; LLVM IR from Lodour/ACM-CheatSheet :: src/2_数学/2_欧拉函数/2_筛法求欧拉函数.ll (Z8CalEulerv)

; 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"

@phi = external dso_local global <{ i32, i32, [9999 x i32] }>, align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z8CalEulerv() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  store i32 2, ptr %1, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %50, %0
  %5 = load i32, ptr %1, align 4, !tbaa !5
  %6 = icmp slt i32 %5, 10001
  br i1 %6, label %8, label %7

7:                                                ; preds = %4
  store i32 2, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #2
  br label %53

8:                                                ; preds = %4
  %9 = load i32, ptr %1, align 4, !tbaa !5
  %10 = sext i32 %9 to i64
  %11 = getelementptr inbounds [10001 x i32], ptr @phi, i64 0, i64 %10
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = icmp ne i32 %12, 0
  br i1 %13, label %49, label %14

14:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  %15 = load i32, ptr %1, align 4, !tbaa !5
  store i32 %15, ptr %3, align 4, !tbaa !5
  br label %16

16:                                               ; preds = %44, %14
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = icmp slt i32 %17, 10001
  br i1 %18, label %20, label %19

19:                                               ; preds = %16
  store i32 5, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  br label %48

20:                                               ; preds = %16
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [10001 x i32], ptr @phi, i64 0, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !5
  %25 = icmp ne i32 %24, 0
  br i1 %25, label %31, label %26

26:                                               ; preds = %20
  %27 = load i32, ptr %3, align 4, !tbaa !5
  %28 = load i32, ptr %3, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [10001 x i32], ptr @phi, i64 0, i64 %29
  store i32 %27, ptr %30, align 4, !tbaa !5
  br label %31

31:                                               ; preds = %26, %20
  %32 = load i32, ptr %3, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds [10001 x i32], ptr @phi, i64 0, i64 %33
  %35 = load i32, ptr %34, align 4, !tbaa !5
  %36 = load i32, ptr %1, align 4, !tbaa !5
  %37 = sdiv i32 %35, %36
  %38 = load i32, ptr %1, align 4, !tbaa !5
  %39 = sub nsw i32 %38, 1
  %40 = mul nsw i32 %37, %39
  %41 = load i32, ptr %3, align 4, !tbaa !5
  %42 = sext i32 %41 to i64
  %43 = getelementptr inbounds [10001 x i32], ptr @phi, i64 0, i64 %42
  store i32 %40, ptr %43, align 4, !tbaa !5
  br label %44

44:                                               ; preds = %31
  %45 = load i32, ptr %1, align 4, !tbaa !5
  %46 = load i32, ptr %3, align 4, !tbaa !5
  %47 = add nsw i32 %46, %45
  store i32 %47, ptr %3, align 4, !tbaa !5
  br label %16, !llvm.loop !9

48:                                               ; preds = %19
  br label %49

49:                                               ; preds = %48, %8
  br label %50

50:                                               ; preds = %49
  %51 = load i32, ptr %1, align 4, !tbaa !5
  %52 = add nsw i32 %51, 1
  store i32 %52, ptr %1, align 4, !tbaa !5
  br label %4, !llvm.loop !11

53:                                               ; preds = %7
  ret void
}

; 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"

@phi = external dso_local local_unnamed_addr global <{ i32, i32, [9999 x i32] }>, align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z8CalEulerv() local_unnamed_addr #0 {
  br label %2

1:                                                ; preds = %.loopexit
  ret void

2:                                                ; preds = %0, %.loopexit
  %indvars.iv = phi i64 [ 2, %0 ], [ %indvars.iv.next, %.loopexit ]
  %3 = getelementptr inbounds [10001 x i32], ptr @phi, i64 0, i64 %indvars.iv
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %.not = icmp eq i32 %4, 0
  br i1 %.not, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %2
  %5 = trunc nuw nsw i64 %indvars.iv to i32
  %6 = trunc i64 %indvars.iv to i32
  %7 = add i32 %6, -1
  br label %8

8:                                                ; preds = %.lr.ph, %8
  %indvars.iv19 = phi i64 [ %indvars.iv, %.lr.ph ], [ %indvars.iv.next20, %8 ]
  %9 = getelementptr inbounds [10001 x i32], ptr @phi, i64 0, i64 %indvars.iv19
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %.not15 = icmp eq i32 %10, 0
  %11 = trunc nuw nsw i64 %indvars.iv19 to i32
  %spec.select = select i1 %.not15, i32 %11, i32 %10
  %12 = sdiv i32 %spec.select, %5
  %13 = mul nsw i32 %12, %7
  store i32 %13, ptr %9, align 4, !tbaa !5
  %indvars.iv.next20 = add nuw nsw i64 %indvars.iv19, %indvars.iv
  %14 = icmp ult i64 %indvars.iv.next20, 10001
  br i1 %14, label %8, label %.loopexit, !llvm.loop !9

.loopexit:                                        ; preds = %8, %2
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, 10001
  br i1 %exitcond.not, label %1, label %2, !llvm.loop !11
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: 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 = !{!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}


; Effective O3 passes: DSEPass,EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass