; LLVM IR from alexzheng42/sDMD :: analysis (HBRamach)

; 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"

@atomnum = external global i32, align 4
@connectionMap = external dso_local global ptr, align 8

; 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: nounwind uwtable
define dso_local i32 @CheckHBConnection(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 1, ptr %4, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %26, %1
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = load i32, ptr @atomnum, align 4, !tbaa !5
  %9 = icmp sle i32 %7, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %6
  store i32 2, ptr %5, align 4
  br label %29

11:                                               ; preds = %6
  %12 = load ptr, ptr @connectionMap, align 8, !tbaa !9
  %13 = load i32, ptr %3, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds ptr, ptr %12, i64 %14
  %16 = load ptr, ptr %15, align 8, !tbaa !9
  %17 = load i32, ptr %4, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds i32, ptr %16, i64 %18
  %20 = load i32, ptr %19, align 4, !tbaa !5
  %21 = and i32 %20, 4
  %22 = icmp ne i32 %21, 0
  br i1 %22, label %23, label %25

23:                                               ; preds = %11
  %24 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %24, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %29

25:                                               ; preds = %11
  br label %26

26:                                               ; preds = %25
  %27 = load i32, ptr %4, align 4, !tbaa !5
  %28 = add nsw i32 %27, 1
  store i32 %28, ptr %4, align 4, !tbaa !5
  br label %6, !llvm.loop !11

29:                                               ; preds = %23, %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %30 = load i32, ptr %5, align 4
  switch i32 %30, label %34 [
    i32 2, label %31
    i32 1, label %32
  ]

31:                                               ; preds = %29
  store i32 0, ptr %2, align 4
  br label %32

32:                                               ; preds = %31, %29
  %33 = load i32, ptr %2, align 4
  ret i32 %33

34:                                               ; preds = %29
  unreachable
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!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"

@atomnum = external local_unnamed_addr global i32, align 4
@connectionMap = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local i32 @CheckHBConnection(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @atomnum, align 4, !tbaa !5
  %.not10 = icmp slt i32 %2, 1
  br i1 %.not10, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1
  %3 = load ptr, ptr @connectionMap, align 8, !tbaa !9
  %4 = sext i32 %0 to i64
  %5 = getelementptr inbounds ptr, ptr %3, i64 %4
  %6 = load ptr, ptr %5, align 8, !tbaa !9
  %7 = add nuw i32 %2, 1
  %wide.trip.count = zext i32 %7 to i64
  br label %8

8:                                                ; preds = %.lr.ph, %12
  %indvars.iv = phi i64 [ 1, %.lr.ph ], [ %indvars.iv.next, %12 ]
  %9 = getelementptr inbounds i32, ptr %6, i64 %indvars.iv
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = and i32 %10, 4
  %.not9 = icmp eq i32 %11, 0
  br i1 %.not9, label %12, label %._crit_edge.loopexit.split.loop.exit

12:                                               ; preds = %8
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %8, !llvm.loop !11

._crit_edge.loopexit.split.loop.exit:             ; preds = %8
  %13 = trunc nuw nsw i64 %indvars.iv to i32
  br label %._crit_edge

._crit_edge:                                      ; preds = %12, %._crit_edge.loopexit.split.loop.exit, %1
  %spec.select = phi i32 [ 0, %1 ], [ %13, %._crit_edge.loopexit.split.loop.exit ], [ 0, %12 ]
  ret i32 %spec.select
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass