; LLVM IR from facebook/redex :: service/regalloc/VirtualRegistersFile.ll (ZN8regalloc20VirtualRegistersFile4freeEtm)

; 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.regalloc::VirtualRegistersFile" = type { %"class.boost::dynamic_bitset" }
%"class.boost::dynamic_bitset" = type { %"class.std::vector", i64 }
%"class.std::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<unsigned long, std::allocator<unsigned long>>::_Vector_impl" }
%"struct.std::_Vector_base<unsigned long, std::allocator<unsigned long>>::_Vector_impl" = type { %"struct.std::_Vector_base<unsigned long, std::allocator<unsigned long>>::_Vector_impl_data" }
%"struct.std::_Vector_base<unsigned long, std::allocator<unsigned long>>::_Vector_impl_data" = type { ptr, 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 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 @_ZN8regalloc20VirtualRegistersFile4freeEtm(ptr noundef nonnull align 8 dereferenceable(32) %0, i16 noundef zeroext %1, i64 noundef %2) #1 align 2 {
  %4 = alloca ptr, align 8
  %5 = alloca i16, align 2
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i16 %1, ptr %5, align 2, !tbaa !9
  store i64 %2, ptr %6, align 8, !tbaa !11
  %8 = load ptr, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  store i64 0, ptr %7, align 8, !tbaa !11
  br label %9

9:                                                ; preds = %21, %3
  %10 = load i64, ptr %7, align 8, !tbaa !11
  %11 = load i64, ptr %6, align 8, !tbaa !11
  %12 = icmp ult i64 %10, %11
  br i1 %12, label %14, label %13

13:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  br label %24

14:                                               ; preds = %9
  %15 = getelementptr inbounds %"class.regalloc::VirtualRegistersFile", ptr %8, i32 0, i32 0
  %16 = load i16, ptr %5, align 2, !tbaa !9
  %17 = zext i16 %16 to i64
  %18 = load i64, ptr %7, align 8, !tbaa !11
  %19 = add i64 %17, %18
  %20 = call noundef nonnull align 8 dereferenceable(32) ptr @_ZN5boost14dynamic_bitsetImSaImEE3setEmb(ptr noundef nonnull align 8 dereferenceable(32) %15, i64 noundef %19, i1 noundef zeroext true)
  br label %21

21:                                               ; preds = %14
  %22 = load i64, ptr %7, align 8, !tbaa !11
  %23 = add i64 %22, 1
  store i64 %23, ptr %7, align 8, !tbaa !11
  br label %9, !llvm.loop !13

24:                                               ; preds = %13
  ret void
}

; Function Attrs: mustprogress uwtable
declare dso_local noundef nonnull align 8 dereferenceable(32) ptr @_ZN5boost14dynamic_bitsetImSaImEE3setEmb(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef, i1 noundef zeroext) #1 align 2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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, !10, i64 0}
!10 = !{!"short", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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 uwtable
define dso_local void @_ZN8regalloc20VirtualRegistersFile4freeEtm(ptr noundef nonnull align 8 dereferenceable(32) %0, i16 noundef zeroext %1, i64 noundef %2) local_unnamed_addr #0 align 2 {
  %.not = icmp eq i64 %2, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %3
  %4 = zext i16 %1 to i64
  br label %5

._crit_edge:                                      ; preds = %5, %3
  ret void

5:                                                ; preds = %.lr.ph, %5
  %.05 = phi i64 [ 0, %.lr.ph ], [ %8, %5 ]
  %6 = add i64 %.05, %4
  %7 = tail call noundef nonnull align 8 dereferenceable(32) ptr @_ZN5boost14dynamic_bitsetImSaImEE3setEmb(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %6, i1 noundef zeroext true)
  %8 = add nuw i64 %.05, 1
  %exitcond.not = icmp eq i64 %8, %2
  br i1 %exitcond.not, label %._crit_edge, label %5, !llvm.loop !5
}

; Function Attrs: mustprogress uwtable
declare dso_local noundef nonnull align 8 dereferenceable(32) ptr @_ZN5boost14dynamic_bitsetImSaImEE3setEmb(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef, i1 noundef zeroext) local_unnamed_addr #0 align 2

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" }

!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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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