; LLVM IR from kmilo17pet/QuarkTS-cpp :: src/util.ll (ZN3qOS4util6strcatEPcPKcm)

; 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"

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZN3qOS4util6strlenEPKcm(ptr noundef, i64 noundef) #1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_ZN3qOS4util6strcatEPcPKcm(ptr noundef %0, ptr noundef %1, i64 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  %8 = alloca i64, align 8
  %9 = alloca i64, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i64 %2, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  %11 = call noundef i64 @_ZN3qOS4util6strlenEPKcm(ptr noundef %10, i64 noundef 512) #3
  store i64 %11, ptr %7, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = load i64, ptr %6, align 8, !tbaa !9
  %14 = call noundef i64 @_ZN3qOS4util6strlenEPKcm(ptr noundef %12, i64 noundef %13) #3
  store i64 %14, ptr %8, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #3
  %15 = load i64, ptr %8, align 8, !tbaa !9
  %16 = load i64, ptr %6, align 8, !tbaa !9
  %17 = icmp eq i64 %15, %16
  br i1 %17, label %18, label %22

18:                                               ; preds = %3
  %19 = load i64, ptr %6, align 8, !tbaa !9
  %20 = load i64, ptr %7, align 8, !tbaa !9
  %21 = add i64 %19, %20
  store i64 %21, ptr %9, align 8, !tbaa !9
  br label %52

22:                                               ; preds = %3
  %23 = load i64, ptr %7, align 8, !tbaa !9
  %24 = load i64, ptr %6, align 8, !tbaa !9
  %25 = load i64, ptr %8, align 8, !tbaa !9
  %26 = sub i64 %24, %25
  %27 = icmp ult i64 %23, %26
  br i1 %27, label %28, label %35

28:                                               ; preds = %22
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = load i64, ptr %8, align 8, !tbaa !9
  %31 = getelementptr inbounds i8, ptr %29, i64 %30
  %32 = load ptr, ptr %5, align 8, !tbaa !5
  %33 = load i64, ptr %7, align 8, !tbaa !9
  %34 = add i64 %33, 1
  call void @llvm.memcpy.p0.p0.i64(ptr align 1 %31, ptr align 1 %32, i64 %34, i1 false)
  br label %48

35:                                               ; preds = %22
  %36 = load ptr, ptr %4, align 8, !tbaa !5
  %37 = load i64, ptr %8, align 8, !tbaa !9
  %38 = getelementptr inbounds i8, ptr %36, i64 %37
  %39 = load ptr, ptr %5, align 8, !tbaa !5
  %40 = load i64, ptr %6, align 8, !tbaa !9
  %41 = sub i64 %40, 1
  call void @llvm.memcpy.p0.p0.i64(ptr align 1 %38, ptr align 1 %39, i64 %41, i1 false)
  %42 = load ptr, ptr %4, align 8, !tbaa !5
  %43 = load i64, ptr %8, align 8, !tbaa !9
  %44 = load i64, ptr %6, align 8, !tbaa !9
  %45 = add i64 %43, %44
  %46 = sub i64 %45, 1
  %47 = getelementptr inbounds i8, ptr %42, i64 %46
  store i8 0, ptr %47, align 1, !tbaa !11
  br label %48

48:                                               ; preds = %35, %28
  %49 = load i64, ptr %8, align 8, !tbaa !9
  %50 = load i64, ptr %7, align 8, !tbaa !9
  %51 = add i64 %49, %50
  store i64 %51, ptr %9, align 8, !tbaa !9
  br label %52

52:                                               ; preds = %48, %18
  %53 = load i64, ptr %9, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  ret i64 %53
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 = !{!7, !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: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZN3qOS4util6strlenEPKcm(ptr noundef, i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_ZN3qOS4util6strcatEPcPKcm(ptr noundef %0, ptr noundef %1, i64 noundef %2) local_unnamed_addr #0 {
  %4 = tail call noundef i64 @_ZN3qOS4util6strlenEPKcm(ptr noundef %1, i64 noundef 512) #2
  %5 = tail call noundef i64 @_ZN3qOS4util6strlenEPKcm(ptr noundef %0, i64 noundef %2) #2
  %6 = icmp eq i64 %5, %2
  br i1 %6, label %7, label %9

7:                                                ; preds = %3
  %8 = add i64 %4, %2
  br label %21

9:                                                ; preds = %3
  %10 = sub i64 %2, %5
  %11 = icmp ult i64 %4, %10
  %12 = getelementptr i8, ptr %0, i64 %5
  br i1 %11, label %13, label %15

13:                                               ; preds = %9
  %14 = add nuw i64 %4, 1
  tail call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 1 dereferenceable(1) %12, ptr noundef nonnull align 1 dereferenceable(1) %1, i64 %14, i1 false)
  br label %19

15:                                               ; preds = %9
  %16 = add i64 %2, -1
  tail call void @llvm.memcpy.p0.p0.i64(ptr align 1 %12, ptr align 1 %1, i64 %16, i1 false)
  %17 = getelementptr i8, ptr %12, i64 %2
  %18 = getelementptr i8, ptr %17, i64 -1
  store i8 0, ptr %18, align 1, !tbaa !5
  br label %19

19:                                               ; preds = %15, %13
  %20 = add i64 %5, %4
  br label %21

21:                                               ; preds = %19, %7
  %.0 = phi i64 [ %8, %7 ], [ %20, %19 ]
  ret i64 %.0
}

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" }
attributes #1 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}


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