; LLVM IR from brewlin/garbage-collect :: gc-try (mark_sweep)

; 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"

@sp_start = external dso_local global ptr, align 8
@.str.4 = external hidden unnamed_addr constant [19 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [77 x i8], align 1
@__PRETTY_FUNCTION__.scan_stack = external hidden unnamed_addr constant [18 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local void @gc_mark(ptr noundef) #0

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

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

declare ptr @get_sp(...) #2

; Function Attrs: nounwind uwtable
define dso_local void @scan_stack() #0 {
  %1 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #4
  %2 = call ptr (...) @get_sp()
  store ptr %2, ptr %1, align 8, !tbaa !5
  %3 = load ptr, ptr @sp_start, align 8, !tbaa !5
  %4 = load ptr, ptr %1, align 8, !tbaa !5
  %5 = icmp uge ptr %3, %4
  br i1 %5, label %6, label %7

6:                                                ; preds = %0
  br label %8

7:                                                ; preds = %0
  call void @__assert_fail(ptr noundef @.str.4, ptr noundef @.str.5, i32 noundef 100, ptr noundef @__PRETTY_FUNCTION__.scan_stack) #5
  unreachable

8:                                                ; preds = %6
  br label %9

9:                                                ; preds = %16, %8
  %10 = load ptr, ptr %1, align 8, !tbaa !5
  %11 = load ptr, ptr @sp_start, align 8, !tbaa !5
  %12 = icmp ult ptr %10, %11
  br i1 %12, label %13, label %19

13:                                               ; preds = %9
  %14 = load ptr, ptr %1, align 8, !tbaa !5
  %15 = load ptr, ptr %14, align 8, !tbaa !5
  call void @gc_mark(ptr noundef %15)
  br label %16

16:                                               ; preds = %13
  %17 = load ptr, ptr %1, align 8, !tbaa !5
  %18 = getelementptr inbounds i8, ptr %17, i64 4
  store ptr %18, ptr %1, align 8, !tbaa !5
  br label %9, !llvm.loop !9

19:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #4
  ret void
}

; Function Attrs: noreturn nounwind
declare void @__assert_fail(ptr noundef, ptr noundef, i32 noundef, ptr noundef) #3

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 = { "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 = { noreturn 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 #4 = { nounwind }
attributes #5 = { noreturn 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 = distinct !{!9, !10}
!10 = !{!"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"

@sp_start = external dso_local local_unnamed_addr global ptr, align 8
@.str.4 = external hidden unnamed_addr constant [19 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [77 x i8], align 1
@__PRETTY_FUNCTION__.scan_stack = external hidden unnamed_addr constant [18 x i8], align 1

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

declare ptr @get_sp(...) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local void @scan_stack() local_unnamed_addr #0 {
  %1 = tail call ptr (...) @get_sp() #3
  %2 = load ptr, ptr @sp_start, align 8, !tbaa !5
  %.not = icmp ult ptr %2, %1
  br i1 %.not, label %4, label %.preheader

.preheader:                                       ; preds = %0
  %3 = icmp ult ptr %1, %2
  br i1 %3, label %.lr.ph, label %._crit_edge

4:                                                ; preds = %0
  tail call void @__assert_fail(ptr noundef nonnull @.str.4, ptr noundef nonnull @.str.5, i32 noundef 100, ptr noundef nonnull @__PRETTY_FUNCTION__.scan_stack) #4
  unreachable

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.05 = phi ptr [ %6, %.lr.ph ], [ %1, %.preheader ]
  %5 = load ptr, ptr %.05, align 8, !tbaa !5
  tail call void @gc_mark(ptr noundef %5)
  %6 = getelementptr inbounds i8, ptr %.05, i64 4
  %7 = load ptr, ptr @sp_start, align 8, !tbaa !5
  %8 = icmp ult ptr %6, %7
  br i1 %8, label %.lr.ph, label %._crit_edge, !llvm.loop !9

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

; Function Attrs: noreturn nounwind
declare void @__assert_fail(ptr noundef, ptr noundef, i32 noundef, ptr noundef) local_unnamed_addr #2

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 = { "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 = { noreturn 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 }
attributes #4 = { noreturn 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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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