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

; 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"

@.str.4 = external hidden unnamed_addr constant [16 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local ptr @make_shared() #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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

; Function Attrs: nounwind uwtable
declare dso_local ptr @reader_entry(ptr noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local ptr @writer_entry(ptr noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local i64 @make_thread(ptr noundef, ptr noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local void @join_thread(i64 noundef) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca [3 x i64], align 16
  %3 = alloca [3 x i64], align 16
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 24, ptr %2) #3
  call void @llvm.lifetime.start.p0(i64 24, ptr %3) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %9 = call ptr @make_shared()
  store ptr %9, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %20, %0
  %11 = load i32, ptr %5, align 4, !tbaa !9
  %12 = icmp slt i32 %11, 3
  br i1 %12, label %14, label %13

13:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  br label %23

14:                                               ; preds = %10
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = call i64 @make_thread(ptr noundef @reader_entry, ptr noundef %15)
  %17 = load i32, ptr %5, align 4, !tbaa !9
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [3 x i64], ptr %2, i64 0, i64 %18
  store i64 %16, ptr %19, align 8, !tbaa !11
  br label %20

20:                                               ; preds = %14
  %21 = load i32, ptr %5, align 4, !tbaa !9
  %22 = add nsw i32 %21, 1
  store i32 %22, ptr %5, align 4, !tbaa !9
  br label %10, !llvm.loop !13

23:                                               ; preds = %13
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %24

24:                                               ; preds = %34, %23
  %25 = load i32, ptr %6, align 4, !tbaa !9
  %26 = icmp slt i32 %25, 3
  br i1 %26, label %28, label %27

27:                                               ; preds = %24
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  br label %37

28:                                               ; preds = %24
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = call i64 @make_thread(ptr noundef @writer_entry, ptr noundef %29)
  %31 = load i32, ptr %6, align 4, !tbaa !9
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds [3 x i64], ptr %3, i64 0, i64 %32
  store i64 %30, ptr %33, align 8, !tbaa !11
  br label %34

34:                                               ; preds = %28
  %35 = load i32, ptr %6, align 4, !tbaa !9
  %36 = add nsw i32 %35, 1
  store i32 %36, ptr %6, align 4, !tbaa !9
  br label %24, !llvm.loop !15

37:                                               ; preds = %27
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %38

38:                                               ; preds = %47, %37
  %39 = load i32, ptr %7, align 4, !tbaa !9
  %40 = icmp slt i32 %39, 3
  br i1 %40, label %42, label %41

41:                                               ; preds = %38
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  br label %50

42:                                               ; preds = %38
  %43 = load i32, ptr %7, align 4, !tbaa !9
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds [3 x i64], ptr %2, i64 0, i64 %44
  %46 = load i64, ptr %45, align 8, !tbaa !11
  call void @join_thread(i64 noundef %46)
  br label %47

47:                                               ; preds = %42
  %48 = load i32, ptr %7, align 4, !tbaa !9
  %49 = add nsw i32 %48, 1
  store i32 %49, ptr %7, align 4, !tbaa !9
  br label %38, !llvm.loop !16

50:                                               ; preds = %41
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  store i32 0, ptr %8, align 4, !tbaa !9
  br label %51

51:                                               ; preds = %60, %50
  %52 = load i32, ptr %8, align 4, !tbaa !9
  %53 = icmp slt i32 %52, 3
  br i1 %53, label %55, label %54

54:                                               ; preds = %51
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  br label %63

55:                                               ; preds = %51
  %56 = load i32, ptr %8, align 4, !tbaa !9
  %57 = sext i32 %56 to i64
  %58 = getelementptr inbounds [3 x i64], ptr %3, i64 0, i64 %57
  %59 = load i64, ptr %58, align 8, !tbaa !11
  call void @join_thread(i64 noundef %59)
  br label %60

60:                                               ; preds = %55
  %61 = load i32, ptr %8, align 4, !tbaa !9
  %62 = add nsw i32 %61, 1
  store i32 %62, ptr %8, align 4, !tbaa !9
  br label %51, !llvm.loop !17

63:                                               ; preds = %54
  %64 = call i32 (ptr, ...) @printf(ptr noundef @.str.4)
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 24, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 24, ptr %2) #3
  ret i32 0
}

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = distinct !{!15, !14}
!16 = distinct !{!16, !14}
!17 = distinct !{!17, !14}


; 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.4 = external hidden unnamed_addr constant [16 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local ptr @make_shared() local_unnamed_addr #0

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

; Function Attrs: nounwind uwtable
declare dso_local ptr @reader_entry(ptr noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local ptr @writer_entry(ptr noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local i64 @make_thread(ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @join_thread(i64 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
.preheader17.preheader:
  %0 = tail call ptr @make_shared()
  %1 = tail call i64 @make_thread(ptr noundef nonnull @reader_entry, ptr noundef %0)
  %2 = tail call i64 @make_thread(ptr noundef nonnull @reader_entry, ptr noundef %0)
  %3 = tail call i64 @make_thread(ptr noundef nonnull @reader_entry, ptr noundef %0)
  %4 = tail call i64 @make_thread(ptr noundef nonnull @writer_entry, ptr noundef %0)
  %5 = tail call i64 @make_thread(ptr noundef nonnull @writer_entry, ptr noundef %0)
  %6 = tail call i64 @make_thread(ptr noundef nonnull @writer_entry, ptr noundef %0)
  tail call void @join_thread(i64 noundef %1)
  tail call void @join_thread(i64 noundef %2)
  tail call void @join_thread(i64 noundef %3)
  tail call void @join_thread(i64 noundef %4)
  tail call void @join_thread(i64 noundef %5)
  tail call void @join_thread(i64 noundef %6)
  %7 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.4)
  ret i32 0
}

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)"}


; Effective O3 passes: GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,LoopSimplifyPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass