; LLVM IR from upupming/algorithm :: acwing/算法基础课/第四讲 数学知识/欧拉函数/873. 欧拉函数.ll (Z3phii)

; 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 @_Z3phii(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
  %5 = load i32, ptr %2, align 4, !tbaa !5
  store i32 %5, 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 %6

6:                                                ; preds = %36, %1
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = sdiv i32 %8, %9
  %11 = icmp sle i32 %7, %10
  br i1 %11, label %13, label %12

12:                                               ; preds = %6
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %39

13:                                               ; preds = %6
  %14 = load i32, ptr %2, align 4, !tbaa !5
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = srem i32 %14, %15
  %17 = icmp eq i32 %16, 0
  br i1 %17, label %18, label %35

18:                                               ; preds = %13
  %19 = load i32, ptr %3, align 4, !tbaa !5
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = sdiv i32 %19, %20
  %22 = load i32, ptr %4, align 4, !tbaa !5
  %23 = sub nsw i32 %22, 1
  %24 = mul nsw i32 %21, %23
  store i32 %24, ptr %3, align 4, !tbaa !5
  br label %25

25:                                               ; preds = %30, %18
  %26 = load i32, ptr %2, align 4, !tbaa !5
  %27 = load i32, ptr %4, align 4, !tbaa !5
  %28 = srem i32 %26, %27
  %29 = icmp eq i32 %28, 0
  br i1 %29, label %30, label %34

30:                                               ; preds = %25
  %31 = load i32, ptr %4, align 4, !tbaa !5
  %32 = load i32, ptr %2, align 4, !tbaa !5
  %33 = sdiv i32 %32, %31
  store i32 %33, ptr %2, align 4, !tbaa !5
  br label %25, !llvm.loop !9

34:                                               ; preds = %25
  br label %35

35:                                               ; preds = %34, %13
  br label %36

36:                                               ; preds = %35
  %37 = load i32, ptr %4, align 4, !tbaa !5
  %38 = add nsw i32 %37, 1
  store i32 %38, ptr %4, align 4, !tbaa !5
  br label %6, !llvm.loop !11

39:                                               ; preds = %12
  %40 = load i32, ptr %2, align 4, !tbaa !5
  %41 = icmp sgt i32 %40, 1
  br i1 %41, label %42, label %49

42:                                               ; preds = %39
  %43 = load i32, ptr %3, align 4, !tbaa !5
  %44 = load i32, ptr %2, align 4, !tbaa !5
  %45 = sdiv i32 %43, %44
  %46 = load i32, ptr %2, align 4, !tbaa !5
  %47 = sub nsw i32 %46, 1
  %48 = mul nsw i32 %45, %47
  store i32 %48, ptr %3, align 4, !tbaa !5
  br label %49

49:                                               ; preds = %42, %39
  %50 = load i32, ptr %3, align 4, !tbaa !5
  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 @_Z3phii(i32 noundef %0) local_unnamed_addr #0 {
  %.not24 = icmp slt i32 %0, 4
  br i1 %.not24, label %._crit_edge, label %.lr.ph29

._crit_edge:                                      ; preds = %.loopexit, %1
  %.020.lcssa = phi i32 [ %0, %1 ], [ %.222, %.loopexit ]
  %.019.lcssa = phi i32 [ %0, %1 ], [ %.1, %.loopexit ]
  %2 = icmp sgt i32 %.020.lcssa, 1
  br i1 %2, label %13, label %17

.lr.ph29:                                         ; preds = %1, %.loopexit
  %.027 = phi i32 [ %11, %.loopexit ], [ 2, %1 ]
  %.01926 = phi i32 [ %.1, %.loopexit ], [ %0, %1 ]
  %.02025 = phi i32 [ %.222, %.loopexit ], [ %0, %1 ]
  %3 = srem i32 %.02025, %.027
  %4 = icmp eq i32 %3, 0
  br i1 %4, label %.lr.ph.preheader, label %.loopexit

.lr.ph.preheader:                                 ; preds = %.lr.ph29
  %5 = sdiv i32 %.01926, %.027
  %6 = add nsw i32 %.027, -1
  %7 = mul nsw i32 %5, %6
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %.12123 = phi i32 [ %8, %.lr.ph ], [ %.02025, %.lr.ph.preheader ]
  %8 = sdiv i32 %.12123, %.027
  %9 = srem i32 %8, %.027
  %10 = icmp eq i32 %9, 0
  br i1 %10, label %.lr.ph, label %.loopexit, !llvm.loop !5

.loopexit:                                        ; preds = %.lr.ph, %.lr.ph29
  %.222 = phi i32 [ %.02025, %.lr.ph29 ], [ %8, %.lr.ph ]
  %.1 = phi i32 [ %.01926, %.lr.ph29 ], [ %7, %.lr.ph ]
  %11 = add nuw nsw i32 %.027, 1
  %12 = sdiv i32 %.222, %11
  %.not.not = icmp slt i32 %.027, %12
  br i1 %.not.not, label %.lr.ph29, label %._crit_edge, !llvm.loop !7

13:                                               ; preds = %._crit_edge
  %14 = sdiv i32 %.019.lcssa, %.020.lcssa
  %15 = add nsw i32 %.020.lcssa, -1
  %16 = mul nsw i32 %14, %15
  br label %17

17:                                               ; preds = %13, %._crit_edge
  %.2 = phi i32 [ %16, %13 ], [ %.019.lcssa, %._crit_edge ]
  ret i32 %.2
}

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