; LLVM IR from gem5/gem5 :: ext/systemc/src/sysc/utils/sc_string.ll (ZN5sc_dt13sc_string_oldaSERKS0_)

; 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.sc_dt::sc_string_old" = type { ptr }
%"class.sc_dt::sc_string_rep" = type { i32, i32, ptr }

; Function Attrs: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN5sc_dt13sc_string_repD2Ev(ptr noundef nonnull align 8 dereferenceable(16)) unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZN5sc_dt13sc_string_oldaSERKS0_(ptr noundef nonnull align 8 dereferenceable(8) %0, ptr noundef nonnull align 8 dereferenceable(8) %1) #1 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %6 = load ptr, ptr %4, align 8
  %7 = load ptr, ptr %5, align 8, !tbaa !5
  %8 = icmp eq ptr %7, %6
  br i1 %8, label %9, label %10

9:                                                ; preds = %2
  store ptr %6, ptr %3, align 8
  br label %33

10:                                               ; preds = %2
  %11 = getelementptr inbounds %"class.sc_dt::sc_string_old", ptr %6, i32 0, i32 0
  %12 = load ptr, ptr %11, align 8, !tbaa !9
  %13 = getelementptr inbounds %"class.sc_dt::sc_string_rep", ptr %12, i32 0, i32 0
  %14 = load i32, ptr %13, align 8, !tbaa !11
  %15 = add nsw i32 %14, -1
  store i32 %15, ptr %13, align 8, !tbaa !11
  %16 = icmp eq i32 %15, 0
  br i1 %16, label %17, label %23

17:                                               ; preds = %10
  %18 = getelementptr inbounds %"class.sc_dt::sc_string_old", ptr %6, i32 0, i32 0
  %19 = load ptr, ptr %18, align 8, !tbaa !9
  %20 = icmp eq ptr %19, null
  br i1 %20, label %22, label %21

21:                                               ; preds = %17
  call void @_ZN5sc_dt13sc_string_repD2Ev(ptr noundef nonnull align 8 dereferenceable(16) %19) #2
  call void @_ZdlPvm(ptr noundef %19, i64 noundef 16) #3
  br label %22

22:                                               ; preds = %21, %17
  br label %23

23:                                               ; preds = %22, %10
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = getelementptr inbounds %"class.sc_dt::sc_string_old", ptr %24, i32 0, i32 0
  %26 = load ptr, ptr %25, align 8, !tbaa !9
  %27 = getelementptr inbounds %"class.sc_dt::sc_string_old", ptr %6, i32 0, i32 0
  store ptr %26, ptr %27, align 8, !tbaa !9
  %28 = getelementptr inbounds %"class.sc_dt::sc_string_old", ptr %6, i32 0, i32 0
  %29 = load ptr, ptr %28, align 8, !tbaa !9
  %30 = getelementptr inbounds %"class.sc_dt::sc_string_rep", ptr %29, i32 0, i32 0
  %31 = load i32, ptr %30, align 8, !tbaa !11
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %30, align 8, !tbaa !11
  store ptr %6, ptr %3, align 8
  br label %33

33:                                               ; preds = %23, %9
  %34 = load ptr, ptr %3, align 8
  ret ptr %34
}

attributes #0 = { nobuiltin 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 = { nounwind }
attributes #3 = { builtin 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 = !{!"_ZTSN5sc_dt13sc_string_oldE", !6, i64 0}
!11 = !{!12, !13, i64 0}
!12 = !{!"_ZTSN5sc_dt13sc_string_repE", !13, i64 0, !13, i64 4, !6, i64 8}
!13 = !{!"int", !7, i64 0}


; 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: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN5sc_dt13sc_string_repD2Ev(ptr noundef nonnull align 8 dereferenceable(16)) unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZN5sc_dt13sc_string_oldaSERKS0_(ptr noundef nonnull returned align 8 dereferenceable(8) %0, ptr noundef nonnull readonly align 8 dereferenceable(8) %1) local_unnamed_addr #1 align 2 {
  %3 = icmp eq ptr %1, %0
  br i1 %3, label %14, label %4

4:                                                ; preds = %2
  %5 = load ptr, ptr %0, align 8, !tbaa !5
  %6 = load i32, ptr %5, align 8, !tbaa !10
  %7 = add nsw i32 %6, -1
  store i32 %7, ptr %5, align 8, !tbaa !10
  %8 = icmp eq i32 %7, 0
  br i1 %8, label %9, label %10

9:                                                ; preds = %4
  tail call void @_ZN5sc_dt13sc_string_repD2Ev(ptr noundef nonnull align 8 dereferenceable(16) %5) #2
  tail call void @_ZdlPvm(ptr noundef nonnull %5, i64 noundef 16) #3
  br label %10

10:                                               ; preds = %9, %4
  %11 = load ptr, ptr %1, align 8, !tbaa !5
  store ptr %11, ptr %0, align 8, !tbaa !5
  %12 = load i32, ptr %11, align 8, !tbaa !10
  %13 = add nsw i32 %12, 1
  store i32 %13, ptr %11, align 8, !tbaa !10
  br label %14

14:                                               ; preds = %2, %10
  ret ptr %0
}

attributes #0 = { nobuiltin 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 = { nounwind }
attributes #3 = { builtin 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 = !{!"_ZTSN5sc_dt13sc_string_oldE", !7, i64 0}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!11, !12, i64 0}
!11 = !{!"_ZTSN5sc_dt13sc_string_repE", !12, i64 0, !12, i64 4, !7, i64 8}
!12 = !{!"int", !8, i64 0}


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