; LLVM IR from dynexcoin/Dynex :: src/Common/StringView.ll (ZNK6Common10StringView4lastEv)

; 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.5 = external hidden unnamed_addr constant [9 x i8], align 1
@__PRETTY_FUNCTION__._ZNK6Common10StringView4lastEv = external hidden unnamed_addr constant [59 x i8], align 1

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

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef nonnull align 1 dereferenceable(1) ptr @_ZNK6Common10StringView4lastEv(ptr noundef nonnull align 8 dereferenceable(16) %0) #1 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.Common::StringView", ptr %3, i32 0, i32 0
  %5 = load ptr, ptr %4, align 8, !tbaa !9
  %6 = icmp ne ptr %5, null
  br i1 %6, label %11, label %7

7:                                                ; preds = %1
  %8 = getelementptr inbounds %"class.Common::StringView", ptr %3, i32 0, i32 1
  %9 = load i64, ptr %8, align 8, !tbaa !12
  %10 = icmp eq i64 %9, 0
  br label %11

11:                                               ; preds = %7, %1
  %12 = phi i1 [ true, %1 ], [ %10, %7 ]
  br i1 %12, label %13, label %14

13:                                               ; preds = %11
  br label %16

14:                                               ; preds = %11
  call void @__assert_fail(ptr noundef @.str, ptr noundef @.str.2, i32 noundef 112, ptr noundef @__PRETTY_FUNCTION__._ZNK6Common10StringView4lastEv) #2
  unreachable

15:                                               ; No predecessors!
  br label %16

16:                                               ; preds = %15, %13
  %17 = getelementptr inbounds %"class.Common::StringView", ptr %3, i32 0, i32 1
  %18 = load i64, ptr %17, align 8, !tbaa !12
  %19 = icmp ugt i64 %18, 0
  br i1 %19, label %20, label %21

20:                                               ; preds = %16
  br label %23

21:                                               ; preds = %16
  call void @__assert_fail(ptr noundef @.str.5, ptr noundef @.str.2, i32 noundef 113, ptr noundef @__PRETTY_FUNCTION__._ZNK6Common10StringView4lastEv) #2
  unreachable

22:                                               ; No predecessors!
  br label %23

23:                                               ; preds = %22, %20
  %24 = getelementptr inbounds %"class.Common::StringView", ptr %3, i32 0, i32 0
  %25 = load ptr, ptr %24, align 8, !tbaa !9
  %26 = getelementptr inbounds %"class.Common::StringView", ptr %3, i32 0, i32 1
  %27 = load i64, ptr %26, align 8, !tbaa !12
  %28 = sub i64 %27, 1
  %29 = getelementptr inbounds i8, ptr %25, i64 %28
  ret ptr %29
}

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 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 = { 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, !6, i64 0}
!10 = !{!"_ZTSN6Common10StringViewE", !6, i64 0, !11, i64 8}
!11 = !{!"long", !7, i64 0}
!12 = !{!10, !11, 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"

@.str = external hidden unnamed_addr constant [29 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [75 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [9 x i8], align 1
@__PRETTY_FUNCTION__._ZNK6Common10StringView4lastEv = external hidden unnamed_addr constant [59 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 nounwind uwtable
define dso_local noundef nonnull align 1 dereferenceable(1) ptr @_ZNK6Common10StringView4lastEv(ptr nocapture noundef nonnull readonly align 8 dereferenceable(16) %0) local_unnamed_addr #1 align 2 {
  %2 = load ptr, ptr %0, align 8, !tbaa !5
  %.not = icmp ne ptr %2, null
  %3 = getelementptr inbounds i8, ptr %0, i64 8
  %4 = load i64, ptr %3, align 8
  %5 = icmp eq i64 %4, 0
  %or.cond = select i1 %.not, i1 true, i1 %5
  br i1 %or.cond, label %.critedge, label %6

6:                                                ; preds = %1
  tail call void @__assert_fail(ptr noundef nonnull @.str, ptr noundef nonnull @.str.2, i32 noundef 112, ptr noundef nonnull @__PRETTY_FUNCTION__._ZNK6Common10StringView4lastEv) #2
  unreachable

.critedge:                                        ; preds = %1
  br i1 %5, label %7, label %8

7:                                                ; preds = %.critedge
  tail call void @__assert_fail(ptr noundef nonnull @.str.5, ptr noundef nonnull @.str.2, i32 noundef 113, ptr noundef nonnull @__PRETTY_FUNCTION__._ZNK6Common10StringView4lastEv) #2
  unreachable

8:                                                ; preds = %.critedge
  %9 = getelementptr i8, ptr %2, i64 %4
  %10 = getelementptr i8, ptr %9, i64 -1
  ret ptr %10
}

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 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 = { 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,IPSCCPPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass