; LLVM IR from upupming/algorithm :: codeforces/1243-C.ll (Z7isPrimex)

; 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 i64 @_Z7isPrimex(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  store i64 %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store i64 2, ptr %4, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %25, %1
  %7 = load i64, ptr %4, align 8, !tbaa !5
  %8 = load i64, ptr %4, align 8, !tbaa !5
  %9 = mul nsw i64 %7, %8
  %10 = load i64, ptr %3, align 8, !tbaa !5
  %11 = icmp sle i64 %9, %10
  br i1 %11, label %13, label %12

12:                                               ; preds = %6
  store i32 2, ptr %5, align 4
  br label %28

13:                                               ; preds = %6
  %14 = load i64, ptr %3, align 8, !tbaa !5
  %15 = load i64, ptr %4, align 8, !tbaa !5
  %16 = srem i64 %14, %15
  %17 = icmp eq i64 %16, 0
  br i1 %17, label %18, label %24

18:                                               ; preds = %13
  %19 = load i64, ptr %4, align 8, !tbaa !5
  %20 = call noundef i64 @_Z7isPrimex(i64 noundef %19)
  %21 = icmp eq i64 %20, -1
  br i1 %21, label %22, label %24

22:                                               ; preds = %18
  %23 = load i64, ptr %4, align 8, !tbaa !5
  store i64 %23, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %28

24:                                               ; preds = %18, %13
  br label %25

25:                                               ; preds = %24
  %26 = load i64, ptr %4, align 8, !tbaa !5
  %27 = add nsw i64 %26, 1
  store i64 %27, ptr %4, align 8, !tbaa !5
  br label %6, !llvm.loop !9

28:                                               ; preds = %22, %12
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %29 = load i32, ptr %5, align 4
  switch i32 %29, label %33 [
    i32 2, label %30
    i32 1, label %31
  ]

30:                                               ; preds = %28
  store i64 -1, ptr %2, align 8
  br label %31

31:                                               ; preds = %30, %28
  %32 = load i64, ptr %2, align 8
  ret i64 %32

33:                                               ; preds = %28
  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 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 = !{!"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: mustprogress nofree nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i64 @_Z7isPrimex(i64 noundef %0) local_unnamed_addr #0 {
  %.not13 = icmp slt i64 %0, 4
  br i1 %.not13, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %7
  %.01014 = phi i64 [ %8, %7 ], [ 2, %1 ]
  %2 = urem i64 %0, %.01014
  %3 = icmp eq i64 %2, 0
  br i1 %3, label %4, label %7

4:                                                ; preds = %.lr.ph
  %5 = tail call noundef i64 @_Z7isPrimex(i64 noundef %.01014)
  %6 = icmp eq i64 %5, -1
  br i1 %6, label %._crit_edge, label %7

7:                                                ; preds = %.lr.ph, %4
  %8 = add nuw nsw i64 %.01014, 1
  %9 = mul nuw nsw i64 %8, %8
  %.not = icmp sgt i64 %9, %0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5

._crit_edge:                                      ; preds = %7, %4, %1
  %spec.select = phi i64 [ -1, %1 ], [ %.01014, %4 ], [ -1, %7 ]
  ret i64 %spec.select
}

attributes #0 = { mustprogress nofree 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,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass