; LLVM IR from Water-Melon/Melon :: src (mln_span)

; 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.mln_span_stack_node_s = type { ptr, ptr }

@__mln_span_stack_top = external dso_local global ptr, align 8
@__mln_span_stack_bottom = external dso_local global ptr, align 8

; Function Attrs: nounwind uwtable
define dso_local void @mln_span_stack_free() #0 {
  %1 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #2
  br label %2

2:                                                ; preds = %14, %0
  %3 = load ptr, ptr @__mln_span_stack_top, align 8, !tbaa !5
  store ptr %3, ptr %1, align 8, !tbaa !5
  %4 = icmp ne ptr %3, null
  br i1 %4, label %5, label %16

5:                                                ; preds = %2
  %6 = load ptr, ptr @__mln_span_stack_bottom, align 8, !tbaa !5
  %7 = load ptr, ptr @__mln_span_stack_top, align 8, !tbaa !5
  %8 = icmp eq ptr %6, %7
  br i1 %8, label %9, label %10

9:                                                ; preds = %5
  store ptr null, ptr @__mln_span_stack_bottom, align 8, !tbaa !5
  store ptr null, ptr @__mln_span_stack_top, align 8, !tbaa !5
  br label %14

10:                                               ; preds = %5
  %11 = load ptr, ptr %1, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.mln_span_stack_node_s, ptr %11, i32 0, i32 1
  %13 = load ptr, ptr %12, align 8, !tbaa !9
  store ptr %13, ptr @__mln_span_stack_top, align 8, !tbaa !5
  br label %14

14:                                               ; preds = %10, %9
  %15 = load ptr, ptr %1, align 8, !tbaa !5
  call void @mln_span_stack_node_free(ptr noundef %15)
  br label %2, !llvm.loop !11

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

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

; Function Attrs: nounwind uwtable
declare hidden void @mln_span_stack_node_free(ptr noundef) #0

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

attributes #0 = { 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/C++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"mln_span_stack_node_s", !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"

@__mln_span_stack_top = external dso_local local_unnamed_addr global ptr, align 8
@__mln_span_stack_bottom = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: nounwind uwtable
define dso_local void @mln_span_stack_free() local_unnamed_addr #0 {
  %1 = load ptr, ptr @__mln_span_stack_top, align 8, !tbaa !5
  %.not2 = icmp eq ptr %1, null
  br i1 %.not2, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %9
  %2 = phi ptr [ %10, %9 ], [ %1, %0 ]
  %3 = load ptr, ptr @__mln_span_stack_bottom, align 8, !tbaa !5
  %4 = icmp eq ptr %3, %2
  br i1 %4, label %5, label %6

5:                                                ; preds = %.lr.ph
  store ptr null, ptr @__mln_span_stack_bottom, align 8, !tbaa !5
  br label %9

6:                                                ; preds = %.lr.ph
  %7 = getelementptr inbounds i8, ptr %2, i64 8
  %8 = load ptr, ptr %7, align 8, !tbaa !9
  br label %9

9:                                                ; preds = %6, %5
  %storemerge = phi ptr [ %8, %6 ], [ null, %5 ]
  store ptr %storemerge, ptr @__mln_span_stack_top, align 8, !tbaa !5
  tail call void @mln_span_stack_node_free(ptr noundef nonnull %2)
  %10 = load ptr, ptr @__mln_span_stack_top, align 8, !tbaa !5
  %.not = icmp eq ptr %10, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !11

._crit_edge:                                      ; preds = %9, %0
  ret void
}

; Function Attrs: nounwind uwtable
declare hidden void @mln_span_stack_node_free(ptr noundef) local_unnamed_addr #0

attributes #0 = { 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" }

!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/C++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"mln_span_stack_node_s", !6, i64 0, !6, i64 8}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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