; 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"

; 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 ptr @make_shared(i32 noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local i64 @make_thread(ptr noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local void @join_thread(i64 noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local ptr @entry(ptr noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local void @check_array(ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @main() #1 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca [2 x i64], align 16
  %4 = alloca ptr, align 8
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #2
  call void @llvm.lifetime.start.p0(i64 16, ptr %3) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %5 = call ptr @make_shared(i32 noundef 1000000)
  store ptr %5, ptr %4, align 8, !tbaa !5
  store i32 0, ptr %2, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %15, %0
  %7 = load i32, ptr %2, align 4, !tbaa !9
  %8 = icmp slt i32 %7, 2
  br i1 %8, label %9, label %18

9:                                                ; preds = %6
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = call i64 @make_thread(ptr noundef @entry, ptr noundef %10)
  %12 = load i32, ptr %2, align 4, !tbaa !9
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [2 x i64], ptr %3, i64 0, i64 %13
  store i64 %11, ptr %14, align 8, !tbaa !11
  br label %15

15:                                               ; preds = %9
  %16 = load i32, ptr %2, align 4, !tbaa !9
  %17 = add nsw i32 %16, 1
  store i32 %17, ptr %2, align 4, !tbaa !9
  br label %6, !llvm.loop !13

18:                                               ; preds = %6
  store i32 0, ptr %2, align 4, !tbaa !9
  br label %19

19:                                               ; preds = %27, %18
  %20 = load i32, ptr %2, align 4, !tbaa !9
  %21 = icmp slt i32 %20, 2
  br i1 %21, label %22, label %30

22:                                               ; preds = %19
  %23 = load i32, ptr %2, align 4, !tbaa !9
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [2 x i64], ptr %3, i64 0, i64 %24
  %26 = load i64, ptr %25, align 8, !tbaa !11
  call void @join_thread(i64 noundef %26)
  br label %27

27:                                               ; preds = %22
  %28 = load i32, ptr %2, align 4, !tbaa !9
  %29 = add nsw i32 %28, 1
  store i32 %29, ptr %2, align 4, !tbaa !9
  br label %19, !llvm.loop !15

30:                                               ; preds = %19
  %31 = load ptr, ptr %4, align 8, !tbaa !5
  call void @check_array(ptr noundef %31)
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 16, ptr %3) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #2
  ret i32 0
}

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 = !{!"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}


; 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: nounwind uwtable
declare dso_local ptr @make_shared(i32 noundef) local_unnamed_addr #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
declare dso_local ptr @entry(ptr noundef) #0

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

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
.preheader.preheader:
  %0 = tail call ptr @make_shared(i32 noundef 1000000)
  %1 = tail call i64 @make_thread(ptr noundef nonnull @entry, ptr noundef %0)
  %2 = tail call i64 @make_thread(ptr noundef nonnull @entry, ptr noundef %0)
  tail call void @join_thread(i64 noundef %1)
  tail call void @join_thread(i64 noundef %2)
  tail call void @check_array(ptr noundef %0)
  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" }

!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,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,LoopSimplifyPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass