; LLVM IR from afrozchakure/Competitive-Programming-Solutions :: TopicWise/Linked List/StackUsingLL.ll (ZN7MyStack4pushEi)

; 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"

%class.MyStack = type { ptr }
%struct.StackNode = 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: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znwm(i64 noundef) #1

declare i32 @__gxx_personality_v0(...)

; Function Attrs: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) #2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN7MyStack4pushEi(ptr noundef nonnull align 8 dereferenceable(8) %0, i32 noundef %1) #3 align 2 personality ptr @__gxx_personality_v0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  %10 = load ptr, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #5
  %11 = call noalias noundef nonnull ptr @_Znwm(i64 noundef 16) #6
  %12 = load i32, ptr %4, align 4, !tbaa !9
  invoke void @_ZN9StackNodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16) %11, i32 noundef %12)
          to label %13 unwind label %20

13:                                               ; preds = %2
  store ptr %11, ptr %5, align 8, !tbaa !5
  %14 = getelementptr inbounds %class.MyStack, ptr %10, i32 0, i32 0
  %15 = load ptr, ptr %14, align 8, !tbaa !11
  %16 = icmp eq ptr %15, null
  br i1 %16, label %17, label %24

17:                                               ; preds = %13
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  %19 = getelementptr inbounds %class.MyStack, ptr %10, i32 0, i32 0
  store ptr %18, ptr %19, align 8, !tbaa !11
  store i32 1, ptr %8, align 4
  br label %53

20:                                               ; preds = %2
  %21 = landingpad { ptr, i32 }
          cleanup
  %22 = extractvalue { ptr, i32 } %21, 0
  store ptr %22, ptr %6, align 8
  %23 = extractvalue { ptr, i32 } %21, 1
  store i32 %23, ptr %7, align 4
  call void @_ZdlPvm(ptr noundef %11, i64 noundef 16) #7
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #5
  br label %54

24:                                               ; preds = %13
  %25 = getelementptr inbounds %class.MyStack, ptr %10, i32 0, i32 0
  %26 = load ptr, ptr %25, align 8, !tbaa !11
  %27 = getelementptr inbounds %struct.StackNode, ptr %26, i32 0, i32 1
  %28 = load ptr, ptr %27, align 8, !tbaa !13
  %29 = icmp eq ptr %28, null
  br i1 %29, label %30, label %35

30:                                               ; preds = %24
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = getelementptr inbounds %class.MyStack, ptr %10, i32 0, i32 0
  %33 = load ptr, ptr %32, align 8, !tbaa !11
  %34 = getelementptr inbounds %struct.StackNode, ptr %33, i32 0, i32 1
  store ptr %31, ptr %34, align 8, !tbaa !13
  store i32 1, ptr %8, align 4
  br label %53

35:                                               ; preds = %24
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #5
  %36 = getelementptr inbounds %class.MyStack, ptr %10, i32 0, i32 0
  %37 = load ptr, ptr %36, align 8, !tbaa !11
  store ptr %37, ptr %9, align 8, !tbaa !5
  br label %38

38:                                               ; preds = %43, %35
  %39 = load ptr, ptr %9, align 8, !tbaa !5
  %40 = getelementptr inbounds %struct.StackNode, ptr %39, i32 0, i32 1
  %41 = load ptr, ptr %40, align 8, !tbaa !13
  %42 = icmp ne ptr %41, null
  br i1 %42, label %43, label %47

43:                                               ; preds = %38
  %44 = load ptr, ptr %9, align 8, !tbaa !5
  %45 = getelementptr inbounds %struct.StackNode, ptr %44, i32 0, i32 1
  %46 = load ptr, ptr %45, align 8, !tbaa !13
  store ptr %46, ptr %9, align 8, !tbaa !5
  br label %38, !llvm.loop !15

