; LLVM IR from iksha-rudra/Computational-Geometry :: CGAlgorithms/DataStructures/linkedstack.ll (ZN11LinkedStack3topEv)

; 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.Point = type { i32, i32 }
%class.LinkedStack = type { ptr }
%"struct.LinkedStack::Node" = type { %class.Point, ptr }

@.str.1 = external hidden unnamed_addr constant [11 x i8], align 1

declare i32 @printf(ptr noundef, ...) #0

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1

declare void @_ZN5PointC1Eii(ptr noundef nonnull align 4 dereferenceable(8), i32 noundef, i32 noundef) unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local i64 @_ZN11LinkedStack3topEv(ptr noundef nonnull align 8 dereferenceable(8) %0) #2 align 2 {
  %2 = alloca %class.Point, align 4
  %3 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  %4 = load ptr, ptr %3, align 8
  call void @_ZN5PointC1Eii(ptr noundef nonnull align 4 dereferenceable(8) %2, i32 noundef 0, i32 noundef 0)
  %5 = getelementptr inbounds %class.LinkedStack, ptr %4, i32 0, i32 0
  %6 = load ptr, ptr %5, align 8, !tbaa !9
  %7 = icmp ne ptr %6, null
  br i1 %7, label %10, label %8

8:                                                ; preds = %1
  %9 = call i32 (ptr, ...) @printf(ptr noundef @.str.1)
  br label %14

10:                                               ; preds = %1
  %11 = getelementptr inbounds %class.LinkedStack, ptr %4, i32 0, i32 0
  %12 = load ptr, ptr %11, align 8, !tbaa !9
  %13 = getelementptr inbounds %"struct.LinkedStack::Node", ptr %12, i32 0, i32 0
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %2, ptr align 8 %13, i64 8, i1 false), !tbaa.struct !11
  br label %14

14:                                               ; preds = %10, %8
  %15 = load i64, ptr %2, align 4
  ret i64 %15
}

attributes #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: readwrite) }
attributes #2 = { 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" }

!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 0}
!10 = !{!"_ZTS11LinkedStack", !6, i64 0}
!11 = !{i64 0, i64 4, !12, i64 4, i64 4, !12}
!12 = !{!13, !13, i64 0}
!13 = !{!"int", !7, 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"

%class.Point = type { i32, i32 }

@.str.1 = external hidden unnamed_addr constant [11 x i8], align 1

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #0

declare void @_ZN5PointC1Eii(ptr noundef nonnull align 4 dereferenceable(8), i32 noundef, i32 noundef) unnamed_addr #1

; Function Attrs: mustprogress uwtable
define dso_local i64 @_ZN11LinkedStack3topEv(ptr nocapture noundef nonnull readonly align 8 dereferenceable(8) %0) local_unnamed_addr #2 align 2 {
  %2 = alloca %class.Point, align 4
  call void @_ZN5PointC1Eii(ptr noundef nonnull align 4 dereferenceable(8) %2, i32 noundef 0, i32 noundef 0)
  %3 = load ptr, ptr %0, align 8, !tbaa !5
  %.not = icmp eq ptr %3, null
  br i1 %.not, label %4, label %6

4:                                                ; preds = %1
  %5 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1)
  br label %6

6:                                                ; preds = %1, %4
  %.in = phi ptr [ %2, %4 ], [ %3, %1 ]
  %7 = load i64, ptr %.in, align 4
  ret i64 %7
}

attributes #0 = { nofree 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 #1 = { "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 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, !7, i64 0}
!6 = !{!"_ZTS11LinkedStack", !7, i64 0}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}


; Effective O3 passes: DSEPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass