; LLVM IR from wrnlb666/yet-another-string-library-in-c :: yasli (str_appended_cstr)

; 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"

%struct.string_t = type { i64, i64, [1 x i8] }

; 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: inlinehint nounwind uwtable
declare hidden zeroext i1 @str_resize(ptr noundef, i64 noundef) #1

; Function Attrs: nounwind willreturn memory(read)
declare i64 @strlen(ptr noundef) #2

; Function Attrs: nounwind
declare ptr @strcpy(ptr noundef, ptr noundef) #3

; Function Attrs: nounwind uwtable
define dso_local ptr @str_appended_cstr(ptr noundef %0, ptr noundef %1) #4 {
  %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 = getelementptr inbounds %struct.string_t, ptr %10, i32 0, i32 0
  %12 = load i64, ptr %11, align 8, !tbaa !9
  store i64 %12, ptr %6, align 8, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #5
  %13 = load ptr, ptr %5, align 8, !tbaa !5
  %14 = call i64 @strlen(ptr noundef %13) #6
  store i64 %14, ptr %7, align 8, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #5
  store ptr null, ptr %8, align 8, !tbaa !5
  %15 = load i64, ptr %6, align 8, !tbaa !12
  %16 = load i64, ptr %7, align 8, !tbaa !12
  %17 = add i64 %15, %16
  %18 = call zeroext i1 @str_resize(ptr noundef %8, i64 noundef %17)
  br i1 %18, label %19, label %41

19:                                               ; preds = %2
  %20 = load ptr, ptr %8, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.string_t, ptr %20, i32 0, i32 2
  %22 = getelementptr inbounds [1 x i8], ptr %21, i64 0, i64 0
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.string_t, ptr %23, i32 0, i32 2
  %25 = getelementptr inbounds [1 x i8], ptr %24, i64 0, i64 0
  %26 = call ptr @strcpy(ptr noundef %22, ptr noundef %25) #5
  %27 = load ptr, ptr %8, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.string_t, ptr %27, i32 0, i32 2
  %29 = getelementptr inbounds [1 x i8], ptr %28, i64 0, i64 0
  %30 = load i64, ptr %6, align 8, !tbaa !12
  %31 = getelementptr inbounds i8, ptr %29, i64 %30
  %32 = load ptr, ptr %5, align 8, !tbaa !5
  %33 = call ptr @strcpy(ptr noundef %31, ptr noundef %32) #5
  %34 = load ptr, ptr %8, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.string_t, ptr %34, i32 0, i32 2
  %36 = load ptr, ptr %8, align 8, !tbaa !5
  %37 = getelementptr inbounds %struct.string_t, ptr %36, i32 0, i32 0
  %38 = load i64, ptr %37, align 8, !tbaa !9
  %39 = getelementptr inbounds [1 x i8], ptr %35, i64 0, i64 %38
  store i8 0, ptr %39, align 1, !tbaa !13
  %40 = load ptr, ptr %8, align 8, !tbaa !5
  store ptr %40, ptr %3, align 8
  store i32 1, ptr %9, align 4
  br label %42

41:                                               ; preds = %2
  store ptr null, ptr %3, align 8
  store i32 1, ptr %9, align 4
  br label %42

42:                                               ; preds = %41, %19
  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
  %43 = load ptr, ptr %3, align 8
  ret ptr %43
}

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

!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, !11, i64 0}
!10 = !{!"string_t", !11, i64 0, !11, i64 8, !7, i64 16}
!11 = !{!"long", !7, i64 0}
!12 = !{!11, !11, i64 0}
!13 = !{!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 nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

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

; Function Attrs: inlinehint nounwind uwtable
declare hidden zeroext i1 @str_resize(ptr noundef, i64 noundef) local_unnamed_addr #1

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare i64 @strlen(ptr nocapture noundef) local_unnamed_addr #2

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

; Function Attrs: nounwind uwtable
define dso_local ptr @str_appended_cstr(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1) local_unnamed_addr #4 {
  %3 = alloca ptr, align 8
  %4 = load i64, ptr %0, align 8, !tbaa !5
  %5 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %1) #5
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #6
  store ptr null, ptr %3, align 8, !tbaa !10
  %6 = add i64 %5, %4
  %7 = call zeroext i1 @str_resize(ptr noundef nonnull %3, i64 noundef %6)
  br i1 %7, label %8, label %20

8:                                                ; preds = %2
  %9 = load ptr, ptr %3, align 8, !tbaa !10
  %10 = getelementptr inbounds i8, ptr %9, i64 16
  %11 = getelementptr inbounds i8, ptr %0, i64 16
  %12 = call ptr @strcpy(ptr noundef nonnull dereferenceable(1) %10, ptr noundef nonnull dereferenceable(1) %11) #6
  %13 = getelementptr inbounds i8, ptr %10, i64 %4
  %14 = call ptr @strcpy(ptr noundef nonnull dereferenceable(1) %13, ptr noundef nonnull dereferenceable(1) %1) #6
  %15 = load ptr, ptr %3, align 8, !tbaa !10
  %16 = getelementptr inbounds i8, ptr %15, i64 16
  %17 = load i64, ptr %15, align 8, !tbaa !5
  %18 = getelementptr inbounds [1 x i8], ptr %16, i64 0, i64 %17
  store i8 0, ptr %18, align 1, !tbaa !12
  %19 = load ptr, ptr %3, align 8, !tbaa !10
  br label %20

20:                                               ; preds = %2, %8
  %.0 = phi ptr [ %19, %8 ], [ null, %2 ]
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #6
  ret ptr %.0
}

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { inlinehint 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 = { 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 #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 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 #5 = { nounwind willreturn memory(read) }
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, !7, i64 0}
!6 = !{!"string_t", !7, i64 0, !7, i64 8, !8, i64 16}
!7 = !{!"long", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!11, !11, i64 0}
!11 = !{!"any pointer", !8, i64 0}
!12 = !{!8, !8, i64 0}


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