; LLVM IR from ryansturmer/thinfat32 :: src (thinfat32)

; 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.struct_tfinfo = type { i8, i8, i32, i32, i16, i32, i8, i32, [512 x i8] }

@tf_info = external dso_local global %struct.struct_tfinfo, align 4

; 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 @tf_get_fat_entry(i32 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @tf_find_free_cluster_from(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %8 = load i32, ptr getelementptr inbounds (%struct.struct_tfinfo, ptr @tf_info, i32 0, i32 3), align 4, !tbaa !9
  %9 = load i8, ptr getelementptr inbounds (%struct.struct_tfinfo, ptr @tf_info, i32 0, i32 1), align 1, !tbaa !12
  %10 = zext i8 %9 to i32
  %11 = udiv i32 %8, %10
  store i32 %11, ptr %6, align 4, !tbaa !5
  %12 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %12, ptr %4, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %25, %1
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = load i32, ptr %6, align 4, !tbaa !5
  %16 = icmp ult i32 %14, %15
  br i1 %16, label %17, label %28

17:                                               ; preds = %13
  %18 = load i32, ptr %4, align 4, !tbaa !5
  %19 = call i32 @tf_get_fat_entry(i32 noundef %18)
  store i32 %19, ptr %5, align 4, !tbaa !5
  %20 = load i32, ptr %5, align 4, !tbaa !5
  %21 = and i32 %20, 268435455
  %22 = icmp eq i32 %21, 0
  br i1 %22, label %23, label %24

23:                                               ; preds = %17
  br label %28

24:                                               ; preds = %17
  br label %25

25:                                               ; preds = %24
  %26 = load i32, ptr %4, align 4, !tbaa !5
  %27 = add i32 %26, 1
  store i32 %27, ptr %4, align 4, !tbaa !5
  br label %13, !llvm.loop !13

28:                                               ; preds = %23, %13
  %29 = load i32, ptr %4, align 4, !tbaa !5
  %30 = load i32, ptr %6, align 4, !tbaa !5
  %31 = icmp eq i32 %29, %30
  br i1 %31, label %32, label %34

32:                                               ; preds = %28
  %33 = call i32 @tf_find_free_cluster()
  store i32 %33, ptr %2, align 4
  store i32 1, ptr %7, align 4
  br label %36

34:                                               ; preds = %28
  %35 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %35, ptr %2, align 4
  store i32 1, ptr %7, align 4
  br label %36

36:                                               ; preds = %34, %32
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %37 = load i32, ptr %2, align 4
  ret i32 %37
}

; Function Attrs: nounwind uwtable
declare dso_local i32 @tf_find_free_cluster() #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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"struct_tfinfo", !7, i64 0, !7, i64 1, !6, i64 4, !6, i64 8, !11, i64 12, !6, i64 16, !7, i64 20, !6, i64 24, !7, i64 28}
!11 = !{!"short", !7, i64 0}
!12 = !{!10, !7, i64 1}
!13 = distinct !{!13, !14}
!14 = !{!"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"

%struct.struct_tfinfo = type { i8, i8, i32, i32, i16, i32, i8, i32, [512 x i8] }

@tf_info = external dso_local local_unnamed_addr global %struct.struct_tfinfo, align 4

; Function Attrs: nounwind uwtable
declare dso_local i32 @tf_get_fat_entry(i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local i32 @tf_find_free_cluster_from(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr getelementptr inbounds (i8, ptr @tf_info, i64 8), align 4, !tbaa !5
  %3 = load i8, ptr getelementptr inbounds (i8, ptr @tf_info, i64 1), align 1, !tbaa !11
  %4 = zext i8 %3 to i32
  %5 = udiv i32 %2, %4
  %6 = icmp ugt i32 %5, %0
  br i1 %6, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %1, %10
  %.01011 = phi i32 [ %11, %10 ], [ %0, %1 ]
  %7 = tail call i32 @tf_get_fat_entry(i32 noundef %.01011)
  %8 = and i32 %7, 268435455
  %9 = icmp eq i32 %8, 0
  br i1 %9, label %._crit_edge, label %10

10:                                               ; preds = %.lr.ph
  %11 = add nuw i32 %.01011, 1
  %12 = icmp ult i32 %11, %5
  br i1 %12, label %.lr.ph, label %._crit_edge, !llvm.loop !12

._crit_edge:                                      ; preds = %10, %.lr.ph, %1
  %.010.lcssa = phi i32 [ %0, %1 ], [ %.01011, %.lr.ph ], [ %11, %10 ]
  %13 = icmp eq i32 %.010.lcssa, %5
  br i1 %13, label %14, label %16

14:                                               ; preds = %._crit_edge
  %15 = tail call i32 @tf_find_free_cluster()
  br label %16

16:                                               ; preds = %._crit_edge, %14
  %.0 = phi i32 [ %15, %14 ], [ %.010.lcssa, %._crit_edge ]
  ret i32 %.0
}

; Function Attrs: nounwind uwtable
declare dso_local i32 @tf_find_free_cluster() 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, !9, i64 8}
!6 = !{!"struct_tfinfo", !7, i64 0, !7, i64 1, !9, i64 4, !9, i64 8, !10, i64 12, !9, i64 16, !7, i64 20, !9, i64 24, !7, i64 28}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!"int", !7, i64 0}
!10 = !{!"short", !7, i64 0}
!11 = !{!6, !7, i64 1}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass