; LLVM IR from LeoVen/C-Macro-Collections :: examples (callbacks)

; 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.buffer = type { [100 x i32], i64, i32, ptr, ptr, ptr }

@__func__.b_back = external hidden unnamed_addr constant [7 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local zeroext i1 @b_empty(ptr noundef) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @b_back(ptr noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  %5 = load ptr, ptr %3, align 8, !tbaa !5
  %6 = call zeroext i1 @b_empty(ptr noundef %5)
  br i1 %6, label %7, label %11

7:                                                ; preds = %1
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.buffer, ptr %8, i32 0, i32 2
  store i32 2, ptr %9, align 8, !tbaa !9
  store i32 0, ptr %4, align 4, !tbaa !13
  %10 = load i32, ptr %4, align 4, !tbaa !13
  store i32 %10, ptr %2, align 4
  br label %32

11:                                               ; preds = %1
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.buffer, ptr %12, i32 0, i32 2
  store i32 0, ptr %13, align 8, !tbaa !9
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.buffer, ptr %14, i32 0, i32 5
  %16 = load ptr, ptr %15, align 8, !tbaa !14
  %17 = icmp ne ptr %16, null
  br i1 %17, label %18, label %23

18:                                               ; preds = %11
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.buffer, ptr %19, i32 0, i32 5
  %21 = load ptr, ptr %20, align 8, !tbaa !14
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  call void %21(ptr noundef @__func__.b_back, ptr noundef %22)
  br label %23

23:                                               ; preds = %18, %11
  %24 = load ptr, ptr %3, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.buffer, ptr %24, i32 0, i32 0
  %26 = load ptr, ptr %3, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.buffer, ptr %26, i32 0, i32 1
  %28 = load i64, ptr %27, align 8, !tbaa !15
  %29 = sub i64 %28, 1
  %30 = getelementptr inbounds [100 x i32], ptr %25, i64 0, i64 %29
  %31 = load i32, ptr %30, align 4, !tbaa !13
  store i32 %31, ptr %2, align 4
  br label %32

32:                                               ; preds = %23, %7
  %33 = load i32, ptr %2, align 4
  ret i32 %33
}

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)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !12, i64 408}
!10 = !{!"buffer", !7, i64 0, !11, i64 400, !12, i64 408, !6, i64 416, !6, i64 424, !6, i64 432}
!11 = !{!"long", !7, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!12, !12, i64 0}
!14 = !{!10, !6, i64 432}
!15 = !{!10, !11, i64 400}


; 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"

@__func__.b_back = external hidden unnamed_addr constant [7 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local zeroext i1 @b_empty(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local i32 @b_back(ptr noundef %0) local_unnamed_addr #0 {
  %2 = tail call zeroext i1 @b_empty(ptr noundef %0)
  %3 = getelementptr inbounds i8, ptr %0, i64 408
  br i1 %2, label %4, label %5

4:                                                ; preds = %1
  store i32 2, ptr %3, align 8, !tbaa !5
  br label %15

5:                                                ; preds = %1
  store i32 0, ptr %3, align 8, !tbaa !5
  %6 = getelementptr inbounds i8, ptr %0, i64 432
  %7 = load ptr, ptr %6, align 8, !tbaa !12
  %.not = icmp eq ptr %7, null
  br i1 %.not, label %9, label %8

8:                                                ; preds = %5
  tail call void %7(ptr noundef nonnull @__func__.b_back, ptr noundef nonnull %0) #1
  br label %9

9:                                                ; preds = %8, %5
  %10 = getelementptr inbounds i8, ptr %0, i64 400
  %11 = load i64, ptr %10, align 8, !tbaa !13
  %12 = add i64 %11, -1
  %13 = getelementptr inbounds [100 x i32], ptr %0, i64 0, i64 %12
  %14 = load i32, ptr %13, align 4, !tbaa !14
  br label %15

15:                                               ; preds = %9, %4
  %.0 = phi i32 [ 0, %4 ], [ %14, %9 ]
  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 = { 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, !10, i64 408}
!6 = !{!"buffer", !7, i64 0, !9, i64 400, !10, i64 408, !11, i64 416, !11, i64 424, !11, i64 432}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!"long", !7, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!"any pointer", !7, i64 0}
!12 = !{!6, !11, i64 432}
!13 = !{!6, !9, i64 400}
!14 = !{!10, !10, i64 0}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InstCombinePass,SROAPass,SimplifyCFGPass,TailCallElimPass