; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 06. Sorting/Maximum_subarray_sum.ll (Z13countDivisorsx)

; 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: 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: inlinehint mustprogress nounwind uwtable
declare dso_local noundef double @_ZSt4sqrtIxEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i64 noundef) #1

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_Z13countDivisorsx(i64 noundef %0) #2 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  store i64 %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  store i64 0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  store i64 1, ptr %4, align 8, !tbaa !5
  br label %5

5:                                                ; preds = %31, %1
  %6 = load i64, ptr %4, align 8, !tbaa !5
  %7 = sitofp i64 %6 to double
  %8 = load i64, ptr %2, align 8, !tbaa !5
  %9 = call noundef double @_ZSt4sqrtIxEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i64 noundef %8)
  %10 = fcmp ole double %7, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %5
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  br label %34

12:                                               ; preds = %5
  %13 = load i64, ptr %2, align 8, !tbaa !5
  %14 = load i64, ptr %4, align 8, !tbaa !5
  %15 = srem i64 %13, %14
  %16 = icmp eq i64 %15, 0
  br i1 %16, label %17, label %30

17:                                               ; preds = %12
  %18 = load i64, ptr %2, align 8, !tbaa !5
  %19 = load i64, ptr %4, align 8, !tbaa !5
  %20 = sdiv i64 %18, %19
  %21 = load i64, ptr %4, align 8, !tbaa !5
  %22 = icmp eq i64 %20, %21
  br i1 %22, label %23, label %26

23:                                               ; preds = %17
  %24 = load i64, ptr %3, align 8, !tbaa !5
  %25 = add nsw i64 %24, 1
  store i64 %25, ptr %3, align 8, !tbaa !5
  br label %29

26:                                               ; preds = %17
  %27 = load i64, ptr %3, align 8, !tbaa !5
  %28 = add nsw i64 %27, 2
  store i64 %28, ptr %3, align 8, !tbaa !5
  br label %29

29:                                               ; preds = %26, %23
  br label %30

30:                                               ; preds = %29, %12
  br label %31

31:                                               ; preds = %30
  %32 = load i64, ptr %4, align 8, !tbaa !5
  %33 = add nsw i64 %32, 1
  store i64 %33, ptr %4, align 8, !tbaa !5
  br label %5, !llvm.loop !9

34:                                               ; preds = %11
  %35 = load i64, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret i64 %35
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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" }
attributes #2 = { 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 #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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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"

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef double @_ZSt4sqrtIxEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z13countDivisorsx(i64 noundef %0) local_unnamed_addr #1 {
  %2 = tail call noundef double @_ZSt4sqrtIxEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i64 noundef %0)
  %3 = fcmp ult double %2, 1.000000e+00
  br i1 %3, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %13, %1
  %.011.lcssa = phi i64 [ 0, %1 ], [ %.1, %13 ]
  ret i64 %.011.lcssa

.lr.ph:                                           ; preds = %1, %13
  %.013 = phi i64 [ %14, %13 ], [ 1, %1 ]
  %.01112 = phi i64 [ %.1, %13 ], [ 0, %1 ]
  %4 = srem i64 %0, %.013
  %5 = sdiv i64 %0, %.013
  %6 = icmp eq i64 %4, 0
  br i1 %6, label %7, label %13

7:                                                ; preds = %.lr.ph
  %8 = icmp eq i64 %5, %.013
  br i1 %8, label %9, label %11

9:                                                ; preds = %7
  %10 = add nsw i64 %.01112, 1
  br label %13

11:                                               ; preds = %7
  %12 = add nsw i64 %.01112, 2
  br label %13

13:                                               ; preds = %.lr.ph, %11, %9
  %.1 = phi i64 [ %10, %9 ], [ %12, %11 ], [ %.01112, %.lr.ph ]
  %14 = add nuw nsw i64 %.013, 1
  %15 = uitofp nneg i64 %14 to double
  %16 = tail call noundef double @_ZSt4sqrtIxEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i64 noundef %0)
  %17 = fcmp ult double %16, %15
  br i1 %17, label %._crit_edge, label %.lr.ph, !llvm.loop !5
}

attributes #0 = { 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 #1 = { 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: DivRemPairsPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass