; LLVM IR from FlorentCLMichel/palisade :: src/core/lib/utils/blockAllocator/blockAllocator.ll (ZN9Allocator3PopEv)

; 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.Allocator = type { i64, i64, i32, i32, ptr, ptr, i32, i32, i32, i32, i32, ptr }
%"struct.Allocator::Block" = type { ptr }

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef ptr @_ZN9Allocator3PopEv(ptr noundef nonnull align 8 dereferenceable(72) %0) #0 align 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
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  store ptr null, ptr %3, align 8, !tbaa !5
  %5 = getelementptr inbounds %class.Allocator, ptr %4, i32 0, i32 4
  %6 = load ptr, ptr %5, align 8, !tbaa !9
  %7 = icmp ne ptr %6, null
  br i1 %7, label %8, label %16

8:                                                ; preds = %1
  %9 = getelementptr inbounds %class.Allocator, ptr %4, i32 0, i32 4
  %10 = load ptr, ptr %9, align 8, !tbaa !9
  store ptr %10, ptr %3, align 8, !tbaa !5
  %11 = getelementptr inbounds %class.Allocator, ptr %4, i32 0, i32 4
  %12 = load ptr, ptr %11, align 8, !tbaa !9
  %13 = getelementptr inbounds %"struct.Allocator::Block", ptr %12, i32 0, i32 0
  %14 = load ptr, ptr %13, align 8, !tbaa !14
  %15 = getelementptr inbounds %class.Allocator, ptr %4, i32 0, i32 4
  store ptr %14, ptr %15, align 8, !tbaa !9
  br label %16

16:                                               ; preds = %8, %1
  %17 = load ptr, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret ptr %17
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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, !6, i64 24}
!10 = !{!"_ZTS9Allocator", !11, i64 0, !11, i64 8, !12, i64 16, !13, i64 20, !6, i64 24, !6, i64 32, !12, i64 40, !12, i64 44, !12, i64 48, !12, i64 52, !12, i64 56, !6, i64 64}
!11 = !{!"long", !7, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!"_ZTSN9Allocator13AllocatorModeE", !7, i64 0}
!14 = !{!15, !6, i64 0}
!15 = !{!"_ZTSN9Allocator5BlockE", !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 nofree norecurse nosync nounwind willreturn memory(read, argmem: readwrite, inaccessiblemem: none) uwtable
define dso_local noundef ptr @_ZN9Allocator3PopEv(ptr nocapture noundef nonnull align 8 dereferenceable(72) %0) local_unnamed_addr #0 align 2 {
  %2 = getelementptr inbounds i8, ptr %0, i64 24
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %.not = icmp eq ptr %3, null
  br i1 %.not, label %6, label %4

4:                                                ; preds = %1
  %5 = load ptr, ptr %3, align 8, !tbaa !13
  store ptr %5, ptr %2, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %4, %1
  ret ptr %3
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: 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, !12, i64 24}
!6 = !{!"_ZTS9Allocator", !7, i64 0, !7, i64 8, !10, i64 16, !11, i64 20, !12, i64 24, !12, i64 32, !10, i64 40, !10, i64 44, !10, i64 48, !10, i64 52, !10, i64 56, !12, i64 64}
!7 = !{!"long", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!"_ZTSN9Allocator13AllocatorModeE", !8, i64 0}
!12 = !{!"any pointer", !8, i64 0}
!13 = !{!14, !12, i64 0}
!14 = !{!"_ZTSN9Allocator5BlockE", !12, i64 0}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass