; LLVM IR from AllenDowney/ExercisesInC :: exercises/ex12 (counter_array)

; 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.Shared = type { i32, i32, ptr }

@.str.3 = external hidden unnamed_addr constant [30 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [4 x i8], align 1

; 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
declare dso_local void @perform_task(i32 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @child_code(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  %4 = load ptr, ptr %2, align 8, !tbaa !5
  %5 = getelementptr inbounds %struct.Shared, ptr %4, i32 0, i32 0
  %6 = load i32, ptr %5, align 8, !tbaa !9
  %7 = call i32 (ptr, ...) @printf(ptr noundef @.str.3, i32 noundef %6)
  br label %8

8:                                                ; preds = %41, %1
  %9 = load ptr, ptr %2, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.Shared, ptr %9, i32 0, i32 0
  %11 = load i32, ptr %10, align 8, !tbaa !9
  %12 = load ptr, ptr %2, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.Shared, ptr %12, i32 0, i32 1
  %14 = load i32, ptr %13, align 4, !tbaa !12
  %15 = icmp sge i32 %11, %14
  br i1 %15, label %16, label %17

16:                                               ; preds = %8
  ret void

17:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  %18 = load ptr, ptr %2, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.Shared, ptr %18, i32 0, i32 0
  %20 = load i32, ptr %19, align 8, !tbaa !9
  store i32 %20, ptr %3, align 4, !tbaa !13
  %21 = load ptr, ptr %2, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.Shared, ptr %21, i32 0, i32 2
  %23 = load ptr, ptr %22, align 8, !tbaa !14
  %24 = load ptr, ptr %2, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.Shared, ptr %24, i32 0, i32 0
  %26 = load i32, ptr %25, align 8, !tbaa !9
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds i32, ptr %23, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !13
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %28, align 4, !tbaa !13
  %31 = load ptr, ptr %2, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.Shared, ptr %31, i32 0, i32 0
  %33 = load i32, ptr %32, align 8, !tbaa !9
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %32, align 8, !tbaa !9
  %35 = load i32, ptr %3, align 4, !tbaa !13
  %36 = srem i32 %35, 10000
  %37 = icmp eq i32 %36, 0
  br i1 %37, label %38, label %41

38:                                               ; preds = %17
  %39 = load i32, ptr %3, align 4, !tbaa !13
  %40 = call i32 (ptr, ...) @printf(ptr noundef @.str.4, i32 noundef %39)
  br label %41

41:                                               ; preds = %38, %17
  %42 = load i32, ptr %3, align 4, !tbaa !13
  call void @perform_task(i32 noundef %42)
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %8
}

declare i32 @printf(ptr noundef, ...) #2

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 = { "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/C++ TBAA"}
!9 = !{!10, !11, i64 0}
!10 = !{!"", !11, i64 0, !11, i64 4, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !11, i64 4}
!13 = !{!11, !11, i64 0}
!14 = !{!10, !6, i64 8}


; 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"

@.str.3 = external hidden unnamed_addr constant [30 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local void @perform_task(i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @child_code(ptr nocapture noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr %0, align 8, !tbaa !5
  %3 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.3, i32 noundef %2)
  %4 = getelementptr inbounds i8, ptr %0, i64 4
  %5 = load i32, ptr %0, align 8, !tbaa !5
  %6 = load i32, ptr %4, align 4, !tbaa !11
  %.not9 = icmp slt i32 %5, %6
  br i1 %.not9, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %1
  %7 = getelementptr inbounds i8, ptr %0, i64 8
  br label %8

._crit_edge:                                      ; preds = %21, %1
  ret void

8:                                                ; preds = %.lr.ph, %21
  %9 = phi i32 [ %5, %.lr.ph ], [ %22, %21 ]
  %10 = load ptr, ptr %7, align 8, !tbaa !12
  %11 = sext i32 %9 to i64
  %12 = getelementptr inbounds i32, ptr %10, i64 %11
  %13 = load i32, ptr %12, align 4, !tbaa !13
  %14 = add nsw i32 %13, 1
  store i32 %14, ptr %12, align 4, !tbaa !13
  %15 = load i32, ptr %0, align 8, !tbaa !5
  %16 = add nsw i32 %15, 1
  store i32 %16, ptr %0, align 8, !tbaa !5
  %17 = srem i32 %9, 10000
  %18 = icmp eq i32 %17, 0
  br i1 %18, label %19, label %21

19:                                               ; preds = %8
  %20 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.4, i32 noundef %9)
  br label %21

21:                                               ; preds = %19, %8
  tail call void @perform_task(i32 noundef %9)
  %22 = load i32, ptr %0, align 8, !tbaa !5
  %23 = load i32, ptr %4, align 4, !tbaa !11
  %.not = icmp slt i32 %22, %23
  br i1 %.not, label %8, label %._crit_edge
}

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

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 = { nofree 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" }

!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 = !{!"", !7, i64 0, !7, i64 4, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !7, i64 4}
!12 = !{!6, !10, i64 8}
!13 = !{!7, !7, i64 0}


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