; LLVM IR from mitdbg/deneva :: system/pool.ll (ZN7MsgPool8free_allEv)

; 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.mem_alloc = type { i8 }
%class.MsgPool = type { ptr, ptr }

@mem_allocator = external global %class.mem_alloc, align 1

; 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

declare void @_ZN9mem_alloc4freeEPvm(ptr noundef nonnull align 1 dereferenceable(1), ptr noundef, i64 noundef) #1

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_ZN5boost8lockfree5queueIP9msg_entryJEE3popERS3_(ptr noundef nonnull align 8 dereferenceable(136), ptr noundef nonnull align 8 dereferenceable(8)) #2 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN7MsgPool8free_allEv(ptr noundef nonnull align 8 dereferenceable(16) %0) #2 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) #3
  br label %5

5:                                                ; preds = %9, %1
  %6 = getelementptr inbounds %class.MsgPool, ptr %4, i32 0, i32 0
  %7 = load ptr, ptr %6, align 8, !tbaa !9
  %8 = call noundef zeroext i1 @_ZN5boost8lockfree5queueIP9msg_entryJEE3popERS3_(ptr noundef nonnull align 8 dereferenceable(136) %7, ptr noundef nonnull align 8 dereferenceable(8) %3)
  br i1 %8, label %9, label %11

9:                                                ; preds = %5
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  call void @_ZN9mem_alloc4freeEPvm(ptr noundef nonnull align 1 dereferenceable(1) @mem_allocator, ptr noundef %10, i64 noundef 8)
  br label %5, !llvm.loop !11

11:                                               ; preds = %5
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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" }
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 0}
!10 = !{!"_ZTS7MsgPool", !6, i64 0, !6, i64 8}
!11 = distinct !{!11, !12}
!12 = !{!"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"

%class.mem_alloc = type { i8 }

@mem_allocator = external global %class.mem_alloc, align 1

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

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

declare void @_ZN9mem_alloc4freeEPvm(ptr noundef nonnull align 1 dereferenceable(1), ptr noundef, i64 noundef) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_ZN5boost8lockfree5queueIP9msg_entryJEE3popERS3_(ptr noundef nonnull align 8 dereferenceable(136), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN7MsgPool8free_allEv(ptr nocapture noundef nonnull readonly align 8 dereferenceable(16) %0) local_unnamed_addr #2 align 2 {
  %2 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #3
  %3 = load ptr, ptr %0, align 8, !tbaa !5
  %4 = call noundef zeroext i1 @_ZN5boost8lockfree5queueIP9msg_entryJEE3popERS3_(ptr noundef nonnull align 8 dereferenceable(136) %3, ptr noundef nonnull align 8 dereferenceable(8) %2)
  br i1 %4, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %1, %.lr.ph
  %5 = load ptr, ptr %2, align 8, !tbaa !10
  call void @_ZN9mem_alloc4freeEPvm(ptr noundef nonnull align 1 dereferenceable(1) @mem_allocator, ptr noundef %5, i64 noundef 8)
  %6 = load ptr, ptr %0, align 8, !tbaa !5
  %7 = call noundef zeroext i1 @_ZN5boost8lockfree5queueIP9msg_entryJEE3popERS3_(ptr noundef nonnull align 8 dereferenceable(136) %6, ptr noundef nonnull align 8 dereferenceable(8) %2)
  br i1 %7, label %.lr.ph, label %._crit_edge, !llvm.loop !11

._crit_edge:                                      ; preds = %.lr.ph, %1
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #3
  ret void
}

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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" }
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, !7, i64 0}
!6 = !{!"_ZTS7MsgPool", !7, i64 0, !7, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!7, !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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