; LLVM IR from thalium/icebox :: third_party/virtualbox/src/VBox/Devices/EFI/Firmware/OptionRomPkg (GetFreeCB)

; 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.s_data_instance = type { i16, i16, i8, i8, i16, i16, i16, i16, i16, [32 x i8], [32 x i8], [32 x i8], [64 x i32], [128 x i32], i32, i32, i16, i16, i8, i8, i8, i8, i16, i16, i16, i16, i32, i32, i16, i16, [2 x i16], i8, i8, i16, i32, ptr, ptr, ptr, ptr, ptr, ptr, i64, i64, i64, i64, i64, [64 x i64], i16, i16, i16, i16, i8, i8, i8, i8, i8, [3 x i8], %struct.mc, i64, ptr, i64, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr, ptr }
%struct.mc = type { [3 x i16], i16, [8 x [32 x i8]] }
%struct.s_TxCB = type { %struct.CB_Header, i32, i16, i8, i8, [64 x i8], [16 x %struct.TBD], i32, i32, ptr, ptr, i64 }
%struct.CB_Header = type { i16, i16, i32 }
%struct.TBD = type { i32, i32 }

; 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 @BlockIt(ptr noundef, i32 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local ptr @GetFreeCB(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = getelementptr inbounds %struct.s_data_instance, ptr %6, i32 0, i32 50
  %8 = load i16, ptr %7, align 2, !tbaa !9
  %9 = zext i16 %8 to i32
  %10 = icmp sle i32 %9, 1
  br i1 %10, label %11, label %14

11:                                               ; preds = %1
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = call zeroext i16 @CheckCBList(ptr noundef %12)
  br label %14

14:                                               ; preds = %11, %1
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.s_data_instance, ptr %15, i32 0, i32 50
  %17 = load i16, ptr %16, align 2, !tbaa !9
  %18 = zext i16 %17 to i32
  %19 = icmp sle i32 %18, 1
  br i1 %19, label %20, label %21

20:                                               ; preds = %14
  store ptr null, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %37

21:                                               ; preds = %14
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  call void @BlockIt(ptr noundef %22, i32 noundef 1)
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.s_data_instance, ptr %23, i32 0, i32 38
  %25 = load ptr, ptr %24, align 8, !tbaa !15
  store ptr %25, ptr %4, align 8, !tbaa !5
  %26 = load ptr, ptr %4, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.s_TxCB, ptr %26, i32 0, i32 9
  %28 = load ptr, ptr %27, align 1, !tbaa !16
  %29 = load ptr, ptr %3, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.s_data_instance, ptr %29, i32 0, i32 38
  store ptr %28, ptr %30, align 8, !tbaa !15
  %31 = load ptr, ptr %3, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.s_data_instance, ptr %31, i32 0, i32 50
  %33 = load i16, ptr %32, align 2, !tbaa !9
  %34 = add i16 %33, -1
  store i16 %34, ptr %32, align 2, !tbaa !9
  %35 = load ptr, ptr %3, align 8, !tbaa !5
  call void @BlockIt(ptr noundef %35, i32 noundef 0)
  %36 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %36, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %37

37:                                               ; preds = %21, %20
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %38 = load ptr, ptr %2, align 8
  ret ptr %38
}

; Function Attrs: nounwind uwtable
declare dso_local zeroext i16 @CheckCBList(ptr noundef) #1

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, !11, i64 1534}
!10 = !{!"s_data_instance", !11, i64 0, !11, i64 2, !7, i64 4, !7, i64 5, !11, i64 6, !11, i64 8, !11, i64 10, !11, i64 12, !11, i64 14, !7, i64 16, !7, i64 48, !7, i64 80, !7, i64 112, !7, i64 368, !12, i64 880, !12, i64 884, !11, i64 888, !11, i64 890, !7, i64 892, !7, i64 893, !7, i64 894, !7, i64 895, !11, i64 896, !11, i64 898, !11, i64 900, !11, i64 902, !12, i64 904, !12, i64 908, !11, i64 912, !11, i64 914, !7, i64 916, !7, i64 920, !7, i64 921, !11, i64 922, !12, i64 924, !6, i64 928, !6, i64 936, !6, i64 944, !6, i64 952, !6, i64 960, !6, i64 968, !13, i64 976, !13, i64 984, !13, i64 992, !13, i64 1000, !13, i64 1008, !7, i64 1016, !11, i64 1528, !11, i64 1530, !11, i64 1532, !11, i64 1534, !7, i64 1536, !7, i64 1537, !7, i64 1538, !7, i64 1539, !7, i64 1540, !7, i64 1541, !14, i64 1544, !13, i64 1808, !6, i64 1816, !13, i64 1824, !6, i64 1832, !6, i64 1840, !6, i64 1848, !6, i64 1856, !6, i64 1864, !6, i64 1872, !6, i64 1880, !6, i64 1888, !6, i64 1896, !6, i64 1904, !6, i64 1912}
!11 = !{!"short", !7, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!"long long", !7, i64 0}
!14 = !{!"mc", !7, i64 0, !11, i64 6, !7, i64 8}
!15 = !{!10, !6, i64 952}
!16 = !{!17, !6, i64 216}
!17 = !{!"s_TxCB", !18, i64 0, !12, i64 8, !11, i64 12, !7, i64 14, !7, i64 15, !7, i64 16, !7, i64 80, !12, i64 208, !12, i64 212, !6, i64 216, !6, i64 224, !13, i64 232}
!18 = !{!"CB_Header", !11, i64 0, !11, i64 2, !12, i64 4}


