; LLVM IR from abeaumont/competitive-programming :: kattis/listgame.ll (Z8divisorsi)

; 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"

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z8divisorsi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i8, align 1
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %43, %1
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = icmp sgt i32 %8, 1
  br i1 %9, label %10, label %44

10:                                               ; preds = %7
  call void @llvm.lifetime.start.p0(i64 1, ptr %4) #3
  store i8 0, ptr %4, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 2, ptr %5, align 4, !tbaa !5
  br label %11

11:                                               ; preds = %30, %10
  %12 = load i32, ptr %5, align 4, !tbaa !5
  %13 = sitofp i32 %12 to double
  %14 = load i32, ptr %2, align 4, !tbaa !5
  %15 = call noundef double @_ZSt4sqrtIiEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i32 noundef %14)
  %16 = fcmp ole double %13, %15
  br i1 %16, label %18, label %17

17:                                               ; preds = %11
  store i32 4, ptr %6, align 4
  br label %33

18:                                               ; preds = %11
  %19 = load i32, ptr %2, align 4, !tbaa !5
  %20 = load i32, ptr %5, align 4, !tbaa !5
  %21 = srem i32 %19, %20
  %22 = icmp eq i32 %21, 0
  br i1 %22, label %23, label %29

23:                                               ; preds = %18
  %24 = load i32, ptr %3, align 4, !tbaa !5
  %25 = add nsw i32 %24, 1
  store i32 %25, ptr %3, align 4, !tbaa !5
  %26 = load i32, ptr %5, align 4, !tbaa !5
  %27 = load i32, ptr %2, align 4, !tbaa !5
  %28 = sdiv i32 %27, %26
  store i32 %28, ptr %2, align 4, !tbaa !5
  store i8 1, ptr %4, align 1, !tbaa !9
  store i32 4, ptr %6, align 4
  br label %33

29:                                               ; preds = %18
  br label %30

30:                                               ; preds = %29
  %31 = load i32, ptr %5, align 4, !tbaa !5
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %5, align 4, !tbaa !5
  br label %11, !llvm.loop !11

33:                                               ; preds = %23, %17
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  br label %34

34:                                               ; preds = %33
  %35 = load i8, ptr %4, align 1, !tbaa !9, !range !13, !noundef !14
  %36 = trunc i8 %35 to i1
  br i1 %36, label %40, label %37

37:                                               ; preds = %34
  %38 = load i32, ptr %3, align 4, !tbaa !5
  %39 = add nsw i32 %38, 1
  store i32 %39, ptr %3, align 4, !tbaa !5
  store i32 3, ptr %6, align 4
  br label %41

40:                                               ; preds = %34
  store i32 0, ptr %6, align 4
  br label %41

41:                                               ; preds = %40, %37
  call void @llvm.lifetime.end.p0(i64 1, ptr %4) #3
  %42 = load i32, ptr %6, align 4
  switch i32 %42, label %47 [
    i32 0, label %43
    i32 3, label %44
  ]

43:                                               ; preds = %41
  br label %7, !llvm.loop !15

44:                                               ; preds = %41, %7
  %45 = load i32, ptr %3, align 4, !tbaa !5
  %46 = add nsw i32 %45, 1
  store i32 %46, ptr %3, align 4, !tbaa !5
  store i32 1, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  ret i32 %45

47:                                               ; preds = %41
  unreachable
}

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

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef double @_ZSt4sqrtIiEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i32 noundef) #2

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

attributes #0 = { mustprogress 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 = { inlinehint mustprogress 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{i8 0, i8 2}
!14 = !{}
!15 = distinct !{!15, !12}


; 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 nounwind uwtable
define dso_local noundef i32 @_Z8divisorsi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp sgt i32 %0, 1
  br i1 %2, label %.preheader, label %.loopexit

.preheader:                                       ; preds = %1, %14
  %.01526 = phi i32 [ %15, %14 ], [ 0, %1 ]
  %.01625 = phi i32 [ %7, %14 ], [ %0, %1 ]
  %3 = tail call noundef double @_ZSt4sqrtIiEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i32 noundef %.01625)
  %4 = fcmp ult double %3, 2.000000e+00
  br i1 %4, label %.thread, label %.lr.ph

.thread:                                          ; preds = %.preheader, %9
  %5 = add nuw nsw i32 %.01526, 1
  br label %.loopexit

.lr.ph:                                           ; preds = %.preheader, %9
  %.01323 = phi i32 [ %10, %9 ], [ 2, %.preheader ]
  %6 = urem i32 %.01625, %.01323
  %7 = udiv i32 %.01625, %.01323
  %8 = icmp eq i32 %6, 0
  br i1 %8, label %14, label %9

9:                                                ; preds = %.lr.ph
  %10 = add nuw nsw i32 %.01323, 1
  %11 = uitofp nneg i32 %10 to double
  %12 = tail call noundef double @_ZSt4sqrtIiEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i32 noundef %.01625)
  %13 = fcmp ult double %12, %11
  br i1 %13, label %.thread, label %.lr.ph, !llvm.loop !5

14:                                               ; preds = %.lr.ph
  %15 = add nuw nsw i32 %.01526, 1
  %16 = icmp ugt i32 %7, 1
  br i1 %16, label %.preheader, label %.loopexit

.loopexit:                                        ; preds = %14, %1, %.thread
  %.3 = phi i32 [ %5, %.thread ], [ 0, %1 ], [ %15, %14 ]
  ret i32 %.3
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef double @_ZSt4sqrtIiEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i32 noundef) local_unnamed_addr #1

attributes #0 = { mustprogress 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 = { inlinehint mustprogress 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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