; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/ds/best_fit_memory.ll (Z10deallocateP13MemoryManager11MemoryBlock)

; 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.MemoryBlock = type { i32, i32 }
%struct.MemoryManager = type { %struct.MemoryBlock, ptr, 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 nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z10deallocateP13MemoryManager11MemoryBlock(ptr noundef %0, i64 %1) #2 {
  %3 = alloca %struct.MemoryBlock, align 4
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  store i64 %1, ptr %3, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  %7 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %7, ptr %5, align 8, !tbaa !5
  br label %8

8:                                                ; preds = %13, %2
  %9 = load ptr, ptr %5, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.MemoryManager, ptr %9, i32 0, i32 2
  %11 = load ptr, ptr %10, align 8, !tbaa !9
  %12 = icmp ne ptr %11, null
  br i1 %12, label %13, label %17

13:                                               ; preds = %8
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.MemoryManager, ptr %14, i32 0, i32 2
  %16 = load ptr, ptr %15, align 8, !tbaa !9
  store ptr %16, ptr %5, align 8, !tbaa !5
  br label %8, !llvm.loop !13

17:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #4
  %18 = call noalias noundef nonnull ptr @_Znwm(i64 noundef 24) #5
  store ptr %18, ptr %6, align 8, !tbaa !5
  %19 = load ptr, ptr %6, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.MemoryManager, ptr %19, i32 0, i32 0
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %20, ptr align 4 %3, i64 8, i1 false), !tbaa.struct !15
  %21 = load ptr, ptr %6, align 8, !tbaa !5
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.MemoryManager, ptr %22, i32 0, i32 2
  store ptr %21, ptr %23, align 8, !tbaa !9
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = load ptr, ptr %6, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.MemoryManager, ptr %25, i32 0, i32 1
  store ptr %24, ptr %26, align 8, !tbaa !17
  %27 = load ptr, ptr %6, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.MemoryManager, ptr %27, i32 0, i32 2
  store ptr null, ptr %28, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #4
  ret void
}

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znwm(i64 noundef) #3

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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" }
attributes #3 = { 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 #4 = { nounwind }
attributes #5 = { 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, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !6, i64 16}
!10 = !{!"_ZTS13MemoryManager", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"_ZTS11MemoryBlock", !12, i64 0, !12, i64 4}
!12 = !{!"int", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{i64 0, i64 4, !16, i64 4, i64 4, !16}
!16 = !{!12, !12, i64 0}
!17 = !{!10, !6, i64 8}


; 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 uwtable
define dso_local void @_Z10deallocateP13MemoryManager11MemoryBlock(ptr noundef %0, i64 %1) local_unnamed_addr #0 {
  br label %3

3:                                                ; preds = %3, %2
  %.0 = phi ptr [ %0, %2 ], [ %5, %3 ]
  %4 = getelementptr inbounds i8, ptr %.0, i64 16
  %5 = load ptr, ptr %4, align 8, !tbaa !5
  %.not = icmp eq ptr %5, null
  br i1 %.not, label %6, label %3, !llvm.loop !12

6:                                                ; preds = %3
  %7 = getelementptr inbounds i8, ptr %.0, i64 16
  %8 = tail call noalias noundef nonnull dereferenceable(24) ptr @_Znwm(i64 noundef 24) #2
  store i64 %1, ptr %8, align 8
  store ptr %8, ptr %7, align 8, !tbaa !5
  %9 = getelementptr inbounds i8, ptr %8, i64 8
  store ptr %.0, ptr %9, align 8, !tbaa !14
  %10 = getelementptr inbounds i8, ptr %8, i64 16
  store ptr null, ptr %10, align 8, !tbaa !5
  ret void
}

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znwm(i64 noundef) local_unnamed_addr #1

attributes #0 = { 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 #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 = { 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, !11, i64 16}
!6 = !{!"_ZTS13MemoryManager", !7, i64 0, !11, i64 8, !11, i64 16}
!7 = !{!"_ZTS11MemoryBlock", !8, i64 0, !8, i64 4}
!8 = !{!"int", !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C++ TBAA"}
!11 = !{!"any pointer", !9, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{!6, !11, i64 8}


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