; LLVM IR from ybubnov/libhuffman :: src (io)

; 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.__huf_read_writer = type { ptr, ptr, ptr }

; Function Attrs: nounwind uwtable
declare dso_local i32 @fdwrite(ptr noundef, ptr noundef, i64 noundef) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind uwtable
declare dso_local i32 @fdread(ptr noundef, ptr noundef, ptr noundef) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @huf_fdopen(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 0, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  br label %10

10:                                               ; preds = %2
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = icmp eq ptr %11, null
  br i1 %12, label %13, label %14

13:                                               ; preds = %10
  store i32 2, ptr %6, align 4, !tbaa !9
  br label %36

14:                                               ; preds = %10
  br label %15

15:                                               ; preds = %14
  br label %16

16:                                               ; preds = %15
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = call i32 @huf_malloc(ptr noundef %17, i64 noundef 24, i64 noundef 1)
  store i32 %18, ptr %7, align 4, !tbaa !9
  %19 = load i32, ptr %7, align 4, !tbaa !9
  %20 = icmp ne i32 %19, 0
  br i1 %20, label %21, label %26

21:                                               ; preds = %16
  br label %22

22:                                               ; preds = %21
  %23 = load i32, ptr %7, align 4, !tbaa !9
  store i32 %23, ptr %6, align 4, !tbaa !9
  br label %36

24:                                               ; No predecessors!
  br label %25

25:                                               ; preds = %24
  br label %26

26:                                               ; preds = %25, %16
  %27 = load ptr, ptr %4, align 8, !tbaa !5
  %28 = load ptr, ptr %27, align 8, !tbaa !5
  store ptr %28, ptr %8, align 8, !tbaa !5
  %29 = load ptr, ptr %8, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.__huf_read_writer, ptr %29, i32 0, i32 0
  store ptr %5, ptr %30, align 8, !tbaa !11
  %31 = load ptr, ptr %8, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.__huf_read_writer, ptr %31, i32 0, i32 2
  store ptr @fdread, ptr %32, align 8, !tbaa !13
  %33 = load ptr, ptr %8, align 8, !tbaa !5
  %34 = getelementptr inbounds %struct.__huf_read_writer, ptr %33, i32 0, i32 1
  store ptr @fdwrite, ptr %34, align 8, !tbaa !14
  br label %35

35:                                               ; preds = %26
  br label %36

36:                                               ; preds = %35, %22, %13
  %37 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %37, ptr %3, align 4
  store i32 1, ptr %9, align 4
  br label %40

38:                                               ; No predecessors!
  br label %39

39:                                               ; preds = %38
  store i32 0, ptr %9, align 4
  br label %40

40:                                               ; preds = %39, %36
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  %41 = load i32, ptr %9, align 4
  switch i32 %41, label %44 [
    i32 0, label %42
    i32 1, label %42
  ]

42:                                               ; preds = %40, %40
  %43 = load i32, ptr %3, align 4
  ret i32 %43

44:                                               ; preds = %40
  unreachable
}

declare i32 @huf_malloc(ptr noundef, i64 noundef, i64 noundef) #2

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" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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 }

!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 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"__huf_read_writer", !6, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!12, !6, i64 16}
!14 = !{!12, !6, i64 8}


; 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 @fdwrite(ptr noundef, ptr noundef, i64 noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @fdread(ptr noundef, ptr noundef, ptr noundef) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @huf_fdopen(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = alloca i32, align 4
  %4 = icmp eq ptr %0, null
  br i1 %4, label %11, label %5

5:                                                ; preds = %2
  %6 = tail call i32 @huf_malloc(ptr noundef nonnull %0, i64 noundef 24, i64 noundef 1) #2
  %.not = icmp eq i32 %6, 0
  br i1 %.not, label %7, label %11

7:                                                ; preds = %5
  %8 = load ptr, ptr %0, align 8, !tbaa !5
  store ptr %3, ptr %8, align 8, !tbaa !9
  %9 = getelementptr inbounds i8, ptr %8, i64 16
  store ptr @fdread, ptr %9, align 8, !tbaa !11
  %10 = getelementptr inbounds i8, ptr %8, i64 8
  store ptr @fdwrite, ptr %10, align 8, !tbaa !12
  br label %11

11:                                               ; preds = %5, %2, %7
  %.0 = phi i32 [ 0, %7 ], [ 2, %2 ], [ %6, %5 ]
  ret i32 %.0
}

declare i32 @huf_malloc(ptr noundef, i64 noundef, i64 noundef) local_unnamed_addr #1

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" }
attributes #1 = { "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 0}
!10 = !{!"__huf_read_writer", !6, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!10, !6, i64 16}
!12 = !{!10, !6, i64 8}


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