47:                                               ; preds = %38
  %48 = load ptr, ptr %5, align 8, !tbaa !5
  %49 = load ptr, ptr %9, align 8, !tbaa !5
  %50 = getelementptr inbounds %struct.StackNode, ptr %49, i32 0, i32 1
  store ptr %48, ptr %50, align 8, !tbaa !13
  %51 = load ptr, ptr %5, align 8, !tbaa !5
  %52 = getelementptr inbounds %struct.StackNode, ptr %51, i32 0, i32 1
  store ptr null, ptr %52, align 8, !tbaa !13
  store i32 1, ptr %8, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #5
  br label %53

53:                                               ; preds = %47, %30, %17
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #5
  ret void

54:                                               ; preds = %20
  %55 = load ptr, ptr %6, align 8
  %56 = load i32, ptr %7, align 4
  %57 = insertvalue { ptr, i32 } poison, ptr %55, 0
  %58 = insertvalue { ptr, i32 } %57, i32 %56, 1
  resume { ptr, i32 } %58
}

; 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
declare dso_local void @_ZN9StackNodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16), i32 noundef) unnamed_addr #4 align 2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nobuiltin allocsize(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 = { nobuiltin 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 #3 = { mustprogress 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 #4 = { 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 #5 = { nounwind }
attributes #6 = { builtin allocsize(0) }
attributes #7 = { builtin 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 0}
!12 = !{!"_ZTS7MyStack", !6, i64 0}
!13 = !{!14, !6, i64 8}
!14 = !{!"_ZTS9StackNode", !10, i64 0, !6, i64 8}
!15 = distinct !{!15, !16}
!16 = !{!"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: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znwm(i64 noundef) local_unnamed_addr #0

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN7MyStack4pushEi(ptr nocapture noundef nonnull align 8 dereferenceable(8) %0, i32 noundef %1) local_unnamed_addr #1 align 2 personality ptr @__gxx_personality_v0 {
  %3 = tail call noalias noundef nonnull dereferenceable(16) ptr @_Znwm(i64 noundef 16) #3
  tail call void @_ZN9StackNodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16) %3, i32 noundef %1)
  %4 = load ptr, ptr %0, align 8, !tbaa !5
  %5 = icmp eq ptr %4, null
  br i1 %5, label %6, label %7

6:                                                ; preds = %2
  store ptr %3, ptr %0, align 8, !tbaa !5
  br label %17

7:                                                ; preds = %2
  %8 = getelementptr inbounds i8, ptr %4, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !10
  %10 = icmp eq ptr %9, null
  br i1 %10, label %11, label %.preheader

11:                                               ; preds = %7
  store ptr %3, ptr %8, align 8, !tbaa !10
  br label %17

.preheader:                                       ; preds = %7, %.preheader
  %.0 = phi ptr [ %13, %.preheader ], [ %4, %7 ]
  %12 = getelementptr inbounds i8, ptr %.0, i64 8
  %13 = load ptr, ptr %12, align 8, !tbaa !10
  %.not = icmp eq ptr %13, null
  br i1 %.not, label %14, label %.preheader, !llvm.loop !13

14:                                               ; preds = %.preheader
  %15 = getelementptr inbounds i8, ptr %.0, i64 8
  store ptr %3, ptr %15, align 8, !tbaa !10
  %16 = getelementptr inbounds i8, ptr %3, i64 8
  store ptr null, ptr %16, align 8, !tbaa !10
  br label %17

17:                                               ; preds = %14, %11, %6
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN9StackNodeC2Ei(ptr noundef nonnull align 8 dereferenceable(16), i32 noundef) unnamed_addr #2 align 2

attributes #0 = { nobuiltin allocsize(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 = { mustprogress 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 = { 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 #3 = { builtin allocsize(0) }

!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 = !{!"_ZTS7MyStack", !7, i64 0}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!11, !7, i64 8}
!11 = !{!"_ZTS9StackNode", !12, i64 0, !7, i64 8}
!12 = !{!"int", !8, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


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