; LLVM IR from lzyrapx/Competitive-Programming :: 51Nod/1136（欧拉函数）.ll (Z5euleri)

; 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 @_Z5euleri(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 1, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 2, ptr %4, align 4, !tbaa !5
  br label %5

5:                                                ; preds = %38, %1
  %6 = load i32, ptr %4, align 4, !tbaa !5
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = mul nsw i32 %6, %7
  %9 = load i32, ptr %2, align 4, !tbaa !5
  %10 = icmp sle i32 %8, %9
  br i1 %10, label %11, label %41

11:                                               ; preds = %5
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = load i32, ptr %4, align 4, !tbaa !5
  %14 = srem i32 %12, %13
  %15 = icmp eq i32 %14, 0
  br i1 %15, label %16, label %37

16:                                               ; preds = %11
  %17 = load i32, ptr %4, align 4, !tbaa !5
  %18 = load i32, ptr %2, align 4, !tbaa !5
  %19 = sdiv i32 %18, %17
  store i32 %19, ptr %2, align 4, !tbaa !5
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = sub nsw i32 %20, 1
  %22 = load i32, ptr %3, align 4, !tbaa !5
  %23 = mul nsw i32 %22, %21
  store i32 %23, ptr %3, align 4, !tbaa !5
  br label %24

24:                                               ; preds = %29, %16
  %25 = load i32, ptr %2, align 4, !tbaa !5
  %26 = load i32, ptr %4, align 4, !tbaa !5
  %27 = srem i32 %25, %26
  %28 = icmp eq i32 %27, 0
  br i1 %28, label %29, label %36

29:                                               ; preds = %24
  %30 = load i32, ptr %4, align 4, !tbaa !5
  %31 = load i32, ptr %2, align 4, !tbaa !5
  %32 = sdiv i32 %31, %30
  store i32 %32, ptr %2, align 4, !tbaa !5
  %33 = load i32, ptr %4, align 4, !tbaa !5
  %34 = load i32, ptr %3, align 4, !tbaa !5
  %35 = mul nsw i32 %34, %33
  store i32 %35, ptr %3, align 4, !tbaa !5
  br label %24, !llvm.loop !9

36:                                               ; preds = %24
  br label %37

37:                                               ; preds = %36, %11
  br label %38

38:                                               ; preds = %37
  %39 = load i32, ptr %4, align 4, !tbaa !5
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %4, align 4, !tbaa !5
  br label %5, !llvm.loop !11

41:                                               ; preds = %5
  %42 = load i32, ptr %2, align 4, !tbaa !5
  %43 = icmp sgt i32 %42, 1
  br i1 %43, label %44, label %49

44:                                               ; preds = %41
  %45 = load i32, ptr %2, align 4, !tbaa !5
  %46 = sub nsw i32 %45, 1
  %47 = load i32, ptr %3, align 4, !tbaa !5
  %48 = mul nsw i32 %47, %46
  store i32 %48, ptr %3, align 4, !tbaa !5
  br label %49

49:                                               ; preds = %44, %41
  %50 = load i32, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %50
}

; 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"}
!11 = distinct !{!11, !10}


; 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 @_Z5euleri(i32 noundef %0) local_unnamed_addr #0 {
  %.not28 = icmp slt i32 %0, 4
  br i1 %.not28, label %._crit_edge, label %.lr.ph33

.lr.ph33:                                         ; preds = %1, %.loopexit
  %.031 = phi i32 [ %12, %.loopexit ], [ 2, %1 ]
  %.02030 = phi i32 [ %.2, %.loopexit ], [ 1, %1 ]
  %.02129 = phi i32 [ %.223, %.loopexit ], [ %0, %1 ]
  %2 = srem i32 %.02129, %.031
  %.12224 = sdiv i32 %.02129, %.031
  %3 = icmp eq i32 %2, 0
  br i1 %3, label %4, label %.loopexit

4:                                                ; preds = %.lr.ph33
  %5 = add nsw i32 %.031, -1
  %6 = mul nsw i32 %5, %.02030
  %7 = srem i32 %.12224, %.031
  %8 = icmp eq i32 %7, 0
  br i1 %8, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %4, %.lr.ph
  %.12226 = phi i32 [ %.122, %.lr.ph ], [ %.12224, %4 ]
  %.125 = phi i32 [ %9, %.lr.ph ], [ %6, %4 ]
  %9 = mul nsw i32 %.125, %.031
  %.122 = sdiv i32 %.12226, %.031
  %10 = srem i32 %.122, %.031
  %11 = icmp eq i32 %10, 0
  br i1 %11, label %.lr.ph, label %.loopexit, !llvm.loop !5

.loopexit:                                        ; preds = %.lr.ph, %4, %.lr.ph33
  %.223 = phi i32 [ %.02129, %.lr.ph33 ], [ %.12224, %4 ], [ %.122, %.lr.ph ]
  %.2 = phi i32 [ %.02030, %.lr.ph33 ], [ %6, %4 ], [ %9, %.lr.ph ]
  %12 = add nuw nsw i32 %.031, 1
  %13 = mul nuw nsw i32 %12, %12
  %.not = icmp sgt i32 %13, %.223
  br i1 %.not, label %._crit_edge, label %.lr.ph33, !llvm.loop !7

._crit_edge:                                      ; preds = %.loopexit, %1
  %.021.lcssa = phi i32 [ %0, %1 ], [ %.223, %.loopexit ]
  %.020.lcssa = phi i32 [ 1, %1 ], [ %.2, %.loopexit ]
  %14 = icmp sgt i32 %.021.lcssa, 1
  %15 = add nsw i32 %.021.lcssa, -1
  %16 = select i1 %14, i32 %15, i32 1
  %.3 = mul nsw i32 %16, %.020.lcssa
  ret i32 %.3
}

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"}
!7 = distinct !{!7, !6}


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