; 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_pop_back = external hidden unnamed_addr constant [11 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 zeroext i1 @b_pop_back(ptr noundef %0) #0 {
  %2 = alloca i1, align 1
  %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 %20

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
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.buffer, ptr %10, i32 0, i32 5
  %12 = load ptr, ptr %11, align 8, !tbaa !13
  %13 = icmp ne ptr %12, null
  br i1 %13, label %14, label %19

14:                                               ; preds = %7
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.buffer, ptr %15, i32 0, i32 5
  %17 = load ptr, ptr %16, align 8, !tbaa !13
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  call void %17(ptr noundef @__func__.b_pop_back, ptr noundef %18)
  br label %19

19:                                               ; preds = %14, %7
  store i1 false, ptr %2, align 1
  br label %41

20:                                               ; preds = %1
  store i32 0, ptr %4, align 4, !tbaa !14
  %21 = load i32, ptr %4, align 4, !tbaa !14
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.buffer, ptr %22, i32 0, i32 0
  %24 = load ptr, ptr %3, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.buffer, ptr %24, i32 0, i32 1
  %26 = load i64, ptr %25, align 8, !tbaa !15
  %27 = add i64 %26, -1
  store i64 %27, ptr %25, align 8, !tbaa !15
  %28 = getelementptr inbounds [100 x i32], ptr %23, i64 0, i64 %27
  store i32 %21, ptr %28, align 4, !tbaa !14
  %29 = load ptr, ptr %3, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.buffer, ptr %29, i32 0, i32 2
  store i32 0, ptr %30, align 8, !tbaa !9
  %31 = load ptr, ptr %3, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.buffer, ptr %31, i32 0, i32 5
  %33 = load ptr, ptr %32, align 8, !tbaa !13
  %34 = icmp ne ptr %33, null
  br i1 %34, label %35, label %40

35:                                               ; preds = %20
  %36 = load ptr, ptr %3, align 8, !tbaa !5
  %37 = getelementptr inbounds %struct.buffer, ptr %36, i32 0, i32 5
  %38 = load ptr, ptr %37, align 8, !tbaa !13
  %39 = load ptr, ptr %3, align 8, !tbaa !5
  call void %38(ptr noundef @__func__.b_pop_back, ptr noundef %39)
  br label %40

40:                                               ; preds = %35, %20
  store i1 true, ptr %2, align 1
  br label %41

41:                                               ; preds = %40, %19
  %42 = load i1, ptr %2, align 1
  ret i1 %42
}

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 = !{!10, !6, i64 432}
!14 = !{!12, !12, i64 0}
!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_pop_back = external hidden unnamed_addr constant [11 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 noundef zeroext i1 @b_pop_back(ptr noundef %0) local_unnamed_addr #0 {
  %2 = tail call zeroext i1 @b_empty(ptr noundef %0)
  br i1 %2, label %3, label %7

3:                                                ; preds = %1
  %4 = getelementptr inbounds i8, ptr %0, i64 408
  store i32 2, ptr %4, align 8, !tbaa !5
  %5 = getelementptr inbounds i8, ptr %0, i64 432
  %6 = load ptr, ptr %5, align 8, !tbaa !12
  %.not14 = icmp eq ptr %6, null
  br i1 %.not14, label %15, label %.sink.split

7:                                                ; preds = %1
  %8 = getelementptr inbounds i8, ptr %0, i64 400
  %9 = load i64, ptr %8, align 8, !tbaa !13
  %10 = add i64 %9, -1
  store i64 %10, ptr %8, align 8, !tbaa !13
  %11 = getelementptr inbounds [100 x i32], ptr %0, i64 0, i64 %10
  store i32 0, ptr %11, align 4, !tbaa !14
  %12 = getelementptr inbounds i8, ptr %0, i64 408
  store i32 0, ptr %12, align 8, !tbaa !5
  %13 = getelementptr inbounds i8, ptr %0, i64 432
  %14 = load ptr, ptr %13, align 8, !tbaa !12
  %.not = icmp eq ptr %14, null
  br i1 %.not, label %15, label %.sink.split

.sink.split:                                      ; preds = %7, %3
  %.sink = phi ptr [ %6, %3 ], [ %14, %7 ]
  tail call void %.sink(ptr noundef nonnull @__func__.b_pop_back, ptr noundef nonnull %0) #1
  br label %15

15:                                               ; preds = %.sink.split, %7, %3
  %.0 = xor i1 %2, true
  ret i1 %.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,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass