; LLVM IR from jrouwe/JoltPhysics :: Jolt/Physics/IslandBuilder.ll (ZNK3JPH13IslandBuilder18GetLowestBodyIndexEj)

; 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.JPH::IslandBuilder" = type { ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, i32, i32, i32, i32, i32, i32 }
%"struct.JPH::IslandBuilder::BodyLink" = type { %"struct.std::atomic", i32 }
%"struct.std::atomic" = type { %"struct.std::__atomic_base" }
%"struct.std::__atomic_base" = type { i32 }

; 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 nounwind uwtable
define dso_local noundef i32 @_ZNK3JPH13IslandBuilder18GetLowestBodyIndexEj(ptr noundef nonnull align 8 dereferenceable(112) %0, i32 noundef %1) #1 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  %8 = load ptr, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  %9 = load i32, ptr %4, align 4, !tbaa !9
  store i32 %9, ptr %5, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %26, %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %11 = getelementptr inbounds %"class.JPH::IslandBuilder", ptr %8, i32 0, i32 0
  %12 = load ptr, ptr %11, align 8, !tbaa !11
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = zext i32 %13 to i64
  %15 = getelementptr inbounds %"struct.JPH::IslandBuilder::BodyLink", ptr %12, i64 %14
  %16 = getelementptr inbounds %"struct.JPH::IslandBuilder::BodyLink", ptr %15, i32 0, i32 0
  %17 = call noundef i32 @_ZNKSt13__atomic_baseIjE4loadESt12memory_order(ptr noundef nonnull align 4 dereferenceable(4) %16, i32 noundef 0) #3
  store i32 %17, ptr %6, align 4, !tbaa !9
  %18 = load i32, ptr %6, align 4, !tbaa !9
  %19 = load i32, ptr %5, align 4, !tbaa !9
  %20 = icmp eq i32 %18, %19
  br i1 %20, label %21, label %22

21:                                               ; preds = %10
  store i32 2, ptr %7, align 4
  br label %24

22:                                               ; preds = %10
  %23 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %23, ptr %5, align 4, !tbaa !9
  store i32 0, ptr %7, align 4
  br label %24

24:                                               ; preds = %22, %21
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  %25 = load i32, ptr %7, align 4
  switch i32 %25, label %29 [
    i32 0, label %26
    i32 2, label %27
  ]

26:                                               ; preds = %24
  br label %10, !llvm.loop !13

27:                                               ; preds = %24
  %28 = load i32, ptr %5, align 4, !tbaa !9
  store i32 1, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret i32 %28

29:                                               ; preds = %24
  unreachable
}

; Function Attrs: alwaysinline mustprogress nounwind uwtable
declare dso_local noundef i32 @_ZNKSt13__atomic_baseIjE4loadESt12memory_order(ptr noundef nonnull align 4 dereferenceable(4), i32 noundef) #2 align 2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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" }
attributes #2 = { alwaysinline 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 #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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"_ZTSN3JPH13IslandBuilderE", !6, i64 0, !6, i64 8, !6, i64 16, !6, i64 24, !6, i64 32, !6, i64 40, !6, i64 48, !6, i64 56, !6, i64 64, !6, i64 72, !6, i64 80, !10, i64 88, !10, i64 92, !10, i64 96, !10, i64 100, !10, i64 104, !10, i64 108}
!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"

%"struct.JPH::IslandBuilder::BodyLink" = type { %"struct.std::atomic", i32 }
%"struct.std::atomic" = type { %"struct.std::__atomic_base" }
%"struct.std::__atomic_base" = type { i32 }

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_ZNK3JPH13IslandBuilder18GetLowestBodyIndexEj(ptr nocapture noundef nonnull readonly align 8 dereferenceable(112) %0, i32 noundef %1) local_unnamed_addr #0 align 2 {
  br label %3

3:                                                ; preds = %3, %2
  %.07 = phi i32 [ %1, %2 ], [ %7, %3 ]
  %4 = load ptr, ptr %0, align 8, !tbaa !5
  %5 = zext i32 %.07 to i64
  %6 = getelementptr inbounds %"struct.JPH::IslandBuilder::BodyLink", ptr %4, i64 %5
  %7 = tail call noundef i32 @_ZNKSt13__atomic_baseIjE4loadESt12memory_order(ptr noundef nonnull align 4 dereferenceable(4) %6, i32 noundef 0) #2
  %8 = icmp eq i32 %7, %.07
  br i1 %8, label %9, label %3

9:                                                ; preds = %3
  ret i32 %.07
}

; Function Attrs: alwaysinline mustprogress nounwind uwtable
declare dso_local noundef i32 @_ZNKSt13__atomic_baseIjE4loadESt12memory_order(ptr noundef nonnull align 4 dereferenceable(4), i32 noundef) local_unnamed_addr #1 align 2

attributes #0 = { 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 = { alwaysinline 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 = { 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, !7, i64 0}
!6 = !{!"_ZTSN3JPH13IslandBuilderE", !7, i64 0, !7, i64 8, !7, i64 16, !7, i64 24, !7, i64 32, !7, i64 40, !7, i64 48, !7, i64 56, !7, i64 64, !7, i64 72, !7, i64 80, !10, i64 88, !10, i64 92, !10, i64 96, !10, i64 100, !10, i64 104, !10, i64 108}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"int", !8, i64 0}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass