; LLVM IR from JessonYue/LeetCodeLearning :: Array/yangxin/第七周练习7_13-7_19/283. 移动零 (moveZeroes)

; 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: nounwind uwtable
define dso_local void @moveZeroes(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = icmp eq ptr %8, null
  br i1 %9, label %10, label %11

10:                                               ; preds = %2
  br label %55

11:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %12

12:                                               ; preds = %36, %11
  %13 = load i32, ptr %6, align 4, !tbaa !9
  %14 = load i32, ptr %4, align 4, !tbaa !9
  %15 = icmp slt i32 %13, %14
  br i1 %15, label %17, label %16

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

17:                                               ; preds = %12
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds i32, ptr %18, i64 %20
  %22 = load i32, ptr %21, align 4, !tbaa !9
  %23 = icmp ne i32 %22, 0
  br i1 %23, label %24, label %35

24:                                               ; preds = %17
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  %26 = load i32, ptr %6, align 4, !tbaa !9
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds i32, ptr %25, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !9
  %30 = load ptr, ptr %3, align 8, !tbaa !5
  %31 = load i32, ptr %5, align 4, !tbaa !9
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %5, align 4, !tbaa !9
  %33 = sext i32 %31 to i64
  %34 = getelementptr inbounds i32, ptr %30, i64 %33
  store i32 %29, ptr %34, align 4, !tbaa !9
  br label %35

35:                                               ; preds = %24, %17
  br label %36

36:                                               ; preds = %35
  %37 = load i32, ptr %6, align 4, !tbaa !9
  %38 = add nsw i32 %37, 1
  store i32 %38, ptr %6, align 4, !tbaa !9
  br label %12, !llvm.loop !11

39:                                               ; preds = %16
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %40 = load i32, ptr %5, align 4, !tbaa !9
  store i32 %40, ptr %7, align 4, !tbaa !9
  br label %41

41:                                               ; preds = %51, %39
  %42 = load i32, ptr %7, align 4, !tbaa !9
  %43 = load i32, ptr %4, align 4, !tbaa !9
  %44 = icmp slt i32 %42, %43
  br i1 %44, label %46, label %45

45:                                               ; preds = %41
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %54

46:                                               ; preds = %41
  %47 = load ptr, ptr %3, align 8, !tbaa !5
  %48 = load i32, ptr %7, align 4, !tbaa !9
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds i32, ptr %47, i64 %49
  store i32 0, ptr %50, align 4, !tbaa !9
  br label %51

51:                                               ; preds = %46
  %52 = load i32, ptr %7, align 4, !tbaa !9
  %53 = add nsw i32 %52, 1
  store i32 %53, ptr %7, align 4, !tbaa !9
  br label %41, !llvm.loop !13

54:                                               ; preds = %45
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %55

55:                                               ; preds = %54, %10
  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 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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: nofree norecurse nosync nounwind memory(argmem: readwrite) uwtable
define dso_local void @moveZeroes(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %0, null
  br i1 %3, label %.loopexit, label %.preheader20

.preheader20:                                     ; preds = %2
  %4 = icmp sgt i32 %1, 0
  br i1 %4, label %.lr.ph.preheader, label %.preheader

.lr.ph.preheader:                                 ; preds = %.preheader20
  %wide.trip.count = zext nneg i32 %1 to i64
  %xtraiter = and i64 %wide.trip.count, 1
  %5 = icmp eq i32 %1, 1
  br i1 %5, label %.preheader.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %wide.trip.count, 2147483646
  br label %.lr.ph

.preheader.loopexit.unr-lcssa:                    ; preds = %32, %.lr.ph.preheader
  %.1.lcssa.ph = phi i32 [ poison, %.lr.ph.preheader ], [ %.1.1, %32 ]
  %indvars.iv.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next.1, %32 ]
  %.01621.unr = phi i32 [ 0, %.lr.ph.preheader ], [ %.1.1, %32 ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.preheader, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %.preheader.loopexit.unr-lcssa
  %6 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.unr
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %.not.epil = icmp eq i32 %7, 0
  br i1 %.not.epil, label %.preheader, label %8

8:                                                ; preds = %.lr.ph.epil
  %9 = add nsw i32 %.01621.unr, 1
  %10 = sext i32 %.01621.unr to i64
  %11 = getelementptr inbounds i32, ptr %0, i64 %10
  store i32 %7, ptr %11, align 4, !tbaa !5
  br label %.preheader

.preheader:                                       ; preds = %.preheader.loopexit.unr-lcssa, %8, %.lr.ph.epil, %.preheader20
  %.016.lcssa = phi i32 [ 0, %.preheader20 ], [ %.1.lcssa.ph, %.preheader.loopexit.unr-lcssa ], [ %9, %8 ], [ %.01621.unr, %.lr.ph.epil ]
  %12 = icmp slt i32 %.016.lcssa, %1
  br i1 %12, label %.lr.ph24.preheader, label %.loopexit

.lr.ph24.preheader:                               ; preds = %.preheader
  %13 = sext i32 %.016.lcssa to i64
  %14 = shl nsw i64 %13, 2
  %scevgep = getelementptr i8, ptr %0, i64 %14
  %15 = xor i32 %.016.lcssa, -1
  %16 = add i32 %15, %1
  %17 = zext i32 %16 to i64
  %18 = shl nuw nsw i64 %17, 2
  %19 = add nuw nsw i64 %18, 4
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 4 dereferenceable(1) %scevgep, i8 0, i64 %19, i1 false), !tbaa !5
  br label %.loopexit

.lr.ph:                                           ; preds = %32, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader.new ], [ %indvars.iv.next.1, %32 ]
  %.01621 = phi i32 [ 0, %.lr.ph.preheader.new ], [ %.1.1, %32 ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %32 ]
  %20 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %.not = icmp eq i32 %21, 0
  br i1 %.not, label %.lr.ph.1, label %22

22:                                               ; preds = %.lr.ph
  %23 = add nsw i32 %.01621, 1
  %24 = sext i32 %.01621 to i64
  %25 = getelementptr inbounds i32, ptr %0, i64 %24
  store i32 %21, ptr %25, align 4, !tbaa !5
  br label %.lr.ph.1

.lr.ph.1:                                         ; preds = %.lr.ph, %22
  %.1 = phi i32 [ %23, %22 ], [ %.01621, %.lr.ph ]
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %26 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next
  %27 = load i32, ptr %26, align 4, !tbaa !5
  %.not.1 = icmp eq i32 %27, 0
  br i1 %.not.1, label %32, label %28

28:                                               ; preds = %.lr.ph.1
  %29 = add nsw i32 %.1, 1
  %30 = sext i32 %.1 to i64
  %31 = getelementptr inbounds i32, ptr %0, i64 %30
  store i32 %27, ptr %31, align 4, !tbaa !5
  br label %32

32:                                               ; preds = %28, %.lr.ph.1
  %.1.1 = phi i32 [ %29, %28 ], [ %.1, %.lr.ph.1 ]
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %niter.next.1 = add i64 %niter, 2
  %niter.ncmp.1 = icmp eq i64 %niter.next.1, %unroll_iter
  br i1 %niter.ncmp.1, label %.preheader.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !9

.loopexit:                                        ; preds = %.lr.ph24.preheader, %.preheader, %2
  ret void
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: readwrite) 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 nounwind willreturn memory(argmem: write) }

!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/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopIdiomRecognizePass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass