; LLVM IR from imteekay/algorithms :: competitive-programming/uri/fast_prime_number.ll (Z8is_primei)

; 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 @_Z8is_primei(i32 noundef %0) #0 {
  %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
  store i32 %0, ptr %3, align 4, !tbaa !5
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = icmp eq i32 %7, 2
  br i1 %8, label %9, label %10

9:                                                ; preds = %1
  store i32 1, ptr %2, align 4
  br label %38

10:                                               ; preds = %1
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = srem i32 %11, 2
  %13 = icmp eq i32 %12, 0
  br i1 %13, label %14, label %15

14:                                               ; preds = %10
  store i32 0, ptr %2, align 4
  br label %38

15:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  %16 = load i32, ptr %3, align 4, !tbaa !5
  %17 = call noundef double @_ZSt4sqrtIiEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i32 noundef %16)
  %18 = fptosi double %17 to i32
  store i32 %18, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 3, ptr %5, align 4, !tbaa !5
  br label %19

19:                                               ; preds = %31, %15
  %20 = load i32, ptr %5, align 4, !tbaa !5
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = icmp sle i32 %20, %21
  br i1 %22, label %24, label %23

23:                                               ; preds = %19
  store i32 2, ptr %6, align 4
  br label %34

24:                                               ; preds = %19
  %25 = load i32, ptr %3, align 4, !tbaa !5
  %26 = load i32, ptr %5, align 4, !tbaa !5
  %27 = srem i32 %25, %26
  %28 = icmp eq i32 %27, 0
  br i1 %28, label %29, label %30

29:                                               ; preds = %24
  store i32 0, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %34

30:                                               ; preds = %24
  br label %31

31:                                               ; preds = %30
  %32 = load i32, ptr %5, align 4, !tbaa !5
  %33 = add nsw i32 %32, 2
  store i32 %33, ptr %5, align 4, !tbaa !5
  br label %19, !llvm.loop !9

34:                                               ; preds = %29, %23
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  %35 = load i32, ptr %6, align 4
  switch i32 %35, label %37 [
    i32 2, label %36
  ]

36:                                               ; preds = %34
  store i32 1, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %37

37:                                               ; preds = %36, %34
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  br label %38

38:                                               ; preds = %37, %14, %9
  %39 = load i32, ptr %2, align 4
  ret i32 %39
}

; 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 = 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 nounwind uwtable
define dso_local noundef range(i32 0, 2) i32 @_Z8is_primei(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp eq i32 %0, 2
  br i1 %2, label %._crit_edge, label %3

3:                                                ; preds = %1
  %4 = and i32 %0, 1
  %5 = icmp eq i32 %4, 0
  br i1 %5, label %._crit_edge, label %6

6:                                                ; preds = %3
  %7 = tail call noundef double @_ZSt4sqrtIiEN9__gnu_cxx11__enable_ifIXsr12__is_integerIT_EE7__valueEdE6__typeES2_(i32 noundef %0)
  %8 = fptosi double %7 to i32
  %.not13 = icmp slt i32 %8, 3
  br i1 %.not13, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %6, %.lr.ph
  %.01014 = phi i32 [ %11, %.lr.ph ], [ 3, %6 ]
  %9 = srem i32 %0, %.01014
  %10 = icmp ne i32 %9, 0
  %11 = add nuw nsw i32 %.01014, 2
  %.not = icmp sle i32 %11, %8
  %or.cond.not = select i1 %10, i1 %.not, i1 false
  br i1 %or.cond.not, label %.lr.ph, label %._crit_edge.loopexit, !llvm.loop !5

._crit_edge.loopexit:                             ; preds = %.lr.ph
  %12 = zext i1 %10 to i32
  br label %._crit_edge

._crit_edge:                                      ; preds = %6, %._crit_edge.loopexit, %3, %1
  %.2 = phi i32 [ 1, %1 ], [ 0, %3 ], [ 1, %6 ], [ %12, %._crit_edge.loopexit ]
  ret i32 %.2
}

; 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: GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass