; 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_memstream = type { ptr, i64, i64, i64 }

; 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: 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: nounwind uwtable
define dso_local i32 @memread(ptr noundef %0, ptr noundef %1, ptr noundef %2) #2 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, 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 ptr %2, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %10, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %11 = load ptr, ptr %6, align 8, !tbaa !5
  %12 = load i64, ptr %11, align 8, !tbaa !9
  store i64 %12, ptr %8, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #3
  %13 = load ptr, ptr %7, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.__huf_memstream, ptr %13, i32 0, i32 2
  %15 = load i64, ptr %14, align 8, !tbaa !11
  %16 = load ptr, ptr %7, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.__huf_memstream, ptr %16, i32 0, i32 1
  %18 = load i64, ptr %17, align 8, !tbaa !13
  %19 = sub i64 %15, %18
  store i64 %19, ptr %9, align 8, !tbaa !9
  %20 = load i64, ptr %8, align 8, !tbaa !9
  %21 = load i64, ptr %9, align 8, !tbaa !9
  %22 = icmp ugt i64 %20, %21
  br i1 %22, label %23, label %25

23:                                               ; preds = %3
  %24 = load i64, ptr %9, align 8, !tbaa !9
  store i64 %24, ptr %8, align 8, !tbaa !9
  br label %25

25:                                               ; preds = %23, %3
  %26 = load i64, ptr %8, align 8, !tbaa !9
  %27 = load ptr, ptr %6, align 8, !tbaa !5
  store i64 %26, ptr %27, align 8, !tbaa !9
  %28 = load i64, ptr %8, align 8, !tbaa !9
  %29 = icmp ugt i64 %28, 0
  br i1 %29, label %30, label %46

30:                                               ; preds = %25
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = load ptr, ptr %7, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.__huf_memstream, ptr %32, i32 0, i32 0
  %34 = load ptr, ptr %33, align 8, !tbaa !14
  %35 = load ptr, ptr %34, align 8, !tbaa !5
  %36 = load ptr, ptr %7, align 8, !tbaa !5
  %37 = getelementptr inbounds %struct.__huf_memstream, ptr %36, i32 0, i32 1
  %38 = load i64, ptr %37, align 8, !tbaa !13
  %39 = getelementptr inbounds i8, ptr %35, i64 %38
  %40 = load i64, ptr %8, align 8, !tbaa !9
  call void @llvm.memcpy.p0.p0.i64(ptr align 1 %31, ptr align 1 %39, i64 %40, i1 false)
  %41 = load i64, ptr %8, align 8, !tbaa !9
  %42 = load ptr, ptr %7, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.__huf_memstream, ptr %42, i32 0, i32 1
  %44 = load i64, ptr %43, align 8, !tbaa !13
  %45 = add i64 %44, %41
  store i64 %45, ptr %43, align 8, !tbaa !13
  br label %46

46:                                               ; preds = %30, %25
  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 i32 0
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #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 = !{!"long", !7, i64 0}
!11 = !{!12, !10, i64 16}
!12 = !{!"__huf_memstream", !6, i64 0, !10, i64 8, !10, i64 16, !10, i64 24}
!13 = !{!12, !10, i64 8}
!14 = !{!12, !6, 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 nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #0

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(readwrite, inaccessiblemem: none) uwtable
define dso_local noundef i32 @memread(ptr nocapture noundef %0, ptr nocapture noundef writeonly %1, ptr nocapture noundef %2) local_unnamed_addr #1 {
  %4 = load i64, ptr %2, align 8, !tbaa !5
  %5 = getelementptr inbounds i8, ptr %0, i64 16
  %6 = load i64, ptr %5, align 8, !tbaa !9
  %7 = getelementptr inbounds i8, ptr %0, i64 8
  %8 = load i64, ptr %7, align 8, !tbaa !12
  %9 = sub i64 %6, %8
  %spec.select = tail call i64 @llvm.umin.i64(i64 %4, i64 %9)
  store i64 %spec.select, ptr %2, align 8, !tbaa !5
  %.not = icmp eq i64 %spec.select, 0
  br i1 %.not, label %17, label %10

10:                                               ; preds = %3
  %11 = load ptr, ptr %0, align 8, !tbaa !13
  %12 = load ptr, ptr %11, align 8, !tbaa !14
  %13 = load i64, ptr %7, align 8, !tbaa !12
  %14 = getelementptr inbounds i8, ptr %12, i64 %13
  tail call void @llvm.memcpy.p0.p0.i64(ptr align 1 %1, ptr align 1 %14, i64 %spec.select, i1 false)
  %15 = load i64, ptr %7, align 8, !tbaa !12
  %16 = add i64 %15, %spec.select
  store i64 %16, ptr %7, align 8, !tbaa !12
  br label %17

17:                                               ; preds = %10, %3
  ret i32 0
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.umin.i64(i64, i64) #2

attributes #0 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress nofree norecurse nosync nounwind willreturn memory(readwrite, inaccessiblemem: none) 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 nosync nounwind speculatable willreturn memory(none) }

!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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 16}
!10 = !{!"__huf_memstream", !11, i64 0, !6, i64 8, !6, i64 16, !6, i64 24}
!11 = !{!"any pointer", !7, i64 0}
!12 = !{!10, !6, i64 8}
!13 = !{!10, !11, i64 0}
!14 = !{!11, !11, i64 0}


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