; LLVM IR from JessonYue/LeetCodeLearning :: Array/zhouhongkun/C++/CLionProjectsKthToLast/main.ll (Z17delReciprocalNodeP5_nodeii)

; 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"

%struct._node = type { i32, ptr }

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef ptr @_Z17delReciprocalNodeP5_nodeii(ptr noundef %0, i32 noundef %1, i32 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct._node, ptr %10, i32 0, i32 1
  %12 = load ptr, ptr %11, align 8, !tbaa !11
  store ptr %12, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %13, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  store i32 0, ptr %9, align 4, !tbaa !9
  br label %14

14:                                               ; preds = %38, %3
  %15 = load ptr, ptr %7, align 8, !tbaa !5
  %16 = icmp ne ptr %15, null
  br i1 %16, label %17, label %39

17:                                               ; preds = %14
  %18 = load i32, ptr %9, align 4, !tbaa !9
  %19 = load i32, ptr %5, align 4, !tbaa !9
  %20 = load i32, ptr %6, align 4, !tbaa !9
  %21 = sub nsw i32 %19, %20
  %22 = icmp eq i32 %18, %21
  br i1 %22, label %23, label %29

23:                                               ; preds = %17
  %24 = load ptr, ptr %7, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct._node, ptr %24, i32 0, i32 1
  %26 = load ptr, ptr %25, align 8, !tbaa !11
  %27 = load ptr, ptr %8, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct._node, ptr %27, i32 0, i32 1
  store ptr %26, ptr %28, align 8, !tbaa !11
  br label %39

29:                                               ; preds = %17
  %30 = load i32, ptr %9, align 4, !tbaa !9
  %31 = add nsw i32 %30, 1
  store i32 %31, ptr %9, align 4, !tbaa !9
  %32 = load ptr, ptr %7, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct._node, ptr %32, i32 0, i32 1
  %34 = load ptr, ptr %33, align 8, !tbaa !11
  store ptr %34, ptr %7, align 8, !tbaa !5
  %35 = load ptr, ptr %8, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct._node, ptr %35, i32 0, i32 1
  %37 = load ptr, ptr %36, align 8, !tbaa !11
  store ptr %37, ptr %8, align 8, !tbaa !5
  br label %38

38:                                               ; preds = %29
  br label %14, !llvm.loop !13

39:                                               ; preds = %23, %14
  %40 = load ptr, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  ret ptr %40
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 8}
!12 = !{!"_ZTS5_node", !10, i64 0, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"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 norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local noundef ptr @_Z17delReciprocalNodeP5_nodeii(ptr noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %.012.in16 = getelementptr inbounds i8, ptr %0, i64 8
  %.01217 = load ptr, ptr %.012.in16, align 8, !tbaa !5
  %.not18 = icmp eq ptr %.01217, null
  br i1 %.not18, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %3
  %4 = sub nsw i32 %1, %2
  br label %5

5:                                                ; preds = %.lr.ph, %11
  %.01221 = phi ptr [ %.01217, %.lr.ph ], [ %.012, %11 ]
  %.020 = phi i32 [ 0, %.lr.ph ], [ %12, %11 ]
  %.01119 = phi ptr [ %0, %.lr.ph ], [ %14, %11 ]
  %6 = icmp eq i32 %.020, %4
  br i1 %6, label %7, label %11

7:                                                ; preds = %5
  %8 = getelementptr inbounds i8, ptr %.01221, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %10 = getelementptr inbounds i8, ptr %.01119, i64 8
  store ptr %9, ptr %10, align 8, !tbaa !5
  br label %.loopexit

11:                                               ; preds = %5
  %12 = add nuw nsw i32 %.020, 1
  %13 = getelementptr inbounds i8, ptr %.01119, i64 8
  %14 = load ptr, ptr %13, align 8, !tbaa !5
  %.012.in = getelementptr inbounds i8, ptr %.01221, i64 8
  %.012 = load ptr, ptr %.012.in, align 8, !tbaa !5
  %.not = icmp eq ptr %.012, null
  br i1 %.not, label %.loopexit, label %5, !llvm.loop !11

.loopexit:                                        ; preds = %11, %3, %7
  %.01115 = phi ptr [ %.01119, %7 ], [ %0, %3 ], [ %14, %11 ]
  ret ptr %.01115
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(readwrite, 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, !10, i64 8}
!6 = !{!"_ZTS5_node", !7, i64 0, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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