; LLVM IR from sachuverma/DataStructures-Algorithms :: DSA Crack Sheet/solutions/Mid Element Stack.ll (Z12deletemiddleP7myStack)

; 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, ptr, i32 }
%class.DLLNode = type { ptr, 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 i32 @_Z12deletemiddleP7myStack(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  %4 = load ptr, ptr %2, align 8, !tbaa !5
  %5 = getelementptr inbounds %class.myStack, ptr %4, i32 0, i32 1
  %6 = load ptr, ptr %5, align 8, !tbaa !9
  %7 = getelementptr inbounds %class.DLLNode, ptr %6, i32 0, i32 1
  %8 = load i32, ptr %7, align 8, !tbaa !12
  store i32 %8, ptr %3, align 4, !tbaa !14
  %9 = load ptr, ptr %2, align 8, !tbaa !5
  %10 = getelementptr inbounds %class.myStack, ptr %9, i32 0, i32 1
  %11 = load ptr, ptr %10, align 8, !tbaa !9
  %12 = getelementptr inbounds %class.DLLNode, ptr %11, i32 0, i32 2
  %13 = load ptr, ptr %12, align 8, !tbaa !15
  %14 = load ptr, ptr %2, align 8, !tbaa !5
  %15 = getelementptr inbounds %class.myStack, ptr %14, i32 0, i32 1
  %16 = load ptr, ptr %15, align 8, !tbaa !9
  %17 = getelementptr inbounds %class.DLLNode, ptr %16, i32 0, i32 0
  %18 = load ptr, ptr %17, align 8, !tbaa !16
  %19 = getelementptr inbounds %class.DLLNode, ptr %18, i32 0, i32 2
  store ptr %13, ptr %19, align 8, !tbaa !15
  %20 = load ptr, ptr %2, align 8, !tbaa !5
  %21 = getelementptr inbounds %class.myStack, ptr %20, i32 0, i32 1
  %22 = load ptr, ptr %21, align 8, !tbaa !9
  %23 = getelementptr inbounds %class.DLLNode, ptr %22, i32 0, i32 0
  %24 = load ptr, ptr %23, align 8, !tbaa !16
  %25 = getelementptr inbounds %class.DLLNode, ptr %24, i32 0, i32 2
  %26 = load ptr, ptr %25, align 8, !tbaa !15
  %27 = load ptr, ptr %2, align 8, !tbaa !5
  %28 = getelementptr inbounds %class.myStack, ptr %27, i32 0, i32 1
  %29 = load ptr, ptr %28, align 8, !tbaa !9
  %30 = getelementptr inbounds %class.DLLNode, ptr %29, i32 0, i32 2
  %31 = load ptr, ptr %30, align 8, !tbaa !15
  %32 = getelementptr inbounds %class.DLLNode, ptr %31, i32 0, i32 0
  store ptr %26, ptr %32, align 8, !tbaa !16
  %33 = load ptr, ptr %2, align 8, !tbaa !5
  %34 = getelementptr inbounds %class.myStack, ptr %33, i32 0, i32 1
  %35 = load ptr, ptr %34, align 8, !tbaa !9
  %36 = icmp eq ptr %35, null
  br i1 %36, label %38, label %37

37:                                               ; preds = %1
  call void @_ZdlPvm(ptr noundef %35, i64 noundef 24) #4
  br label %38

38:                                               ; preds = %37, %1
  %39 = load i32, ptr %3, align 4, !tbaa !14
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  ret i32 %39
}

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

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 = { 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 = { nounwind }
attributes #4 = { 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, !6, i64 8}
!10 = !{!"_ZTS7myStack", !6, i64 0, !6, i64 8, !11, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!13, !11, i64 8}
!13 = !{!"_ZTS7DLLNode", !6, i64 0, !11, i64 8, !6, i64 16}
!14 = !{!11, !11, i64 0}
!15 = !{!13, !6, i64 16}
!16 = !{!13, !6, i64 0}


; 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 uwtable
define dso_local noundef i32 @_Z12deletemiddleP7myStack(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 8
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %3, i64 8
  %5 = load i32, ptr %4, align 8, !tbaa !11
  %6 = getelementptr inbounds i8, ptr %3, i64 16
  %7 = load ptr, ptr %6, align 8, !tbaa !13
  %8 = load ptr, ptr %3, align 8, !tbaa !14
  %9 = getelementptr inbounds i8, ptr %8, i64 16
  store ptr %7, ptr %9, align 8, !tbaa !13
  store ptr %7, ptr %7, align 8, !tbaa !14
  tail call void @_ZdlPvm(ptr noundef %3, i64 noundef 24) #2
  ret i32 %5
}

; Function Attrs: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) local_unnamed_addr #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 = { 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 #2 = { 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, !7, i64 8}
!6 = !{!"_ZTS7myStack", !7, i64 0, !7, i64 8, !10, i64 16}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!12, !10, i64 8}
!12 = !{!"_ZTS7DLLNode", !7, i64 0, !10, i64 8, !7, i64 16}
!13 = !{!12, !7, i64 16}
!14 = !{!12, !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,PostOrderFunctionAttrsPass,SROAPass,TailCallElimPass