; LLVM IR from brewlin/garbage-collect :: gc-golang/central (central)

; 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.mcentral = type { %union.pthread_mutex_t, i8, %struct.mspanlist, %struct.mspanlist, i64 }
%union.pthread_mutex_t = type { %struct.__pthread_mutex_s }
%struct.__pthread_mutex_s = type { i32, i32, i32, i32, i32, i16, i16, %struct.__pthread_internal_list }
%struct.__pthread_internal_list = type { ptr, ptr }
%struct.mspanlist = type { ptr, ptr }

; Function Attrs: nounwind uwtable
define dso_local void @central_init(ptr noundef %0, i8 noundef zeroext %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i8, align 1
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i8 %1, ptr %4, align 1, !tbaa !9
  %5 = load i8, ptr %4, align 1, !tbaa !9
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = getelementptr inbounds %struct.mcentral, ptr %6, i32 0, i32 1
  store i8 %5, ptr %7, align 8, !tbaa !10
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.mcentral, ptr %8, i32 0, i32 3
  %10 = getelementptr inbounds %struct.mspanlist, ptr %9, i32 0, i32 0
  store ptr null, ptr %10, align 8, !tbaa !14
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.mcentral, ptr %11, i32 0, i32 3
  %13 = getelementptr inbounds %struct.mspanlist, ptr %12, i32 0, i32 1
  store ptr null, ptr %13, align 8, !tbaa !15
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.mcentral, ptr %14, i32 0, i32 2
  %16 = getelementptr inbounds %struct.mspanlist, ptr %15, i32 0, i32 0
  store ptr null, ptr %16, align 8, !tbaa !16
  %17 = load ptr, ptr %3, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.mcentral, ptr %17, i32 0, i32 2
  %19 = getelementptr inbounds %struct.mspanlist, ptr %18, i32 0, i32 1
  store ptr null, ptr %19, align 8, !tbaa !17
  ret void
}

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 = !{!7, !7, i64 0}
!10 = !{!11, !7, i64 40}
!11 = !{!"mcentral", !7, i64 0, !7, i64 40, !12, i64 48, !12, i64 64, !13, i64 80}
!12 = !{!"mspanlist", !6, i64 0, !6, i64 8}
!13 = !{!"long", !7, i64 0}
!14 = !{!11, !6, i64 64}
!15 = !{!11, !6, i64 72}
!16 = !{!11, !6, i64 48}
!17 = !{!11, !6, i64 56}


; 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 nofree norecurse nosync nounwind willreturn memory(argmem: write) uwtable
define dso_local void @central_init(ptr nocapture noundef writeonly %0, i8 noundef zeroext %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i8, ptr %0, i64 40
  store i8 %1, ptr %3, align 8, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %0, i64 48
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(32) %4, i8 0, i64 32, i1 false)
  ret void
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: write) 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 nounwind willreturn memory(argmem: write) }

!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 40}
!6 = !{!"mcentral", !7, i64 0, !7, i64 40, !9, i64 48, !9, i64 64, !11, i64 80}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!"mspanlist", !10, i64 0, !10, i64 8}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!"long", !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InstCombinePass,MemCpyOptPass,PostOrderFunctionAttrsPass,SROAPass,TailCallElimPass