; LLVM IR from chkn/logdb :: src (logdb_buffer)

; 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.logdb_buffer_t = type { ptr, i32, ptr, ptr, ptr, i32 }

; 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: nounwind uwtable
declare dso_local i32 @logdb_buffer_length(ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local ptr @logdb_buffer_append(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = icmp ne ptr %8, null
  br i1 %9, label %12, label %10

10:                                               ; preds = %2
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %11, ptr %3, align 8
  br label %43

12:                                               ; preds = %2
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = call i32 @logdb_buffer_length(ptr noundef %13)
  %15 = sub i32 -1, %14
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = call i32 @logdb_buffer_length(ptr noundef %16)
  %18 = icmp ult i32 %15, %17
  br i1 %18, label %19, label %20

19:                                               ; preds = %12
  store ptr null, ptr %3, align 8
  br label %43

20:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %21 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %21, ptr %6, align 8, !tbaa !5
  br label %22

22:                                               ; preds = %35, %20
  %23 = load ptr, ptr %6, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.logdb_buffer_t, ptr %23, i32 0, i32 4
  %25 = load ptr, ptr %24, align 8, !tbaa !9
  %26 = icmp ne ptr %25, null
  br i1 %26, label %27, label %36

27:                                               ; preds = %22
  %28 = load ptr, ptr %6, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.logdb_buffer_t, ptr %28, i32 0, i32 4
  %30 = load ptr, ptr %29, align 8, !tbaa !9
  store ptr %30, ptr %6, align 8, !tbaa !5
  %31 = load ptr, ptr %6, align 8, !tbaa !5
  %32 = load ptr, ptr %5, align 8, !tbaa !5
  %33 = icmp eq ptr %31, %32
  br i1 %33, label %34, label %35

34:                                               ; preds = %27
  store ptr null, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %42

35:                                               ; preds = %27
  br label %22, !llvm.loop !12

36:                                               ; preds = %22
  %37 = load ptr, ptr %5, align 8, !tbaa !5
  %38 = call ptr @logdb_buffer_copy(ptr noundef %37)
  %39 = load ptr, ptr %6, align 8, !tbaa !5
  %40 = getelementptr inbounds %struct.logdb_buffer_t, ptr %39, i32 0, i32 4
  store ptr %38, ptr %40, align 8, !tbaa !9
  %41 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %41, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %42

42:                                               ; preds = %36, %34
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %43

43:                                               ; preds = %42, %19, %10
  %44 = load ptr, ptr %3, align 8
  ret ptr %44
}

; Function Attrs: nounwind uwtable
declare hidden ptr @logdb_buffer_copy(ptr noundef) #1

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 }

!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, !6, i64 32}
!10 = !{!"logdb_buffer_t", !6, i64 0, !11, i64 8, !6, i64 16, !6, i64 24, !6, i64 32, !7, i64 40}
!11 = !{!"int", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


; 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: nounwind uwtable
declare dso_local i32 @logdb_buffer_length(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef ptr @logdb_buffer_append(ptr noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %.loopexit, label %3

3:                                                ; preds = %2
  %4 = tail call i32 @logdb_buffer_length(ptr noundef nonnull %0)
  %5 = xor i32 %4, -1
  %6 = tail call i32 @logdb_buffer_length(ptr noundef %1)
  %7 = icmp ugt i32 %6, %5
  br i1 %7, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %3, %10
  %.0 = phi ptr [ %9, %10 ], [ %0, %3 ]
  %8 = getelementptr inbounds i8, ptr %.0, i64 32
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %.not16 = icmp eq ptr %9, null
  br i1 %.not16, label %12, label %10

10:                                               ; preds = %.preheader
  %11 = icmp eq ptr %9, %1
  br i1 %11, label %.loopexit, label %.preheader, !llvm.loop !11

12:                                               ; preds = %.preheader
  %13 = getelementptr inbounds i8, ptr %.0, i64 32
  %14 = tail call ptr @logdb_buffer_copy(ptr noundef %1)
  store ptr %14, ptr %13, align 8, !tbaa !5
  br label %.loopexit

.loopexit:                                        ; preds = %10, %12, %3, %2
  %.1 = phi ptr [ %1, %2 ], [ null, %3 ], [ %0, %12 ], [ null, %10 ]
  ret ptr %.1
}

; Function Attrs: nounwind uwtable
declare hidden ptr @logdb_buffer_copy(ptr noundef) local_unnamed_addr #0

attributes #0 = { 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" }

!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 32}
!6 = !{!"logdb_buffer_t", !7, i64 0, !10, i64 8, !7, i64 16, !7, i64 24, !7, i64 32, !8, i64 40}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass