; LLVM IR from russellsayshi/CeeBeeServer :: main (stringcat)

; 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: nounwind willreturn memory(read)
declare i64 @strlen(ptr noundef) #1

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

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

; Function Attrs: nounwind uwtable
define dso_local ptr @stringcat(ptr noundef %0, ptr noundef %1) #3 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #5
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = call i64 @strlen(ptr noundef %10) #6
  store i64 %11, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #5
  %12 = load ptr, ptr %5, align 8, !tbaa !5
  %13 = call i64 @strlen(ptr noundef %12) #6
  store i64 %13, ptr %7, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #5
  %14 = load i64, ptr %6, align 8, !tbaa !9
  %15 = load i64, ptr %7, align 8, !tbaa !9
  %16 = add i64 %14, %15
  %17 = add i64 %16, 1
  %18 = call noalias ptr @malloc(i64 noundef %17) #7
  store ptr %18, ptr %8, align 8, !tbaa !5
  %19 = load ptr, ptr %8, align 8, !tbaa !5
  %20 = icmp eq ptr %19, null
  br i1 %20, label %21, label %22

21:                                               ; preds = %2
  store ptr null, ptr %3, align 8
  store i32 1, ptr %9, align 4
  br label %39

22:                                               ; preds = %2
  %23 = load ptr, ptr %8, align 8, !tbaa !5
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = load i64, ptr %6, align 8, !tbaa !9
  %26 = call ptr @strncpy(ptr noundef %23, ptr noundef %24, i64 noundef %25) #5
  %27 = load ptr, ptr %8, align 8, !tbaa !5
  %28 = load i64, ptr %6, align 8, !tbaa !9
  %29 = getelementptr inbounds i8, ptr %27, i64 %28
  %30 = load ptr, ptr %5, align 8, !tbaa !5
  %31 = load i64, ptr %7, align 8, !tbaa !9
  %32 = call ptr @strncpy(ptr noundef %29, ptr noundef %30, i64 noundef %31) #5
  %33 = load ptr, ptr %8, align 8, !tbaa !5
  %34 = load i64, ptr %6, align 8, !tbaa !9
  %35 = load i64, ptr %7, align 8, !tbaa !9
  %36 = add i64 %34, %35
  %37 = getelementptr inbounds i8, ptr %33, i64 %36
  store i8 0, ptr %37, align 1, !tbaa !11
  %38 = load ptr, ptr %8, align 8, !tbaa !5
  store ptr %38, ptr %3, align 8
  store i32 1, ptr %9, align 4
  br label %39

39:                                               ; preds = %22, %21
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #5
  %40 = load ptr, ptr %3, align 8
  ret ptr %40
}

; Function Attrs: nounwind
declare ptr @strncpy(ptr noundef, ptr noundef, i64 noundef) #4

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind willreturn memory(read) "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 allocsize(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 #3 = { 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 #4 = { 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 #5 = { nounwind }
attributes #6 = { nounwind willreturn memory(read) }
attributes #7 = { nounwind allocsize(0) }

!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/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 nofree nounwind willreturn memory(argmem: read)
declare i64 @strlen(ptr nocapture noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

; Function Attrs: mustprogress nofree nounwind willreturn uwtable
define dso_local noundef ptr @stringcat(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1) local_unnamed_addr #2 {
  %3 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %0) #4
  %4 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %1) #4
  %5 = add i64 %4, %3
  %6 = add i64 %5, 1
  %7 = tail call noalias ptr @malloc(i64 noundef %6) #5
  %8 = icmp eq ptr %7, null
  br i1 %8, label %14, label %9

9:                                                ; preds = %2
  %10 = tail call ptr @strncpy(ptr noundef nonnull %7, ptr noundef %0, i64 noundef %3) #6
  %11 = getelementptr inbounds i8, ptr %7, i64 %3
  %12 = tail call ptr @strncpy(ptr noundef nonnull %11, ptr noundef %1, i64 noundef %4) #6
  %13 = getelementptr inbounds i8, ptr %7, i64 %5
  store i8 0, ptr %13, align 1, !tbaa !5
  br label %14

14:                                               ; preds = %2, %9
  ret ptr %7
}

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: readwrite)
declare ptr @strncpy(ptr noalias noundef returned writeonly, ptr noalias nocapture noundef readonly, i64 noundef) local_unnamed_addr #3

attributes #0 = { mustprogress nofree nounwind willreturn memory(argmem: read) "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 nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { mustprogress nofree nounwind willreturn 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 #3 = { mustprogress nofree nounwind willreturn memory(argmem: readwrite) "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 #4 = { nounwind willreturn memory(read) }
attributes #5 = { nounwind allocsize(0) }
attributes #6 = { 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/C++ TBAA"}


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