; LLVM IR from stan-dev/math :: lib/tbb_2020.3/src/tbb (spin_rw_mutex)

; 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.tbb::spin_rw_mutex_v3" = type { i64 }

; 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: inlinehint mustprogress nounwind uwtable
declare hidden noundef i64 @_ZL23__TBB_machine_fetchadd8PVvl(ptr noundef, i64 noundef) #1

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_ZN3tbb16spin_rw_mutex_v327internal_try_acquire_readerEv(ptr noundef nonnull align 8 dereferenceable(8) %0) #2 align 2 {
  %2 = alloca i1, align 1
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  %7 = load ptr, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %8 = getelementptr inbounds %"class.tbb::spin_rw_mutex_v3", ptr %7, i32 0, i32 0
  %9 = load i64, ptr %8, align 8, !tbaa !9
  store i64 %9, ptr %4, align 8, !tbaa !12
  %10 = load i64, ptr %4, align 8, !tbaa !12
  %11 = and i64 %10, 3
  %12 = icmp ne i64 %11, 0
  br i1 %12, label %26, label %13

13:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %14 = getelementptr inbounds %"class.tbb::spin_rw_mutex_v3", ptr %7, i32 0, i32 0
  %15 = call noundef i64 @_ZL23__TBB_machine_fetchadd8PVvl(ptr noundef %14, i64 noundef 4)
  store i64 %15, ptr %5, align 8, !tbaa !12
  %16 = load i64, ptr %5, align 8, !tbaa !12
  %17 = and i64 %16, 1
  %18 = icmp ne i64 %17, 0
  br i1 %18, label %20, label %19

19:                                               ; preds = %13
  store i1 true, ptr %2, align 1
  store i32 1, ptr %6, align 4
  br label %23

20:                                               ; preds = %13
  %21 = getelementptr inbounds %"class.tbb::spin_rw_mutex_v3", ptr %7, i32 0, i32 0
  %22 = call noundef i64 @_ZL23__TBB_machine_fetchadd8PVvl(ptr noundef %21, i64 noundef -4)
  store i32 0, ptr %6, align 4
  br label %23

23:                                               ; preds = %20, %19
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  %24 = load i32, ptr %6, align 4
  switch i32 %24, label %27 [
    i32 0, label %25
  ]

25:                                               ; preds = %23
  br label %26

26:                                               ; preds = %25, %1
  store i1 false, ptr %2, align 1
  store i32 1, ptr %6, align 4
  br label %27

27:                                               ; preds = %26, %23
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  %28 = load i1, ptr %2, align 1
  ret i1 %28
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { inlinehint mustprogress 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 #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, !11, i64 0}
!10 = !{!"_ZTSN3tbb16spin_rw_mutex_v3E", !11, i64 0}
!11 = !{!"long", !7, i64 0}
!12 = !{!11, !11, i64 0}


; 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: inlinehint mustprogress nounwind uwtable
declare hidden noundef i64 @_ZL23__TBB_machine_fetchadd8PVvl(ptr noundef, i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_ZN3tbb16spin_rw_mutex_v327internal_try_acquire_readerEv(ptr noundef nonnull align 8 dereferenceable(8) %0) local_unnamed_addr #1 align 2 {
  %2 = load i64, ptr %0, align 8, !tbaa !5
  %3 = and i64 %2, 3
  %.not = icmp eq i64 %3, 0
  br i1 %.not, label %4, label %.critedge

4:                                                ; preds = %1
  %5 = tail call noundef i64 @_ZL23__TBB_machine_fetchadd8PVvl(ptr noundef nonnull %0, i64 noundef 4)
  %6 = and i64 %5, 1
  %.not5.not = icmp eq i64 %6, 0
  br i1 %.not5.not, label %.critedge, label %7

7:                                                ; preds = %4
  %8 = tail call noundef i64 @_ZL23__TBB_machine_fetchadd8PVvl(ptr noundef nonnull %0, i64 noundef -4)
  br label %.critedge

.critedge:                                        ; preds = %1, %7, %4
  %.1 = phi i1 [ true, %4 ], [ false, %7 ], [ false, %1 ]
  ret i1 %.1
}

attributes #0 = { inlinehint mustprogress 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 = { mustprogress 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, !7, i64 0}
!6 = !{!"_ZTSN3tbb16spin_rw_mutex_v3E", !7, i64 0}
!7 = !{!"long", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}


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