; LLVM IR from reyadussalahin/problem-solving :: math/basic/codeforces/F1350A/Solution.ll (Z11getFirstDivi)

; 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 nounwind uwtable
define dso_local noundef i32 @_Z11getFirstDivi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = and i32 %6, 1
  %8 = icmp eq i32 %7, 0
  br i1 %8, label %9, label %10

9:                                                ; preds = %1
  store i32 2, ptr %2, align 4
  br label %36

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

11:                                               ; preds = %29, %10
  %12 = load i32, ptr %4, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = mul nsw i64 %13, %15
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = icmp sle i64 %16, %18
  br i1 %19, label %21, label %20

20:                                               ; preds = %11
  store i32 2, ptr %5, align 4
  br label %32

21:                                               ; preds = %11
  %22 = load i32, ptr %3, align 4, !tbaa !5
  %23 = load i32, ptr %4, align 4, !tbaa !5
  %24 = srem i32 %22, %23
  %25 = icmp eq i32 %24, 0
  br i1 %25, label %26, label %28

26:                                               ; preds = %21
  %27 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %27, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %32

28:                                               ; preds = %21
  br label %29

29:                                               ; preds = %28
  %30 = load i32, ptr %4, align 4, !tbaa !5
  %31 = add nsw i32 %30, 2
  store i32 %31, ptr %4, align 4, !tbaa !5
  br label %11, !llvm.loop !9

32:                                               ; preds = %26, %20
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %33 = load i32, ptr %5, align 4
  switch i32 %33, label %38 [
    i32 2, label %34
    i32 1, label %36
  ]

34:                                               ; preds = %32
  %35 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %35, ptr %2, align 4
  br label %36

36:                                               ; preds = %34, %32, %9
  %37 = load i32, ptr %2, align 4
  ret i32 %37

38:                                               ; preds = %32
  unreachable
}

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

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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++ 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: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i32 @_Z11getFirstDivi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = and i32 %0, 1
  %3 = icmp eq i32 %2, 0
  br i1 %3, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %1
  %4 = sext i32 %0 to i64
  %.not13 = icmp slt i32 %0, 9
  br i1 %.not13, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %8
  %indvars.iv = phi i64 [ %indvars.iv.next, %8 ], [ 3, %.preheader ]
  %5 = trunc nuw nsw i64 %indvars.iv to i32
  %6 = urem i32 %0, %5
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %.loopexit, label %8

8:                                                ; preds = %.lr.ph
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
  %9 = mul nuw nsw i64 %indvars.iv.next, %indvars.iv.next
  %.not = icmp sgt i64 %9, %4
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !5

.loopexit:                                        ; preds = %.lr.ph, %8, %.preheader, %1
  %.1 = phi i32 [ 2, %1 ], [ %0, %.preheader ], [ %5, %.lr.ph ], [ %0, %8 ]
  ret i32 %.1
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(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" }

!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,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass