; 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() #1 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  %4 = load i32, ptr getelementptr inbounds (%struct.struct_tfinfo, ptr @tf_info, i32 0, i32 3), align 4, !tbaa !5
  %5 = load i8, ptr getelementptr inbounds (%struct.struct_tfinfo, ptr @tf_info, i32 0, i32 1), align 1, !tbaa !11
  %6 = zext i8 %5 to i32
  %7 = udiv i32 %4, %6
  store i32 %7, ptr %3, align 4, !tbaa !12
  store i32 0, ptr %1, align 4, !tbaa !12
  br label %8

8:                                                ; preds = %20, %0
  %9 = load i32, ptr %1, align 4, !tbaa !12
  %10 = load i32, ptr %3, align 4, !tbaa !12
  %11 = icmp ult i32 %9, %10
  br i1 %11, label %12, label %23

12:                                               ; preds = %8
  %13 = load i32, ptr %1, align 4, !tbaa !12
  %14 = call i32 @tf_get_fat_entry(i32 noundef %13)
  store i32 %14, ptr %2, align 4, !tbaa !12
  %15 = load i32, ptr %2, align 4, !tbaa !12
  %16 = and i32 %15, 268435455
  %17 = icmp eq i32 %16, 0
  br i1 %17, label %18, label %19

18:                                               ; preds = %12
  br label %23

19:                                               ; preds = %12
  br label %20

20:                                               ; preds = %19
  %21 = load i32, ptr %1, align 4, !tbaa !12
  %22 = add i32 %21, 1
  store i32 %22, ptr %1, align 4, !tbaa !12
  br label %8, !llvm.loop !13

23:                                               ; preds = %18, %8
  %24 = load i32, ptr %1, align 4, !tbaa !12
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #2
  ret i32 %24
}

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, !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 = !{!9, !9, i64 0}
!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() local_unnamed_addr #0 {
  %1 = load i32, ptr getelementptr inbounds (i8, ptr @tf_info, i64 8), align 4, !tbaa !5
  %2 = load i8, ptr getelementptr inbounds (i8, ptr @tf_info, i64 1), align 1, !tbaa !11
  %3 = zext i8 %2 to i32
  %4 = udiv i32 %1, %3
  %.not = icmp ult i32 %1, %3
  br i1 %.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %8
  %.06 = phi i32 [ %9, %8 ], [ 0, %0 ]
  %5 = tail call i32 @tf_get_fat_entry(i32 noundef %.06)
  %6 = and i32 %5, 268435455
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %._crit_edge, label %8

8:                                                ; preds = %.lr.ph
  %9 = add nuw i32 %.06, 1
  %10 = icmp ult i32 %9, %4
  br i1 %10, label %.lr.ph, label %._crit_edge, !llvm.loop !12

._crit_edge:                                      ; preds = %8, %.lr.ph, %0
  %.0.lcssa = phi i32 [ 0, %0 ], [ %.06, %.lr.ph ], [ %9, %8 ]
  ret i32 %.0.lcssa
}

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