbaa !9
  %22 = getelementptr inbounds %"class.Common::StringView", ptr %7, i32 0, i32 1
  %23 = load i64, ptr %22, align 8, !tbaa !13
  %24 = icmp ule i64 %21, %23
  br i1 %24, label %25, label %26

25:                                               ; preds = %20
  br label %28

26:                                               ; preds = %20
  call void @__assert_fail(ptr noundef @.str.6, ptr noundef @.str.2, i32 noundef 345, ptr noundef @__PRETTY_FUNCTION__._ZNK6Common10StringView6unheadEm) #2
  unreachable

27:                                               ; No predecessors!
  br label %28

28:                                               ; preds = %27, %25
  %29 = getelementptr inbounds %"class.Common::StringView", ptr %7, i32 0, i32 0
  %30 = load ptr, ptr %29, align 8, !tbaa !11
  %31 = load i64, ptr %6, align 8, !tbaa !9
  %32 = getelementptr inbounds i8, ptr %30, i64 %31
  %33 = getelementptr inbounds %"class.Common::StringView", ptr %7, i32 0, i32 1
  %34 = load i64, ptr %33, align 8, !tbaa !13
  %35 = load i64, ptr %6, align 8, !tbaa !9
  %36 = sub i64 %34, %35
  call void @_ZN6Common10StringViewC1EPKcm(ptr noundef nonnull align 8 dereferenceable(16) %0, ptr noundef %32, i64 noundef %36)
  ret void
}

declare void @_ZN6Common10StringViewC1EPKcm(ptr, ptr, i64)

attributes #0 = { noreturn nounwind "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" }
attributes #2 = { noreturn 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, !6, i64 0}
!12 = !{!"_ZTSN6Common10StringViewE", !6, i64 0, !10, i64 8}
!13 = !{!12, !10, 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"

%"class.Common::StringView" = type { ptr, i64 }

@.str = external hidden unnamed_addr constant [29 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [75 x i8], align 1
@.str.6 = external hidden unnamed_addr constant [17 x i8], align 1
@__PRETTY_FUNCTION__._ZNK6Common10StringView6unheadEm = external hidden unnamed_addr constant [50 x i8], align 1

; Function Attrs: noreturn nounwind
declare void @__assert_fail(ptr noundef, ptr noundef, i32 noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local void @_ZNK6Common10StringView6unheadEm(ptr dead_on_unwind noalias writable sret(%"class.Common::StringView") align 8 %0, ptr nocapture noundef nonnull readonly align 8 dereferenceable(16) %1, i64 noundef %2) local_unnamed_addr #1 align 2 {
  %4 = load ptr, ptr %1, align 8, !tbaa !5
  %.not = icmp ne ptr %4, null
  %5 = getelementptr inbounds i8, ptr %1, i64 8
  %6 = load i64, ptr %5, align 8
  %7 = icmp eq i64 %6, 0
  %or.cond = select i1 %.not, i1 true, i1 %7
  br i1 %or.cond, label %.critedge, label %8

8:                                                ; preds = %3
  tail call void @__assert_fail(ptr noundef nonnull @.str, ptr noundef nonnull @.str.2, i32 noundef 344, ptr noundef nonnull @__PRETTY_FUNCTION__._ZNK6Common10StringView6unheadEm) #2
  unreachable

.critedge:                                        ; preds = %3
  %.not4 = icmp ult i64 %6, %2
  br i1 %.not4, label %9, label %10

9:                                                ; preds = %.critedge
  tail call void @__assert_fail(ptr noundef nonnull @.str.6, ptr noundef nonnull @.str.2, i32 noundef 345, ptr noundef nonnull @__PRETTY_FUNCTION__._ZNK6Common10StringView6unheadEm) #2
  unreachable

10:                                               ; preds = %.critedge
  %11 = getelementptr inbounds i8, ptr %4, i64 %2
  %12 = sub i64 %6, %2
  tail call void @_ZN6Common10StringViewC1EPKcm(ptr noundef nonnull align 8 dereferenceable(16) %0, ptr noundef %11, i64 noundef %12)
  ret void
}

declare void @_ZN6Common10StringViewC1EPKcm(ptr, ptr, i64) local_unnamed_addr

attributes #0 = { noreturn nounwind "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" }
attributes #2 = { noreturn 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, !7, i64 0}
!6 = !{!"_ZTSN6Common10StringViewE", !7, i64 0, !10, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"long", !8, i64 0}


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