; LLVM IR from wuzhouhui/leetcode :: 155_min_stack (minStackDestroy)

; 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.MinStack = type { ptr, ptr }
%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: nounwind
declare void @free(ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @minStackDestroy(ptr noundef %0) #2 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %4 = load ptr, ptr %2, align 8, !tbaa !5
  %5 = icmp ne ptr %4, null
  br i1 %5, label %6, label %11

6:                                                ; preds = %1
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  %8 = getelementptr inbounds %struct.MinStack, ptr %7, i32 0, i32 0
  %9 = load ptr, ptr %8, align 8, !tbaa !9
  %10 = icmp ne ptr %9, null
  br i1 %10, label %12, label %11

11:                                               ; preds = %6, %1
  br label %49

12:                                               ; preds = %6
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  br label %13

13:                                               ; preds = %18, %12
  %14 = load ptr, ptr %2, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.MinStack, ptr %14, i32 0, i32 0
  %16 = load ptr, ptr %15, align 8, !tbaa !9
  %17 = icmp ne ptr %16, null
  br i1 %17, label %18, label %30

18:                                               ; preds = %13
  %19 = load ptr, ptr %2, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.MinStack, ptr %19, i32 0, i32 0
  %21 = load ptr, ptr %20, align 8, !tbaa !9
  store ptr %21, ptr %3, align 8, !tbaa !5
  %22 = load ptr, ptr %2, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.MinStack, ptr %22, i32 0, i32 0
  %24 = load ptr, ptr %23, align 8, !tbaa !9
  %25 = getelementptr inbounds %struct.node, ptr %24, i32 0, i32 1
  %26 = load ptr, ptr %25, align 8, !tbaa !11
  %27 = load ptr, ptr %2, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.MinStack, ptr %27, i32 0, i32 0
  store ptr %26, ptr %28, align 8, !tbaa !9
  %29 = load ptr, ptr %3, align 8, !tbaa !5
  call void @free(ptr noundef %29) #3
  br label %13, !llvm.loop !14

30:                                               ; preds = %13
  br label %31

31:                                               ; preds = %36, %30
  %32 = load ptr, ptr %2, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.MinStack, ptr %32, i32 0, i32 1
  %34 = load ptr, ptr %33, align 8, !tbaa !16
  %35 = icmp ne ptr %34, null
  br i1 %35, label %36, label %48

36:                                               ; preds = %31
  %37 = load ptr, ptr %2, align 8, !tbaa !5
  %38 = getelementptr inbounds %struct.MinStack, ptr %37, i32 0, i32 1
  %39 = load ptr, ptr %38, align 8, !tbaa !16
  store ptr %39, ptr %3, align 8, !tbaa !5
  %40 = load ptr, ptr %2, align 8, !tbaa !5
  %41 = getelementptr inbounds %struct.MinStack, ptr %40, i32 0, i32 1
  %42 = load ptr, ptr %41, align 8, !tbaa !16
  %43 = getelementptr inbounds %struct.node, ptr %42, i32 0, i32 1
  %44 = load ptr, ptr %43, align 8, !tbaa !11
  %45 = load ptr, ptr %2, align 8, !tbaa !5
  %46 = getelementptr inbounds %struct.MinStack, ptr %45, i32 0, i32 1
  store ptr %44, ptr %46, align 8, !tbaa !16
  %47 = load ptr, ptr %3, align 8, !tbaa !5
  call void @free(ptr noundef %47) #3
  br label %31, !llvm.loop !17

48:                                               ; preds = %31
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  br label %49

49:                                               ; preds = %48, %11
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind "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 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 #3 = { 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, !6, i64 0}
!10 = !{!"", !6, i64 0, !6, i64 8}
!11 = !{!12, !6, i64 8}
!12 = !{!"node", !13, i64 0, !6, i64 8}
!13 = !{!"int", !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{!10, !6, i64 8}
!17 = distinct !{!17, !15}


; 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 nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @minStackDestroy(ptr noundef %0) local_unnamed_addr #1 {
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %.loopexit, label %2

2:                                                ; preds = %1
  %3 = load ptr, ptr %0, align 8, !tbaa !5
  %.not14 = icmp eq ptr %3, null
  br i1 %.not14, label %.loopexit, label %.preheader17

.preheader:                                       ; preds = %.preheader17
  %4 = getelementptr inbounds i8, ptr %0, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !10
  %.not1618 = icmp eq ptr %5, null
  br i1 %.not1618, label %.loopexit, label %.lr.ph

.preheader17:                                     ; preds = %2, %.preheader17
  %6 = phi ptr [ %.pr, %.preheader17 ], [ %3, %2 ]
  %7 = getelementptr inbounds i8, ptr %6, i64 8
  %8 = load ptr, ptr %7, align 8, !tbaa !11
  store ptr %8, ptr %0, align 8, !tbaa !5
  tail call void @free(ptr noundef nonnull %6) #2
  %.pr = load ptr, ptr %0, align 8, !tbaa !5
  %.not15 = icmp eq ptr %.pr, null
  br i1 %.not15, label %.preheader, label %.preheader17, !llvm.loop !14

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %9 = phi ptr [ %12, %.lr.ph ], [ %5, %.preheader ]
  %10 = getelementptr inbounds i8, ptr %9, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  store ptr %11, ptr %4, align 8, !tbaa !10
  tail call void @free(ptr noundef nonnull %9) #2
  %12 = load ptr, ptr %4, align 8, !tbaa !10
  %.not16 = icmp eq ptr %12, null
  br i1 %.not16, label %.loopexit, label %.lr.ph, !llvm.loop !16

.loopexit:                                        ; preds = %.lr.ph, %.preheader, %1, %2
  ret void
}

attributes #0 = { mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { 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, !7, i64 0}
!6 = !{!"", !7, i64 0, !7, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!6, !7, i64 8}
!11 = !{!12, !7, i64 8}
!12 = !{!"node", !13, i64 0, !7, i64 8}
!13 = !{!"int", !8, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}
!16 = distinct !{!16, !15}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass