; LLVM IR from gem5/gem5 :: ext/systemc/src/sysc/utils/sc_string.ll (ZN5sc_dt13sc_string_oldD2Ev)

; 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
define dso_local void @_ZN5sc_dt13sc_string_oldD2Ev(ptr noundef nonnull align 8 dereferenceable(8) %0) unnamed_addr #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.sc_dt::sc_string_old", ptr %3, i32 0, i32 0
  %5 = load ptr, ptr %4, align 8, !tbaa !9
  %6 = getelementptr inbounds %"class.sc_dt::sc_string_rep", ptr %5, i32 0, i32 0
  %7 = load i32, ptr %6, align 8, !tbaa !11
  %8 = add nsw i32 %7, -1
  store i32 %8, ptr %6, align 8, !tbaa !11
  %9 = icmp eq i32 %8, 0
  br i1 %9, label %10, label %16

10:                                               ; preds = %1
  %11 = getelementptr inbounds %"class.sc_dt::sc_string_old", ptr %3, i32 0, i32 0
  %12 = load ptr, ptr %11, align 8, !tbaa !9
  %13 = icmp eq ptr %12, null
  br i1 %13, label %15, label %14

14:                                               ; preds = %10
  call void @_ZN5sc_dt13sc_string_repD2Ev(ptr noundef nonnull align 8 dereferenceable(16) %12) #2
  call void @_ZdlPvm(ptr noundef %12, i64 noundef 16) #3
  br label %15

15:                                               ; preds = %14, %10
  br label %16

16:                                               ; preds = %15, %1
  ret void
}

; 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

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
define dso_local void @_ZN5sc_dt13sc_string_oldD2Ev(ptr nocapture noundef nonnull readonly align 8 dereferenceable(8) %0) unnamed_addr #1 align 2 {
  %2 = load ptr, ptr %0, align 8, !tbaa !5
  %3 = load i32, ptr %2, align 8, !tbaa !10
  %4 = add nsw i32 %3, -1
  store i32 %4, ptr %2, align 8, !tbaa !10
  %5 = icmp eq i32 %4, 0
  br i1 %5, label %6, label %7

6:                                                ; preds = %1
  tail call void @_ZN5sc_dt13sc_string_repD2Ev(ptr noundef nonnull align 8 dereferenceable(16) %2) #2
  tail call void @_ZdlPvm(ptr noundef nonnull %2, i64 noundef 16) #3
  br label %7

7:                                                ; preds = %6, %1
  ret void
}

; 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

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