; 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 void @BlockIt(ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local ptr @GetFreeCB(ptr noundef %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 1534
  %3 = load i16, ptr %2, align 2, !tbaa !5
  %4 = icmp ult i16 %3, 2
  br i1 %4, label %5, label %.thread

5:                                                ; preds = %1
  %6 = tail call zeroext i16 @CheckCBList(ptr noundef nonnull %0)
  %.pr = load i16, ptr %2, align 2, !tbaa !5
  %7 = icmp ult i16 %.pr, 2
  br i1 %7, label %14, label %.thread

.thread:                                          ; preds = %1, %5
  tail call void @BlockIt(ptr noundef nonnull %0, i32 noundef 1)
  %8 = getelementptr inbounds i8, ptr %0, i64 952
  %9 = load ptr, ptr %8, align 8, !tbaa !14
  %10 = getelementptr inbounds i8, ptr %9, i64 216
  %11 = load ptr, ptr %10, align 1, !tbaa !15
  store ptr %11, ptr %8, align 8, !tbaa !14
  %12 = load i16, ptr %2, align 2, !tbaa !5
  %13 = add i16 %12, -1
  store i16 %13, ptr %2, align 2, !tbaa !5
  tail call void @BlockIt(ptr noundef nonnull %0, i32 noundef 0)
  br label %14

14:                                               ; preds = %5, %.thread
  %.0 = phi ptr [ %9, %.thread ], [ null, %5 ]
  ret ptr %.0
}

; Function Attrs: nounwind uwtable
declare dso_local zeroext i16 @CheckCBList(ptr noundef) local_unnamed_addr #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)"}
!5 = !{!6, !7, i64 1534}
!6 = !{!"s_data_instance", !7, i64 0, !7, i64 2, !8, i64 4, !8, i64 5, !7, i64 6, !7, i64 8, !7, i64 10, !7, i64 12, !7, i64 14, !8, i64 16, !8, i64 48, !8, i64 80, !8, i64 112, !8, i64 368, !10, i64 880, !10, i64 884, !7, i64 888, !7, i64 890, !8, i64 892, !8, i64 893, !8, i64 894, !8, i64 895, !7, i64 896, !7, i64 898, !7, i64 900, !7, i64 902, !10, i64 904, !10, i64 908, !7, i64 912, !7, i64 914, !8, i64 916, !8, i64 920, !8, i64 921, !7, i64 922, !10, i64 924, !11, i64 928, !11, i64 936, !11, i64 944, !11, i64 952, !11, i64 960, !11, i64 968, !12, i64 976, !12, i64 984, !12, i64 992, !12, i64 1000, !12, i64 1008, !8, i64 1016, !7, i64 1528, !7, i64 1530, !7, i64 1532, !7, i64 1534, !8, i64 1536, !8, i64 1537, !8, i64 1538, !8, i64 1539, !8, i64 1540, !8, i64 1541, !13, i64 1544, !12, i64 1808, !11, i64 1816, !12, i64 1824, !11, i64 1832, !11, i64 1840, !11, i64 1848, !11, i64 1856, !11, i64 1864, !11, i64 1872, !11, i64 1880, !11, i64 1888, !11, i64 1896, !11, i64 1904, !11, i64 1912}
!7 = !{!"short", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!"any pointer", !8, i64 0}
!12 = !{!"long long", !8, i64 0}
!13 = !{!"mc", !8, i64 0, !7, i64 6, !8, i64 8}
!14 = !{!6, !11, i64 952}
!15 = !{!16, !11, i64 216}
!16 = !{!"s_TxCB", !17, i64 0, !10, i64 8, !7, i64 12, !8, i64 14, !8, i64 15, !8, i64 16, !8, i64 80, !10, i64 208, !10, i64 212, !11, i64 216, !11, i64 224, !12, i64 232}
!17 = !{!"CB_Header", !7, i64 0, !7, i64 2, !10, i64 4}


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