; LLVM IR from knizhnik/cppgc :: gc.ll (ZN2GC15MemoryAllocatorD2Ev)

; 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.GC::MemoryAllocator" = type { i64, ptr, ptr, ptr, i64, i64 }
%"struct.GC::ObjectHeader" = type { 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 void @_ZN2GC15MemoryAllocatorD2Ev(ptr noundef nonnull align 8 dereferenceable(48) %0) unnamed_addr #1 align 2 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %5 = load ptr, ptr %2, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %6 = getelementptr inbounds %"class.GC::MemoryAllocator", ptr %5, i32 0, i32 2
  %7 = load ptr, ptr %6, align 8, !tbaa !9
  store ptr %7, ptr %3, align 8, !tbaa !5
  br label %8

8:                                                ; preds = %19, %1
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = icmp ne ptr %9, null
  br i1 %10, label %11, label %21

11:                                               ; preds = %8
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = getelementptr inbounds %"struct.GC::ObjectHeader", ptr %12, i32 0, i32 0
  %14 = load ptr, ptr %13, align 8, !tbaa !12
  %15 = ptrtoint ptr %14 to i64
  %16 = and i64 %15, -2
  %17 = inttoptr i64 %16 to ptr
  store ptr %17, ptr %4, align 8, !tbaa !5
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  call void @free(ptr noundef %18) #3
  br label %19

19:                                               ; preds = %11
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %20, ptr %3, align 8, !tbaa !5
  br label %8, !llvm.loop !14

21:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret void
}

; Function Attrs: nounwind
declare void @free(ptr 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 = { 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 }

!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 = !{!"_ZTSN2GC15MemoryAllocatorE", !11, i64 0, !6, i64 8, !6, i64 16, !6, i64 24, !11, i64 32, !11, i64 40}
!11 = !{!"long", !7, i64 0}
!12 = !{!13, !6, i64 0}
!13 = !{!"_ZTSN2GC12ObjectHeaderE", !6, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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: mustprogress nounwind uwtable
define dso_local void @_ZN2GC15MemoryAllocatorD2Ev(ptr nocapture noundef nonnull readonly align 8 dereferenceable(48) %0) unnamed_addr #0 align 2 {
  %2 = getelementptr inbounds i8, ptr %0, i64 16
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %.not5 = icmp eq ptr %3, null
  br i1 %.not5, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.06 = phi ptr [ %7, %.lr.ph ], [ %3, %1 ]
  %4 = load ptr, ptr %.06, align 8, !tbaa !11
  %5 = ptrtoint ptr %4 to i64
  %6 = and i64 %5, -2
  %7 = inttoptr i64 %6 to ptr
  tail call void @free(ptr noundef nonnull %.06) #2
  %.not = icmp eq i64 %6, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph, %1
  ret void
}

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture 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 = { mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { 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, !10, i64 16}
!6 = !{!"_ZTSN2GC15MemoryAllocatorE", !7, i64 0, !10, i64 8, !10, i64 16, !10, i64 24, !7, i64 32, !7, i64 40}
!7 = !{!"long", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"_ZTSN2GC12ObjectHeaderE", !10, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass